Implement std::string_view as described in http://wg21.link/P0254R1. Reviewed as https://reviews.llvm.org/D21459

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@276238 91177308-0d34-0410-b5e6-96231b3b80d8

include/__string

@@ -0,0 +1,725 @@
+// -*- C++ -*-
+//===-------------------------- __string ----------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___STRING
+#define _LIBCPP___STRING
+
+/*
+    string synopsis
+
+namespace std
+{
+
+template <class charT>
+struct char_traits
+{
+    typedef charT     char_type;
+    typedef ...       int_type;
+    typedef streamoff off_type;
+    typedef streampos pos_type;
+    typedef mbstate_t state_type;
+
+    static void assign(char_type& c1, const char_type& c2) noexcept;
+    static constexpr bool eq(char_type c1, char_type c2) noexcept;
+    static constexpr bool lt(char_type c1, char_type c2) noexcept;
+
+    static int              compare(const char_type* s1, const char_type* s2, size_t n);
+    static size_t           length(const char_type* s);
+    static const char_type* find(const char_type* s, size_t n, const char_type& a);
+    static char_type*       move(char_type* s1, const char_type* s2, size_t n);
+    static char_type*       copy(char_type* s1, const char_type* s2, size_t n);
+    static char_type*       assign(char_type* s, size_t n, char_type a);
+
+    static constexpr int_type  not_eof(int_type c) noexcept;
+    static constexpr char_type to_char_type(int_type c) noexcept;
+    static constexpr int_type  to_int_type(char_type c) noexcept;
+    static constexpr bool      eq_int_type(int_type c1, int_type c2) noexcept;
+    static constexpr int_type  eof() noexcept;
+};
+
+template <> struct char_traits<char>;
+template <> struct char_traits<wchar_t>;
+
+}  // std
+
+*/
+
+#include <__config>
+#include <algorithm>  // for search and min
+#include <cstdio>     // For EOF.
+#include <memory>     // for __murmur2_or_cityhash
+
+#include <__undef_min_max>
+
+#include <__debug>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+// char_traits
+
+template <class _CharT>
+struct _LIBCPP_TYPE_VIS_ONLY char_traits
+{
+    typedef _CharT    char_type;
+    typedef int       int_type;
+    typedef streamoff off_type;
+    typedef streampos pos_type;
+    typedef mbstate_t state_type;
+
+    static inline void assign(char_type& __c1, const char_type& __c2) _NOEXCEPT
+        {__c1 = __c2;}
+    static inline _LIBCPP_CONSTEXPR bool eq(char_type __c1, char_type __c2) _NOEXCEPT
+        {return __c1 == __c2;}
+    static inline _LIBCPP_CONSTEXPR bool lt(char_type __c1, char_type __c2) _NOEXCEPT
+        {return __c1 < __c2;}
+
+    static int              compare(const char_type* __s1, const char_type* __s2, size_t __n);
+    _LIBCPP_INLINE_VISIBILITY
+    static size_t           length(const char_type* __s);
+    _LIBCPP_INLINE_VISIBILITY
+    static const char_type* find(const char_type* __s, size_t __n, const char_type& __a);
+    static char_type*       move(char_type* __s1, const char_type* __s2, size_t __n);
+    _LIBCPP_INLINE_VISIBILITY
+    static char_type*       copy(char_type* __s1, const char_type* __s2, size_t __n);
+    _LIBCPP_INLINE_VISIBILITY
+    static char_type*       assign(char_type* __s, size_t __n, char_type __a);
+
+    static inline _LIBCPP_CONSTEXPR int_type  not_eof(int_type __c) _NOEXCEPT
+        {return eq_int_type(__c, eof()) ? ~eof() : __c;}
+    static inline _LIBCPP_CONSTEXPR char_type to_char_type(int_type __c) _NOEXCEPT
+        {return char_type(__c);}
+    static inline _LIBCPP_CONSTEXPR int_type  to_int_type(char_type __c) _NOEXCEPT
+        {return int_type(__c);}
+    static inline _LIBCPP_CONSTEXPR bool      eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT
+        {return __c1 == __c2;}
+    static inline _LIBCPP_CONSTEXPR int_type  eof() _NOEXCEPT
+        {return int_type(EOF);}
+};
+
+template <class _CharT>
+int
+char_traits<_CharT>::compare(const char_type* __s1, const char_type* __s2, size_t __n)
+{
+    for (; __n; --__n, ++__s1, ++__s2)
+    {
+        if (lt(*__s1, *__s2))
+            return -1;
+        if (lt(*__s2, *__s1))
+            return 1;
+    }
+    return 0;
+}
+
+template <class _CharT>
+inline
+size_t
+char_traits<_CharT>::length(const char_type* __s)
+{
+    size_t __len = 0;
+    for (; !eq(*__s, char_type(0)); ++__s)
+        ++__len;
+    return __len;
+}
+
+template <class _CharT>
+inline
+const _CharT*
+char_traits<_CharT>::find(const char_type* __s, size_t __n, const char_type& __a)
+{
+    for (; __n; --__n)
+    {
+        if (eq(*__s, __a))
+            return __s;
+        ++__s;
+    }
+    return 0;
+}
+
+template <class _CharT>
+_CharT*
+char_traits<_CharT>::move(char_type* __s1, const char_type* __s2, size_t __n)
+{
+    char_type* __r = __s1;
+    if (__s1 < __s2)
+    {
+        for (; __n; --__n, ++__s1, ++__s2)
+            assign(*__s1, *__s2);
+    }
+    else if (__s2 < __s1)
+    {
+        __s1 += __n;
+        __s2 += __n;
+        for (; __n; --__n)
+            assign(*--__s1, *--__s2);
+    }
+    return __r;
+}
+
+template <class _CharT>
+inline
+_CharT*
+char_traits<_CharT>::copy(char_type* __s1, const char_type* __s2, size_t __n)
+{
+    _LIBCPP_ASSERT(__s2 < __s1 || __s2 >= __s1+__n, "char_traits::copy overlapped range");
+    char_type* __r = __s1;
+    for (; __n; --__n, ++__s1, ++__s2)
+        assign(*__s1, *__s2);
+    return __r;
+}
+
+template <class _CharT>
+inline
+_CharT*
+char_traits<_CharT>::assign(char_type* __s, size_t __n, char_type __a)
+{
+    char_type* __r = __s;
+    for (; __n; --__n, ++__s)
+        assign(*__s, __a);
+    return __r;
+}
+
+// char_traits<char>
+
+template <>
+struct _LIBCPP_TYPE_VIS_ONLY char_traits<char>
+{
+    typedef char      char_type;
+    typedef int       int_type;
+    typedef streamoff off_type;
+    typedef streampos pos_type;
+    typedef mbstate_t state_type;
+
+    static inline void assign(char_type& __c1, const char_type& __c2) _NOEXCEPT
+        {__c1 = __c2;}
+    static inline _LIBCPP_CONSTEXPR bool eq(char_type __c1, char_type __c2) _NOEXCEPT
+            {return __c1 == __c2;}
+    static inline _LIBCPP_CONSTEXPR bool lt(char_type __c1, char_type __c2) _NOEXCEPT
+        {return (unsigned char)__c1 < (unsigned char)__c2;}
+
+    static inline int compare(const char_type* __s1, const char_type* __s2, size_t __n)
+        {return __n == 0 ? 0 : memcmp(__s1, __s2, __n);}
+    static inline size_t length(const char_type* __s) {return strlen(__s);}
+    static inline const char_type* find(const char_type* __s, size_t __n, const char_type& __a)
+        {return __n == 0 ? NULL : (const char_type*) memchr(__s, to_int_type(__a), __n);}
+    static inline char_type* move(char_type* __s1, const char_type* __s2, size_t __n)
+        {return __n == 0 ? __s1 : (char_type*) memmove(__s1, __s2, __n);}
+    static inline char_type* copy(char_type* __s1, const char_type* __s2, size_t __n)
+        {
+            _LIBCPP_ASSERT(__s2 < __s1 || __s2 >= __s1+__n, "char_traits::copy overlapped range");
+            return __n == 0 ? __s1 : (char_type*)memcpy(__s1, __s2, __n);
+        }
+    static inline char_type* assign(char_type* __s, size_t __n, char_type __a)
+        {return __n == 0 ? __s : (char_type*)memset(__s, to_int_type(__a), __n);}
+
+    static inline _LIBCPP_CONSTEXPR int_type  not_eof(int_type __c) _NOEXCEPT
+        {return eq_int_type(__c, eof()) ? ~eof() : __c;}
+    static inline _LIBCPP_CONSTEXPR char_type to_char_type(int_type __c) _NOEXCEPT
+        {return char_type(__c);}
+    static inline _LIBCPP_CONSTEXPR int_type to_int_type(char_type __c) _NOEXCEPT
+        {return int_type((unsigned char)__c);}
+    static inline _LIBCPP_CONSTEXPR bool eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT
+        {return __c1 == __c2;}
+    static inline _LIBCPP_CONSTEXPR int_type  eof() _NOEXCEPT
+        {return int_type(EOF);}
+};
+
+// char_traits<wchar_t>
+
+template <>
+struct _LIBCPP_TYPE_VIS_ONLY char_traits<wchar_t>
+{
+    typedef wchar_t   char_type;
+    typedef wint_t    int_type;
+    typedef streamoff off_type;
+    typedef streampos pos_type;
+    typedef mbstate_t state_type;
+
+    static inline void assign(char_type& __c1, const char_type& __c2) _NOEXCEPT
+        {__c1 = __c2;}
+    static inline _LIBCPP_CONSTEXPR bool eq(char_type __c1, char_type __c2) _NOEXCEPT
+        {return __c1 == __c2;}
+    static inline _LIBCPP_CONSTEXPR bool lt(char_type __c1, char_type __c2) _NOEXCEPT
+        {return __c1 < __c2;}
+
+    static inline int compare(const char_type* __s1, const char_type* __s2, size_t __n)
+        {return __n == 0 ? 0 : wmemcmp(__s1, __s2, __n);}
+    static inline size_t length(const char_type* __s)
+        {return wcslen(__s);}
+    static inline const char_type* find(const char_type* __s, size_t __n, const char_type& __a)
+        {return __n == 0 ? NULL : (const char_type*)wmemchr(__s, __a, __n);}
+    static inline char_type* move(char_type* __s1, const char_type* __s2, size_t __n)
+        {return __n == 0 ? __s1 : (char_type*)wmemmove(__s1, __s2, __n);}
+    static inline char_type* copy(char_type* __s1, const char_type* __s2, size_t __n)
+        {
+            _LIBCPP_ASSERT(__s2 < __s1 || __s2 >= __s1+__n, "char_traits::copy overlapped range");
+            return __n == 0 ? __s1 : (char_type*)wmemcpy(__s1, __s2, __n);
+        }
+    static inline char_type* assign(char_type* __s, size_t __n, char_type __a)
+        {return __n == 0 ? __s : (char_type*)wmemset(__s, __a, __n);}
+
+    static inline _LIBCPP_CONSTEXPR int_type  not_eof(int_type __c) _NOEXCEPT
+        {return eq_int_type(__c, eof()) ? ~eof() : __c;}
+    static inline _LIBCPP_CONSTEXPR char_type to_char_type(int_type __c) _NOEXCEPT
+        {return char_type(__c);}
+    static inline _LIBCPP_CONSTEXPR int_type to_int_type(char_type __c) _NOEXCEPT
+        {return int_type(__c);}
+    static inline _LIBCPP_CONSTEXPR bool eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT
+        {return __c1 == __c2;}
+    static inline _LIBCPP_CONSTEXPR int_type eof() _NOEXCEPT
+        {return int_type(WEOF);}
+};
+
+#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
+
+template <>
+struct _LIBCPP_TYPE_VIS_ONLY char_traits<char16_t>
+{
+    typedef char16_t       char_type;
+    typedef uint_least16_t int_type;
+    typedef streamoff      off_type;
+    typedef u16streampos   pos_type;
+    typedef mbstate_t      state_type;
+
+    static inline void assign(char_type& __c1, const char_type& __c2) _NOEXCEPT
+        {__c1 = __c2;}
+    static inline _LIBCPP_CONSTEXPR bool eq(char_type __c1, char_type __c2) _NOEXCEPT
+        {return __c1 == __c2;}
+    static inline _LIBCPP_CONSTEXPR bool lt(char_type __c1, char_type __c2) _NOEXCEPT
+        {return __c1 < __c2;}
+
+    _LIBCPP_INLINE_VISIBILITY
+    static int              compare(const char_type* __s1, const char_type* __s2, size_t __n);
+    _LIBCPP_INLINE_VISIBILITY
+    static size_t           length(const char_type* __s);
+    _LIBCPP_INLINE_VISIBILITY
+    static const char_type* find(const char_type* __s, size_t __n, const char_type& __a);
+    _LIBCPP_INLINE_VISIBILITY
+    static char_type*       move(char_type* __s1, const char_type* __s2, size_t __n);
+    _LIBCPP_INLINE_VISIBILITY
+    static char_type*       copy(char_type* __s1, const char_type* __s2, size_t __n);
+    _LIBCPP_INLINE_VISIBILITY
+    static char_type*       assign(char_type* __s, size_t __n, char_type __a);
+
+    static inline _LIBCPP_CONSTEXPR int_type  not_eof(int_type __c) _NOEXCEPT
+        {return eq_int_type(__c, eof()) ? ~eof() : __c;}
+    static inline _LIBCPP_CONSTEXPR char_type to_char_type(int_type __c) _NOEXCEPT
+        {return char_type(__c);}
+    static inline _LIBCPP_CONSTEXPR int_type to_int_type(char_type __c) _NOEXCEPT
+        {return int_type(__c);}
+    static inline _LIBCPP_CONSTEXPR bool eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT
+        {return __c1 == __c2;}
+    static inline _LIBCPP_CONSTEXPR int_type eof() _NOEXCEPT
+        {return int_type(0xFFFF);}
+};
+
+inline
+int
+char_traits<char16_t>::compare(const char_type* __s1, const char_type* __s2, size_t __n)
+{
+    for (; __n; --__n, ++__s1, ++__s2)
+    {
+        if (lt(*__s1, *__s2))
+            return -1;
+        if (lt(*__s2, *__s1))
+            return 1;
+    }
+    return 0;
+}
+
+inline
+size_t
+char_traits<char16_t>::length(const char_type* __s)
+{
+    size_t __len = 0;
+    for (; !eq(*__s, char_type(0)); ++__s)
+        ++__len;
+    return __len;
+}
+
+inline
+const char16_t*
+char_traits<char16_t>::find(const char_type* __s, size_t __n, const char_type& __a)
+{
+    for (; __n; --__n)
+    {
+        if (eq(*__s, __a))
+            return __s;
+        ++__s;
+    }
+    return 0;
+}
+
+inline
+char16_t*
+char_traits<char16_t>::move(char_type* __s1, const char_type* __s2, size_t __n)
+{
+    char_type* __r = __s1;
+    if (__s1 < __s2)
+    {
+        for (; __n; --__n, ++__s1, ++__s2)
+            assign(*__s1, *__s2);
+    }
+    else if (__s2 < __s1)
+    {
+        __s1 += __n;
+        __s2 += __n;
+        for (; __n; --__n)
+            assign(*--__s1, *--__s2);
+    }
+    return __r;
+}
+
+inline
+char16_t*
+char_traits<char16_t>::copy(char_type* __s1, const char_type* __s2, size_t __n)
+{
+    _LIBCPP_ASSERT(__s2 < __s1 || __s2 >= __s1+__n, "char_traits::copy overlapped range");
+    char_type* __r = __s1;
+    for (; __n; --__n, ++__s1, ++__s2)
+        assign(*__s1, *__s2);
+    return __r;
+}
+
+inline
+char16_t*
+char_traits<char16_t>::assign(char_type* __s, size_t __n, char_type __a)
+{
+    char_type* __r = __s;
+    for (; __n; --__n, ++__s)
+        assign(*__s, __a);
+    return __r;
+}
+
+template <>
+struct _LIBCPP_TYPE_VIS_ONLY char_traits<char32_t>
+{
+    typedef char32_t       char_type;
+    typedef uint_least32_t int_type;
+    typedef streamoff      off_type;
+    typedef u32streampos   pos_type;
+    typedef mbstate_t      state_type;
+
+    static inline void assign(char_type& __c1, const char_type& __c2) _NOEXCEPT
+        {__c1 = __c2;}
+    static inline _LIBCPP_CONSTEXPR bool eq(char_type __c1, char_type __c2) _NOEXCEPT
+        {return __c1 == __c2;}
+    static inline _LIBCPP_CONSTEXPR bool lt(char_type __c1, char_type __c2) _NOEXCEPT
+        {return __c1 < __c2;}
+
+    _LIBCPP_INLINE_VISIBILITY
+    static int              compare(const char_type* __s1, const char_type* __s2, size_t __n);
+    _LIBCPP_INLINE_VISIBILITY
+    static size_t           length(const char_type* __s);
+    _LIBCPP_INLINE_VISIBILITY
+    static const char_type* find(const char_type* __s, size_t __n, const char_type& __a);
+    _LIBCPP_INLINE_VISIBILITY
+    static char_type*       move(char_type* __s1, const char_type* __s2, size_t __n);
+    _LIBCPP_INLINE_VISIBILITY
+    static char_type*       copy(char_type* __s1, const char_type* __s2, size_t __n);
+    _LIBCPP_INLINE_VISIBILITY
+    static char_type*       assign(char_type* __s, size_t __n, char_type __a);
+
+    static inline _LIBCPP_CONSTEXPR int_type  not_eof(int_type __c) _NOEXCEPT
+        {return eq_int_type(__c, eof()) ? ~eof() : __c;}
+    static inline _LIBCPP_CONSTEXPR char_type to_char_type(int_type __c) _NOEXCEPT
+        {return char_type(__c);}
+    static inline _LIBCPP_CONSTEXPR int_type to_int_type(char_type __c) _NOEXCEPT
+        {return int_type(__c);}
+    static inline _LIBCPP_CONSTEXPR bool eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT
+        {return __c1 == __c2;}
+    static inline _LIBCPP_CONSTEXPR int_type eof() _NOEXCEPT
+        {return int_type(0xFFFFFFFF);}
+};
+
+inline
+int
+char_traits<char32_t>::compare(const char_type* __s1, const char_type* __s2, size_t __n)
+{
+    for (; __n; --__n, ++__s1, ++__s2)
+    {
+        if (lt(*__s1, *__s2))
+            return -1;
+        if (lt(*__s2, *__s1))
+            return 1;
+    }
+    return 0;
+}
+
+inline
+size_t
+char_traits<char32_t>::length(const char_type* __s)
+{
+    size_t __len = 0;
+    for (; !eq(*__s, char_type(0)); ++__s)
+        ++__len;
+    return __len;
+}
+
+inline
+const char32_t*
+char_traits<char32_t>::find(const char_type* __s, size_t __n, const char_type& __a)
+{
+    for (; __n; --__n)
+    {
+        if (eq(*__s, __a))
+            return __s;
+        ++__s;
+    }
+    return 0;
+}
+
+inline
+char32_t*
+char_traits<char32_t>::move(char_type* __s1, const char_type* __s2, size_t __n)
+{
+    char_type* __r = __s1;
+    if (__s1 < __s2)
+    {
+        for (; __n; --__n, ++__s1, ++__s2)
+            assign(*__s1, *__s2);
+    }
+    else if (__s2 < __s1)
+    {
+        __s1 += __n;
+        __s2 += __n;
+        for (; __n; --__n)
+            assign(*--__s1, *--__s2);
+    }
+    return __r;
+}
+
+inline
+char32_t*
+char_traits<char32_t>::copy(char_type* __s1, const char_type* __s2, size_t __n)
+{
+    _LIBCPP_ASSERT(__s2 < __s1 || __s2 >= __s1+__n, "char_traits::copy overlapped range");
+    char_type* __r = __s1;
+    for (; __n; --__n, ++__s1, ++__s2)
+        assign(*__s1, *__s2);
+    return __r;
+}
+
+inline
+char32_t*
+char_traits<char32_t>::assign(char_type* __s, size_t __n, char_type __a)
+{
+    char_type* __r = __s;
+    for (; __n; --__n, ++__s)
+        assign(*__s, __a);
+    return __r;
+}
+
+#endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
+
+// helper fns for basic_string and string_view
+
+// __str_find
+template<class _CharT, class _SizeT, class _Traits, _SizeT __npos>
+inline _SizeT _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+__str_find(const _CharT *__p, _SizeT __sz, 
+             _CharT __c, _SizeT __pos) _NOEXCEPT
+{
+    if (__pos >= __sz)
+        return __npos;
+    const _CharT* __r = _Traits::find(__p + __pos, __sz - __pos, __c);
+    if (__r == 0)
+        return __npos;
+    return static_cast<_SizeT>(__r - __p);
+}
+
+template<class _CharT, class _SizeT, class _Traits, _SizeT __npos>
+inline _SizeT _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+__str_find(const _CharT *__p, _SizeT __sz, 
+       const _CharT* __s, _SizeT __pos, _SizeT __n) _NOEXCEPT
+{
+    if (__pos > __sz || __sz - __pos < __n)
+        return __npos;
+    if (__n == 0)
+        return __pos;
+    const _CharT* __r = 
+        _VSTD::__search(__p + __pos, __p + __sz,
+                        __s, __s + __n, _Traits::eq,
+                        random_access_iterator_tag(), random_access_iterator_tag()).first;
+    if (__r == __p + __sz)
+        return __npos;
+    return static_cast<_SizeT>(__r - __p);
+}
+
+
+// __str_rfind
+
+template<class _CharT, class _SizeT, class _Traits, _SizeT __npos>
+inline _SizeT _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+__str_rfind(const _CharT *__p, _SizeT __sz, 
+              _CharT __c, _SizeT __pos) _NOEXCEPT
+{
+    if (__sz < 1)
+        return __npos;
+    if (__pos < __sz)
+        ++__pos;
+    else
+        __pos = __sz;
+    for (const _CharT* __ps = __p + __pos; __ps != __p;)
+    {
+        if (_Traits::eq(*--__ps, __c))
+            return static_cast<_SizeT>(__ps - __p);
+    }
+    return __npos;
+}
+
+template<class _CharT, class _SizeT, class _Traits, _SizeT __npos>
+inline _SizeT _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+__str_rfind(const _CharT *__p, _SizeT __sz, 
+        const _CharT* __s, _SizeT __pos, _SizeT __n) _NOEXCEPT
+{
+    __pos = _VSTD::min(__pos, __sz);
+    if (__n < __sz - __pos)
+        __pos += __n;
+    else
+        __pos = __sz;
+    const _CharT* __r = _VSTD::__find_end(
+                  __p, __p + __pos, __s, __s + __n, _Traits::eq, 
+                        random_access_iterator_tag(), random_access_iterator_tag());
+    if (__n > 0 && __r == __p + __pos)
+        return __npos;
+    return static_cast<_SizeT>(__r - __p);
+}
+
+// __str_find_first_of
+template<class _CharT, class _SizeT, class _Traits, _SizeT __npos>
+inline _SizeT _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+__str_find_first_of(const _CharT *__p, _SizeT __sz,
+                const _CharT* __s, _SizeT __pos, _SizeT __n) _NOEXCEPT
+{
+    if (__pos >= __sz || __n == 0)
+        return __npos;
+    const _CharT* __r = _VSTD::__find_first_of_ce
+        (__p + __pos, __p + __sz, __s, __s + __n, _Traits::eq );
+    if (__r == __p + __sz)
+        return __npos;
+    return static_cast<_SizeT>(__r - __p);
+}
+
+
+// __str_find_last_of
+template<class _CharT, class _SizeT, class _Traits, _SizeT __npos>
+inline _SizeT _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+__str_find_last_of(const _CharT *__p, _SizeT __sz,
+               const _CharT* __s, _SizeT __pos, _SizeT __n) _NOEXCEPT
+    {
+    if (__n != 0)
+    {
+        if (__pos < __sz)
+            ++__pos;
+        else
+            __pos = __sz;
+        for (const _CharT* __ps = __p + __pos; __ps != __p;)
+        {
+            const _CharT* __r = _Traits::find(__s, __n, *--__ps);
+            if (__r)
+                return static_cast<_SizeT>(__ps - __p);
+        }
+    }
+    return __npos;
+}
+
+
+// __str_find_first_not_of
+template<class _CharT, class _SizeT, class _Traits, _SizeT __npos>
+inline _SizeT _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+__str_find_first_not_of(const _CharT *__p, _SizeT __sz,
+                    const _CharT* __s, _SizeT __pos, _SizeT __n) _NOEXCEPT
+{
+    if (__pos < __sz)
+    {
+        const _CharT* __pe = __p + __sz;
+        for (const _CharT* __ps = __p + __pos; __ps != __pe; ++__ps)
+            if (_Traits::find(__s, __n, *__ps) == 0)
+                return static_cast<_SizeT>(__ps - __p);
+    }
+    return __npos;
+}
+
+
+template<class _CharT, class _SizeT, class _Traits, _SizeT __npos>
+inline _SizeT _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+__str_find_first_not_of(const _CharT *__p, _SizeT __sz,
+                          _CharT __c, _SizeT __pos) _NOEXCEPT
+{
+    if (__pos < __sz)
+    {
+        const _CharT* __pe = __p + __sz;
+        for (const _CharT* __ps = __p + __pos; __ps != __pe; ++__ps)
+            if (!_Traits::eq(*__ps, __c))
+                return static_cast<_SizeT>(__ps - __p);
+    }
+    return __npos;
+}
+
+
+// __str_find_last_not_of
+template<class _CharT, class _SizeT, class _Traits, _SizeT __npos>
+inline _SizeT _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+__str_find_last_not_of(const _CharT *__p, _SizeT __sz,
+                   const _CharT* __s, _SizeT __pos, _SizeT __n) _NOEXCEPT
+{
+    if (__pos < __sz)
+        ++__pos;
+    else
+        __pos = __sz;
+    for (const _CharT* __ps = __p + __pos; __ps != __p;)
+        if (_Traits::find(__s, __n, *--__ps) == 0)
+            return static_cast<_SizeT>(__ps - __p);
+    return __npos;
+}
+
+
+template<class _CharT, class _SizeT, class _Traits, _SizeT __npos>
+inline _SizeT _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+__str_find_last_not_of(const _CharT *__p, _SizeT __sz,
+                         _CharT __c, _SizeT __pos) _NOEXCEPT
+{
+    if (__pos < __sz)
+        ++__pos;
+    else
+        __pos = __sz;
+    for (const _CharT* __ps = __p + __pos; __ps != __p;)
+        if (!_Traits::eq(*--__ps, __c))
+            return static_cast<_SizeT>(__ps - __p);
+    return __npos;
+}
+
+template<class _Ptr>
+size_t _LIBCPP_INLINE_VISIBILITY __do_string_hash(_Ptr __p, _Ptr __e)
+{
+    typedef typename iterator_traits<_Ptr>::value_type value_type;
+    return __murmur2_or_cityhash<size_t>()(__p, (__e-__p)*sizeof(value_type));
+}
+
+template <class _CharT, class _Iter, class _Traits=char_traits<_CharT> >
+struct __quoted_output_proxy
+{
+    _Iter  __first;
+    _Iter  __last;
+    _CharT  __delim;
+    _CharT  __escape;
+
+    __quoted_output_proxy(_Iter __f, _Iter __l, _CharT __d, _CharT __e)
+    : __first(__f), __last(__l), __delim(__d), __escape(__e) {}
+    //  This would be a nice place for a string_ref 
+};
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif  // _LIBCPP___STRING

include/iomanip

@@ -44,6 +44,7 @@ template <class charT, class traits, class Allocator>
 */
 
 #include <__config>
+#include <__string>
 #include <istream>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
@@ -567,19 +568,6 @@ __quoted_input ( basic_istream<_CharT, _Traits> &__is, _String & __string, _Char
 }
 
 
-template <class _CharT, class _Iter, class _Traits=char_traits<_CharT> >
-struct __quoted_output_proxy
-{
-    _Iter  __first;
-    _Iter  __last;
-    _CharT  __delim;
-    _CharT  __escape;
-
-    __quoted_output_proxy(_Iter __f, _Iter __l, _CharT __d, _CharT __e)
-    : __first(__f), __last(__l), __delim(__d), __escape(__e) {}
-    //  This would be a nice place for a string_ref 
-};
-
 template <class _CharT, class _Traits, class _Iter>
 basic_ostream<_CharT, _Traits>& operator<<(
          basic_ostream<_CharT, _Traits>& __os, 

include/ostream

@@ -1080,6 +1080,14 @@ operator<<(basic_ostream<_CharT, _Traits>& __os,
     return _VSTD::__put_character_sequence(__os, __str.data(), __str.size());
 }
 
+template<class _CharT, class _Traits>
+basic_ostream<_CharT, _Traits>&
+operator<<(basic_ostream<_CharT, _Traits>& __os,
+           const basic_string_view<_CharT, _Traits> __sv)
+{
+    return _VSTD::__put_character_sequence(__os, __sv.data(), __sv.size());
+}
+
 template <class _CharT, class _Traits>
 inline _LIBCPP_INLINE_VISIBILITY
 basic_ostream<_CharT, _Traits>&

include/string_view

@@ -0,0 +1,764 @@
+// -*- C++ -*-
+//===------------------------ string_view ---------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP_STRING_VIEW
+#define _LIBCPP_STRING_VIEW
+
+/*
+string_view synopsis
+
+namespace std {
+
+    // 7.2, Class template basic_string_view
+    template<class charT, class traits = char_traits<charT>>
+        class basic_string_view;
+
+    // 7.9, basic_string_view non-member comparison functions
+    template<class charT, class traits>
+    constexpr bool operator==(basic_string_view<charT, traits> x,
+                              basic_string_view<charT, traits> y) noexcept;
+    template<class charT, class traits>
+    constexpr bool operator!=(basic_string_view<charT, traits> x,
+                              basic_string_view<charT, traits> y) noexcept;
+    template<class charT, class traits>
+    constexpr bool operator< (basic_string_view<charT, traits> x,
+                                 basic_string_view<charT, traits> y) noexcept;
+    template<class charT, class traits>
+    constexpr bool operator> (basic_string_view<charT, traits> x,
+                              basic_string_view<charT, traits> y) noexcept;
+    template<class charT, class traits>
+    constexpr bool operator<=(basic_string_view<charT, traits> x,
+                                 basic_string_view<charT, traits> y) noexcept;
+    template<class charT, class traits>
+    constexpr bool operator>=(basic_string_view<charT, traits> x,
+                              basic_string_view<charT, traits> y) noexcept;
+    // see below, sufficient additional overloads of comparison functions
+
+    // 7.10, Inserters and extractors
+    template<class charT, class traits>
+      basic_ostream<charT, traits>&
+        operator<<(basic_ostream<charT, traits>& os,
+                   basic_string_view<charT, traits> str);
+
+    // basic_string_view typedef names
+    typedef basic_string_view<char> string_view;
+    typedef basic_string_view<char16_t> u16string_view;
+    typedef basic_string_view<char32_t> u32string_view;
+    typedef basic_string_view<wchar_t> wstring_view;
+
+    template<class charT, class traits = char_traits<charT>>
+    class basic_string_view {
+      public:
+      // types
+      typedef traits traits_type;
+      typedef charT value_type;
+      typedef charT* pointer;
+      typedef const charT* const_pointer;
+      typedef charT& reference;
+      typedef const charT& const_reference;
+      typedef implementation-defined const_iterator;
+      typedef const_iterator iterator;
+      typedef reverse_iterator<const_iterator> const_reverse_iterator;
+      typedef const_reverse_iterator reverse_iterator;
+      typedef size_t size_type;
+      typedef ptrdiff_t difference_type;
+      static constexpr size_type npos = size_type(-1);
+
+      // 7.3, basic_string_view constructors and assignment operators
+      constexpr basic_string_view() noexcept;
+      constexpr basic_string_view(const basic_string_view&) noexcept = default;
+      basic_string_view& operator=(const basic_string_view&) noexcept = default;
+      template<class Allocator>
+      constexpr basic_string_view(const charT* str);
+      constexpr basic_string_view(const charT* str, size_type len);
+
+      // 7.4, basic_string_view iterator support
+      constexpr const_iterator begin() const noexcept;
+      constexpr const_iterator end() const noexcept;
+      constexpr const_iterator cbegin() const noexcept;
+      constexpr const_iterator cend() const noexcept;
+      const_reverse_iterator rbegin() const noexcept;
+      const_reverse_iterator rend() const noexcept;
+      const_reverse_iterator crbegin() const noexcept;
+      const_reverse_iterator crend() const noexcept;
+
+      // 7.5, basic_string_view capacity
+      constexpr size_type size() const noexcept;
+      constexpr size_type length() const noexcept;
+      constexpr size_type max_size() const noexcept;
+      constexpr bool empty() const noexcept;
+
+      // 7.6, basic_string_view element access
+      constexpr const_reference operator[](size_type pos) const;
+      constexpr const_reference at(size_type pos) const;
+      constexpr const_reference front() const;
+      constexpr const_reference back() const;
+      constexpr const_pointer data() const noexcept;
+
+      // 7.7, basic_string_view modifiers
+      constexpr void clear() noexcept;
+      constexpr void remove_prefix(size_type n);
+      constexpr void remove_suffix(size_type n);
+      constexpr void swap(basic_string_view& s) noexcept;
+
+      size_type copy(charT* s, size_type n, size_type pos = 0) const;
+
+      constexpr basic_string_view substr(size_type pos = 0, size_type n = npos) const;
+      constexpr int compare(basic_string_view s) const noexcept;
+      constexpr int compare(size_type pos1, size_type n1, basic_string_view s) const;
+      constexpr int compare(size_type pos1, size_type n1,
+                            basic_string_view s, size_type pos2, size_type n2) const;
+      constexpr int compare(const charT* s) const;
+      constexpr int compare(size_type pos1, size_type n1, const charT* s) const;
+      constexpr int compare(size_type pos1, size_type n1,
+                            const charT* s, size_type n2) const;
+      constexpr size_type find(basic_string_view s, size_type pos = 0) const noexcept;
+      constexpr size_type find(charT c, size_type pos = 0) const noexcept;
+      constexpr size_type find(const charT* s, size_type pos, size_type n) const;
+      constexpr size_type find(const charT* s, size_type pos = 0) const;
+      constexpr size_type rfind(basic_string_view s, size_type pos = npos) const noexcept;
+      constexpr size_type rfind(charT c, size_type pos = npos) const noexcept;
+      constexpr size_type rfind(const charT* s, size_type pos, size_type n) const;
+      constexpr size_type rfind(const charT* s, size_type pos = npos) const;
+      constexpr size_type find_first_of(basic_string_view s, size_type pos = 0) const noexcept;
+      constexpr size_type find_first_of(charT c, size_type pos = 0) const noexcept;
+      constexpr size_type find_first_of(const charT* s, size_type pos, size_type n) const;
+      constexpr size_type find_first_of(const charT* s, size_type pos = 0) const;
+      constexpr size_type find_last_of(basic_string_view s, size_type pos = npos) const noexcept;
+      constexpr size_type find_last_of(charT c, size_type pos = npos) const noexcept;
+      constexpr size_type find_last_of(const charT* s, size_type pos, size_type n) const;
+      constexpr size_type find_last_of(const charT* s, size_type pos = npos) const;
+      constexpr size_type find_first_not_of(basic_string_view s, size_type pos = 0) const noexcept;
+      constexpr size_type find_first_not_of(charT c, size_type pos = 0) const noexcept;
+      constexpr size_type find_first_not_of(const charT* s, size_type pos, size_type n) const;
+      constexpr size_type find_first_not_of(const charT* s, size_type pos = 0) const;
+      constexpr size_type find_last_not_of(basic_string_view s, size_type pos = npos) const noexcept;
+      constexpr size_type find_last_not_of(charT c, size_type pos = npos) const noexcept;
+      constexpr size_type find_last_not_of(const charT* s, size_type pos, size_type n) const;
+      constexpr size_type find_last_not_of(const charT* s, size_type pos = npos) const;
+
+     private:
+      const_pointer data_;  // exposition only
+      size_type     size_;  // exposition only
+    };
+
+  // 7.11, Hash support
+  template <class T> struct hash;
+  template <> struct hash<string_view>;
+  template <> struct hash<u16string_view>;
+  template <> struct hash<u32string_view>;
+  template <> struct hash<wstring_view>;
+
+}  // namespace std
+
+
+*/
+
+#include <__config>
+
+#include <__string>
+#include <algorithm>
+#include <iterator>
+#include <__debug>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+template<class _CharT, class _Traits = char_traits<_CharT> >
+class _LIBCPP_TYPE_VIS_ONLY basic_string_view {
+public:
+	// types
+	typedef _Traits                                    traits_type;
+	typedef _CharT                                     value_type;
+	typedef const _CharT*                              pointer;
+	typedef const _CharT*                              const_pointer;
+	typedef const _CharT&                              reference;
+	typedef const _CharT&                              const_reference;
+	typedef const_pointer                              const_iterator; // See [string.view.iterators]
+	typedef const_iterator                             iterator;
+	typedef _VSTD::reverse_iterator<const_iterator>    const_reverse_iterator;
+	typedef const_reverse_iterator                     reverse_iterator;
+	typedef size_t                                     size_type;
+	typedef ptrdiff_t                                  difference_type;
+	static _LIBCPP_CONSTEXPR const size_type npos = -1; // size_type(-1);
+
+	// [string.view.cons], construct/copy
+	_LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+	basic_string_view() _NOEXCEPT : __data (nullptr), __size(0) {}
+
+	_LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+	basic_string_view(const basic_string_view&) _NOEXCEPT = default;
+
+	_LIBCPP_INLINE_VISIBILITY
+	basic_string_view& operator=(const basic_string_view&) _NOEXCEPT = default;
+
+	_LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+	basic_string_view(const _CharT* __s, size_type __len)
+		: __data(__s), __size(__len)
+	{
+#if _LIBCPP_STD_VER > 11
+        _LIBCPP_ASSERT(__len == 0 || __s != nullptr, "string_view::string_view(_CharT *, size_t): received nullptr");
+#endif
+	}
+
+	_LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+	basic_string_view(const _CharT* __s)
+		: __data(__s), __size(_Traits::length(__s)) {}
+
+	// [string.view.iterators], iterators
+	_LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+	const_iterator begin()  const _NOEXCEPT { return cbegin(); }
+
+	_LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+	const_iterator end()    const _NOEXCEPT { return cend(); }
+
+	_LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+	const_iterator cbegin() const _NOEXCEPT { return __data; }
+
+	_LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+	const_iterator cend()   const _NOEXCEPT { return __data + __size; }
+
+	_LIBCPP_INLINE_VISIBILITY
+	const_reverse_iterator rbegin()   const _NOEXCEPT { return const_reverse_iterator(cend()); }
+
+	_LIBCPP_INLINE_VISIBILITY
+	const_reverse_iterator rend()     const _NOEXCEPT { return const_reverse_iterator(cbegin()); }
+
+	_LIBCPP_INLINE_VISIBILITY
+	const_reverse_iterator crbegin()  const _NOEXCEPT { return const_reverse_iterator(cend()); }
+
+	_LIBCPP_INLINE_VISIBILITY
+	const_reverse_iterator crend()    const _NOEXCEPT { return const_reverse_iterator(cbegin()); }
+
+	// [string.view.capacity], capacity
+	_LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+	size_type size()     const _NOEXCEPT { return __size; }
+
+	_LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+	size_type length()   const _NOEXCEPT { return __size; }
+
+	_LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+	size_type max_size() const _NOEXCEPT { return numeric_limits<size_type>::max(); }
+
+	_LIBCPP_CONSTEXPR bool _LIBCPP_INLINE_VISIBILITY
+	empty()         const _NOEXCEPT { return __size == 0; }
+
+	// [string.view.access], element access
+	_LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+	const_reference operator[](size_type __pos) const _NOEXCEPT { return __data[__pos]; }
+
+	_LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+	const_reference at(size_type __pos) const
+	{
+		return __pos >= size()
+			? (__libcpp_throw(out_of_range("string_view::at")), __data[0])
+			: __data[__pos];
+	}
+
+	_LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+	const_reference front() const
+	{
+		return _LIBCPP_ASSERT(!empty(), "string_view::front(): string is empty"), __data[0];
+	}
+
+	_LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+	const_reference back() const
+	{
+		return _LIBCPP_ASSERT(!empty(), "string_view::back(): string is empty"), __data[__size-1];
+	}
+
+	_LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+	const_pointer data() const _NOEXCEPT { return __data; }
+
+	// [string.view.modifiers], modifiers:
+	_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+	void clear() _NOEXCEPT
+	{
+		__data = nullptr;
+		__size = 0;
+	}
+
+	_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+	void remove_prefix(size_type __n) _NOEXCEPT
+	{
+		_LIBCPP_ASSERT(__n <= size(), "remove_prefix() can't remove more than size()");
+		__data += __n;
+		__size -= __n;
+	}
+
+	_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+	void remove_suffix(size_type __n) _NOEXCEPT
+	{
+		_LIBCPP_ASSERT(__n <= size(), "remove_suffix() can't remove more than size()");
+		__size -= __n;
+	}
+
+	_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+	void swap(basic_string_view& __other) _NOEXCEPT
+	{
+		const value_type *__p = __data;
+		__data = __other.__data;
+		__other.__data = __p;
+
+		size_type __sz = __size;
+		__size = __other.__size;
+		__other.__size = __sz;
+	}
+
+	_LIBCPP_INLINE_VISIBILITY
+	size_type copy(_CharT* __s, size_type __n, size_type __pos = 0) const
+	{
+		if (__pos > size())
+			__libcpp_throw(out_of_range("string_view::copy"));
+		size_type __rlen = _VSTD::min( __n, size() - __pos );
+		copy_n(begin() + __pos, __rlen, __s );
+		return __rlen;
+	}
+
+	_LIBCPP_CONSTEXPR _LIBCPP_INLINE_VISIBILITY
+	basic_string_view substr(size_type __pos = 0, size_type __n = npos) const
+	{
+		return __pos > size()
+			? (__libcpp_throw((out_of_range("string_view::substr"))), basic_string_view())
+			: basic_string_view(data() + __pos, _VSTD::min(__n, size() - __pos));
+	}
+
+	_LIBCPP_CONSTEXPR_AFTER_CXX11 int compare(basic_string_view __sv) const _NOEXCEPT
+	{
+		size_type __rlen = _VSTD::min( size(), __sv.size());
+		int __retval = _Traits::compare(data(), __sv.data(), __rlen);
+		if ( __retval == 0 ) // first __rlen chars matched
+			__retval = size() == __sv.size() ? 0 : ( size() < __sv.size() ? -1 : 1 );
+		return __retval;
+	}
+
+	_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+	int compare(size_type __pos1, size_type __n1, basic_string_view __sv) const
+	{
+		return substr(__pos1, __n1).compare(__sv);
+	}
+
+	_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+	int compare(                       size_type __pos1, size_type __n1, 
+				basic_string_view _sv, size_type __pos2, size_type __n2) const
+	{
+		return substr(__pos1, __n1).compare(_sv.substr(__pos2, __n2));
+	}
+
+	_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+	int compare(const _CharT* __s) const
+	{
+		return compare(basic_string_view(__s));
+	}
+
+	_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+	int compare(size_type __pos1, size_type __n1, const _CharT* __s) const
+	{
+		return substr(__pos1, __n1).compare(basic_string_view(__s));
+	}
+
+	_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+	int compare(size_type __pos1, size_type __n1, const _CharT* __s, size_type __n2) const
+	{
+		return substr(__pos1, __n1).compare(basic_string_view(__s, __n2));
+	}
+
+	// find
+	_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+	size_type find(basic_string_view __s, size_type __pos = 0) const _NOEXCEPT
+	{
+		_LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find(): received nullptr");
+		return __str_find<value_type, size_type, traits_type, npos>
+			(data(), size(), __s.data(), __pos, __s.size());
+	}
+
+	_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+	size_type find(_CharT __c, size_type __pos = 0) const _NOEXCEPT
+	{
+		return __str_find<value_type, size_type, traits_type, npos>
+			(data(), size(), __c, __pos);
+	}
+
+	_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+	size_type find(const _CharT* __s, size_type __pos, size_type __n) const
+	{
+		_LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::find(): received nullptr");
+		return __str_find<value_type, size_type, traits_type, npos>
+			(data(), size(), __s, __pos, __n);
+	}
+
+	_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+	size_type find(const _CharT* __s, size_type __pos = 0) const
+	{
+		_LIBCPP_ASSERT(__s != nullptr, "string_view::find(): received nullptr");
+		return __str_find<value_type, size_type, traits_type, npos>
+			(data(), size(), __s, __pos, traits_type::length(__s));
+	}
+
+	// rfind
+	_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+	size_type rfind(basic_string_view __s, size_type __pos = npos) const _NOEXCEPT
+	{
+		_LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find(): received nullptr");
+		return __str_rfind<value_type, size_type, traits_type, npos>
+			(data(), size(), __s.data(), __pos, __s.size());
+	}
+
+	_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+	size_type rfind(_CharT __c, size_type __pos = npos) const _NOEXCEPT
+	{
+		return __str_rfind<value_type, size_type, traits_type, npos>
+			(data(), size(), __c, __pos);
+	}
+
+	_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+	size_type rfind(const _CharT* __s, size_type __pos, size_type __n) const
+	{
+		_LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::rfind(): received nullptr");
+		return __str_rfind<value_type, size_type, traits_type, npos>
+			(data(), size(), __s, __pos, __n);
+	}
+
+	_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+	size_type rfind(const _CharT* __s, size_type __pos=npos) const
+	{
+		_LIBCPP_ASSERT(__s != nullptr, "string_view::rfind(): received nullptr");
+		return __str_rfind<value_type, size_type, traits_type, npos>
+			(data(), size(), __s, __pos, traits_type::length(__s));
+	}
+
+	// find_first_of
+	_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+	size_type find_first_of(basic_string_view __s, size_type __pos = 0) const _NOEXCEPT
+	{
+		_LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find_first_of(): received nullptr");
+		return __str_find_first_of<value_type, size_type, traits_type, npos>
+			(data(), size(), __s.data(), __pos, __s.size());
+	}
+
+	_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+	size_type find_first_of(_CharT __c, size_type __pos = 0) const _NOEXCEPT
+	{ return find(__c, __pos); }
+
+	_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+	size_type find_first_of(const _CharT* __s, size_type __pos, size_type __n) const
+	{
+		_LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::find_first_of(): received nullptr");
+		return __str_find_first_of<value_type, size_type, traits_type, npos>
+			(data(), size(), __s, __pos, __n);
+	}
+
+	_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+	size_type find_first_of(const _CharT* __s, size_type __pos=0) const
+	{
+		_LIBCPP_ASSERT(__s != nullptr, "string_view::find_first_of(): received nullptr");
+		return __str_find_first_of<value_type, size_type, traits_type, npos>
+			(data(), size(), __s, __pos, traits_type::length(__s));
+	}
+
+	// find_last_of
+	_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+	size_type find_last_of(basic_string_view __s, size_type __pos=npos) const _NOEXCEPT
+	{
+		_LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find_last_of(): received nullptr");
+		return __str_find_last_of<value_type, size_type, traits_type, npos>
+			(data(), size(), __s.data(), __pos, __s.size());
+	}
+
+	_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+	size_type find_last_of(_CharT __c, size_type __pos = npos) const _NOEXCEPT
+	{ return rfind(__c, __pos); }
+
+	_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+	size_type find_last_of(const _CharT* __s, size_type __pos, size_type __n) const
+	{
+		_LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::find_last_of(): received nullptr");
+		return __str_find_last_of<value_type, size_type, traits_type, npos>
+			(data(), size(), __s, __pos, __n);
+	}
+
+	_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+	size_type find_last_of(const _CharT* __s, size_type __pos=npos) const
+	{
+		_LIBCPP_ASSERT(__s != nullptr, "string_view::find_last_of(): received nullptr");
+		return __str_find_last_of<value_type, size_type, traits_type, npos>
+			(data(), size(), __s, __pos, traits_type::length(__s));
+	}
+
+	// find_first_not_of
+	_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+	size_type find_first_not_of(basic_string_view __s, size_type __pos=0) const _NOEXCEPT
+	{
+		_LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find_first_not_of(): received nullptr");
+		return __str_find_first_not_of<value_type, size_type, traits_type, npos>
+			(data(), size(), __s.data(), __pos, __s.size());
+	}
+
+	_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+	size_type find_first_not_of(_CharT __c, size_type __pos=0) const _NOEXCEPT
+	{
+		return __str_find_first_not_of<value_type, size_type, traits_type, npos>
+			(data(), size(), __c, __pos);
+	}
+
+	_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+	size_type find_first_not_of(const _CharT* __s, size_type __pos, size_type __n) const
+	{
+		_LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::find_first_not_of(): received nullptr");
+		return __str_find_first_not_of<value_type, size_type, traits_type, npos>
+			(data(), size(), __s, __pos, __n);
+	}
+
+	_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+	size_type find_first_not_of(const _CharT* __s, size_type __pos=0) const
+	{
+		_LIBCPP_ASSERT(__s != nullptr, "string_view::find_first_not_of(): received nullptr");
+		return __str_find_first_not_of<value_type, size_type, traits_type, npos>
+			(data(), size(), __s, __pos, traits_type::length(__s));
+	}
+
+	// find_last_not_of
+	_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+	size_type find_last_not_of(basic_string_view __s, size_type __pos=npos) const _NOEXCEPT
+	{
+		_LIBCPP_ASSERT(__s.size() == 0 || __s.data() != nullptr, "string_view::find_last_not_of(): received nullptr");
+		return __str_find_last_not_of<value_type, size_type, traits_type, npos>
+			(data(), size(), __s.data(), __pos, __s.size());
+	}
+
+	_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+	size_type find_last_not_of(_CharT __c, size_type __pos=npos) const _NOEXCEPT
+	{
+		return __str_find_last_not_of<value_type, size_type, traits_type, npos>
+			(data(), size(), __c, __pos);
+	}
+
+	_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+	size_type find_last_not_of(const _CharT* __s, size_type __pos, size_type __n) const
+	{
+		_LIBCPP_ASSERT(__n == 0 || __s != nullptr, "string_view::find_last_not_of(): received nullptr");
+		return __str_find_last_not_of<value_type, size_type, traits_type, npos>
+			(data(), size(), __s, __pos, __n);
+	}
+
+	_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+	size_type find_last_not_of(const _CharT* __s, size_type __pos=npos) const
+	{
+		_LIBCPP_ASSERT(__s != nullptr, "string_view::find_last_not_of(): received nullptr");
+		return __str_find_last_not_of<value_type, size_type, traits_type, npos>
+			(data(), size(), __s, __pos, traits_type::length(__s));
+	}
+
+private:
+	const   value_type* __data;
+	size_type           __size;
+};
+
+
+// [string.view.comparison]
+// operator ==
+template<class _CharT, class _Traits>
+_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+bool operator==(basic_string_view<_CharT, _Traits> __lhs,
+				basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
+{
+	if ( __lhs.size() != __rhs.size()) return false;
+	return __lhs.compare(__rhs) == 0;
+}
+
+template<class _CharT, class _Traits>
+_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+bool operator==(basic_string_view<_CharT, _Traits> __lhs,
+				typename common_type<basic_string_view<_CharT, _Traits> >::type __rhs) _NOEXCEPT
+{
+	if ( __lhs.size() != __rhs.size()) return false;
+	return __lhs.compare(__rhs) == 0;
+}
+
+template<class _CharT, class _Traits>
+_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+bool operator==(typename common_type<basic_string_view<_CharT, _Traits> >::type __lhs, 
+				basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
+{
+	if ( __lhs.size() != __rhs.size()) return false;
+	return __lhs.compare(__rhs) == 0;
+}
+
+
+// operator !=
+template<class _CharT, class _Traits>
+_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+bool operator!=(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
+{
+	if ( __lhs.size() != __rhs.size())
+		return true;
+	return __lhs.compare(__rhs) != 0;
+}
+
+template<class _CharT, class _Traits>
+_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+bool operator!=(basic_string_view<_CharT, _Traits> __lhs,
+				typename common_type<basic_string_view<_CharT, _Traits> >::type __rhs) _NOEXCEPT
+{
+	if ( __lhs.size() != __rhs.size())
+		return true;
+	return __lhs.compare(__rhs) != 0;
+}
+
+template<class _CharT, class _Traits>
+_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+bool operator!=(typename common_type<basic_string_view<_CharT, _Traits> >::type __lhs, 
+				basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
+{
+	if ( __lhs.size() != __rhs.size())
+		return true;
+	return __lhs.compare(__rhs) != 0;
+}
+
+
+// operator <
+template<class _CharT, class _Traits>
+_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+bool operator<(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
+{
+	return __lhs.compare(__rhs) < 0;
+}
+
+template<class _CharT, class _Traits>
+_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+bool operator<(basic_string_view<_CharT, _Traits> __lhs,
+				typename common_type<basic_string_view<_CharT, _Traits> >::type __rhs) _NOEXCEPT
+{
+	return __lhs.compare(__rhs) < 0;
+}
+
+template<class _CharT, class _Traits>
+_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+bool operator<(typename common_type<basic_string_view<_CharT, _Traits> >::type __lhs, 
+				basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
+{
+	return __lhs.compare(__rhs) < 0;
+}
+
+
+// operator >
+template<class _CharT, class _Traits>
+_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+bool operator> (basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
+{
+	return __lhs.compare(__rhs) > 0;
+}
+
+template<class _CharT, class _Traits>
+_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+bool operator>(basic_string_view<_CharT, _Traits> __lhs,
+				typename common_type<basic_string_view<_CharT, _Traits> >::type __rhs) _NOEXCEPT
+{
+	return __lhs.compare(__rhs) > 0;
+}
+
+template<class _CharT, class _Traits>
+_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+bool operator>(typename common_type<basic_string_view<_CharT, _Traits> >::type __lhs, 
+				basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
+{
+	return __lhs.compare(__rhs) > 0;
+}
+
+
+// operator <=
+template<class _CharT, class _Traits>
+_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+bool operator<=(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
+{
+	return __lhs.compare(__rhs) <= 0;
+}
+
+template<class _CharT, class _Traits>
+_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+bool operator<=(basic_string_view<_CharT, _Traits> __lhs,
+				typename common_type<basic_string_view<_CharT, _Traits> >::type __rhs) _NOEXCEPT
+{
+	return __lhs.compare(__rhs) <= 0;
+}
+
+template<class _CharT, class _Traits>
+_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+bool operator<=(typename common_type<basic_string_view<_CharT, _Traits> >::type __lhs, 
+				basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
+{
+	return __lhs.compare(__rhs) <= 0;
+}
+
+
+// operator >=
+template<class _CharT, class _Traits>
+_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+bool operator>=(basic_string_view<_CharT, _Traits> __lhs, basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
+{
+	return __lhs.compare(__rhs) >= 0;
+}
+
+
+template<class _CharT, class _Traits>
+_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+bool operator>=(basic_string_view<_CharT, _Traits> __lhs,
+				typename common_type<basic_string_view<_CharT, _Traits> >::type __rhs) _NOEXCEPT
+{
+	return __lhs.compare(__rhs) >= 0;
+}
+
+template<class _CharT, class _Traits>
+_LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY
+bool operator>=(typename common_type<basic_string_view<_CharT, _Traits> >::type __lhs, 
+				basic_string_view<_CharT, _Traits> __rhs) _NOEXCEPT
+{
+	return __lhs.compare(__rhs) >= 0;
+}
+
+typedef basic_string_view<char>     string_view;
+typedef basic_string_view<char16_t> u16string_view;
+typedef basic_string_view<char32_t> u32string_view;
+typedef basic_string_view<wchar_t>  wstring_view;
+
+// [string.view.hash]
+template<class _CharT, class _Traits>
+struct _LIBCPP_TYPE_VIS_ONLY hash<basic_string_view<_CharT, _Traits> >
+    : public unary_function<basic_string_view<_CharT, _Traits>, size_t>
+{
+    size_t operator()(const basic_string_view<_CharT, _Traits> __val) const _NOEXCEPT;
+};
+
+template<class _CharT, class _Traits>
+size_t
+hash<basic_string_view<_CharT, _Traits> >::operator()(
+        const basic_string_view<_CharT, _Traits> __val) const _NOEXCEPT
+{
+    return __do_string_hash(__val.data(), __val.data() + __val.size());
+}
+
+#if _LIBCPP_STD_VER > 11
+
+template <class _CharT, class _Traits>
+__quoted_output_proxy<_CharT, const _CharT *, _Traits>
+quoted (basic_string_view <_CharT, _Traits> __sv,
+             _CharT __delim = _CharT('"'), _CharT __escape=_CharT('\\'))
+{
+    return __quoted_output_proxy<_CharT, const _CharT *, _Traits> 
+         ( __sv.data(), __sv.data() + __sv.size(), __delim, __escape );
+}
+#endif // _LIBCPP_STD_VER > 11
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP_STRING_VIEW

test/std/strings/basic.string/string.cons/string_view.fail.cpp

@@ -0,0 +1,23 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// explicit basic_string(basic_string_view<CharT, traits> sv, const Allocator& a = Allocator());
+
+#include <string>
+#include <string_view>
+
+void foo ( const string &s ) {}
+
+int main()
+{
+	std::string_view sv = "ABCDE";
+	foo(sv);	// requires implicit conversion from string_view to string
+}

test/std/strings/basic.string/string.cons/string_view.pass.cpp

@@ -0,0 +1,89 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// explicit basic_string(basic_string_view<CharT, traits> sv, const Allocator& a = Allocator());
+
+#include <string>
+#include <string_view>
+#include <stdexcept>
+#include <algorithm>
+#include <cassert>
+
+#include "test_macros.h"
+#include "test_allocator.h"
+#include "min_allocator.h"
+
+template <class charT>
+void
+test(std::basic_string_view<charT> sv)
+{
+    typedef std::basic_string<charT, std::char_traits<charT>, test_allocator<charT> > S;
+    typedef typename S::traits_type T;
+    typedef typename S::allocator_type A;
+    S s2(sv);
+    LIBCPP_ASSERT(s2.__invariants());
+    assert(s2.size() == sv.size());
+    assert(T::compare(s2.data(), sv.data(), sv.size()) == 0);
+    assert(s2.get_allocator() == A());
+    assert(s2.capacity() >= s2.size());
+}
+
+template <class charT, class A>
+void
+test(std::basic_string_view<charT> sv, const A& a)
+{
+    typedef std::basic_string<charT, std::char_traits<charT>, A> S;
+    typedef typename S::traits_type T;
+    S s2(sv, a);
+    LIBCPP_ASSERT(s2.__invariants());
+    assert(s2.size() == sv.size());
+    assert(T::compare(s2.data(), sv.data(), sv.size()) == 0);
+    assert(s2.get_allocator() == a);
+    assert(s2.capacity() >= s2.size());
+}
+
+int main()
+{
+    {
+    typedef test_allocator<char> A;
+    typedef std::basic_string_view<char, std::char_traits<char> > SV;
+
+    test(SV(""));
+    test(SV(""), A(2));
+
+    test(SV("1"));
+    test(SV("1") ,A(2));
+
+    test(SV("1234567980"));
+    test(SV("1234567980"), A(2));
+
+    test(SV("123456798012345679801234567980123456798012345679801234567980"));
+    test(SV("123456798012345679801234567980123456798012345679801234567980"), A(2));
+    }
+#if TEST_STD_VER >= 11
+    {
+    typedef min_allocator<char> A;
+    typedef std::basic_string_view<char, std::char_traits<char> > SV;
+
+    test(SV(""));
+    test(SV(""), A());
+
+    test(SV("1"));
+    test(SV("1") ,A());
+
+    test(SV("1234567980"));
+    test(SV("1234567980"), A());
+
+    test(SV("123456798012345679801234567980123456798012345679801234567980"));
+    test(SV("123456798012345679801234567980123456798012345679801234567980"), A());
+    }
+#endif
+}

test/std/strings/basic.string/string.modifiers/string_append/string_view.pass.cpp

@@ -0,0 +1,83 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// basic_string<charT,traits,Allocator>&
+//   append(basic_string_view<charT,traits> sv);
+
+#include <string>
+#include <string_view>
+#include <cassert>
+
+#include "test_macros.h"
+#include "min_allocator.h"
+
+template <class S, class SV>
+void
+test(S s, SV sv, S expected)
+{
+    s.append(sv);
+    LIBCPP_ASSERT(s.__invariants());
+    assert(s == expected);
+}
+
+int main()
+{
+    {
+    typedef std::string S;
+    typedef std::string_view SV;
+    test(S(), SV(), S());
+    test(S(), SV("12345"), S("12345"));
+    test(S(), SV("1234567890"), S("1234567890"));
+    test(S(), SV("12345678901234567890"), S("12345678901234567890"));
+
+    test(S("12345"), SV(), S("12345"));
+    test(S("12345"), SV("12345"), S("1234512345"));
+    test(S("12345"), SV("1234567890"), S("123451234567890"));
+    test(S("12345"), SV("12345678901234567890"), S("1234512345678901234567890"));
+
+    test(S("1234567890"), SV(), S("1234567890"));
+    test(S("1234567890"), SV("12345"), S("123456789012345"));
+    test(S("1234567890"), SV("1234567890"), S("12345678901234567890"));
+    test(S("1234567890"), SV("12345678901234567890"), S("123456789012345678901234567890"));
+
+    test(S("12345678901234567890"), SV(), S("12345678901234567890"));
+    test(S("12345678901234567890"), SV("12345"), S("1234567890123456789012345"));
+    test(S("12345678901234567890"), SV("1234567890"), S("123456789012345678901234567890"));
+    test(S("12345678901234567890"), SV("12345678901234567890"),
+         S("1234567890123456789012345678901234567890"));
+    }
+#if TEST_STD_VER >= 11
+    {
+    typedef std::basic_string     <char, std::char_traits<char>, min_allocator<char>> S;
+    typedef std::basic_string_view<char, std::char_traits<char> > SV;
+    test(S(), SV(), S());
+    test(S(), SV("12345"), S("12345"));
+    test(S(), SV("1234567890"), S("1234567890"));
+    test(S(), SV("12345678901234567890"), S("12345678901234567890"));
+
+    test(S("12345"), SV(), S("12345"));
+    test(S("12345"), SV("12345"), S("1234512345"));
+    test(S("12345"), SV("1234567890"), S("123451234567890"));
+    test(S("12345"), SV("12345678901234567890"), S("1234512345678901234567890"));
+
+    test(S("1234567890"), SV(), S("1234567890"));
+    test(S("1234567890"), SV("12345"), S("123456789012345"));
+    test(S("1234567890"), SV("1234567890"), S("12345678901234567890"));
+    test(S("1234567890"), SV("12345678901234567890"), S("123456789012345678901234567890"));
+
+    test(S("12345678901234567890"), SV(), S("12345678901234567890"));
+    test(S("12345678901234567890"), SV("12345"), S("1234567890123456789012345"));
+    test(S("12345678901234567890"), SV("1234567890"), S("123456789012345678901234567890"));
+    test(S("12345678901234567890"), SV("12345678901234567890"),
+         S("1234567890123456789012345678901234567890"));
+    }
+#endif
+}

test/std/strings/basic.string/string.modifiers/string_append/string_view_size_size.pass.cpp

@@ -0,0 +1,124 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// XFAIL: libcpp-no-exceptions
+// <string>
+
+// basic_string<charT,traits,Allocator>&
+//   append(basic_string_view<charT,traits> sv, size_type pos, size_type n = npos);
+//  the "= npos" was added for C++14
+
+#include <string>
+#include <string>
+#include <stdexcept>
+#include <cassert>
+
+#include "test_macros.h"
+#include "min_allocator.h"
+
+template <class S, class SV>
+void
+test(S s, SV sv, typename S::size_type pos, typename S::size_type n, S expected)
+{
+    try
+    {
+        s.append(sv, pos, n);
+        LIBCPP_ASSERT(s.__invariants());
+        assert(pos <= sv.size());
+        assert(s == expected);
+    }
+    catch (std::out_of_range&)
+    {
+        assert(pos > sv.size());
+    }
+}
+
+template <class S, class SV>
+void
+test_npos(S s, SV sv, typename S::size_type pos, S expected)
+{
+    try
+    {
+        s.append(sv, pos);
+        LIBCPP_ASSERT(s.__invariants());
+        assert(pos <= sv.size());
+        assert(s == expected);
+    }
+    catch (std::out_of_range&)
+    {
+        assert(pos > sv.size());
+    }
+}
+
+int main()
+{
+    {
+    typedef std::string S;
+    typedef std::string_view SV;
+    test(S(), SV(), 0, 0, S());
+    test(S(), SV(), 1, 0, S());
+    test(S(), SV("12345"), 0, 3, S("123"));
+    test(S(), SV("12345"), 1, 4, S("2345"));
+    test(S(), SV("12345"), 3, 15, S("45"));
+    test(S(), SV("12345"), 5, 15, S(""));
+    test(S(), SV("12345"), 6, 15, S("not happening"));
+    test(S(), SV("12345678901234567890"), 0, 0, S());
+    test(S(), SV("12345678901234567890"), 1, 1, S("2"));
+    test(S(), SV("12345678901234567890"), 2, 3, S("345"));
+    test(S(), SV("12345678901234567890"), 12, 13, S("34567890"));
+    test(S(), SV("12345678901234567890"), 21, 13, S("not happening"));
+
+    test(S("12345"), SV(), 0, 0, S("12345"));
+    test(S("12345"), SV("12345"), 2, 2, S("1234534"));
+    test(S("12345"), SV("1234567890"), 0, 100, S("123451234567890"));
+
+    test(S("12345678901234567890"), SV(), 0, 0, S("12345678901234567890"));
+    test(S("12345678901234567890"), SV("12345"), 1, 3, S("12345678901234567890234"));
+    test(S("12345678901234567890"), SV("12345678901234567890"), 5, 10,
+         S("123456789012345678906789012345"));
+    }
+#if TEST_STD_VER >= 11
+    {
+    typedef std::basic_string     <char, std::char_traits<char>, min_allocator<char>> S;
+    typedef std::basic_string_view<char, std::char_traits<char> > SV;
+    test(S(), SV(), 0, 0, S());
+    test(S(), SV(), 1, 0, S());
+    test(S(), SV("12345"), 0, 3, S("123"));
+    test(S(), SV("12345"), 1, 4, S("2345"));
+    test(S(), SV("12345"), 3, 15, S("45"));
+    test(S(), SV("12345"), 5, 15, S(""));
+    test(S(), SV("12345"), 6, 15, S("not happening"));
+    test(S(), SV("12345678901234567890"), 0, 0, S());
+    test(S(), SV("12345678901234567890"), 1, 1, S("2"));
+    test(S(), SV("12345678901234567890"), 2, 3, S("345"));
+    test(S(), SV("12345678901234567890"), 12, 13, S("34567890"));
+    test(S(), SV("12345678901234567890"), 21, 13, S("not happening"));
+
+    test(S("12345"), SV(), 0, 0, S("12345"));
+    test(S("12345"), SV("12345"), 2, 2, S("1234534"));
+    test(S("12345"), SV("1234567890"), 0, 100, S("123451234567890"));
+
+    test(S("12345678901234567890"), SV(), 0, 0, S("12345678901234567890"));
+    test(S("12345678901234567890"), SV("12345"), 1, 3, S("12345678901234567890234"));
+    test(S("12345678901234567890"), SV("12345678901234567890"), 5, 10,
+         S("123456789012345678906789012345"));
+    }
+#endif
+    {
+    typedef std::string S;
+    typedef std::string_view SV;
+    test_npos(S(), SV(), 0, S());
+    test_npos(S(), SV(), 1, S());
+    test_npos(S(), SV("12345"), 0, S("12345"));
+    test_npos(S(), SV("12345"), 1, S("2345"));
+    test_npos(S(), SV("12345"), 3, S("45"));
+    test_npos(S(), SV("12345"), 5, S(""));
+    test_npos(S(), SV("12345"), 6, S("not happening"));
+    }
+}

test/std/strings/basic.string/string.modifiers/string_assign/string_view.pass.cpp

@@ -0,0 +1,105 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// basic_string<charT,traits,Allocator>&
+//   assign(basic_string_view<charT,traits> sv);
+
+#include <string>
+#include <string_view>
+#include <cassert>
+
+#include "test_macros.h"
+#include "min_allocator.h"
+#include "test_allocator.h"
+
+template <class S, class SV>
+void
+test(S s, SV sv, S expected)
+{
+    s.assign(sv);
+    LIBCPP_ASSERT(s.__invariants());
+    assert(s == expected);
+}
+
+template <class S, class SV>
+void
+testAlloc(S s, SV sv, const typename S::allocator_type& a)
+{
+    s.assign(sv);
+    LIBCPP_ASSERT(s.__invariants());
+    assert(s == sv);
+    assert(s.get_allocator() == a);
+}
+
+int main()
+{
+    {
+    typedef std::string S;
+    typedef std::string_view SV;
+    test(S(), SV(), S());
+    test(S(), SV("12345"), S("12345"));
+    test(S(), SV("1234567890"), S("1234567890"));
+    test(S(), SV("12345678901234567890"), S("12345678901234567890"));
+
+    test(S("12345"), SV(), S());
+    test(S("12345"), SV("12345"), S("12345"));
+    test(S("12345"), SV("1234567890"), S("1234567890"));
+    test(S("12345"), SV("12345678901234567890"), S("12345678901234567890"));
+
+    test(S("1234567890"), SV(), S());
+    test(S("1234567890"), SV("12345"), S("12345"));
+    test(S("1234567890"), SV("1234567890"), S("1234567890"));
+    test(S("1234567890"), SV("12345678901234567890"), S("12345678901234567890"));
+
+    test(S("12345678901234567890"), SV(), S());
+    test(S("12345678901234567890"), SV("12345"), S("12345"));
+    test(S("12345678901234567890"), SV("1234567890"), S("1234567890"));
+    test(S("12345678901234567890"), SV("12345678901234567890"),
+         S("12345678901234567890"));
+
+    testAlloc(S(), SV(), std::allocator<char>());
+    testAlloc(S(), SV("12345"), std::allocator<char>());
+    testAlloc(S(), SV("1234567890"), std::allocator<char>());
+    testAlloc(S(), SV("12345678901234567890"), std::allocator<char>());
+    }
+
+#if TEST_STD_VER >= 11
+    {
+    typedef std::basic_string     <char, std::char_traits<char>, min_allocator<char>> S;
+    typedef std::basic_string_view<char, std::char_traits<char> > SV;
+    test(S(), SV(), S());
+    test(S(), SV("12345"), S("12345"));
+    test(S(), SV("1234567890"), S("1234567890"));
+    test(S(), SV("12345678901234567890"), S("12345678901234567890"));
+
+    test(S("12345"), SV(), S());
+    test(S("12345"), SV("12345"), S("12345"));
+    test(S("12345"), SV("1234567890"), S("1234567890"));
+    test(S("12345"), SV("12345678901234567890"), S("12345678901234567890"));
+
+    test(S("1234567890"), SV(), S());
+    test(S("1234567890"), SV("12345"), S("12345"));
+    test(S("1234567890"), SV("1234567890"), S("1234567890"));
+    test(S("1234567890"), SV("12345678901234567890"), S("12345678901234567890"));
+
+    test(S("12345678901234567890"), SV(), S());
+    test(S("12345678901234567890"), SV("12345"), S("12345"));
+    test(S("12345678901234567890"), SV("1234567890"), S("1234567890"));
+    test(S("12345678901234567890"), SV("12345678901234567890"),
+         S("12345678901234567890"));
+
+    testAlloc(S(), SV(), min_allocator<char>());
+    testAlloc(S(), SV("12345"), min_allocator<char>());
+    testAlloc(S(), SV("1234567890"), min_allocator<char>());
+    testAlloc(S(), SV("12345678901234567890"), min_allocator<char>());
+    }
+#endif
+}

test/std/strings/basic.string/string.modifiers/string_assign/string_view_size_size.pass.cpp

@@ -0,0 +1,123 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// XFAIL: libcpp-no-exceptions
+// <string>
+
+// basic_string<charT,traits,Allocator>&
+//   assign(basic_string_view<charT,traits> sv, size_type pos, size_type n=npos);
+// the =npos was added for C++14
+
+#include <string>
+#include <stdexcept>
+#include <cassert>
+
+#include "test_macros.h"
+#include "min_allocator.h"
+
+template <class S, class SV>
+void
+test(S s, SV sv, typename S::size_type pos, typename S::size_type n, S expected)
+{
+    try
+    {
+        s.assign(sv, pos, n);
+        LIBCPP_ASSERT(s.__invariants());
+        assert(pos <= sv.size());
+        assert(s == expected);
+    }
+    catch (std::out_of_range&)
+    {
+        assert(pos > sv.size());
+    }
+}
+
+template <class S, class SV>
+void
+test_npos(S s, SV sv, typename S::size_type pos, S expected)
+{
+    try
+    {
+        s.assign(sv, pos);
+        LIBCPP_ASSERT(s.__invariants());
+        assert(pos <= sv.size());
+        assert(s == expected);
+    }
+    catch (std::out_of_range&)
+    {
+        assert(pos > sv.size());
+    }
+}
+
+int main()
+{
+    {
+    typedef std::string S;
+    typedef std::string_view SV;
+    test(S(), SV(), 0, 0, S());
+    test(S(), SV(), 1, 0, S());
+    test(S(), SV("12345"), 0, 3, S("123"));
+    test(S(), SV("12345"), 1, 4, S("2345"));
+    test(S(), SV("12345"), 3, 15, S("45"));
+    test(S(), SV("12345"), 5, 15, S(""));
+    test(S(), SV("12345"), 6, 15, S("not happening"));
+    test(S(), SV("12345678901234567890"), 0, 0, S());
+    test(S(), SV("12345678901234567890"), 1, 1, S("2"));
+    test(S(), SV("12345678901234567890"), 2, 3, S("345"));
+    test(S(), SV("12345678901234567890"), 12, 13, S("34567890"));
+    test(S(), SV("12345678901234567890"), 21, 13, S("not happening"));
+
+    test(S("12345"), SV(), 0, 0, S());
+    test(S("12345"), SV("12345"), 2, 2, S("34"));
+    test(S("12345"), SV("1234567890"), 0, 100, S("1234567890"));
+
+    test(S("12345678901234567890"), SV(), 0, 0, S());
+    test(S("12345678901234567890"), SV("12345"), 1, 3, S("234"));
+    test(S("12345678901234567890"), SV("12345678901234567890"), 5, 10,
+         S("6789012345"));
+    }
+#if TEST_STD_VER >= 11
+    {
+    typedef std::basic_string     <char, std::char_traits<char>, min_allocator<char>> S;
+    typedef std::basic_string_view<char, std::char_traits<char> > SV;
+    test(S(), SV(), 0, 0, S());
+    test(S(), SV(), 1, 0, S());
+    test(S(), SV("12345"), 0, 3, S("123"));
+    test(S(), SV("12345"), 1, 4, S("2345"));
+    test(S(), SV("12345"), 3, 15, S("45"));
+    test(S(), SV("12345"), 5, 15, S(""));
+    test(S(), SV("12345"), 6, 15, S("not happening"));
+    test(S(), SV("12345678901234567890"), 0, 0, S());
+    test(S(), SV("12345678901234567890"), 1, 1, S("2"));
+    test(S(), SV("12345678901234567890"), 2, 3, S("345"));
+    test(S(), SV("12345678901234567890"), 12, 13, S("34567890"));
+    test(S(), SV("12345678901234567890"), 21, 13, S("not happening"));
+
+    test(S("12345"), SV(), 0, 0, S());
+    test(S("12345"), SV("12345"), 2, 2, S("34"));
+    test(S("12345"), SV("1234567890"), 0, 100, S("1234567890"));
+
+    test(S("12345678901234567890"), SV(), 0, 0, S());
+    test(S("12345678901234567890"), SV("12345"), 1, 3, S("234"));
+    test(S("12345678901234567890"), SV("12345678901234567890"), 5, 10,
+         S("6789012345"));
+    }
+#endif
+    {
+    typedef std::string S;
+    typedef std::string_view SV;
+    test_npos(S(), SV(), 0, S());
+    test_npos(S(), SV(), 1, S());
+    test_npos(S(), SV("12345"), 0, S("12345"));
+    test_npos(S(), SV("12345"), 1, S("2345"));
+    test_npos(S(), SV("12345"), 3, S("45"));
+    test_npos(S(), SV("12345"), 5, S(""));
+    test_npos(S(), SV("12345"), 6, S("not happening"));
+    }
+}

test/std/strings/basic.string/string.nonmembers/string_op!=/string_string_view.pass.cpp

@@ -0,0 +1,70 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// we get this comparison "for free" because the string implicitly converts to the string_view
+
+#include <string>
+#include <cassert>
+
+#include "min_allocator.h"
+
+template <class S, class SV>
+void
+test(const S& lhs, SV rhs, bool x)
+{
+    assert((lhs != rhs) == x);
+}
+
+int main()
+{
+    {
+    typedef std::string S;
+    typedef std::string SV;
+    test(S(""), SV(""), false);
+    test(S(""), SV("abcde"), true);
+    test(S(""), SV("abcdefghij"), true);
+    test(S(""), SV("abcdefghijklmnopqrst"), true);
+    test(S("abcde"), SV(""), true);
+    test(S("abcde"), SV("abcde"), false);
+    test(S("abcde"), SV("abcdefghij"), true);
+    test(S("abcde"), SV("abcdefghijklmnopqrst"), true);
+    test(S("abcdefghij"), SV(""), true);
+    test(S("abcdefghij"), SV("abcde"), true);
+    test(S("abcdefghij"), SV("abcdefghij"), false);
+    test(S("abcdefghij"), SV("abcdefghijklmnopqrst"), true);
+    test(S("abcdefghijklmnopqrst"), SV(""), true);
+    test(S("abcdefghijklmnopqrst"), SV("abcde"), true);
+    test(S("abcdefghijklmnopqrst"), SV("abcdefghij"), true);
+    test(S("abcdefghijklmnopqrst"), SV("abcdefghijklmnopqrst"), false);
+    }
+#if TEST_STD_VER >= 11
+    {
+    typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
+    typedef std::basic_string_view<char, std::char_traits<char>> SV;
+    test(S(""), SV(""), false);
+    test(S(""), SV("abcde"), true);
+    test(S(""), SV("abcdefghij"), true);
+    test(S(""), SV("abcdefghijklmnopqrst"), true);
+    test(S("abcde"), SV(""), true);
+    test(S("abcde"), SV("abcde"), false);
+    test(S("abcde"), SV("abcdefghij"), true);
+    test(S("abcde"), SV("abcdefghijklmnopqrst"), true);
+    test(S("abcdefghij"), SV(""), true);
+    test(S("abcdefghij"), SV("abcde"), true);
+    test(S("abcdefghij"), SV("abcdefghij"), false);
+    test(S("abcdefghij"), SV("abcdefghijklmnopqrst"), true);
+    test(S("abcdefghijklmnopqrst"), SV(""), true);
+    test(S("abcdefghijklmnopqrst"), SV("abcde"), true);
+    test(S("abcdefghijklmnopqrst"), SV("abcdefghij"), true);
+    test(S("abcdefghijklmnopqrst"), SV("abcdefghijklmnopqrst"), false);
+    }
+#endif
+}

test/std/strings/basic.string/string.nonmembers/string_op!=/string_view_string.pass.cpp

@@ -0,0 +1,70 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// we get this comparison "for free" because the string implicitly converts to the string_view
+
+#include <string>
+#include <cassert>
+
+#include "min_allocator.h"
+
+template <class S, class SV>
+void
+test(SV lhs, const S& rhs, bool x)
+{
+    assert((lhs != rhs) == x);
+}
+
+int main()
+{
+    {
+    typedef std::string S;
+    typedef std::string_view SV;
+    test(SV(""), S(""), false);
+    test(SV(""), S("abcde"), true);
+    test(SV(""), S("abcdefghij"), true);
+    test(SV(""), S("abcdefghijklmnopqrst"), true);
+    test(SV("abcde"), S(""), true);
+    test(SV("abcde"), S("abcde"), false);
+    test(SV("abcde"), S("abcdefghij"), true);
+    test(SV("abcde"), S("abcdefghijklmnopqrst"), true);
+    test(SV("abcdefghij"), S(""), true);
+    test(SV("abcdefghij"), S("abcde"), true);
+    test(SV("abcdefghij"), S("abcdefghij"), false);
+    test(SV("abcdefghij"), S("abcdefghijklmnopqrst"), true);
+    test(SV("abcdefghijklmnopqrst"), S(""), true);
+    test(SV("abcdefghijklmnopqrst"), S("abcde"), true);
+    test(SV("abcdefghijklmnopqrst"), S("abcdefghij"), true);
+    test(SV("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), false);
+    }
+#if TEST_STD_VER >= 11
+    {
+    typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
+    typedef std::basic_string_view<char, std::char_traits<char>> SV;
+    test(SV(""), S(""), false);
+    test(SV(""), S("abcde"), true);
+    test(SV(""), S("abcdefghij"), true);
+    test(SV(""), S("abcdefghijklmnopqrst"), true);
+    test(SV("abcde"), S(""), true);
+    test(SV("abcde"), S("abcde"), false);
+    test(SV("abcde"), S("abcdefghij"), true);
+    test(SV("abcde"), S("abcdefghijklmnopqrst"), true);
+    test(SV("abcdefghij"), S(""), true);
+    test(SV("abcdefghij"), S("abcde"), true);
+    test(SV("abcdefghij"), S("abcdefghij"), false);
+    test(SV("abcdefghij"), S("abcdefghijklmnopqrst"), true);
+    test(SV("abcdefghijklmnopqrst"), S(""), true);
+    test(SV("abcdefghijklmnopqrst"), S("abcde"), true);
+    test(SV("abcdefghijklmnopqrst"), S("abcdefghij"), true);
+    test(SV("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), false);
+    }
+#endif
+}

test/std/strings/basic.string/string.nonmembers/string_operator==/string_string_view.pass.cpp

@@ -0,0 +1,70 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// we get this comparison "for free" because the string implicitly converts to the string_view
+                 
+#include <string>
+#include <cassert>
+
+#include "min_allocator.h"
+
+template <class S, class SV>
+void
+test(const S& lhs, SV rhs, bool x)
+{
+    assert((lhs == rhs) == x);
+}
+
+int main()
+{
+    {
+    typedef std::string S;
+    typedef std::string_view SV;
+    test(S(""), SV(""), true);
+    test(S(""), SV("abcde"), false);
+    test(S(""), SV("abcdefghij"), false);
+    test(S(""), SV("abcdefghijklmnopqrst"), false);
+    test(S("abcde"), SV(""), false);
+    test(S("abcde"), SV("abcde"), true);
+    test(S("abcde"), SV("abcdefghij"), false);
+    test(S("abcde"), SV("abcdefghijklmnopqrst"), false);
+    test(S("abcdefghij"), SV(""), false);
+    test(S("abcdefghij"), SV("abcde"), false);
+    test(S("abcdefghij"), SV("abcdefghij"), true);
+    test(S("abcdefghij"), SV("abcdefghijklmnopqrst"), false);
+    test(S("abcdefghijklmnopqrst"), SV(""), false);
+    test(S("abcdefghijklmnopqrst"), SV("abcde"), false);
+    test(S("abcdefghijklmnopqrst"), SV("abcdefghij"), false);
+    test(S("abcdefghijklmnopqrst"), SV("abcdefghijklmnopqrst"), true);
+    }
+#if TEST_STD_VER >= 11
+    {
+    typedef std::basic_string     <char, std::char_traits<char>, min_allocator<char>> S;
+    typedef std::basic_string_view<char, std::char_traits<char>> SV;
+    test(S(""), SV(""), true);
+    test(S(""), SV("abcde"), false);
+    test(S(""), SV("abcdefghij"), false);
+    test(S(""), SV("abcdefghijklmnopqrst"), false);
+    test(S("abcde"), SV(""), false);
+    test(S("abcde"), SV("abcde"), true);
+    test(S("abcde"), SV("abcdefghij"), false);
+    test(S("abcde"), SV("abcdefghijklmnopqrst"), false);
+    test(S("abcdefghij"), SV(""), false);
+    test(S("abcdefghij"), SV("abcde"), false);
+    test(S("abcdefghij"), SV("abcdefghij"), true);
+    test(S("abcdefghij"), SV("abcdefghijklmnopqrst"), false);
+    test(S("abcdefghijklmnopqrst"), SV(""), false);
+    test(S("abcdefghijklmnopqrst"), SV("abcde"), false);
+    test(S("abcdefghijklmnopqrst"), SV("abcdefghij"), false);
+    test(S("abcdefghijklmnopqrst"), SV("abcdefghijklmnopqrst"), true);
+    }
+#endif
+}

test/std/strings/basic.string/string.nonmembers/string_operator==/string_view_string.pass.cpp

@@ -0,0 +1,70 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// we get this comparison "for free" because the string implicitly converts to the string_view
+
+#include <string>
+#include <cassert>
+
+#include "min_allocator.h"
+
+template <class S, class SV>
+void
+test(SV lhs, const S& rhs, bool x)
+{
+    assert((lhs == rhs) == x);
+}
+
+int main()
+{
+    {
+    typedef std::string S;
+    typedef std::string_view SV;
+    test(SV(""), S(""), true);
+    test(SV(""), S("abcde"), false);
+    test(SV(""), S("abcdefghij"), false);
+    test(SV(""), S("abcdefghijklmnopqrst"), false);
+    test(SV("abcde"), S(""), false);
+    test(SV("abcde"), S("abcde"), true);
+    test(SV("abcde"), S("abcdefghij"), false);
+    test(SV("abcde"), S("abcdefghijklmnopqrst"), false);
+    test(SV("abcdefghij"), S(""), false);
+    test(SV("abcdefghij"), S("abcde"), false);
+    test(SV("abcdefghij"), S("abcdefghij"), true);
+    test(SV("abcdefghij"), S("abcdefghijklmnopqrst"), false);
+    test(SV("abcdefghijklmnopqrst"), S(""), false);
+    test(SV("abcdefghijklmnopqrst"), S("abcde"), false);
+    test(SV("abcdefghijklmnopqrst"), S("abcdefghij"), false);
+    test(SV("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), true);
+    }
+#if TEST_STD_VER >= 11
+    {
+    typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
+    typedef std::basic_string_view<char, std::char_traits<char>> SV;
+    test(SV(""), S(""), true);
+    test(SV(""), S("abcde"), false);
+    test(SV(""), S("abcdefghij"), false);
+    test(SV(""), S("abcdefghijklmnopqrst"), false);
+    test(SV("abcde"), S(""), false);
+    test(SV("abcde"), S("abcde"), true);
+    test(SV("abcde"), S("abcdefghij"), false);
+    test(SV("abcde"), S("abcdefghijklmnopqrst"), false);
+    test(SV("abcdefghij"), S(""), false);
+    test(SV("abcdefghij"), S("abcde"), false);
+    test(SV("abcdefghij"), S("abcdefghij"), true);
+    test(SV("abcdefghij"), S("abcdefghijklmnopqrst"), false);
+    test(SV("abcdefghijklmnopqrst"), S(""), false);
+    test(SV("abcdefghijklmnopqrst"), S("abcde"), false);
+    test(SV("abcdefghijklmnopqrst"), S("abcdefghij"), false);
+    test(SV("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), true);
+    }
+#endif
+}

test/std/strings/basic.string/string.nonmembers/string_opgt/string_string_view.pass.cpp

@@ -0,0 +1,70 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// we get this comparison "for free" because the string implicitly converts to the string_view
+
+#include <string>
+#include <cassert>
+
+#include "min_allocator.h"
+
+template <class S, class SV>
+void
+test(const S& lhs, SV rhs, bool x)
+{
+    assert((lhs > rhs) == x);
+}
+
+int main()
+{
+    {
+    typedef std::string S;
+    typedef std::string_view SV;
+    test(S(""), SV(""), false);
+    test(S(""), SV("abcde"), false);
+    test(S(""), SV("abcdefghij"), false);
+    test(S(""), SV("abcdefghijklmnopqrst"), false);
+    test(S("abcde"), SV(""), true);
+    test(S("abcde"), SV("abcde"), false);
+    test(S("abcde"), SV("abcdefghij"), false);
+    test(S("abcde"), SV("abcdefghijklmnopqrst"), false);
+    test(S("abcdefghij"), SV(""), true);
+    test(S("abcdefghij"), SV("abcde"), true);
+    test(S("abcdefghij"), SV("abcdefghij"), false);
+    test(S("abcdefghij"), SV("abcdefghijklmnopqrst"), false);
+    test(S("abcdefghijklmnopqrst"), SV(""), true);
+    test(S("abcdefghijklmnopqrst"), SV("abcde"), true);
+    test(S("abcdefghijklmnopqrst"), SV("abcdefghij"), true);
+    test(S("abcdefghijklmnopqrst"), SV("abcdefghijklmnopqrst"), false);
+    }
+#if TEST_STD_VER >= 11
+    {
+    typedef std::basic_string     <char, std::char_traits<char>, min_allocator<char>> S;
+    typedef std::basic_string_view<char, std::char_traits<char>> SV;
+    test(S(""), SV(""), false);
+    test(S(""), SV("abcde"), false);
+    test(S(""), SV("abcdefghij"), false);
+    test(S(""), SV("abcdefghijklmnopqrst"), false);
+    test(S("abcde"), SV(""), true);
+    test(S("abcde"), SV("abcde"), false);
+    test(S("abcde"), SV("abcdefghij"), false);
+    test(S("abcde"), SV("abcdefghijklmnopqrst"), false);
+    test(S("abcdefghij"), SV(""), true);
+    test(S("abcdefghij"), SV("abcde"), true);
+    test(S("abcdefghij"), SV("abcdefghij"), false);
+    test(S("abcdefghij"), SV("abcdefghijklmnopqrst"), false);
+    test(S("abcdefghijklmnopqrst"), SV(""), true);
+    test(S("abcdefghijklmnopqrst"), SV("abcde"), true);
+    test(S("abcdefghijklmnopqrst"), SV("abcdefghij"), true);
+    test(S("abcdefghijklmnopqrst"), SV("abcdefghijklmnopqrst"), false);
+    }
+#endif
+}

test/std/strings/basic.string/string.nonmembers/string_opgt/string_view_string.pass.cpp

@@ -0,0 +1,70 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// we get this comparison "for free" because the string implicitly converts to the string_view
+
+#include <string>
+#include <cassert>
+
+#include "min_allocator.h"
+
+template <class S, class SV>
+void
+test(SV lhs, const S& rhs, bool x)
+{
+    assert((lhs > rhs) == x);
+}
+
+int main()
+{
+    {
+    typedef std::string S;
+    typedef std::string_view SV;
+    test(SV(""), S(""), false);
+    test(SV(""), S("abcde"), false);
+    test(SV(""), S("abcdefghij"), false);
+    test(SV(""), S("abcdefghijklmnopqrst"), false);
+    test(SV("abcde"), S(""), true);
+    test(SV("abcde"), S("abcde"), false);
+    test(SV("abcde"), S("abcdefghij"), false);
+    test(SV("abcde"), S("abcdefghijklmnopqrst"), false);
+    test(SV("abcdefghij"), S(""), true);
+    test(SV("abcdefghij"), S("abcde"), true);
+    test(SV("abcdefghij"), S("abcdefghij"), false);
+    test(SV("abcdefghij"), S("abcdefghijklmnopqrst"), false);
+    test(SV("abcdefghijklmnopqrst"), S(""), true);
+    test(SV("abcdefghijklmnopqrst"), S("abcde"), true);
+    test(SV("abcdefghijklmnopqrst"), S("abcdefghij"), true);
+    test(SV("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), false);
+    }
+#if TEST_STD_VER >= 11
+    {
+    typedef std::basic_string     <char, std::char_traits<char>, min_allocator<char>> S;
+    typedef std::basic_string_view<char, std::char_traits<char>> SV;
+    test(SV(""), S(""), false);
+    test(SV(""), S("abcde"), false);
+    test(SV(""), S("abcdefghij"), false);
+    test(SV(""), S("abcdefghijklmnopqrst"), false);
+    test(SV("abcde"), S(""), true);
+    test(SV("abcde"), S("abcde"), false);
+    test(SV("abcde"), S("abcdefghij"), false);
+    test(SV("abcde"), S("abcdefghijklmnopqrst"), false);
+    test(SV("abcdefghij"), S(""), true);
+    test(SV("abcdefghij"), S("abcde"), true);
+    test(SV("abcdefghij"), S("abcdefghij"), false);
+    test(SV("abcdefghij"), S("abcdefghijklmnopqrst"), false);
+    test(SV("abcdefghijklmnopqrst"), S(""), true);
+    test(SV("abcdefghijklmnopqrst"), S("abcde"), true);
+    test(SV("abcdefghijklmnopqrst"), S("abcdefghij"), true);
+    test(SV("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), false);
+    }
+#endif
+}

test/std/strings/basic.string/string.nonmembers/string_opgt=/string_string_view.pass.cpp

@@ -0,0 +1,70 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// we get this comparison "for free" because the string implicitly converts to the string_view
+
+#include <string>
+#include <cassert>
+
+#include "min_allocator.h"
+
+template <class S, class SV>
+void
+test(const S& lhs, SV rhs, bool x)
+{
+    assert((lhs >= rhs) == x);
+}
+
+int main()
+{
+    {
+    typedef std::string S;
+    typedef std::string_view SV;
+    test(S(""), SV(""), true);
+    test(S(""), SV("abcde"), false);
+    test(S(""), SV("abcdefghij"), false);
+    test(S(""), SV("abcdefghijklmnopqrst"), false);
+    test(S("abcde"), SV(""), true);
+    test(S("abcde"), SV("abcde"), true);
+    test(S("abcde"), SV("abcdefghij"), false);
+    test(S("abcde"), SV("abcdefghijklmnopqrst"), false);
+    test(S("abcdefghij"), SV(""), true);
+    test(S("abcdefghij"), SV("abcde"), true);
+    test(S("abcdefghij"), SV("abcdefghij"), true);
+    test(S("abcdefghij"), SV("abcdefghijklmnopqrst"), false);
+    test(S("abcdefghijklmnopqrst"), SV(""), true);
+    test(S("abcdefghijklmnopqrst"), SV("abcde"), true);
+    test(S("abcdefghijklmnopqrst"), SV("abcdefghij"), true);
+    test(S("abcdefghijklmnopqrst"), SV("abcdefghijklmnopqrst"), true);
+    }
+#if TEST_STD_VER >= 11
+    {
+    typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
+    typedef std::basic_string_view<char, std::char_traits<char>> SV;
+    test(S(""), SV(""), true);
+    test(S(""), SV("abcde"), false);
+    test(S(""), SV("abcdefghij"), false);
+    test(S(""), SV("abcdefghijklmnopqrst"), false);
+    test(S("abcde"), SV(""), true);
+    test(S("abcde"), SV("abcde"), true);
+    test(S("abcde"), SV("abcdefghij"), false);
+    test(S("abcde"), SV("abcdefghijklmnopqrst"), false);
+    test(S("abcdefghij"), SV(""), true);
+    test(S("abcdefghij"), SV("abcde"), true);
+    test(S("abcdefghij"), SV("abcdefghij"), true);
+    test(S("abcdefghij"), SV("abcdefghijklmnopqrst"), false);
+    test(S("abcdefghijklmnopqrst"), SV(""), true);
+    test(S("abcdefghijklmnopqrst"), SV("abcde"), true);
+    test(S("abcdefghijklmnopqrst"), SV("abcdefghij"), true);
+    test(S("abcdefghijklmnopqrst"), SV("abcdefghijklmnopqrst"), true);
+    }
+#endif
+}

test/std/strings/basic.string/string.nonmembers/string_opgt=/string_view_string.pass.cpp

@@ -0,0 +1,70 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// we get this comparison "for free" because the string implicitly converts to the string_view
+
+#include <string>
+#include <cassert>
+
+#include "min_allocator.h"
+
+template <class S, class SV>
+void
+test(SV lhs, const S& rhs, bool x)
+{
+    assert((lhs >= rhs) == x);
+}
+
+int main()
+{
+    {
+    typedef std::string S;
+    typedef std::string_view SV;
+    test(SV(""), S(""), true);
+    test(SV(""), S("abcde"), false);
+    test(SV(""), S("abcdefghij"), false);
+    test(SV(""), S("abcdefghijklmnopqrst"), false);
+    test(SV("abcde"), S(""), true);
+    test(SV("abcde"), S("abcde"), true);
+    test(SV("abcde"), S("abcdefghij"), false);
+    test(SV("abcde"), S("abcdefghijklmnopqrst"), false);
+    test(SV("abcdefghij"), S(""), true);
+    test(SV("abcdefghij"), S("abcde"), true);
+    test(SV("abcdefghij"), S("abcdefghij"), true);
+    test(SV("abcdefghij"), S("abcdefghijklmnopqrst"), false);
+    test(SV("abcdefghijklmnopqrst"), S(""), true);
+    test(SV("abcdefghijklmnopqrst"), S("abcde"), true);
+    test(SV("abcdefghijklmnopqrst"), S("abcdefghij"), true);
+    test(SV("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), true);
+    }
+#if TEST_STD_VER >= 11
+    {
+    typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
+    typedef std::basic_string_view<char, std::char_traits<char>> SV;
+    test(SV(""), S(""), true);
+    test(SV(""), S("abcde"), false);
+    test(SV(""), S("abcdefghij"), false);
+    test(SV(""), S("abcdefghijklmnopqrst"), false);
+    test(SV("abcde"), S(""), true);
+    test(SV("abcde"), S("abcde"), true);
+    test(SV("abcde"), S("abcdefghij"), false);
+    test(SV("abcde"), S("abcdefghijklmnopqrst"), false);
+    test(SV("abcdefghij"), S(""), true);
+    test(SV("abcdefghij"), S("abcde"), true);
+    test(SV("abcdefghij"), S("abcdefghij"), true);
+    test(SV("abcdefghij"), S("abcdefghijklmnopqrst"), false);
+    test(SV("abcdefghijklmnopqrst"), S(""), true);
+    test(SV("abcdefghijklmnopqrst"), S("abcde"), true);
+    test(SV("abcdefghijklmnopqrst"), S("abcdefghij"), true);
+    test(SV("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), true);
+    }
+#endif
+}

test/std/strings/basic.string/string.nonmembers/string_oplt/string_string_view.pass.cpp

@@ -0,0 +1,70 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// we get this comparison "for free" because the string implicitly converts to the string_view
+
+#include <string>
+#include <cassert>
+
+#include "min_allocator.h"
+
+template <class S, class SV>
+void
+test(const S& lhs, SV rhs, bool x)
+{
+    assert((lhs < rhs) == x);
+}
+
+int main()
+{
+    {
+    typedef std::string S;
+    typedef std::string_view SV;
+    test(S(""), SV(""), false);
+    test(S(""), SV("abcde"), true);
+    test(S(""), SV("abcdefghij"), true);
+    test(S(""), SV("abcdefghijklmnopqrst"), true);
+    test(S("abcde"), SV(""), false);
+    test(S("abcde"), SV("abcde"), false);
+    test(S("abcde"), SV("abcdefghij"), true);
+    test(S("abcde"), SV("abcdefghijklmnopqrst"), true);
+    test(S("abcdefghij"), SV(""), false);
+    test(S("abcdefghij"), SV("abcde"), false);
+    test(S("abcdefghij"), SV("abcdefghij"), false);
+    test(S("abcdefghij"), SV("abcdefghijklmnopqrst"), true);
+    test(S("abcdefghijklmnopqrst"), SV(""), false);
+    test(S("abcdefghijklmnopqrst"), SV("abcde"), false);
+    test(S("abcdefghijklmnopqrst"), SV("abcdefghij"), false);
+    test(S("abcdefghijklmnopqrst"), SV("abcdefghijklmnopqrst"), false);
+    }
+#if TEST_STD_VER >= 11
+    {
+    typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
+    typedef std::basic_string_view<char, std::char_traits<char>> SV;
+    test(S(""), SV(""), false);
+    test(S(""), SV("abcde"), true);
+    test(S(""), SV("abcdefghij"), true);
+    test(S(""), SV("abcdefghijklmnopqrst"), true);
+    test(S("abcde"), SV(""), false);
+    test(S("abcde"), SV("abcde"), false);
+    test(S("abcde"), SV("abcdefghij"), true);
+    test(S("abcde"), SV("abcdefghijklmnopqrst"), true);
+    test(S("abcdefghij"), SV(""), false);
+    test(S("abcdefghij"), SV("abcde"), false);
+    test(S("abcdefghij"), SV("abcdefghij"), false);
+    test(S("abcdefghij"), SV("abcdefghijklmnopqrst"), true);
+    test(S("abcdefghijklmnopqrst"), SV(""), false);
+    test(S("abcdefghijklmnopqrst"), SV("abcde"), false);
+    test(S("abcdefghijklmnopqrst"), SV("abcdefghij"), false);
+    test(S("abcdefghijklmnopqrst"), SV("abcdefghijklmnopqrst"), false);
+    }
+#endif
+}

test/std/strings/basic.string/string.nonmembers/string_oplt/string_view_string.pass.cpp

@@ -0,0 +1,70 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// we get this comparison "for free" because the string implicitly converts to the string_view
+
+#include <string>
+#include <cassert>
+
+#include "min_allocator.h"
+
+template <class S, class SV>
+void
+test(SV lhs, const S& rhs, bool x)
+{
+    assert((lhs < rhs) == x);
+}
+
+int main()
+{
+    {
+    typedef std::string S;
+    typedef std::string_view SV;
+    test(SV(""), S(""), false);
+    test(SV(""), S("abcde"), true);
+    test(SV(""), S("abcdefghij"), true);
+    test(SV(""), S("abcdefghijklmnopqrst"), true);
+    test(SV("abcde"), S(""), false);
+    test(SV("abcde"), S("abcde"), false);
+    test(SV("abcde"), S("abcdefghij"), true);
+    test(SV("abcde"), S("abcdefghijklmnopqrst"), true);
+    test(SV("abcdefghij"), S(""), false);
+    test(SV("abcdefghij"), S("abcde"), false);
+    test(SV("abcdefghij"), S("abcdefghij"), false);
+    test(SV("abcdefghij"), S("abcdefghijklmnopqrst"), true);
+    test(SV("abcdefghijklmnopqrst"), S(""), false);
+    test(SV("abcdefghijklmnopqrst"), S("abcde"), false);
+    test(SV("abcdefghijklmnopqrst"), S("abcdefghij"), false);
+    test(SV("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), false);
+    }
+#if TEST_STD_VER >= 11
+    {
+    typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
+    typedef std::basic_string_view<char, std::char_traits<char>> SV;
+    test(SV(""), S(""), false);
+    test(SV(""), S("abcde"), true);
+    test(SV(""), S("abcdefghij"), true);
+    test(SV(""), S("abcdefghijklmnopqrst"), true);
+    test(SV("abcde"), S(""), false);
+    test(SV("abcde"), S("abcde"), false);
+    test(SV("abcde"), S("abcdefghij"), true);
+    test(SV("abcde"), S("abcdefghijklmnopqrst"), true);
+    test(SV("abcdefghij"), S(""), false);
+    test(SV("abcdefghij"), S("abcde"), false);
+    test(SV("abcdefghij"), S("abcdefghij"), false);
+    test(SV("abcdefghij"), S("abcdefghijklmnopqrst"), true);
+    test(SV("abcdefghijklmnopqrst"), S(""), false);
+    test(SV("abcdefghijklmnopqrst"), S("abcde"), false);
+    test(SV("abcdefghijklmnopqrst"), S("abcdefghij"), false);
+    test(SV("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), false);
+    }
+#endif
+}

test/std/strings/basic.string/string.nonmembers/string_oplt=/string_string_view.pass.cpp

@@ -0,0 +1,70 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// we get this comparison "for free" because the string implicitly converts to the string_view
+
+#include <string>
+#include <cassert>
+
+#include "min_allocator.h"
+
+template <class S, class SV>
+void
+test(const S& lhs, SV rhs, bool x)
+{
+    assert((lhs <= rhs) == x);
+}
+
+int main()
+{
+    {
+    typedef std::string S;
+    typedef std::string_view SV;
+    test(S(""), SV(""), true);
+    test(S(""), SV("abcde"), true);
+    test(S(""), SV("abcdefghij"), true);
+    test(S(""), SV("abcdefghijklmnopqrst"), true);
+    test(S("abcde"), SV(""), false);
+    test(S("abcde"), SV("abcde"), true);
+    test(S("abcde"), SV("abcdefghij"), true);
+    test(S("abcde"), SV("abcdefghijklmnopqrst"), true);
+    test(S("abcdefghij"), SV(""), false);
+    test(S("abcdefghij"), SV("abcde"), false);
+    test(S("abcdefghij"), SV("abcdefghij"), true);
+    test(S("abcdefghij"), SV("abcdefghijklmnopqrst"), true);
+    test(S("abcdefghijklmnopqrst"), SV(""), false);
+    test(S("abcdefghijklmnopqrst"), SV("abcde"), false);
+    test(S("abcdefghijklmnopqrst"), SV("abcdefghij"), false);
+    test(S("abcdefghijklmnopqrst"), SV("abcdefghijklmnopqrst"), true);
+    }
+#if TEST_STD_VER >= 11
+    {
+    typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
+    typedef std::basic_string_view<char, std::char_traits<char>> SV;
+    test(S(""), SV(""), true);
+    test(S(""), SV("abcde"), true);
+    test(S(""), SV("abcdefghij"), true);
+    test(S(""), SV("abcdefghijklmnopqrst"), true);
+    test(S("abcde"), SV(""), false);
+    test(S("abcde"), SV("abcde"), true);
+    test(S("abcde"), SV("abcdefghij"), true);
+    test(S("abcde"), SV("abcdefghijklmnopqrst"), true);
+    test(S("abcdefghij"), SV(""), false);
+    test(S("abcdefghij"), SV("abcde"), false);
+    test(S("abcdefghij"), SV("abcdefghij"), true);
+    test(S("abcdefghij"), SV("abcdefghijklmnopqrst"), true);
+    test(S("abcdefghijklmnopqrst"), SV(""), false);
+    test(S("abcdefghijklmnopqrst"), SV("abcde"), false);
+    test(S("abcdefghijklmnopqrst"), SV("abcdefghij"), false);
+    test(S("abcdefghijklmnopqrst"), SV("abcdefghijklmnopqrst"), true);
+    }
+#endif
+}

test/std/strings/basic.string/string.nonmembers/string_oplt=/string_view_string.pass.cpp

@@ -0,0 +1,70 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// we get this comparison "for free" because the string implicitly converts to the string_view
+
+#include <string>
+#include <cassert>
+
+#include "min_allocator.h"
+
+template <class S, class SV>
+void
+test(SV lhs, const S& rhs, bool x)
+{
+    assert((lhs <= rhs) == x);
+}
+
+int main()
+{
+    {
+    typedef std::string S;
+    typedef std::string_view SV;
+    test(SV(""), S(""), true);
+    test(SV(""), S("abcde"), true);
+    test(SV(""), S("abcdefghij"), true);
+    test(SV(""), S("abcdefghijklmnopqrst"), true);
+    test(SV("abcde"), S(""), false);
+    test(SV("abcde"), S("abcde"), true);
+    test(SV("abcde"), S("abcdefghij"), true);
+    test(SV("abcde"), S("abcdefghijklmnopqrst"), true);
+    test(SV("abcdefghij"), S(""), false);
+    test(SV("abcdefghij"), S("abcde"), false);
+    test(SV("abcdefghij"), S("abcdefghij"), true);
+    test(SV("abcdefghij"), S("abcdefghijklmnopqrst"), true);
+    test(SV("abcdefghijklmnopqrst"), S(""), false);
+    test(SV("abcdefghijklmnopqrst"), S("abcde"), false);
+    test(SV("abcdefghijklmnopqrst"), S("abcdefghij"), false);
+    test(SV("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), true);
+    }
+#if TEST_STD_VER >= 11
+    {
+    typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
+    typedef std::basic_string_view<char, std::char_traits<char>> SV;
+    test(SV(""), S(""), true);
+    test(SV(""), S("abcde"), true);
+    test(SV(""), S("abcdefghij"), true);
+    test(SV(""), S("abcdefghijklmnopqrst"), true);
+    test(SV("abcde"), S(""), false);
+    test(SV("abcde"), S("abcde"), true);
+    test(SV("abcde"), S("abcdefghij"), true);
+    test(SV("abcde"), S("abcdefghijklmnopqrst"), true);
+    test(SV("abcdefghij"), S(""), false);
+    test(SV("abcdefghij"), S("abcde"), false);
+    test(SV("abcdefghij"), S("abcdefghij"), true);
+    test(SV("abcdefghij"), S("abcdefghijklmnopqrst"), true);
+    test(SV("abcdefghijklmnopqrst"), S(""), false);
+    test(SV("abcdefghijklmnopqrst"), S("abcde"), false);
+    test(SV("abcdefghijklmnopqrst"), S("abcdefghij"), false);
+    test(SV("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), true);
+    }
+#endif
+}

test/std/strings/basic.string/string.ops/string_compare/size_size_string_size_size.pass.cpp

@@ -31,7 +31,7 @@ int sign(int x)
 
 template <class S>
 void
-test(const S& s, typename S::size_type pos1, typename S::size_type n1,
+test(const S& s,   typename S::size_type pos1, typename S::size_type n1,
      const S& str, typename S::size_type pos2, typename S::size_type n2, int x)
 {
     try
@@ -40,7 +40,7 @@ test(const S& s, typename S::size_type pos1, typename S::size_type n1,
         assert(pos1 <= s.size());
         assert(pos2 <= str.size());
     }
-    catch (std::out_of_range&)
+    catch (const std::out_of_range&)
     {
         assert(pos1 > s.size() || pos2 > str.size());
     }
@@ -48,8 +48,8 @@ test(const S& s, typename S::size_type pos1, typename S::size_type n1,
 
 template <class S>
 void
-test_npos(const S& s, typename S::size_type pos1, typename S::size_type n1,
-     const S& str, typename S::size_type pos2, int x)
+test_npos(const S& s,   typename S::size_type pos1, typename S::size_type n1,
+          const S& str, typename S::size_type pos2, int x)
 {
     try
     {
@@ -57,7 +57,7 @@ test_npos(const S& s, typename S::size_type pos1, typename S::size_type n1,
         assert(pos1 <= s.size());
         assert(pos2 <= str.size());
     }
-    catch (std::out_of_range&)
+    catch (const std::out_of_range&)
     {
         assert(pos1 > s.size() || pos2 > str.size());
     }

test/std/strings/string.view/nothing_to_do.pass.cpp

@@ -0,0 +1,12 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include <string_view>
+
+int main () {}

test/std/strings/string.view/string.view.access/at.pass.cpp

@@ -0,0 +1,63 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// NOTE: Older versions of clang have a bug where they fail to evalute
+// string_view::at as a constant expression.
+// XFAIL: clang-3.4, clang-3.3
+
+
+// <string_view>
+
+// constexpr const _CharT& at(size_type _pos) const;
+
+#include <string_view>
+#include <stdexcept>
+#include <cassert>
+
+#include "test_macros.h"
+
+template <typename CharT>
+void test ( const CharT *s, size_t len ) {
+    std::basic_string_view<CharT> sv ( s, len );
+    assert ( sv.length() == len );
+    for ( size_t i = 0; i < len; ++i ) {
+        assert (  sv.at(i) == s[i] );
+        assert ( &sv.at(i) == s + i );
+    }
+
+#ifndef TEST_HAS_NO_EXCEPTIONS
+    try { sv.at(len); } catch ( const std::out_of_range & ) { return ; }
+    assert ( false );
+#endif
+}
+
+int main () {
+    test ( "ABCDE", 5 );
+    test ( "a", 1 );
+
+    test ( L"ABCDE", 5 );
+    test ( L"a", 1 );
+
+#if TEST_STD_VER >= 11
+    test ( u"ABCDE", 5 );
+    test ( u"a", 1 );
+
+    test ( U"ABCDE", 5 );
+    test ( U"a", 1 );
+#endif
+
+#if TEST_STD_VER >= 11
+    {
+    constexpr std::basic_string_view<char> sv ( "ABC", 2 );
+    static_assert ( sv.length() ==  2,  "" );
+    static_assert ( sv.at(0) == 'A', "" );
+    static_assert ( sv.at(1) == 'B', "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.access/back.pass.cpp

@@ -0,0 +1,50 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// constexpr const _CharT& front();
+
+#include <string_view>
+#include <cassert>
+
+#include "test_macros.h"
+
+template <typename CharT>
+bool test ( const CharT *s, size_t len ) {
+    std::basic_string_view<CharT> sv ( s, len );
+    assert ( sv.length() == len );
+    assert ( sv.back() == s[len-1] );
+    return &sv.back() == s + len - 1;
+    }
+
+int main () {
+    assert ( test ( "ABCDE", 5 ));
+    assert ( test ( "a", 1 ));
+
+    assert ( test ( L"ABCDE", 5 ));
+    assert ( test ( L"a", 1 ));
+
+#if TEST_STD_VER >= 11
+    assert ( test ( u"ABCDE", 5 ));
+    assert ( test ( u"a", 1 ));
+
+    assert ( test ( U"ABCDE", 5 ));
+    assert ( test ( U"a", 1 ));
+#endif
+
+#if TEST_STD_VER >= 11
+    {
+    constexpr std::basic_string_view<char> sv ( "ABC", 2 );
+    static_assert ( sv.length() ==  2,  "" );
+    static_assert ( sv.back()  == 'B', "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.access/data.pass.cpp

@@ -0,0 +1,50 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// constexpr const _CharT* data() const noexcept;
+
+#include <string_view>
+#include <cassert>
+
+#include "test_macros.h"
+
+template <typename CharT>
+void test ( const CharT *s, size_t len ) {
+    std::basic_string_view<CharT> sv ( s, len );
+    assert ( sv.length() == len );
+    assert ( sv.data() == s );
+    }
+
+int main () {
+    test ( "ABCDE", 5 );
+    test ( "a", 1 );
+
+    test ( L"ABCDE", 5 );
+    test ( L"a", 1 );
+
+#if TEST_STD_VER >= 11
+    test ( u"ABCDE", 5 );
+    test ( u"a", 1 );
+
+    test ( U"ABCDE", 5 );
+    test ( U"a", 1 );
+#endif
+
+#if _LIBCPP_STD_VER > 11
+    {
+    constexpr const char *s = "ABC";
+    constexpr std::basic_string_view<char> sv( s, 2 );
+    static_assert( sv.length() ==  2,  "" );
+    static_assert( sv.data() == s, "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.access/front.pass.cpp

@@ -0,0 +1,50 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// constexpr const _CharT& back();
+
+#include <string_view>
+#include <cassert>
+
+#include "test_macros.h"
+
+template <typename CharT>
+bool test ( const CharT *s, size_t len ) {
+    std::basic_string_view<CharT> sv ( s, len );
+    assert ( sv.length() == len );
+    assert ( sv.front() == s[0] );
+    return &sv.front() == s;
+    }
+
+int main () {
+    assert ( test ( "ABCDE", 5 ));
+    assert ( test ( "a", 1 ));
+
+    assert ( test ( L"ABCDE", 5 ));
+    assert ( test ( L"a", 1 ));
+
+#if TEST_STD_VER >= 11
+    assert ( test ( u"ABCDE", 5 ));
+    assert ( test ( u"a", 1 ));
+
+    assert ( test ( U"ABCDE", 5 ));
+    assert ( test ( U"a", 1 ));
+#endif
+
+#if TEST_STD_VER >= 11
+    {
+    constexpr std::basic_string_view<char> sv ( "ABC", 2 );
+    static_assert ( sv.length() ==  2,  "" );
+    static_assert ( sv.front()  == 'A', "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.access/index.pass.cpp

@@ -0,0 +1,53 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// constexpr const _CharT& operator[](size_type _pos) const;
+
+#include <string_view>
+#include <cassert>
+
+#include "test_macros.h"
+
+template <typename CharT>
+void test ( const CharT *s, size_t len ) {
+    std::basic_string_view<CharT> sv ( s, len );
+    assert ( sv.length() == len );
+    for ( size_t i = 0; i < len; ++i ) {
+        assert ( sv[i] == s[i] );
+        assert ( &sv[i] == s + i );
+        }
+    }
+
+int main () {
+    test ( "ABCDE", 5 );
+    test ( "a", 1 );
+
+    test ( L"ABCDE", 5 );
+    test ( L"a", 1 );
+
+#if TEST_STD_VER >= 11
+    test ( u"ABCDE", 5 );
+    test ( u"a", 1 );
+
+    test ( U"ABCDE", 5 );
+    test ( U"a", 1 );
+#endif
+
+#if _LIBCPP_STD_VER > 11
+    {
+    constexpr std::basic_string_view<char> sv ( "ABC", 2 );
+    static_assert ( sv.length() ==  2,  "" );
+    static_assert ( sv[0]  == 'A', "" );
+    static_assert ( sv[1]  == 'B', "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.capacity/capacity.pass.cpp

@@ -0,0 +1,89 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// [string.view.capacity], capacity
+// constexpr size_type size()     const noexcept;
+// constexpr size_type length()   const noexcept;
+// constexpr size_type max_size() const noexcept;
+// constexpr bool empty()         const noexcept;
+
+#include <string_view>
+#include <cassert>
+
+#include "test_macros.h"
+
+template<typename SV>
+void test1 () {
+#if _LIBCPP_STD_VER > 11
+    {
+    constexpr SV sv1;
+    static_assert ( sv1.size() == 0, "" );
+    static_assert ( sv1.empty(), "");
+    static_assert ( sv1.size() == sv1.length(), "" );
+    static_assert ( sv1.max_size() > sv1.size(), "");
+    }
+#endif
+
+    {
+    SV sv1;
+    assert ( sv1.size() == 0 );
+    assert ( sv1.empty());
+    assert ( sv1.size() == sv1.length());
+    assert ( sv1.max_size() > sv1.size());
+    }
+}
+
+template<typename CharT>
+void test2 ( const CharT *s, size_t len ) {
+    {
+    std::basic_string_view<CharT> sv1 ( s );
+    assert ( sv1.size() == len );
+    assert ( sv1.data() == s );
+    assert ( sv1.empty() == (len == 0));
+    assert ( sv1.size() == sv1.length());
+    assert ( sv1.max_size() > sv1.size());
+    }
+}
+
+int main () {
+    typedef std::string_view    string_view;
+    typedef std::u16string_view u16string_view;
+    typedef std::u32string_view u32string_view;
+    typedef std::wstring_view   wstring_view;
+
+    test1<string_view> ();
+    test1<u16string_view> ();
+    test1<u32string_view> ();
+    test1<wstring_view> ();
+
+    test2 ( "ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE", 105 );
+    test2 ( "ABCDE", 5 );
+    test2 ( "a", 1 );
+    test2 ( "", 0 );
+
+    test2 ( L"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE", 105 );
+    test2 ( L"ABCDE", 5 );
+    test2 ( L"a", 1 );
+    test2 ( L"", 0 );
+
+#if TEST_STD_VER >= 11
+    test2 ( u"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE", 105 );
+    test2 ( u"ABCDE", 5 );
+    test2 ( u"a", 1 );
+    test2 ( u"", 0 );
+
+    test2 ( U"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE", 105 );
+    test2 ( U"ABCDE", 5 );
+    test2 ( U"a", 1 );
+    test2 ( U"", 0 );
+#endif
+}

test/std/strings/string.view/string.view.comparison/opeq.string_view.pointer.pass.cpp

@@ -0,0 +1,68 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits>
+//   constexpr bool operator==(basic_string_view<charT,traits> lhs, const charT* rhs);
+// template<class charT, class traits>
+//   constexpr bool operator==(const charT* lhs, basic_string_view<charT,traits> rhs);
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(S lhs, const typename S::value_type* rhs, bool x)
+{
+    assert((lhs == rhs) == x);
+    assert((rhs == lhs) == x);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test(S(""), "", true);
+    test(S(""), "abcde", false);
+    test(S(""), "abcdefghij", false);
+    test(S(""), "abcdefghijklmnopqrst", false);
+    test(S("abcde"), "", false);
+    test(S("abcde"), "abcde", true);
+    test(S("abcde"), "abcdefghij", false);
+    test(S("abcde"), "abcdefghijklmnopqrst", false);
+    test(S("abcdefghij"), "", false);
+    test(S("abcdefghij"), "abcde", false);
+    test(S("abcdefghij"), "abcdefghij", true);
+    test(S("abcdefghij"), "abcdefghijklmnopqrst", false);
+    test(S("abcdefghijklmnopqrst"), "", false);
+    test(S("abcdefghijklmnopqrst"), "abcde", false);
+    test(S("abcdefghijklmnopqrst"), "abcdefghij", false);
+    test(S("abcdefghijklmnopqrst"), "abcdefghijklmnopqrst", true);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+    static_assert (  sv1     == "", "" );
+    static_assert (  ""      == sv1, "" );
+    static_assert (!(sv1     == "abcde"), "" );
+    static_assert (!("abcde" == sv1), "" );
+
+    static_assert (  sv2      == "abcde", "" );
+    static_assert (  "abcde"  == sv2, "" );
+    static_assert (!(sv2      == "abcde0"), "" );
+    static_assert (!("abcde0" == sv2), "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.comparison/opeq.string_view.string.pass.cpp

@@ -0,0 +1,51 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits, class Allocator>
+//   bool operator==(const charT* lhs, const basic_string<charT,traits> rhs);
+// template<class charT, class traits, class Allocator>
+//   bool operator==(const basic_string_view<charT,traits> lhs, const CharT* rhs);
+
+#include <string_view>
+#include <string>
+#include <cassert>
+
+template <class S>
+void
+test(const std::string &lhs, S rhs, bool x)
+{
+    assert((lhs == rhs) == x);
+    assert((rhs == lhs) == x);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test("", S(""), true);
+    test("", S("abcde"), false);
+    test("", S("abcdefghij"), false);
+    test("", S("abcdefghijklmnopqrst"), false);
+    test("abcde", S(""), false);
+    test("abcde", S("abcde"), true);
+    test("abcde", S("abcdefghij"), false);
+    test("abcde", S("abcdefghijklmnopqrst"), false);
+    test("abcdefghij", S(""), false);
+    test("abcdefghij", S("abcde"), false);
+    test("abcdefghij", S("abcdefghij"), true);
+    test("abcdefghij", S("abcdefghijklmnopqrst"), false);
+    test("abcdefghijklmnopqrst", S(""), false);
+    test("abcdefghijklmnopqrst", S("abcde"), false);
+    test("abcdefghijklmnopqrst", S("abcdefghij"), false);
+    test("abcdefghijklmnopqrst", S("abcdefghijklmnopqrst"), true);
+    }
+}
+

test/std/strings/string.view/string.view.comparison/opeq.string_view.string_view.pass.cpp

@@ -0,0 +1,61 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// template<class charT, class traits, class Allocator>
+//   constexpr bool operator==(const basic_string_view<charT,traits> lhs,
+//                   const basic_string_view<charT,traits> rhs);
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(S lhs, S rhs, bool x)
+{
+    assert((lhs == rhs) == x);
+    assert((rhs == lhs) == x);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test(S(""), S(""), true);
+    test(S(""), S("abcde"), false);
+    test(S(""), S("abcdefghij"), false);
+    test(S(""), S("abcdefghijklmnopqrst"), false);
+    test(S("abcde"), S(""), false);
+    test(S("abcde"), S("abcde"), true);
+    test(S("abcde"), S("abcdefghij"), false);
+    test(S("abcde"), S("abcdefghijklmnopqrst"), false);
+    test(S("abcdefghij"), S(""), false);
+    test(S("abcdefghij"), S("abcde"), false);
+    test(S("abcdefghij"), S("abcdefghij"), true);
+    test(S("abcdefghij"), S("abcdefghijklmnopqrst"), false);
+    test(S("abcdefghijklmnopqrst"), S(""), false);
+    test(S("abcdefghijklmnopqrst"), S("abcde"), false);
+    test(S("abcdefghijklmnopqrst"), S("abcdefghij"), false);
+    test(S("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), true);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2;
+    constexpr SV  sv3 { "abcde", 5 };
+    static_assert (  sv1 == sv2, "" );
+    static_assert (!(sv1 == sv3), "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.comparison/opge.string_view.pointer.pass.cpp

@@ -0,0 +1,71 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits, class Allocator>
+//   constexpr bool operator>=(const charT* lhs, basic_string_wiew<charT,traits> rhs);
+// template<class charT, class traits, class Allocator>
+//   constexpr bool operator>=(basic_string_wiew<charT,traits> lhs, const charT* rhs);
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const typename S::value_type* lhs, const S& rhs, bool x, bool y)
+{
+    assert((lhs >= rhs) == x);
+    assert((rhs >= lhs) == y);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test("", S(""), true, true);
+    test("", S("abcde"), false, true);
+    test("", S("abcdefghij"), false, true);
+    test("", S("abcdefghijklmnopqrst"), false, true);
+    test("abcde", S(""), true, false);
+    test("abcde", S("abcde"), true, true);
+    test("abcde", S("abcdefghij"), false, true);
+    test("abcde", S("abcdefghijklmnopqrst"), false, true);
+    test("abcdefghij", S(""), true, false);
+    test("abcdefghij", S("abcde"), true, false);
+    test("abcdefghij", S("abcdefghij"), true, true);
+    test("abcdefghij", S("abcdefghijklmnopqrst"), false, true);
+    test("abcdefghijklmnopqrst", S(""), true, false);
+    test("abcdefghijklmnopqrst", S("abcde"), true, false);
+    test("abcdefghijklmnopqrst", S("abcdefghij"), true, false);
+    test("abcdefghijklmnopqrst", S("abcdefghijklmnopqrst"), true, true);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (  sv1     >= "", "" );
+    static_assert (  ""      >= sv1, "" );
+    static_assert (!(sv1     >= "abcde"), "" );
+    static_assert (  "abcde" >= sv1, "" );
+
+    static_assert (  sv2      >= "", "" );
+    static_assert (!(""       >= sv2), "" );
+    static_assert (  sv2      >= "abcde", "" );
+    static_assert (  "abcde"  >= sv2, "" );
+    static_assert (!(sv2      >= "abcde0"), "" );
+    static_assert (  "abcde0" >= sv2, "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.comparison/opge.string_view.string.pass.cpp

@@ -0,0 +1,50 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits, class Allocator>
+//   bool operator>=(const basic_string<charT,traits,Allocator>& lhs,
+//                   basic_string_view<charT,traits> rhs);
+//   bool operator>=(basic_string_view<charT,traits> lhs,
+//            const basic_string<charT,traits,Allocator>&  rhs);
+
+#include <string_view>
+#include <cassert>
+
+template <class S>
+void
+test(const S& lhs, const typename S::value_type* rhs, bool x, bool y)
+{
+    assert((lhs >= rhs) == x);
+    assert((rhs >= lhs) == y);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test(S(""), "", true, true);
+    test(S(""), "abcde", false, true);
+    test(S(""), "abcdefghij", false, true);
+    test(S(""), "abcdefghijklmnopqrst", false, true);
+    test(S("abcde"), "", true, false);
+    test(S("abcde"), "abcde", true, true);
+    test(S("abcde"), "abcdefghij", false, true);
+    test(S("abcde"), "abcdefghijklmnopqrst", false, true);
+    test(S("abcdefghij"), "", true, false);
+    test(S("abcdefghij"), "abcde", true, false);
+    test(S("abcdefghij"), "abcdefghij", true, true);
+    test(S("abcdefghij"), "abcdefghijklmnopqrst", false, true);
+    test(S("abcdefghijklmnopqrst"), "", true, false);
+    test(S("abcdefghijklmnopqrst"), "abcde", true, false);
+    test(S("abcdefghijklmnopqrst"), "abcdefghij", true, false);
+    test(S("abcdefghijklmnopqrst"), "abcdefghijklmnopqrst", true, true);
+    }
+}

test/std/strings/string.view/string.view.comparison/opge.string_view.string_view.pass.cpp

@@ -0,0 +1,64 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits>
+//   constexpr bool operator>=(basic_string_view<charT,traits> lhs,
+//                  basic_string_view<charT,traits> rhs);
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& lhs, const S& rhs, bool x, bool y)
+{
+    assert((lhs >= rhs) == x);
+    assert((rhs >= lhs) == y);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test(S(""), S(""), true, true);
+    test(S(""), S("abcde"), false, true);
+    test(S(""), S("abcdefghij"), false, true);
+    test(S(""), S("abcdefghijklmnopqrst"), false, true);
+    test(S("abcde"), S(""), true, false);
+    test(S("abcde"), S("abcde"), true, true);
+    test(S("abcde"), S("abcdefghij"), false, true);
+    test(S("abcde"), S("abcdefghijklmnopqrst"), false, true);
+    test(S("abcdefghij"), S(""), true, false);
+    test(S("abcdefghij"), S("abcde"), true, false);
+    test(S("abcdefghij"), S("abcdefghij"), true, true);
+    test(S("abcdefghij"), S("abcdefghijklmnopqrst"), false, true);
+    test(S("abcdefghijklmnopqrst"), S(""), true, false);
+    test(S("abcdefghijklmnopqrst"), S("abcde"), true, false);
+    test(S("abcdefghijklmnopqrst"), S("abcdefghij"), true, false);
+    test(S("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), true, true);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (  sv1 >= sv1,  "" );
+    static_assert (  sv2 >= sv2,  "" );
+
+    static_assert (!(sv1 >= sv2), "" );
+    static_assert (  sv2 >= sv1,  "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.comparison/opgt.string_view.pointer.pass.cpp

@@ -0,0 +1,71 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// constexpr template<class charT, class traits, class Allocator>
+//   bool operator>(const charT* lhs, basic_string_wiew<charT,traits> rhs);
+// constexpr template<class charT, class traits, class Allocator>
+//   bool operator>(basic_string_wiew<charT,traits> lhs, const charT* rhs);
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const typename S::value_type* lhs, const S& rhs, bool x, bool y)
+{
+    assert((lhs > rhs) == x);
+    assert((rhs > lhs) == y);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test("", S(""), false, false);
+    test("", S("abcde"), false, true);
+    test("", S("abcdefghij"), false, true);
+    test("", S("abcdefghijklmnopqrst"), false, true);
+    test("abcde", S(""), true, false);
+    test("abcde", S("abcde"), false, false);
+    test("abcde", S("abcdefghij"), false, true);
+    test("abcde", S("abcdefghijklmnopqrst"), false, true);
+    test("abcdefghij", S(""), true, false);
+    test("abcdefghij", S("abcde"), true, false);
+    test("abcdefghij", S("abcdefghij"), false, false);
+    test("abcdefghij", S("abcdefghijklmnopqrst"), false, true);
+    test("abcdefghijklmnopqrst", S(""), true, false);
+    test("abcdefghijklmnopqrst", S("abcde"), true, false);
+    test("abcdefghijklmnopqrst", S("abcdefghij"), true, false);
+    test("abcdefghijklmnopqrst", S("abcdefghijklmnopqrst"), false, false);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (!(sv1     > ""), "" );
+    static_assert (!(""      > sv1), "" );
+    static_assert (!(sv1     > "abcde"), "" );
+    static_assert (  "abcde" > sv1, "" );
+
+    static_assert (  sv2      > "", "" );
+    static_assert (!(""       > sv2), "" );
+    static_assert (!(sv2      > "abcde"), "" );
+    static_assert (!("abcde"  > sv2), "" );
+    static_assert (!(sv2      > "abcde0"), "" );
+    static_assert (  "abcde0" > sv2, "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.comparison/opgt.string_view.string.pass.cpp

@@ -0,0 +1,50 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits, class Allocator>
+//   bool operator>(const basic_string<charT,traits,Allocator>& lhs,
+//                   basic_string_view<charT,traits> rhs);
+//   bool operator>(basic_string_view<charT,traits> lhs,
+//            const basic_string<charT,traits,Allocator>&  rhs);
+
+#include <string_view>
+#include <cassert>
+
+template <class S>
+void
+test(const S& lhs, const typename S::value_type* rhs, bool x, bool y)
+{
+    assert((lhs > rhs) == x);
+    assert((rhs > lhs) == y);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test(S(""), "", false, false);
+    test(S(""), "abcde", false, true);
+    test(S(""), "abcdefghij", false, true);
+    test(S(""), "abcdefghijklmnopqrst", false, true);
+    test(S("abcde"), "", true, false);
+    test(S("abcde"), "abcde", false, false);
+    test(S("abcde"), "abcdefghij", false, true);
+    test(S("abcde"), "abcdefghijklmnopqrst", false, true);
+    test(S("abcdefghij"), "", true, false);
+    test(S("abcdefghij"), "abcde", true, false);
+    test(S("abcdefghij"), "abcdefghij", false, false);
+    test(S("abcdefghij"), "abcdefghijklmnopqrst", false, true);
+    test(S("abcdefghijklmnopqrst"), "", true, false);
+    test(S("abcdefghijklmnopqrst"), "abcde", true, false);
+    test(S("abcdefghijklmnopqrst"), "abcdefghij", true, false);
+    test(S("abcdefghijklmnopqrst"), "abcdefghijklmnopqrst", false, false);
+    }
+}

test/std/strings/string.view/string.view.comparison/opgt.string_view.string_view.pass.cpp

@@ -0,0 +1,64 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits>
+//  constexpr bool operator>(basic_string_view<charT,traits> lhs,
+//                  basic_string_view<charT,traits> rhs);
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& lhs, const S& rhs, bool x, bool y)
+{
+    assert((lhs > rhs) == x);
+    assert((rhs > lhs) == y);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test(S(""), S(""), false, false);
+    test(S(""), S("abcde"), false, true);
+    test(S(""), S("abcdefghij"), false, true);
+    test(S(""), S("abcdefghijklmnopqrst"), false, true);
+    test(S("abcde"), S(""), true, false);
+    test(S("abcde"), S("abcde"), false, false);
+    test(S("abcde"), S("abcdefghij"), false, true);
+    test(S("abcde"), S("abcdefghijklmnopqrst"), false, true);
+    test(S("abcdefghij"), S(""), true, false);
+    test(S("abcdefghij"), S("abcde"), true, false);
+    test(S("abcdefghij"), S("abcdefghij"), false, false);
+    test(S("abcdefghij"), S("abcdefghijklmnopqrst"), false, true);
+    test(S("abcdefghijklmnopqrst"), S(""), true, false);
+    test(S("abcdefghijklmnopqrst"), S("abcde"), true, false);
+    test(S("abcdefghijklmnopqrst"), S("abcdefghij"), true, false);
+    test(S("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), false, false);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (!(sv1 > sv1), "" );
+    static_assert (!(sv2 > sv2), "" );
+
+    static_assert (!(sv1 > sv2), "" );
+    static_assert (  sv2 > sv1, "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.comparison/ople.string_view.pointer.pass.cpp

@@ -0,0 +1,71 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits, class Allocator>
+//   constexpr bool operator<=(const charT* lhs, basic_string_wiew<charT,traits> rhs);
+// template<class charT, class traits, class Allocator>
+//   constexpr bool operator<=(basic_string_wiew<charT,traits> lhs, const charT* rhs);
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const typename S::value_type* lhs, const S& rhs, bool x, bool y)
+{
+    assert((lhs <= rhs) == x);
+    assert((rhs <= lhs) == y);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test("", S(""), true, true);
+    test("", S("abcde"), true, false);
+    test("", S("abcdefghij"), true, false);
+    test("", S("abcdefghijklmnopqrst"), true, false);
+    test("abcde", S(""), false, true);
+    test("abcde", S("abcde"), true, true);
+    test("abcde", S("abcdefghij"), true, false);
+    test("abcde", S("abcdefghijklmnopqrst"), true, false);
+    test("abcdefghij", S(""), false, true);
+    test("abcdefghij", S("abcde"), false, true);
+    test("abcdefghij", S("abcdefghij"), true, true);
+    test("abcdefghij", S("abcdefghijklmnopqrst"), true, false);
+    test("abcdefghijklmnopqrst", S(""), false, true);
+    test("abcdefghijklmnopqrst", S("abcde"), false, true);
+    test("abcdefghijklmnopqrst", S("abcdefghij"), false, true);
+    test("abcdefghijklmnopqrst", S("abcdefghijklmnopqrst"), true, true);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (  sv1     <= "", "" );
+    static_assert (  ""      <= sv1, "" );
+    static_assert (  sv1     <= "abcde", "" );
+    static_assert (!("abcde" <= sv1), "" );
+
+    static_assert (!(sv2      <= ""), "" );
+    static_assert (  ""       <= sv2, "" );
+    static_assert (  sv2      <= "abcde", "" );
+    static_assert (  "abcde"  <= sv2, "" );
+    static_assert (  sv2      <= "abcde0", "" );
+    static_assert (!("abcde0" <= sv2), "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.comparison/ople.string_view.string.pass.cpp

@@ -0,0 +1,50 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits, class Allocator>
+//   bool operator<=(const basic_string<charT,traits,Allocator>& lhs,
+//                   basic_string_view<charT,traits> rhs);
+//   bool operator<=(basic_string_view<charT,traits> lhs,
+//            const basic_string<charT,traits,Allocator>&  rhs);
+
+#include <string_view>
+#include <cassert>
+
+template <class S>
+void
+test(const S& lhs, const typename S::value_type* rhs, bool x, bool y)
+{
+    assert((lhs <= rhs) == x);
+    assert((rhs <= lhs) == y);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test(S(""), "", true, true);
+    test(S(""), "abcde", true, false);
+    test(S(""), "abcdefghij", true, false);
+    test(S(""), "abcdefghijklmnopqrst", true, false);
+    test(S("abcde"), "", false, true);
+    test(S("abcde"), "abcde", true, true);
+    test(S("abcde"), "abcdefghij", true, false);
+    test(S("abcde"), "abcdefghijklmnopqrst", true, false);
+    test(S("abcdefghij"), "", false, true);
+    test(S("abcdefghij"), "abcde", false, true);
+    test(S("abcdefghij"), "abcdefghij", true, true);
+    test(S("abcdefghij"), "abcdefghijklmnopqrst", true, false);
+    test(S("abcdefghijklmnopqrst"), "", false, true);
+    test(S("abcdefghijklmnopqrst"), "abcde", false, true);
+    test(S("abcdefghijklmnopqrst"), "abcdefghij", false, true);
+    test(S("abcdefghijklmnopqrst"), "abcdefghijklmnopqrst", true, true);
+    }
+}

test/std/strings/string.view/string.view.comparison/ople.string_view.string_view.pass.cpp

@@ -0,0 +1,64 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits>
+//   constexpr bool operator<=(basic_string_view<charT,traits> lhs,
+//                  basic_string_view<charT,traits> rhs);
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& lhs, const S& rhs, bool x, bool y)
+{
+    assert((lhs <= rhs) == x);
+    assert((rhs <= lhs) == y);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test(S(""), S(""), true, true);
+    test(S(""), S("abcde"), true, false);
+    test(S(""), S("abcdefghij"), true, false);
+    test(S(""), S("abcdefghijklmnopqrst"), true, false);
+    test(S("abcde"), S(""), false, true);
+    test(S("abcde"), S("abcde"), true, true);
+    test(S("abcde"), S("abcdefghij"), true, false);
+    test(S("abcde"), S("abcdefghijklmnopqrst"), true, false);
+    test(S("abcdefghij"), S(""), false, true);
+    test(S("abcdefghij"), S("abcde"), false, true);
+    test(S("abcdefghij"), S("abcdefghij"), true, true);
+    test(S("abcdefghij"), S("abcdefghijklmnopqrst"), true, false);
+    test(S("abcdefghijklmnopqrst"), S(""), false, true);
+    test(S("abcdefghijklmnopqrst"), S("abcde"), false, true);
+    test(S("abcdefghijklmnopqrst"), S("abcdefghij"), false, true);
+    test(S("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), true, true);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (  sv1 <= sv1,  "" );
+    static_assert (  sv2 <= sv2,  "" );
+
+    static_assert (  sv1 <= sv2,  "" );
+    static_assert (!(sv2 <= sv1), "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.comparison/oplt.string_view.pointer.pass.cpp

@@ -0,0 +1,71 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits, class Allocator>
+//   constexpr bool operator<(const charT* lhs, basic_string_wiew<charT,traits> rhs);
+// template<class charT, class traits, class Allocator>
+//   constexpr bool operator<(basic_string_wiew<charT,traits> lhs, const charT* rhs);
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const typename S::value_type* lhs, const S& rhs, bool x, bool y)
+{
+    assert((lhs < rhs) == x);
+    assert((rhs < lhs) == y);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test("", S(""), false, false);
+    test("", S("abcde"), true, false);
+    test("", S("abcdefghij"), true, false);
+    test("", S("abcdefghijklmnopqrst"), true, false);
+    test("abcde", S(""), false, true);
+    test("abcde", S("abcde"), false, false);
+    test("abcde", S("abcdefghij"), true, false);
+    test("abcde", S("abcdefghijklmnopqrst"), true, false);
+    test("abcdefghij", S(""), false, true);
+    test("abcdefghij", S("abcde"), false, true);
+    test("abcdefghij", S("abcdefghij"), false, false);
+    test("abcdefghij", S("abcdefghijklmnopqrst"), true, false);
+    test("abcdefghijklmnopqrst", S(""), false, true);
+    test("abcdefghijklmnopqrst", S("abcde"), false, true);
+    test("abcdefghijklmnopqrst", S("abcdefghij"), false, true);
+    test("abcdefghijklmnopqrst", S("abcdefghijklmnopqrst"), false, false);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (!(sv1     < ""), "" );
+    static_assert (!(""      < sv1), "" );
+    static_assert (  sv1     < "abcde", "" );
+    static_assert (!("abcde" < sv1), "" );
+
+    static_assert (!(sv2      < ""), "" );
+    static_assert (  ""       < sv2, "" );
+    static_assert (!(sv2      < "abcde"), "" );
+    static_assert (!("abcde"  < sv2), "" );
+    static_assert (  sv2      < "abcde0", "" );
+    static_assert (!("abcde0" < sv2), "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.comparison/oplt.string_view.string.pass.cpp

@@ -0,0 +1,50 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits, class Allocator>
+//   bool operator<(const basic_string<charT,traits,Allocator>& lhs,
+//                   basic_string_view<charT,traits> rhs);
+//   bool operator<(basic_string_view<charT,traits> lhs,
+//            const basic_string<charT,traits,Allocator>&  rhs);
+
+#include <string_view>
+#include <cassert>
+
+template <class S>
+void
+test(const S& lhs, const typename S::value_type* rhs, bool x, bool y)
+{
+    assert((lhs < rhs) == x);
+    assert((rhs < lhs) == y);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test(S(""), "", false, false);
+    test(S(""), "abcde", true, false);
+    test(S(""), "abcdefghij", true, false);
+    test(S(""), "abcdefghijklmnopqrst", true, false);
+    test(S("abcde"), "", false, true);
+    test(S("abcde"), "abcde", false, false);
+    test(S("abcde"), "abcdefghij", true, false);
+    test(S("abcde"), "abcdefghijklmnopqrst", true, false);
+    test(S("abcdefghij"), "", false, true);
+    test(S("abcdefghij"), "abcde", false, true);
+    test(S("abcdefghij"), "abcdefghij", false, false);
+    test(S("abcdefghij"), "abcdefghijklmnopqrst", true, false);
+    test(S("abcdefghijklmnopqrst"), "", false, true);
+    test(S("abcdefghijklmnopqrst"), "abcde", false, true);
+    test(S("abcdefghijklmnopqrst"), "abcdefghij", false, true);
+    test(S("abcdefghijklmnopqrst"), "abcdefghijklmnopqrst", false, false);
+    }
+}

test/std/strings/string.view/string.view.comparison/oplt.string_view.string_view.pass.cpp

@@ -0,0 +1,64 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits>
+//   constexpr bool operator<(basic_string_view<charT,traits> lhs,
+//                  basic_string_view<charT,traits> rhs);
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& lhs, const S& rhs, bool x, bool y)
+{
+    assert((lhs < rhs) == x);
+    assert((rhs < lhs) == y);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test(S(""), S(""), false, false);
+    test(S(""), S("abcde"), true, false);
+    test(S(""), S("abcdefghij"), true, false);
+    test(S(""), S("abcdefghijklmnopqrst"), true, false);
+    test(S("abcde"), S(""), false, true);
+    test(S("abcde"), S("abcde"), false, false);
+    test(S("abcde"), S("abcdefghij"), true, false);
+    test(S("abcde"), S("abcdefghijklmnopqrst"), true, false);
+    test(S("abcdefghij"), S(""), false, true);
+    test(S("abcdefghij"), S("abcde"), false, true);
+    test(S("abcdefghij"), S("abcdefghij"), false, false);
+    test(S("abcdefghij"), S("abcdefghijklmnopqrst"), true, false);
+    test(S("abcdefghijklmnopqrst"), S(""), false, true);
+    test(S("abcdefghijklmnopqrst"), S("abcde"), false, true);
+    test(S("abcdefghijklmnopqrst"), S("abcdefghij"), false, true);
+    test(S("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), false, false);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (!(sv1 < sv1), "" );
+    static_assert (!(sv2 < sv2), "" );
+
+    static_assert (  sv1 < sv2,  "" );
+    static_assert (!(sv2 < sv1), "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.comparison/opne.string_view.pointer.pass.cpp

@@ -0,0 +1,69 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits>
+//   constexpr bool operator!=(basic_string_view<charT,traits> lhs, const charT* rhs);
+// template<class charT, class traits>
+//   constexpr bool operator!=(const charT* lhs, basic_string_view<charT,traits> rhs);
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(S lhs, const typename S::value_type* rhs, bool x)
+{
+    assert((lhs != rhs) == x);
+    assert((rhs != lhs) == x);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test(S(""), "", false);
+    test(S(""), "abcde", true);
+    test(S(""), "abcdefghij", true);
+    test(S(""), "abcdefghijklmnopqrst", true);
+    test(S("abcde"), "", true);
+    test(S("abcde"), "abcde", false);
+    test(S("abcde"), "abcdefghij", true);
+    test(S("abcde"), "abcdefghijklmnopqrst", true);
+    test(S("abcdefghij"), "", true);
+    test(S("abcdefghij"), "abcde", true);
+    test(S("abcdefghij"), "abcdefghij", false);
+    test(S("abcdefghij"), "abcdefghijklmnopqrst", true);
+    test(S("abcdefghijklmnopqrst"), "", true);
+    test(S("abcdefghijklmnopqrst"), "abcde", true);
+    test(S("abcdefghijklmnopqrst"), "abcdefghij", true);
+    test(S("abcdefghijklmnopqrst"), "abcdefghijklmnopqrst", false);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (!(sv1     != ""), "" );
+    static_assert (!(""      != sv1), "" );
+    static_assert (  sv1     != "abcde", "" );
+    static_assert (  "abcde" != sv1, "" );
+
+    static_assert (!(sv2      != "abcde"), "" );
+    static_assert (!("abcde"  != sv2), "" );
+    static_assert (  sv2      != "abcde0",   "" );
+    static_assert (  "abcde0" != sv2, "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.comparison/opne.string_view.string.pass.cpp

@@ -0,0 +1,50 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits, class Allocator>
+//   bool operator!=(const basic_string<charT, traits, Allocator> &lhs, basic_string_view<charT,traits> rhs);
+// template<class charT, class traits, class Allocator>
+//   bool operator!=(basic_string_view<charT,traits> lhs, const basic_string<charT, traits, Allocator> &rhs);
+
+#include <string_view>
+#include <string>
+#include <cassert>
+
+template <class S>
+void
+test(const std::string &lhs, S rhs, bool x)
+{
+    assert((lhs != rhs) == x);
+    assert((rhs != lhs) == x);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test("", S(""), false);
+    test("", S("abcde"), true);
+    test("", S("abcdefghij"), true);
+    test("", S("abcdefghijklmnopqrst"), true);
+    test("abcde", S(""), true);
+    test("abcde", S("abcde"), false);
+    test("abcde", S("abcdefghij"), true);
+    test("abcde", S("abcdefghijklmnopqrst"), true);
+    test("abcdefghij", S(""), true);
+    test("abcdefghij", S("abcde"), true);
+    test("abcdefghij", S("abcdefghij"), false);
+    test("abcdefghij", S("abcdefghijklmnopqrst"), true);
+    test("abcdefghijklmnopqrst", S(""), true);
+    test("abcdefghijklmnopqrst", S("abcde"), true);
+    test("abcdefghijklmnopqrst", S("abcdefghij"), true);
+    test("abcdefghijklmnopqrst", S("abcdefghijklmnopqrst"), false);
+    }
+}

test/std/strings/string.view/string.view.comparison/opne.string_view.string_view.pass.cpp

@@ -0,0 +1,61 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// template<class charT, class traits, class Allocator>
+//   constexpr bool operator!=(const basic_string_view<charT,traits> lhs,
+//                   const basic_string_view<charT,traits> rhs);
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(S lhs, S rhs, bool x)
+{
+    assert((lhs != rhs) == x);
+    assert((rhs != lhs) == x);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test(S(""), S(""), false);
+    test(S(""), S("abcde"), true);
+    test(S(""), S("abcdefghij"), true);
+    test(S(""), S("abcdefghijklmnopqrst"), true);
+    test(S("abcde"), S(""), true);
+    test(S("abcde"), S("abcde"), false);
+    test(S("abcde"), S("abcdefghij"), true);
+    test(S("abcde"), S("abcdefghijklmnopqrst"), true);
+    test(S("abcdefghij"), S(""), true);
+    test(S("abcdefghij"), S("abcde"), true);
+    test(S("abcdefghij"), S("abcdefghij"), false);
+    test(S("abcdefghij"), S("abcdefghijklmnopqrst"), true);
+    test(S("abcdefghijklmnopqrst"), S(""), true);
+    test(S("abcdefghijklmnopqrst"), S("abcde"), true);
+    test(S("abcdefghijklmnopqrst"), S("abcdefghij"), true);
+    test(S("abcdefghijklmnopqrst"), S("abcdefghijklmnopqrst"), false);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2;
+    constexpr SV  sv3 { "abcde", 5 };
+    static_assert (!( sv1 != sv2), "" );
+    static_assert (   sv1 != sv3,  "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.cons/default.pass.cpp

@@ -0,0 +1,46 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// constexpr basic_string_view () noexcept;
+
+#include <string_view>
+#include <cassert>
+
+template<typename T>
+void test () {
+#if _LIBCPP_STD_VER > 11
+    {
+    constexpr T sv1;
+    static_assert ( sv1.size() == 0, "" );
+    static_assert ( sv1.empty(), "");
+    }
+#endif
+
+    {
+    T sv1;
+    assert ( sv1.size() == 0 );
+    assert ( sv1.empty());
+    }
+}
+
+int main () {
+    typedef std::string_view    string_view;
+    typedef std::u16string_view u16string_view;
+    typedef std::u32string_view u32string_view;
+    typedef std::wstring_view   wstring_view;
+
+    test<string_view> ();
+    test<u16string_view> ();
+    test<u32string_view> ();
+    test<wstring_view> ();
+
+}

test/std/strings/string.view/string.view.cons/from_literal.pass.cpp

@@ -0,0 +1,64 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// constexpr basic_string_view(const _CharT* _s)
+//    : __data (_s), __size(_Traits::length(_s)) {}
+
+
+#include <string_view>
+#include <string>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template<typename CharT>
+size_t StrLen ( const CharT *s ) {
+    size_t retVal = 0;
+    while ( *s != 0 ) { ++retVal; ++s; }
+    return retVal;
+    }
+
+template<typename CharT>
+void test ( const CharT *s ) {
+    std::basic_string_view<CharT> sv1 ( s );
+    assert ( sv1.size() == StrLen( s ));
+    assert ( sv1.data() == s );
+    }
+
+
+int main () {
+
+    test ( "QBCDE" );
+    test ( "A" );
+    test ( "" );
+
+    test ( L"QBCDE" );
+    test ( L"A" );
+    test ( L"" );
+
+#if TEST_STD_VER >= 11
+    test ( u"QBCDE" );
+    test ( u"A" );
+    test ( u"" );
+
+    test ( U"QBCDE" );
+    test ( U"A" );
+    test ( U"" );
+#endif
+
+#if _LIBCPP_STD_VER > 11
+    {
+    constexpr std::basic_string_view<char, constexpr_char_traits<char>> sv1 ( "ABCDE" );
+    static_assert ( sv1.size() == 5, "");
+    }
+#endif
+}

test/std/strings/string.view/string.view.cons/from_ptr_len.pass.cpp

@@ -0,0 +1,83 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+//  constexpr basic_string_view(const _CharT* _s, size_type _len)
+//      : __data (_s), __size(_len) {}
+
+
+#include <string_view>
+#include <string>
+#include <cassert>
+
+#include "test_macros.h"
+
+template<typename CharT>
+void test ( const CharT *s, size_t sz ) {
+    {
+    std::basic_string_view<CharT> sv1 ( s, sz );
+    assert ( sv1.size() == sz );
+    assert ( sv1.data() == s );
+    }
+}
+
+int main () {
+
+    test ( "QBCDE", 5 );
+    test ( "QBCDE", 2 );
+    test ( "", 0 );
+#if _LIBCPP_STD_VER > 11
+    {
+    constexpr const char *s = "QBCDE";
+    constexpr std::basic_string_view<char> sv1 ( s, 2 );
+    static_assert ( sv1.size() == 2, "" );
+    static_assert ( sv1.data() == s, "" );
+    }
+#endif
+
+    test ( L"QBCDE", 5 );
+    test ( L"QBCDE", 2 );
+    test ( L"", 0 );
+#if _LIBCPP_STD_VER > 11
+    {
+    constexpr const wchar_t *s = L"QBCDE";
+    constexpr std::basic_string_view<wchar_t> sv1 ( s, 2 );
+    static_assert ( sv1.size() == 2, "" );
+    static_assert ( sv1.data() == s, "" );
+    }
+#endif
+
+#if TEST_STD_VER >= 11
+    test ( u"QBCDE", 5 );
+    test ( u"QBCDE", 2 );
+    test ( u"", 0 );
+#if _LIBCPP_STD_VER > 11
+    {
+    constexpr const char16_t *s = u"QBCDE";
+    constexpr std::basic_string_view<char16_t> sv1 ( s, 2 );
+    static_assert ( sv1.size() == 2, "" );
+    static_assert ( sv1.data() == s, "" );
+    }
+#endif
+
+    test ( U"QBCDE", 5 );
+    test ( U"QBCDE", 2 );
+    test ( U"", 0 );
+#if _LIBCPP_STD_VER > 11
+    {
+    constexpr const char32_t *s = U"QBCDE";
+    constexpr std::basic_string_view<char32_t> sv1 ( s, 2 );
+    static_assert ( sv1.size() == 2, "" );
+    static_assert ( sv1.data() == s, "" );
+    }
+#endif
+#endif
+}

test/std/strings/string.view/string.view.cons/from_string.pass.cpp

@@ -0,0 +1,56 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// template<class Allocator>
+// basic_string_view(const basic_string<_CharT, _Traits, Allocator>& _str) noexcept
+
+
+#include <string_view>
+#include <string>
+#include <cassert>
+
+#include "test_macros.h"
+
+struct dummy_char_traits : public std::char_traits<char> {};
+
+template<typename CharT, typename Traits>
+void test ( const std::basic_string<CharT, Traits> &str ) {
+    std::basic_string_view<CharT, Traits> sv1 ( str );
+    assert ( sv1.size() == str.size());
+    assert ( sv1.data() == str.data());
+}
+
+int main () {
+
+    test ( std::string("QBCDE") );
+    test ( std::string("") );
+    test ( std::string() );
+
+    test ( std::wstring(L"QBCDE") );
+    test ( std::wstring(L"") );
+    test ( std::wstring() );
+
+#if TEST_STD_VER >= 11
+    test ( std::u16string{u"QBCDE"} );
+    test ( std::u16string{u""} );
+    test ( std::u16string{} );
+
+    test ( std::u32string{U"QBCDE"} );
+    test ( std::u32string{U""} );
+    test ( std::u32string{} );
+#endif
+
+    test ( std::basic_string<char, dummy_char_traits>("QBCDE") );
+    test ( std::basic_string<char, dummy_char_traits>("") );
+    test ( std::basic_string<char, dummy_char_traits>() );
+
+}

test/std/strings/string.view/string.view.cons/from_string1.fail.cpp

@@ -0,0 +1,32 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// template<class Allocator>
+// basic_string_view(const basic_string<_CharT, _Traits, Allocator>& _str) noexcept
+
+#include <string_view>
+#include <string>
+#include <cassert>
+
+struct dummy_char_traits : public std::char_traits<char> {};
+
+int main () {
+    using string_view = std::basic_string_view<char>;
+    using string      = std::              basic_string     <char, dummy_char_traits>;
+
+    {
+    string s{"QBCDE"};
+    string_view sv1 ( s );
+    assert ( sv1.size() == s.size());
+    assert ( sv1.data() == s.data());
+    }
+}

test/std/strings/string.view/string.view.cons/from_string2.fail.cpp

@@ -0,0 +1,32 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// template<class Allocator>
+// basic_string_view(const basic_string<_CharT, _Traits, Allocator>& _str) noexcept
+
+#include <string_view>
+#include <string>
+#include <cassert>
+
+struct dummy_char_traits : public std::char_traits<char> {};
+
+int main () {
+    using string_view = std::basic_string_view<char, dummy_char_traits>;
+    using string      = std::              basic_string     <char>;
+
+    {
+    string s{"QBCDE"};
+    string_view sv1 ( s );
+    assert ( sv1.size() == s.size());
+    assert ( sv1.data() == s.data());
+    }
+}

test/std/strings/string.view/string.view.find/find_char_size.pass.cpp

@@ -0,0 +1,84 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr size_type find(charT c, size_type pos = 0) const;
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, typename S::value_type c, typename S::size_type pos,
+     typename S::size_type x)
+{
+    assert(s.find(c, pos) == x);
+    if (x != S::npos)
+        assert(pos <= x && x + 1 <= s.size());
+}
+
+template <class S>
+void
+test(const S& s, typename S::value_type c, typename S::size_type x)
+{
+    assert(s.find(c) == x);
+    if (x != S::npos)
+        assert(0 <= x && x + 1 <= s.size());
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test(S(""), 'c', 0, S::npos);
+    test(S(""), 'c', 1, S::npos);
+    test(S("abcde"), 'c', 0, 2);
+    test(S("abcde"), 'c', 1, 2);
+    test(S("abcde"), 'c', 2, 2);
+    test(S("abcde"), 'c', 4, S::npos);
+    test(S("abcde"), 'c', 5, S::npos);
+    test(S("abcde"), 'c', 6, S::npos);
+    test(S("abcdeabcde"), 'c', 0, 2);
+    test(S("abcdeabcde"), 'c', 1, 2);
+    test(S("abcdeabcde"), 'c', 5, 7);
+    test(S("abcdeabcde"), 'c', 9, S::npos);
+    test(S("abcdeabcde"), 'c', 10, S::npos);
+    test(S("abcdeabcde"), 'c', 11, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), 'c', 0, 2);
+    test(S("abcdeabcdeabcdeabcde"), 'c', 1, 2);
+    test(S("abcdeabcdeabcdeabcde"), 'c', 10, 12);
+    test(S("abcdeabcdeabcdeabcde"), 'c', 19, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), 'c', 20, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), 'c', 21, S::npos);
+
+    test(S(""), 'c', S::npos);
+    test(S("abcde"), 'c', 2);
+    test(S("abcdeabcde"), 'c', 2);
+    test(S("abcdeabcdeabcdeabcde"), 'c', 2);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.find( 'c', 0 ) == SV::npos, "" );
+    static_assert (sv1.find( 'c', 1 ) == SV::npos, "" );
+    static_assert (sv2.find( 'c', 0 ) == 2, "" );
+    static_assert (sv2.find( 'c', 1 ) == 2, "" );
+    static_assert (sv2.find( 'c', 2 ) == 2, "" );
+    static_assert (sv2.find( 'c', 3 ) == SV::npos, "" );
+    static_assert (sv2.find( 'c', 4 ) == SV::npos, "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.find/find_first_not_of_char_size.pass.cpp

@@ -0,0 +1,84 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr size_type find_first_not_of(charT c, size_type pos = 0) const;
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, typename S::value_type c, typename S::size_type pos,
+     typename S::size_type x)
+{
+    assert(s.find_first_not_of(c, pos) == x);
+    if (x != S::npos)
+        assert(pos <= x && x < s.size());
+}
+
+template <class S>
+void
+test(const S& s, typename S::value_type c, typename S::size_type x)
+{
+    assert(s.find_first_not_of(c) == x);
+    if (x != S::npos)
+        assert(x < s.size());
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test(S(""), 'q', 0, S::npos);
+    test(S(""), 'q', 1, S::npos);
+    test(S("kitcj"), 'q', 0, 0);
+    test(S("qkamf"), 'q', 1, 1);
+    test(S("nhmko"), 'q', 2, 2);
+    test(S("tpsaf"), 'q', 4, 4);
+    test(S("lahfb"), 'q', 5, S::npos);
+    test(S("irkhs"), 'q', 6, S::npos);
+    test(S("gmfhdaipsr"), 'q', 0, 0);
+    test(S("kantesmpgj"), 'q', 1, 1);
+    test(S("odaftiegpm"), 'q', 5, 5);
+    test(S("oknlrstdpi"), 'q', 9, 9);
+    test(S("eolhfgpjqk"), 'q', 10, S::npos);
+    test(S("pcdrofikas"), 'q', 11, S::npos);
+    test(S("nbatdlmekrgcfqsophij"), 'q', 0, 0);
+    test(S("bnrpehidofmqtcksjgla"), 'q', 1, 1);
+    test(S("jdmciepkaqgotsrfnhlb"), 'q', 10, 10);
+    test(S("jtdaefblsokrmhpgcnqi"), 'q', 19, 19);
+    test(S("hkbgspofltajcnedqmri"), 'q', 20, S::npos);
+    test(S("oselktgbcapndfjihrmq"), 'q', 21, S::npos);
+
+    test(S(""), 'q', S::npos);
+    test(S("q"), 'q', S::npos);
+    test(S("qqq"), 'q', S::npos);
+    test(S("csope"), 'q', 0);
+    test(S("gfsmthlkon"), 'q', 0);
+    test(S("laenfsbridchgotmkqpj"), 'q', 0);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.find_first_not_of( 'q', 0 ) == SV::npos, "" );
+    static_assert (sv1.find_first_not_of( 'q', 1 ) == SV::npos, "" );
+    static_assert (sv2.find_first_not_of( 'q', 0 ) == 0, "" );
+    static_assert (sv2.find_first_not_of( 'q', 1 ) == 1, "" );
+    static_assert (sv2.find_first_not_of( 'q', 5 ) == SV::npos, "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.find/find_first_not_of_pointer_size.pass.cpp

@@ -0,0 +1,165 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr size_type find_first_not_of(const charT* s, size_type pos = 0) const;
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type pos,
+     typename S::size_type x)
+{
+    assert(s.find_first_not_of(str, pos) == x);
+    if (x != S::npos)
+        assert(pos <= x && x < s.size());
+}
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type x)
+{
+    assert(s.find_first_not_of(str) == x);
+    if (x != S::npos)
+        assert(x < s.size());
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), "", 0, S::npos);
+    test(S(""), "laenf", 0, S::npos);
+    test(S(""), "pqlnkmbdjo", 0, S::npos);
+    test(S(""), "qkamfogpnljdcshbreti", 0, S::npos);
+    test(S(""), "", 1, S::npos);
+    test(S(""), "bjaht", 1, S::npos);
+    test(S(""), "hjlcmgpket", 1, S::npos);
+    test(S(""), "htaobedqikfplcgjsmrn", 1, S::npos);
+    test(S("fodgq"), "", 0, 0);
+    test(S("qanej"), "dfkap", 0, 0);
+    test(S("clbao"), "ihqrfebgad", 0, 0);
+    test(S("mekdn"), "ngtjfcalbseiqrphmkdo", 0, S::npos);
+    test(S("srdfq"), "", 1, 1);
+    test(S("oemth"), "ikcrq", 1, 1);
+    test(S("cdaih"), "dmajblfhsg", 1, 3);
+    test(S("qohtk"), "oqftjhdmkgsblacenirp", 1, S::npos);
+    test(S("cshmd"), "", 2, 2);
+    test(S("lhcdo"), "oebqi", 2, 2);
+    test(S("qnsoh"), "kojhpmbsfe", 2, S::npos);
+    test(S("pkrof"), "acbsjqogpltdkhinfrem", 2, S::npos);
+    test(S("fmtsp"), "", 4, 4);
+    test(S("khbpm"), "aobjd", 4, 4);
+    test(S("pbsji"), "pcbahntsje", 4, 4);
+    test(S("mprdj"), "fhepcrntkoagbmldqijs", 4, S::npos);
+    test(S("eqmpa"), "", 5, S::npos);
+    test(S("omigs"), "kocgb", 5, S::npos);
+    test(S("onmje"), "fbslrjiqkm", 5, S::npos);
+    test(S("oqmrj"), "jeidpcmalhfnqbgtrsko", 5, S::npos);
+    test(S("schfa"), "", 6, S::npos);
+    test(S("igdsc"), "qngpd", 6, S::npos);
+    test(S("brqgo"), "rodhqklgmb", 6, S::npos);
+    test(S("tnrph"), "thdjgafrlbkoiqcspmne", 6, S::npos);
+    test(S("hcjitbfapl"), "", 0, 0);
+    test(S("daiprenocl"), "ashjd", 0, 2);
+    test(S("litpcfdghe"), "mgojkldsqh", 0, 1);
+    test(S("aidjksrolc"), "imqnaghkfrdtlopbjesc", 0, S::npos);
+    test(S("qpghtfbaji"), "", 1, 1);
+    test(S("gfshlcmdjr"), "nadkh", 1, 1);
+    test(S("nkodajteqp"), "ofdrqmkebl", 1, 4);
+    test(S("gbmetiprqd"), "bdfjqgatlksriohemnpc", 1, S::npos);
+    test(S("crnklpmegd"), "", 5, 5);
+    test(S("jsbtafedoc"), "prqgn", 5, 5);
+    test(S("qnmodrtkeb"), "pejafmnokr", 5, 6);
+    test(S("cpebqsfmnj"), "odnqkgijrhabfmcestlp", 5, S::npos);
+    test(S("lmofqdhpki"), "", 9, 9);
+    test(S("hnefkqimca"), "rtjpa", 9, S::npos);
+    test(S("drtasbgmfp"), "ktsrmnqagd", 9, 9);
+    test(S("lsaijeqhtr"), "rtdhgcisbnmoaqkfpjle", 9, S::npos);
+    test(S("elgofjmbrq"), "", 10, S::npos);
+    test(S("mjqdgalkpc"), "dplqa", 10, S::npos);
+    test(S("kthqnfcerm"), "dkacjoptns", 10, S::npos);
+    test(S("dfsjhanorc"), "hqfimtrgnbekpdcsjalo", 10, S::npos);
+    test(S("eqsgalomhb"), "", 11, S::npos);
+    test(S("akiteljmoh"), "lofbc", 11, S::npos);
+    test(S("hlbdfreqjo"), "astoegbfpn", 11, S::npos);
+    test(S("taqobhlerg"), "pdgreqomsncafklhtibj", 11, S::npos);
+    test(S("snafbdlghrjkpqtoceim"), "", 0, 0);
+    test(S("aemtbrgcklhndjisfpoq"), "lbtqd", 0, 0);
+    test(S("pnracgfkjdiholtbqsem"), "tboimldpjh", 0, 1);
+    test(S("dicfltehbsgrmojnpkaq"), "slcerthdaiqjfnobgkpm", 0, S::npos);
+    test(S("jlnkraeodhcspfgbqitm"), "", 1, 1);
+    test(S("lhosrngtmfjikbqpcade"), "aqibs", 1, 1);
+    test(S("rbtaqjhgkneisldpmfoc"), "gtfblmqinc", 1, 3);
+    test(S("gpifsqlrdkbonjtmheca"), "mkqpbtdalgniorhfescj", 1, S::npos);
+    test(S("hdpkobnsalmcfijregtq"), "", 10, 10);
+    test(S("jtlshdgqaiprkbcoenfm"), "pblas", 10, 11);
+    test(S("fkdrbqltsgmcoiphneaj"), "arosdhcfme", 10, 13);
+    test(S("crsplifgtqedjohnabmk"), "blkhjeogicatqfnpdmsr", 10, S::npos);
+    test(S("niptglfbosehkamrdqcj"), "", 19, 19);
+    test(S("copqdhstbingamjfkler"), "djkqc", 19, 19);
+    test(S("mrtaefilpdsgocnhqbjk"), "lgokshjtpb", 19, S::npos);
+    test(S("kojatdhlcmigpbfrqnes"), "bqjhtkfepimcnsgrlado", 19, S::npos);
+    test(S("eaintpchlqsbdgrkjofm"), "", 20, S::npos);
+    test(S("gjnhidfsepkrtaqbmclo"), "nocfa", 20, S::npos);
+    test(S("spocfaktqdbiejlhngmr"), "bgtajmiedc", 20, S::npos);
+    test(S("rphmlekgfscndtaobiqj"), "lsckfnqgdahejiopbtmr", 20, S::npos);
+    test(S("liatsqdoegkmfcnbhrpj"), "", 21, S::npos);
+    test(S("binjagtfldkrspcomqeh"), "gfsrt", 21, S::npos);
+    test(S("latkmisecnorjbfhqpdg"), "pfsocbhjtm", 21, S::npos);
+    test(S("lecfratdjkhnsmqpoigb"), "tpflmdnoicjgkberhqsa", 21, S::npos);
+}
+
+template <class S>
+void test1()
+{
+    test(S(""), "", S::npos);
+    test(S(""), "laenf", S::npos);
+    test(S(""), "pqlnkmbdjo", S::npos);
+    test(S(""), "qkamfogpnljdcshbreti", S::npos);
+    test(S("nhmko"), "", 0);
+    test(S("lahfb"), "irkhs", 0);
+    test(S("gmfhd"), "kantesmpgj", 2);
+    test(S("odaft"), "oknlrstdpiqmjbaghcfe", S::npos);
+    test(S("eolhfgpjqk"), "", 0);
+    test(S("nbatdlmekr"), "bnrpe", 2);
+    test(S("jdmciepkaq"), "jtdaefblso", 2);
+    test(S("hkbgspoflt"), "oselktgbcapndfjihrmq", S::npos);
+    test(S("gprdcokbnjhlsfmtieqa"), "", 0);
+    test(S("qjghlnftcaismkropdeb"), "bjaht", 0);
+    test(S("pnalfrdtkqcmojiesbhg"), "hjlcmgpket", 1);
+    test(S("pniotcfrhqsmgdkjbael"), "htaobedqikfplcgjsmrn", S::npos);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test0<S>();
+    test1<S>();
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.find_first_not_of( "",      0) == SV::npos, "" );
+    static_assert (sv1.find_first_not_of( "irkhs", 0) == SV::npos, "" );
+    static_assert (sv2.find_first_not_of( "",      0) == 0, "" );
+    static_assert (sv2.find_first_not_of( "gfsrt", 0) == 0, "" );
+    static_assert (sv2.find_first_not_of( "lecar", 0) == 1, "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.find/find_first_not_of_pointer_size_size.pass.cpp

@@ -0,0 +1,392 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr size_type find_first_not_of(const charT* s, size_type pos, size_type n) const;
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type pos,
+     typename S::size_type n, typename S::size_type x)
+{
+    assert(s.find_first_not_of(str, pos, n) == x);
+    if (x != S::npos)
+        assert(pos <= x && x < s.size());
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), "", 0, 0, S::npos);
+    test(S(""), "irkhs", 0, 0, S::npos);
+    test(S(""), "kante", 0, 1, S::npos);
+    test(S(""), "oknlr", 0, 2, S::npos);
+    test(S(""), "pcdro", 0, 4, S::npos);
+    test(S(""), "bnrpe", 0, 5, S::npos);
+    test(S(""), "jtdaefblso", 0, 0, S::npos);
+    test(S(""), "oselktgbca", 0, 1, S::npos);
+    test(S(""), "eqgaplhckj", 0, 5, S::npos);
+    test(S(""), "bjahtcmnlp", 0, 9, S::npos);
+    test(S(""), "hjlcmgpket", 0, 10, S::npos);
+    test(S(""), "htaobedqikfplcgjsmrn", 0, 0, S::npos);
+    test(S(""), "hpqiarojkcdlsgnmfetb", 0, 1, S::npos);
+    test(S(""), "dfkaprhjloqetcsimnbg", 0, 10, S::npos);
+    test(S(""), "ihqrfebgadntlpmjksoc", 0, 19, S::npos);
+    test(S(""), "ngtjfcalbseiqrphmkdo", 0, 20, S::npos);
+    test(S(""), "", 1, 0, S::npos);
+    test(S(""), "lbtqd", 1, 0, S::npos);
+    test(S(""), "tboim", 1, 1, S::npos);
+    test(S(""), "slcer", 1, 2, S::npos);
+    test(S(""), "cbjfs", 1, 4, S::npos);
+    test(S(""), "aqibs", 1, 5, S::npos);
+    test(S(""), "gtfblmqinc", 1, 0, S::npos);
+    test(S(""), "mkqpbtdalg", 1, 1, S::npos);
+    test(S(""), "kphatlimcd", 1, 5, S::npos);
+    test(S(""), "pblasqogic", 1, 9, S::npos);
+    test(S(""), "arosdhcfme", 1, 10, S::npos);
+    test(S(""), "blkhjeogicatqfnpdmsr", 1, 0, S::npos);
+    test(S(""), "bmhineprjcoadgstflqk", 1, 1, S::npos);
+    test(S(""), "djkqcmetslnghpbarfoi", 1, 10, S::npos);
+    test(S(""), "lgokshjtpbemarcdqnfi", 1, 19, S::npos);
+    test(S(""), "bqjhtkfepimcnsgrlado", 1, 20, S::npos);
+    test(S("eaint"), "", 0, 0, 0);
+    test(S("binja"), "gfsrt", 0, 0, 0);
+    test(S("latkm"), "pfsoc", 0, 1, 0);
+    test(S("lecfr"), "tpflm", 0, 2, 0);
+    test(S("eqkst"), "sgkec", 0, 4, 1);
+    test(S("cdafr"), "romds", 0, 5, 0);
+    test(S("prbhe"), "qhjistlgmr", 0, 0, 0);
+    test(S("lbisk"), "pedfirsglo", 0, 1, 0);
+    test(S("hrlpd"), "aqcoslgrmk", 0, 5, 0);
+    test(S("ehmja"), "dabckmepqj", 0, 9, 1);
+    test(S("mhqgd"), "pqscrjthli", 0, 10, 0);
+    test(S("tgklq"), "kfphdcsjqmobliagtren", 0, 0, 0);
+    test(S("bocjs"), "rokpefncljibsdhqtagm", 0, 1, 0);
+    test(S("grbsd"), "afionmkphlebtcjqsgrd", 0, 10, 0);
+    test(S("ofjqr"), "aenmqplidhkofrjbctsg", 0, 19, S::npos);
+    test(S("btlfi"), "osjmbtcadhiklegrpqnf", 0, 20, S::npos);
+    test(S("clrgb"), "", 1, 0, 1);
+    test(S("tjmek"), "osmia", 1, 0, 1);
+    test(S("bgstp"), "ckonl", 1, 1, 1);
+    test(S("hstrk"), "ilcaj", 1, 2, 1);
+    test(S("kmspj"), "lasiq", 1, 4, 1);
+    test(S("tjboh"), "kfqmr", 1, 5, 1);
+    test(S("ilbcj"), "klnitfaobg", 1, 0, 1);
+    test(S("jkngf"), "gjhmdlqikp", 1, 1, 1);
+    test(S("gfcql"), "skbgtahqej", 1, 5, 1);
+    test(S("dqtlg"), "bjsdgtlpkf", 1, 9, 1);
+    test(S("bthpg"), "bjgfmnlkio", 1, 10, 1);
+    test(S("dgsnq"), "lbhepotfsjdqigcnamkr", 1, 0, 1);
+    test(S("rmfhp"), "tebangckmpsrqdlfojhi", 1, 1, 1);
+    test(S("jfdam"), "joflqbdkhtegimscpanr", 1, 10, 3);
+    test(S("edapb"), "adpmcohetfbsrjinlqkg", 1, 19, S::npos);
+    test(S("brfsm"), "iacldqjpfnogbsrhmetk", 1, 20, S::npos);
+    test(S("ndrhl"), "", 2, 0, 2);
+    test(S("mrecp"), "otkgb", 2, 0, 2);
+    test(S("qlasf"), "cqsjl", 2, 1, 2);
+    test(S("smaqd"), "dpifl", 2, 2, 2);
+    test(S("hjeni"), "oapht", 2, 4, 2);
+    test(S("ocmfj"), "cifts", 2, 5, 2);
+    test(S("hmftq"), "nmsckbgalo", 2, 0, 2);
+    test(S("fklad"), "tpksqhamle", 2, 1, 2);
+    test(S("dirnm"), "tpdrchmkji", 2, 5, 3);
+    test(S("hrgdc"), "ijagfkblst", 2, 9, 3);
+    test(S("ifakg"), "kpocsignjb", 2, 10, 2);
+    test(S("ebrgd"), "pecqtkjsnbdrialgmohf", 2, 0, 2);
+    test(S("rcjml"), "aiortphfcmkjebgsndql", 2, 1, 2);
+    test(S("peqmt"), "sdbkeamglhipojqftrcn", 2, 10, 2);
+    test(S("frehn"), "ljqncehgmfktroapidbs", 2, 19, S::npos);
+    test(S("tqolf"), "rtcfodilamkbenjghqps", 2, 20, S::npos);
+    test(S("cjgao"), "", 4, 0, 4);
+    test(S("kjplq"), "mabns", 4, 0, 4);
+    test(S("herni"), "bdnrp", 4, 1, 4);
+    test(S("tadrb"), "scidp", 4, 2, 4);
+    test(S("pkfeo"), "agbjl", 4, 4, 4);
+    test(S("hoser"), "jfmpr", 4, 5, S::npos);
+    test(S("kgrsp"), "rbpefghsmj", 4, 0, 4);
+    test(S("pgejb"), "apsfntdoqc", 4, 1, 4);
+    test(S("thlnq"), "ndkjeisgcl", 4, 5, 4);
+    test(S("nbmit"), "rnfpqatdeo", 4, 9, S::npos);
+    test(S("jgmib"), "bntjlqrfik", 4, 10, S::npos);
+    test(S("ncrfj"), "kcrtmpolnaqejghsfdbi", 4, 0, 4);
+    test(S("ncsik"), "lobheanpkmqidsrtcfgj", 4, 1, 4);
+    test(S("sgbfh"), "athdkljcnreqbgpmisof", 4, 10, S::npos);
+    test(S("dktbn"), "qkdmjialrscpbhefgont", 4, 19, S::npos);
+    test(S("fthqm"), "dmasojntqleribkgfchp", 4, 20, S::npos);
+    test(S("klopi"), "", 5, 0, S::npos);
+    test(S("dajhn"), "psthd", 5, 0, S::npos);
+    test(S("jbgno"), "rpmjd", 5, 1, S::npos);
+    test(S("hkjae"), "dfsmk", 5, 2, S::npos);
+}
+
+template <class S>
+void test1()
+{
+    test(S("gbhqo"), "skqne", 5, 4, S::npos);
+    test(S("ktdor"), "kipnf", 5, 5, S::npos);
+    test(S("ldprn"), "hmrnqdgifl", 5, 0, S::npos);
+    test(S("egmjk"), "fsmjcdairn", 5, 1, S::npos);
+    test(S("armql"), "pcdgltbrfj", 5, 5, S::npos);
+    test(S("cdhjo"), "aekfctpirg", 5, 9, S::npos);
+    test(S("jcons"), "ledihrsgpf", 5, 10, S::npos);
+    test(S("cbrkp"), "mqcklahsbtirgopefndj", 5, 0, S::npos);
+    test(S("fhgna"), "kmlthaoqgecrnpdbjfis", 5, 1, S::npos);
+    test(S("ejfcd"), "sfhbamcdptojlkrenqgi", 5, 10, S::npos);
+    test(S("kqjhe"), "pbniofmcedrkhlstgaqj", 5, 19, S::npos);
+    test(S("pbdjl"), "mongjratcskbhqiepfdl", 5, 20, S::npos);
+    test(S("gajqn"), "", 6, 0, S::npos);
+    test(S("stedk"), "hrnat", 6, 0, S::npos);
+    test(S("tjkaf"), "gsqdt", 6, 1, S::npos);
+    test(S("dthpe"), "bspkd", 6, 2, S::npos);
+    test(S("klhde"), "ohcmb", 6, 4, S::npos);
+    test(S("bhlki"), "heatr", 6, 5, S::npos);
+    test(S("lqmoh"), "pmblckedfn", 6, 0, S::npos);
+    test(S("mtqin"), "aceqmsrbik", 6, 1, S::npos);
+    test(S("dpqbr"), "lmbtdehjrn", 6, 5, S::npos);
+    test(S("kdhmo"), "teqmcrlgib", 6, 9, S::npos);
+    test(S("jblqp"), "njolbmspac", 6, 10, S::npos);
+    test(S("qmjgl"), "pofnhidklamecrbqjgst", 6, 0, S::npos);
+    test(S("rothp"), "jbhckmtgrqnosafedpli", 6, 1, S::npos);
+    test(S("ghknq"), "dobntpmqklicsahgjerf", 6, 10, S::npos);
+    test(S("eopfi"), "tpdshainjkbfoemlrgcq", 6, 19, S::npos);
+    test(S("dsnmg"), "oldpfgeakrnitscbjmqh", 6, 20, S::npos);
+    test(S("jnkrfhotgl"), "", 0, 0, 0);
+    test(S("dltjfngbko"), "rqegt", 0, 0, 0);
+    test(S("bmjlpkiqde"), "dashm", 0, 1, 0);
+    test(S("skrflobnqm"), "jqirk", 0, 2, 0);
+    test(S("jkpldtshrm"), "rckeg", 0, 4, 0);
+    test(S("ghasdbnjqo"), "jscie", 0, 5, 0);
+    test(S("igrkhpbqjt"), "efsphndliq", 0, 0, 0);
+    test(S("ikthdgcamf"), "gdicosleja", 0, 1, 0);
+    test(S("pcofgeniam"), "qcpjibosfl", 0, 5, 2);
+    test(S("rlfjgesqhc"), "lrhmefnjcq", 0, 9, 4);
+    test(S("itphbqsker"), "dtablcrseo", 0, 10, 0);
+    test(S("skjafcirqm"), "apckjsftedbhgomrnilq", 0, 0, 0);
+    test(S("tcqomarsfd"), "pcbrgflehjtiadnsokqm", 0, 1, 0);
+    test(S("rocfeldqpk"), "nsiadegjklhobrmtqcpf", 0, 10, 0);
+    test(S("cfpegndlkt"), "cpmajdqnolikhgsbretf", 0, 19, 1);
+    test(S("fqbtnkeasj"), "jcflkntmgiqrphdosaeb", 0, 20, S::npos);
+    test(S("shbcqnmoar"), "", 1, 0, 1);
+    test(S("bdoshlmfin"), "ontrs", 1, 0, 1);
+    test(S("khfrebnsgq"), "pfkna", 1, 1, 1);
+    test(S("getcrsaoji"), "ekosa", 1, 2, 2);
+    test(S("fjiknedcpq"), "anqhk", 1, 4, 1);
+    test(S("tkejgnafrm"), "jekca", 1, 5, 4);
+    test(S("jnakolqrde"), "ikemsjgacf", 1, 0, 1);
+    test(S("lcjptsmgbe"), "arolgsjkhm", 1, 1, 1);
+    test(S("itfsmcjorl"), "oftkbldhre", 1, 5, 3);
+    test(S("omchkfrjea"), "gbkqdoeftl", 1, 9, 1);
+    test(S("cigfqkated"), "sqcflrgtim", 1, 10, 5);
+    test(S("tscenjikml"), "fmhbkislrjdpanogqcet", 1, 0, 1);
+    test(S("qcpaemsinf"), "rnioadktqlgpbcjsmhef", 1, 1, 1);
+    test(S("gltkojeipd"), "oakgtnldpsefihqmjcbr", 1, 10, 5);
+    test(S("qistfrgnmp"), "gbnaelosidmcjqktfhpr", 1, 19, 5);
+    test(S("bdnpfcqaem"), "akbripjhlosndcmqgfet", 1, 20, S::npos);
+    test(S("ectnhskflp"), "", 5, 0, 5);
+    test(S("fgtianblpq"), "pijag", 5, 0, 5);
+    test(S("mfeqklirnh"), "jrckd", 5, 1, 5);
+    test(S("astedncjhk"), "qcloh", 5, 2, 5);
+    test(S("fhlqgcajbr"), "thlmp", 5, 4, 5);
+    test(S("epfhocmdng"), "qidmo", 5, 5, 5);
+    test(S("apcnsibger"), "lnegpsjqrd", 5, 0, 5);
+    test(S("aqkocrbign"), "rjqdablmfs", 5, 1, 6);
+    test(S("ijsmdtqgce"), "enkgpbsjaq", 5, 5, 5);
+    test(S("clobgsrken"), "kdsgoaijfh", 5, 9, 6);
+    test(S("jbhcfposld"), "trfqgmckbe", 5, 10, 5);
+    test(S("oqnpblhide"), "igetsracjfkdnpoblhqm", 5, 0, 5);
+    test(S("lroeasctif"), "nqctfaogirshlekbdjpm", 5, 1, 5);
+    test(S("bpjlgmiedh"), "csehfgomljdqinbartkp", 5, 10, 6);
+    test(S("pamkeoidrj"), "qahoegcmplkfsjbdnitr", 5, 19, 8);
+    test(S("espogqbthk"), "dpteiajrqmsognhlfbkc", 5, 20, S::npos);
+    test(S("shoiedtcjb"), "", 9, 0, 9);
+    test(S("ebcinjgads"), "tqbnh", 9, 0, 9);
+    test(S("dqmregkcfl"), "akmle", 9, 1, 9);
+    test(S("ngcrieqajf"), "iqfkm", 9, 2, 9);
+    test(S("qosmilgnjb"), "tqjsr", 9, 4, 9);
+    test(S("ikabsjtdfl"), "jplqg", 9, 5, S::npos);
+    test(S("ersmicafdh"), "oilnrbcgtj", 9, 0, 9);
+    test(S("fdnplotmgh"), "morkglpesn", 9, 1, 9);
+    test(S("fdbicojerm"), "dmicerngat", 9, 5, S::npos);
+    test(S("mbtafndjcq"), "radgeskbtc", 9, 9, 9);
+    test(S("mlenkpfdtc"), "ljikprsmqo", 9, 10, 9);
+    test(S("ahlcifdqgs"), "trqihkcgsjamfdbolnpe", 9, 0, 9);
+    test(S("bgjemaltks"), "lqmthbsrekajgnofcipd", 9, 1, 9);
+    test(S("pdhslbqrfc"), "jtalmedribkgqsopcnfh", 9, 10, 9);
+    test(S("dirhtsnjkc"), "spqfoiclmtagejbndkrh", 9, 19, S::npos);
+    test(S("dlroktbcja"), "nmotklspigjrdhcfaebq", 9, 20, S::npos);
+    test(S("ncjpmaekbs"), "", 10, 0, S::npos);
+    test(S("hlbosgmrak"), "hpmsd", 10, 0, S::npos);
+    test(S("pqfhsgilen"), "qnpor", 10, 1, S::npos);
+    test(S("gqtjsbdckh"), "otdma", 10, 2, S::npos);
+    test(S("cfkqpjlegi"), "efhjg", 10, 4, S::npos);
+    test(S("beanrfodgj"), "odpte", 10, 5, S::npos);
+    test(S("adtkqpbjfi"), "bctdgfmolr", 10, 0, S::npos);
+    test(S("iomkfthagj"), "oaklidrbqg", 10, 1, S::npos);
+}
+
+template <class S>
+void test2()
+{
+    test(S("sdpcilonqj"), "dnjfsagktr", 10, 5, S::npos);
+    test(S("gtfbdkqeml"), "nejaktmiqg", 10, 9, S::npos);
+    test(S("bmeqgcdorj"), "pjqonlebsf", 10, 10, S::npos);
+    test(S("etqlcanmob"), "dshmnbtolcjepgaikfqr", 10, 0, S::npos);
+    test(S("roqmkbdtia"), "iogfhpabtjkqlrnemcds", 10, 1, S::npos);
+    test(S("kadsithljf"), "ngridfabjsecpqltkmoh", 10, 10, S::npos);
+    test(S("sgtkpbfdmh"), "athmknplcgofrqejsdib", 10, 19, S::npos);
+    test(S("qgmetnabkl"), "ldobhmqcafnjtkeisgrp", 10, 20, S::npos);
+    test(S("cqjohampgd"), "", 11, 0, S::npos);
+    test(S("hobitmpsan"), "aocjb", 11, 0, S::npos);
+    test(S("tjehkpsalm"), "jbrnk", 11, 1, S::npos);
+    test(S("ngfbojitcl"), "tqedg", 11, 2, S::npos);
+    test(S("rcfkdbhgjo"), "nqskp", 11, 4, S::npos);
+    test(S("qghptonrea"), "eaqkl", 11, 5, S::npos);
+    test(S("hnprfgqjdl"), "reaoicljqm", 11, 0, S::npos);
+    test(S("hlmgabenti"), "lsftgajqpm", 11, 1, S::npos);
+    test(S("ofcjanmrbs"), "rlpfogmits", 11, 5, S::npos);
+    test(S("jqedtkornm"), "shkncmiaqj", 11, 9, S::npos);
+    test(S("rfedlasjmg"), "fpnatrhqgs", 11, 10, S::npos);
+    test(S("talpqjsgkm"), "sjclemqhnpdbgikarfot", 11, 0, S::npos);
+    test(S("lrkcbtqpie"), "otcmedjikgsfnqbrhpla", 11, 1, S::npos);
+    test(S("cipogdskjf"), "bonsaefdqiprkhlgtjcm", 11, 10, S::npos);
+    test(S("nqedcojahi"), "egpscmahijlfnkrodqtb", 11, 19, S::npos);
+    test(S("hefnrkmctj"), "kmqbfepjthgilscrndoa", 11, 20, S::npos);
+    test(S("atqirnmekfjolhpdsgcb"), "", 0, 0, 0);
+    test(S("echfkmlpribjnqsaogtd"), "prboq", 0, 0, 0);
+    test(S("qnhiftdgcleajbpkrosm"), "fjcqh", 0, 1, 0);
+    test(S("chamfknorbedjitgslpq"), "fmosa", 0, 2, 0);
+    test(S("njhqpibfmtlkaecdrgso"), "qdbok", 0, 4, 0);
+    test(S("ebnghfsqkprmdcljoiat"), "amslg", 0, 5, 0);
+    test(S("letjomsgihfrpqbkancd"), "smpltjneqb", 0, 0, 0);
+    test(S("nblgoipcrqeaktshjdmf"), "flitskrnge", 0, 1, 0);
+    test(S("cehkbngtjoiflqapsmrd"), "pgqihmlbef", 0, 5, 0);
+    test(S("mignapfoklbhcqjetdrs"), "cfpdqjtgsb", 0, 9, 0);
+    test(S("ceatbhlsqjgpnokfrmdi"), "htpsiaflom", 0, 10, 0);
+    test(S("ocihkjgrdelpfnmastqb"), "kpjfiaceghsrdtlbnomq", 0, 0, 0);
+    test(S("noelgschdtbrjfmiqkap"), "qhtbomidljgafneksprc", 0, 1, 0);
+    test(S("dkclqfombepritjnghas"), "nhtjobkcefldimpsaqgr", 0, 10, 0);
+    test(S("miklnresdgbhqcojftap"), "prabcjfqnoeskilmtgdh", 0, 19, 11);
+    test(S("htbcigojaqmdkfrnlsep"), "dtrgmchilkasqoebfpjn", 0, 20, S::npos);
+    test(S("febhmqtjanokscdirpgl"), "", 1, 0, 1);
+    test(S("loakbsqjpcrdhftniegm"), "sqome", 1, 0, 1);
+    test(S("reagphsqflbitdcjmkno"), "smfte", 1, 1, 1);
+    test(S("jitlfrqemsdhkopncabg"), "ciboh", 1, 2, 2);
+    test(S("mhtaepscdnrjqgbkifol"), "haois", 1, 4, 2);
+    test(S("tocesrfmnglpbjihqadk"), "abfki", 1, 5, 1);
+    test(S("lpfmctjrhdagneskbqoi"), "frdkocntmq", 1, 0, 1);
+    test(S("lsmqaepkdhncirbtjfgo"), "oasbpedlnr", 1, 1, 1);
+    test(S("epoiqmtldrabnkjhcfsg"), "kltqmhgand", 1, 5, 1);
+    test(S("emgasrilpknqojhtbdcf"), "gdtfjchpmr", 1, 9, 3);
+    test(S("hnfiagdpcklrjetqbsom"), "ponmcqblet", 1, 10, 2);
+    test(S("nsdfebgajhmtricpoklq"), "sgphqdnofeiklatbcmjr", 1, 0, 1);
+    test(S("atjgfsdlpobmeiqhncrk"), "ljqprsmigtfoneadckbh", 1, 1, 1);
+    test(S("sitodfgnrejlahcbmqkp"), "ligeojhafnkmrcsqtbdp", 1, 10, 2);
+    test(S("fraghmbiceknltjpqosd"), "lsimqfnjarbopedkhcgt", 1, 19, 13);
+    test(S("pmafenlhqtdbkirjsogc"), "abedmfjlghniorcqptks", 1, 20, S::npos);
+    test(S("pihgmoeqtnakrjslcbfd"), "", 10, 0, 10);
+    test(S("gjdkeprctqblnhiafsom"), "hqtoa", 10, 0, 10);
+    test(S("mkpnblfdsahrcqijteog"), "cahif", 10, 1, 10);
+    test(S("gckarqnelodfjhmbptis"), "kehis", 10, 2, 10);
+    test(S("gqpskidtbclomahnrjfe"), "kdlmh", 10, 4, 11);
+    test(S("pkldjsqrfgitbhmaecno"), "paeql", 10, 5, 10);
+    test(S("aftsijrbeklnmcdqhgop"), "aghoqiefnb", 10, 0, 10);
+    test(S("mtlgdrhafjkbiepqnsoc"), "jrbqaikpdo", 10, 1, 10);
+    test(S("pqgirnaefthokdmbsclj"), "smjonaeqcl", 10, 5, 10);
+    test(S("kpdbgjmtherlsfcqoina"), "eqbdrkcfah", 10, 9, 11);
+    test(S("jrlbothiknqmdgcfasep"), "kapmsienhf", 10, 10, 10);
+    test(S("mjogldqferckabinptsh"), "jpqotrlenfcsbhkaimdg", 10, 0, 10);
+    test(S("apoklnefbhmgqcdrisjt"), "jlbmhnfgtcqprikeados", 10, 1, 10);
+    test(S("ifeopcnrjbhkdgatmqls"), "stgbhfmdaljnpqoicker", 10, 10, 11);
+    test(S("ckqhaiesmjdnrgolbtpf"), "oihcetflbjagdsrkmqpn", 10, 19, 11);
+    test(S("bnlgapfimcoterskqdjh"), "adtclebmnpjsrqfkigoh", 10, 20, S::npos);
+    test(S("kgdlrobpmjcthqsafeni"), "", 19, 0, 19);
+    test(S("dfkechomjapgnslbtqir"), "beafg", 19, 0, 19);
+    test(S("rloadknfbqtgmhcsipje"), "iclat", 19, 1, 19);
+    test(S("mgjhkolrnadqbpetcifs"), "rkhnf", 19, 2, 19);
+    test(S("cmlfakiojdrgtbsphqen"), "clshq", 19, 4, 19);
+    test(S("kghbfipeomsntdalrqjc"), "dtcoj", 19, 5, S::npos);
+    test(S("eldiqckrnmtasbghjfpo"), "rqosnjmfth", 19, 0, 19);
+    test(S("abqjcfedgotihlnspkrm"), "siatdfqglh", 19, 1, 19);
+    test(S("qfbadrtjsimkolcenhpg"), "mrlshtpgjq", 19, 5, 19);
+    test(S("abseghclkjqifmtodrnp"), "adlcskgqjt", 19, 9, 19);
+    test(S("ibmsnlrjefhtdokacqpg"), "drshcjknaf", 19, 10, 19);
+    test(S("mrkfciqjebaponsthldg"), "etsaqroinghpkjdlfcbm", 19, 0, 19);
+    test(S("mjkticdeoqshpalrfbgn"), "sgepdnkqliambtrocfhj", 19, 1, 19);
+    test(S("rqnoclbdejgiphtfsakm"), "nlmcjaqgbsortfdihkpe", 19, 10, S::npos);
+    test(S("plkqbhmtfaeodjcrsing"), "racfnpmosldibqkghjet", 19, 19, S::npos);
+    test(S("oegalhmstjrfickpbndq"), "fjhdsctkqeiolagrnmbp", 19, 20, S::npos);
+    test(S("rdtgjcaohpblniekmsfq"), "", 20, 0, S::npos);
+    test(S("ofkqbnjetrmsaidphglc"), "ejanp", 20, 0, S::npos);
+    test(S("grkpahljcftesdmonqib"), "odife", 20, 1, S::npos);
+    test(S("jimlgbhfqkteospardcn"), "okaqd", 20, 2, S::npos);
+    test(S("gftenihpmslrjkqadcob"), "lcdbi", 20, 4, S::npos);
+    test(S("bmhldogtckrfsanijepq"), "fsqbj", 20, 5, S::npos);
+    test(S("nfqkrpjdesabgtlcmoih"), "bigdomnplq", 20, 0, S::npos);
+    test(S("focalnrpiqmdkstehbjg"), "apiblotgcd", 20, 1, S::npos);
+    test(S("rhqdspkmebiflcotnjga"), "acfhdenops", 20, 5, S::npos);
+    test(S("rahdtmsckfboqlpniegj"), "jopdeamcrk", 20, 9, S::npos);
+    test(S("fbkeiopclstmdqranjhg"), "trqncbkgmh", 20, 10, S::npos);
+    test(S("lifhpdgmbconstjeqark"), "tomglrkencbsfjqpihda", 20, 0, S::npos);
+}
+
+template <class S>
+void test3()
+{
+    test(S("pboqganrhedjmltsicfk"), "gbkhdnpoietfcmrslajq", 20, 1, S::npos);
+    test(S("klchabsimetjnqgorfpd"), "rtfnmbsglkjaichoqedp", 20, 10, S::npos);
+    test(S("sirfgmjqhctndbklaepo"), "ohkmdpfqbsacrtjnlgei", 20, 19, S::npos);
+    test(S("rlbdsiceaonqjtfpghkm"), "dlbrteoisgphmkncajfq", 20, 20, S::npos);
+    test(S("ecgdanriptblhjfqskom"), "", 21, 0, S::npos);
+    test(S("fdmiarlpgcskbhoteqjn"), "sjrlo", 21, 0, S::npos);
+    test(S("rlbstjqopignecmfadkh"), "qjpor", 21, 1, S::npos);
+    test(S("grjpqmbshektdolcafni"), "odhfn", 21, 2, S::npos);
+    test(S("sakfcohtqnibprjmlged"), "qtfin", 21, 4, S::npos);
+    test(S("mjtdglasihqpocebrfkn"), "hpqfo", 21, 5, S::npos);
+    test(S("okaplfrntghqbmeicsdj"), "fabmertkos", 21, 0, S::npos);
+    test(S("sahngemrtcjidqbklfpo"), "brqtgkmaej", 21, 1, S::npos);
+    test(S("dlmsipcnekhbgoaftqjr"), "nfrdeihsgl", 21, 5, S::npos);
+    test(S("ahegrmqnoiklpfsdbcjt"), "hlfrosekpi", 21, 9, S::npos);
+    test(S("hdsjbnmlegtkqripacof"), "atgbkrjdsm", 21, 10, S::npos);
+    test(S("pcnedrfjihqbalkgtoms"), "blnrptjgqmaifsdkhoec", 21, 0, S::npos);
+    test(S("qjidealmtpskrbfhocng"), "ctpmdahebfqjgknloris", 21, 1, S::npos);
+    test(S("qeindtagmokpfhsclrbj"), "apnkeqthrmlbfodiscgj", 21, 10, S::npos);
+    test(S("kpfegbjhsrnodltqciam"), "jdgictpframeoqlsbknh", 21, 19, S::npos);
+    test(S("hnbrcplsjfgiktoedmaq"), "qprlsfojamgndekthibc", 21, 20, S::npos);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test0<S>();
+    test1<S>();
+    test2<S>();
+    test3<S>();
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.find_first_not_of( "",      0, 0) == SV::npos, "" );
+    static_assert (sv1.find_first_not_of( "irkhs", 0, 5) == SV::npos, "" );
+    static_assert (sv2.find_first_not_of( "",      0, 0) == 0, "" );
+    static_assert (sv2.find_first_not_of( "gfsrt", 0, 5) == 0, "" );
+    static_assert (sv2.find_first_not_of( "lecar", 0, 5) == 1, "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.find/find_first_not_of_string_view_size.pass.cpp

@@ -0,0 +1,148 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// size_type find_first_not_of(const basic_string& str, size_type pos = 0) const;
+
+#include <string_view>
+#include <cassert>
+
+template <class S>
+void
+test(const S& s, const S& str, typename S::size_type pos, typename S::size_type x)
+{
+    assert(s.find_first_not_of(str, pos) == x);
+    if (x != S::npos)
+        assert(pos <= x && x < s.size());
+}
+
+template <class S>
+void
+test(const S& s, const S& str, typename S::size_type x)
+{
+    assert(s.find_first_not_of(str) == x);
+    if (x != S::npos)
+        assert(x < s.size());
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), S(""), 0, S::npos);
+    test(S(""), S("laenf"), 0, S::npos);
+    test(S(""), S("pqlnkmbdjo"), 0, S::npos);
+    test(S(""), S("qkamfogpnljdcshbreti"), 0, S::npos);
+    test(S(""), S(""), 1, S::npos);
+    test(S(""), S("bjaht"), 1, S::npos);
+    test(S(""), S("hjlcmgpket"), 1, S::npos);
+    test(S(""), S("htaobedqikfplcgjsmrn"), 1, S::npos);
+    test(S("fodgq"), S(""), 0, 0);
+    test(S("qanej"), S("dfkap"), 0, 0);
+    test(S("clbao"), S("ihqrfebgad"), 0, 0);
+    test(S("mekdn"), S("ngtjfcalbseiqrphmkdo"), 0, S::npos);
+    test(S("srdfq"), S(""), 1, 1);
+    test(S("oemth"), S("ikcrq"), 1, 1);
+    test(S("cdaih"), S("dmajblfhsg"), 1, 3);
+    test(S("qohtk"), S("oqftjhdmkgsblacenirp"), 1, S::npos);
+    test(S("cshmd"), S(""), 2, 2);
+    test(S("lhcdo"), S("oebqi"), 2, 2);
+    test(S("qnsoh"), S("kojhpmbsfe"), 2, S::npos);
+    test(S("pkrof"), S("acbsjqogpltdkhinfrem"), 2, S::npos);
+    test(S("fmtsp"), S(""), 4, 4);
+    test(S("khbpm"), S("aobjd"), 4, 4);
+    test(S("pbsji"), S("pcbahntsje"), 4, 4);
+    test(S("mprdj"), S("fhepcrntkoagbmldqijs"), 4, S::npos);
+    test(S("eqmpa"), S(""), 5, S::npos);
+    test(S("omigs"), S("kocgb"), 5, S::npos);
+    test(S("onmje"), S("fbslrjiqkm"), 5, S::npos);
+    test(S("oqmrj"), S("jeidpcmalhfnqbgtrsko"), 5, S::npos);
+    test(S("schfa"), S(""), 6, S::npos);
+    test(S("igdsc"), S("qngpd"), 6, S::npos);
+    test(S("brqgo"), S("rodhqklgmb"), 6, S::npos);
+    test(S("tnrph"), S("thdjgafrlbkoiqcspmne"), 6, S::npos);
+    test(S("hcjitbfapl"), S(""), 0, 0);
+    test(S("daiprenocl"), S("ashjd"), 0, 2);
+    test(S("litpcfdghe"), S("mgojkldsqh"), 0, 1);
+    test(S("aidjksrolc"), S("imqnaghkfrdtlopbjesc"), 0, S::npos);
+    test(S("qpghtfbaji"), S(""), 1, 1);
+    test(S("gfshlcmdjr"), S("nadkh"), 1, 1);
+    test(S("nkodajteqp"), S("ofdrqmkebl"), 1, 4);
+    test(S("gbmetiprqd"), S("bdfjqgatlksriohemnpc"), 1, S::npos);
+    test(S("crnklpmegd"), S(""), 5, 5);
+    test(S("jsbtafedoc"), S("prqgn"), 5, 5);
+    test(S("qnmodrtkeb"), S("pejafmnokr"), 5, 6);
+    test(S("cpebqsfmnj"), S("odnqkgijrhabfmcestlp"), 5, S::npos);
+    test(S("lmofqdhpki"), S(""), 9, 9);
+    test(S("hnefkqimca"), S("rtjpa"), 9, S::npos);
+    test(S("drtasbgmfp"), S("ktsrmnqagd"), 9, 9);
+    test(S("lsaijeqhtr"), S("rtdhgcisbnmoaqkfpjle"), 9, S::npos);
+    test(S("elgofjmbrq"), S(""), 10, S::npos);
+    test(S("mjqdgalkpc"), S("dplqa"), 10, S::npos);
+    test(S("kthqnfcerm"), S("dkacjoptns"), 10, S::npos);
+    test(S("dfsjhanorc"), S("hqfimtrgnbekpdcsjalo"), 10, S::npos);
+    test(S("eqsgalomhb"), S(""), 11, S::npos);
+    test(S("akiteljmoh"), S("lofbc"), 11, S::npos);
+    test(S("hlbdfreqjo"), S("astoegbfpn"), 11, S::npos);
+    test(S("taqobhlerg"), S("pdgreqomsncafklhtibj"), 11, S::npos);
+    test(S("snafbdlghrjkpqtoceim"), S(""), 0, 0);
+    test(S("aemtbrgcklhndjisfpoq"), S("lbtqd"), 0, 0);
+    test(S("pnracgfkjdiholtbqsem"), S("tboimldpjh"), 0, 1);
+    test(S("dicfltehbsgrmojnpkaq"), S("slcerthdaiqjfnobgkpm"), 0, S::npos);
+    test(S("jlnkraeodhcspfgbqitm"), S(""), 1, 1);
+    test(S("lhosrngtmfjikbqpcade"), S("aqibs"), 1, 1);
+    test(S("rbtaqjhgkneisldpmfoc"), S("gtfblmqinc"), 1, 3);
+    test(S("gpifsqlrdkbonjtmheca"), S("mkqpbtdalgniorhfescj"), 1, S::npos);
+    test(S("hdpkobnsalmcfijregtq"), S(""), 10, 10);
+    test(S("jtlshdgqaiprkbcoenfm"), S("pblas"), 10, 11);
+    test(S("fkdrbqltsgmcoiphneaj"), S("arosdhcfme"), 10, 13);
+    test(S("crsplifgtqedjohnabmk"), S("blkhjeogicatqfnpdmsr"), 10, S::npos);
+    test(S("niptglfbosehkamrdqcj"), S(""), 19, 19);
+    test(S("copqdhstbingamjfkler"), S("djkqc"), 19, 19);
+    test(S("mrtaefilpdsgocnhqbjk"), S("lgokshjtpb"), 19, S::npos);
+    test(S("kojatdhlcmigpbfrqnes"), S("bqjhtkfepimcnsgrlado"), 19, S::npos);
+    test(S("eaintpchlqsbdgrkjofm"), S(""), 20, S::npos);
+    test(S("gjnhidfsepkrtaqbmclo"), S("nocfa"), 20, S::npos);
+    test(S("spocfaktqdbiejlhngmr"), S("bgtajmiedc"), 20, S::npos);
+    test(S("rphmlekgfscndtaobiqj"), S("lsckfnqgdahejiopbtmr"), 20, S::npos);
+    test(S("liatsqdoegkmfcnbhrpj"), S(""), 21, S::npos);
+    test(S("binjagtfldkrspcomqeh"), S("gfsrt"), 21, S::npos);
+    test(S("latkmisecnorjbfhqpdg"), S("pfsocbhjtm"), 21, S::npos);
+    test(S("lecfratdjkhnsmqpoigb"), S("tpflmdnoicjgkberhqsa"), 21, S::npos);
+}
+
+template <class S>
+void test1()
+{
+    test(S(""), S(""), S::npos);
+    test(S(""), S("laenf"), S::npos);
+    test(S(""), S("pqlnkmbdjo"), S::npos);
+    test(S(""), S("qkamfogpnljdcshbreti"), S::npos);
+    test(S("nhmko"), S(""), 0);
+    test(S("lahfb"), S("irkhs"), 0);
+    test(S("gmfhd"), S("kantesmpgj"), 2);
+    test(S("odaft"), S("oknlrstdpiqmjbaghcfe"), S::npos);
+    test(S("eolhfgpjqk"), S(""), 0);
+    test(S("nbatdlmekr"), S("bnrpe"), 2);
+    test(S("jdmciepkaq"), S("jtdaefblso"), 2);
+    test(S("hkbgspoflt"), S("oselktgbcapndfjihrmq"), S::npos);
+    test(S("gprdcokbnjhlsfmtieqa"), S(""), 0);
+    test(S("qjghlnftcaismkropdeb"), S("bjaht"), 0);
+    test(S("pnalfrdtkqcmojiesbhg"), S("hjlcmgpket"), 1);
+    test(S("pniotcfrhqsmgdkjbael"), S("htaobedqikfplcgjsmrn"), S::npos);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test0<S>();
+    test1<S>();
+    }
+}

test/std/strings/string.view/string.view.find/find_first_of_char_size.pass.cpp

@@ -0,0 +1,82 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// constexpr size_type find_first_of(charT c, size_type pos = 0) const;
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, typename S::value_type c, typename S::size_type pos,
+     typename S::size_type x)
+{
+    assert(s.find_first_of(c, pos) == x);
+    if (x != S::npos)
+        assert(pos <= x && x < s.size());
+}
+
+template <class S>
+void
+test(const S& s, typename S::value_type c, typename S::size_type x)
+{
+    assert(s.find_first_of(c) == x);
+    if (x != S::npos)
+        assert(x < s.size());
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test(S(""), 'e', 0, S::npos);
+    test(S(""), 'e', 1, S::npos);
+    test(S("kitcj"), 'e', 0, S::npos);
+    test(S("qkamf"), 'e', 1, S::npos);
+    test(S("nhmko"), 'e', 2, S::npos);
+    test(S("tpsaf"), 'e', 4, S::npos);
+    test(S("lahfb"), 'e', 5, S::npos);
+    test(S("irkhs"), 'e', 6, S::npos);
+    test(S("gmfhdaipsr"), 'e', 0, S::npos);
+    test(S("kantesmpgj"), 'e', 1, 4);
+    test(S("odaftiegpm"), 'e', 5, 6);
+    test(S("oknlrstdpi"), 'e', 9, S::npos);
+    test(S("eolhfgpjqk"), 'e', 10, S::npos);
+    test(S("pcdrofikas"), 'e', 11, S::npos);
+    test(S("nbatdlmekrgcfqsophij"), 'e', 0, 7);
+    test(S("bnrpehidofmqtcksjgla"), 'e', 1, 4);
+    test(S("jdmciepkaqgotsrfnhlb"), 'e', 10, S::npos);
+    test(S("jtdaefblsokrmhpgcnqi"), 'e', 19, S::npos);
+    test(S("hkbgspofltajcnedqmri"), 'e', 20, S::npos);
+    test(S("oselktgbcapndfjihrmq"), 'e', 21, S::npos);
+
+    test(S(""), 'e', S::npos);
+    test(S("csope"), 'e', 4);
+    test(S("gfsmthlkon"), 'e', S::npos);
+    test(S("laenfsbridchgotmkqpj"), 'e', 2);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.find_first_of( 'e', 0 ) == SV::npos, "" );
+    static_assert (sv1.find_first_of( 'e', 1 ) == SV::npos, "" );
+    static_assert (sv2.find_first_of( 'q', 0 ) == SV::npos, "" );
+    static_assert (sv2.find_first_of( 'e', 1 ) == 4, "" );
+    static_assert (sv2.find_first_of( 'e', 5 ) == SV::npos, "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.find/find_first_of_pointer_size.pass.cpp

@@ -0,0 +1,165 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// constexpr size_type find_first_of(const charT* s, size_type pos = 0) const;
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type pos,
+     typename S::size_type x)
+{
+    assert(s.find_first_of(str, pos) == x);
+    if (x != S::npos)
+        assert(pos <= x && x < s.size());
+}
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type x)
+{
+    assert(s.find_first_of(str) == x);
+    if (x != S::npos)
+        assert(x < s.size());
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), "", 0, S::npos);
+    test(S(""), "laenf", 0, S::npos);
+    test(S(""), "pqlnkmbdjo", 0, S::npos);
+    test(S(""), "qkamfogpnljdcshbreti", 0, S::npos);
+    test(S(""), "", 1, S::npos);
+    test(S(""), "bjaht", 1, S::npos);
+    test(S(""), "hjlcmgpket", 1, S::npos);
+    test(S(""), "htaobedqikfplcgjsmrn", 1, S::npos);
+    test(S("fodgq"), "", 0, S::npos);
+    test(S("qanej"), "dfkap", 0, 1);
+    test(S("clbao"), "ihqrfebgad", 0, 2);
+    test(S("mekdn"), "ngtjfcalbseiqrphmkdo", 0, 0);
+    test(S("srdfq"), "", 1, S::npos);
+    test(S("oemth"), "ikcrq", 1, S::npos);
+    test(S("cdaih"), "dmajblfhsg", 1, 1);
+    test(S("qohtk"), "oqftjhdmkgsblacenirp", 1, 1);
+    test(S("cshmd"), "", 2, S::npos);
+    test(S("lhcdo"), "oebqi", 2, 4);
+    test(S("qnsoh"), "kojhpmbsfe", 2, 2);
+    test(S("pkrof"), "acbsjqogpltdkhinfrem", 2, 2);
+    test(S("fmtsp"), "", 4, S::npos);
+    test(S("khbpm"), "aobjd", 4, S::npos);
+    test(S("pbsji"), "pcbahntsje", 4, S::npos);
+    test(S("mprdj"), "fhepcrntkoagbmldqijs", 4, 4);
+    test(S("eqmpa"), "", 5, S::npos);
+    test(S("omigs"), "kocgb", 5, S::npos);
+    test(S("onmje"), "fbslrjiqkm", 5, S::npos);
+    test(S("oqmrj"), "jeidpcmalhfnqbgtrsko", 5, S::npos);
+    test(S("schfa"), "", 6, S::npos);
+    test(S("igdsc"), "qngpd", 6, S::npos);
+    test(S("brqgo"), "rodhqklgmb", 6, S::npos);
+    test(S("tnrph"), "thdjgafrlbkoiqcspmne", 6, S::npos);
+    test(S("hcjitbfapl"), "", 0, S::npos);
+    test(S("daiprenocl"), "ashjd", 0, 0);
+    test(S("litpcfdghe"), "mgojkldsqh", 0, 0);
+    test(S("aidjksrolc"), "imqnaghkfrdtlopbjesc", 0, 0);
+    test(S("qpghtfbaji"), "", 1, S::npos);
+    test(S("gfshlcmdjr"), "nadkh", 1, 3);
+    test(S("nkodajteqp"), "ofdrqmkebl", 1, 1);
+    test(S("gbmetiprqd"), "bdfjqgatlksriohemnpc", 1, 1);
+    test(S("crnklpmegd"), "", 5, S::npos);
+    test(S("jsbtafedoc"), "prqgn", 5, S::npos);
+    test(S("qnmodrtkeb"), "pejafmnokr", 5, 5);
+    test(S("cpebqsfmnj"), "odnqkgijrhabfmcestlp", 5, 5);
+    test(S("lmofqdhpki"), "", 9, S::npos);
+    test(S("hnefkqimca"), "rtjpa", 9, 9);
+    test(S("drtasbgmfp"), "ktsrmnqagd", 9, S::npos);
+    test(S("lsaijeqhtr"), "rtdhgcisbnmoaqkfpjle", 9, 9);
+    test(S("elgofjmbrq"), "", 10, S::npos);
+    test(S("mjqdgalkpc"), "dplqa", 10, S::npos);
+    test(S("kthqnfcerm"), "dkacjoptns", 10, S::npos);
+    test(S("dfsjhanorc"), "hqfimtrgnbekpdcsjalo", 10, S::npos);
+    test(S("eqsgalomhb"), "", 11, S::npos);
+    test(S("akiteljmoh"), "lofbc", 11, S::npos);
+    test(S("hlbdfreqjo"), "astoegbfpn", 11, S::npos);
+    test(S("taqobhlerg"), "pdgreqomsncafklhtibj", 11, S::npos);
+    test(S("snafbdlghrjkpqtoceim"), "", 0, S::npos);
+    test(S("aemtbrgcklhndjisfpoq"), "lbtqd", 0, 3);
+    test(S("pnracgfkjdiholtbqsem"), "tboimldpjh", 0, 0);
+    test(S("dicfltehbsgrmojnpkaq"), "slcerthdaiqjfnobgkpm", 0, 0);
+    test(S("jlnkraeodhcspfgbqitm"), "", 1, S::npos);
+    test(S("lhosrngtmfjikbqpcade"), "aqibs", 1, 3);
+    test(S("rbtaqjhgkneisldpmfoc"), "gtfblmqinc", 1, 1);
+    test(S("gpifsqlrdkbonjtmheca"), "mkqpbtdalgniorhfescj", 1, 1);
+    test(S("hdpkobnsalmcfijregtq"), "", 10, S::npos);
+    test(S("jtlshdgqaiprkbcoenfm"), "pblas", 10, 10);
+    test(S("fkdrbqltsgmcoiphneaj"), "arosdhcfme", 10, 10);
+    test(S("crsplifgtqedjohnabmk"), "blkhjeogicatqfnpdmsr", 10, 10);
+    test(S("niptglfbosehkamrdqcj"), "", 19, S::npos);
+    test(S("copqdhstbingamjfkler"), "djkqc", 19, S::npos);
+    test(S("mrtaefilpdsgocnhqbjk"), "lgokshjtpb", 19, 19);
+    test(S("kojatdhlcmigpbfrqnes"), "bqjhtkfepimcnsgrlado", 19, 19);
+    test(S("eaintpchlqsbdgrkjofm"), "", 20, S::npos);
+    test(S("gjnhidfsepkrtaqbmclo"), "nocfa", 20, S::npos);
+    test(S("spocfaktqdbiejlhngmr"), "bgtajmiedc", 20, S::npos);
+    test(S("rphmlekgfscndtaobiqj"), "lsckfnqgdahejiopbtmr", 20, S::npos);
+    test(S("liatsqdoegkmfcnbhrpj"), "", 21, S::npos);
+    test(S("binjagtfldkrspcomqeh"), "gfsrt", 21, S::npos);
+    test(S("latkmisecnorjbfhqpdg"), "pfsocbhjtm", 21, S::npos);
+    test(S("lecfratdjkhnsmqpoigb"), "tpflmdnoicjgkberhqsa", 21, S::npos);
+}
+
+template <class S>
+void test1()
+{
+    test(S(""), "", S::npos);
+    test(S(""), "laenf", S::npos);
+    test(S(""), "pqlnkmbdjo", S::npos);
+    test(S(""), "qkamfogpnljdcshbreti", S::npos);
+    test(S("nhmko"), "", S::npos);
+    test(S("lahfb"), "irkhs", 2);
+    test(S("gmfhd"), "kantesmpgj", 0);
+    test(S("odaft"), "oknlrstdpiqmjbaghcfe", 0);
+    test(S("eolhfgpjqk"), "", S::npos);
+    test(S("nbatdlmekr"), "bnrpe", 0);
+    test(S("jdmciepkaq"), "jtdaefblso", 0);
+    test(S("hkbgspoflt"), "oselktgbcapndfjihrmq", 0);
+    test(S("gprdcokbnjhlsfmtieqa"), "", S::npos);
+    test(S("qjghlnftcaismkropdeb"), "bjaht", 1);
+    test(S("pnalfrdtkqcmojiesbhg"), "hjlcmgpket", 0);
+    test(S("pniotcfrhqsmgdkjbael"), "htaobedqikfplcgjsmrn", 0);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test0<S>();
+    test1<S>();
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.find_first_of( "",      0) == SV::npos, "" );
+    static_assert (sv1.find_first_of( "irkhs", 0) == SV::npos, "" );
+    static_assert (sv2.find_first_of( "",      0) == SV::npos, "" );
+    static_assert (sv2.find_first_of( "gfsrt", 0) == SV::npos, "" );
+    static_assert (sv2.find_first_of( "lecar", 0) == 0, "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.find/find_first_of_pointer_size_size.pass.cpp

@@ -0,0 +1,392 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// constexpr size_type find_first_of(const charT* s, size_type pos, size_type n) const;
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type pos,
+     typename S::size_type n, typename S::size_type x)
+{
+    assert(s.find_first_of(str, pos, n) == x);
+    if (x != S::npos)
+        assert(pos <= x && x < s.size());
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), "", 0, 0, S::npos);
+    test(S(""), "irkhs", 0, 0, S::npos);
+    test(S(""), "kante", 0, 1, S::npos);
+    test(S(""), "oknlr", 0, 2, S::npos);
+    test(S(""), "pcdro", 0, 4, S::npos);
+    test(S(""), "bnrpe", 0, 5, S::npos);
+    test(S(""), "jtdaefblso", 0, 0, S::npos);
+    test(S(""), "oselktgbca", 0, 1, S::npos);
+    test(S(""), "eqgaplhckj", 0, 5, S::npos);
+    test(S(""), "bjahtcmnlp", 0, 9, S::npos);
+    test(S(""), "hjlcmgpket", 0, 10, S::npos);
+    test(S(""), "htaobedqikfplcgjsmrn", 0, 0, S::npos);
+    test(S(""), "hpqiarojkcdlsgnmfetb", 0, 1, S::npos);
+    test(S(""), "dfkaprhjloqetcsimnbg", 0, 10, S::npos);
+    test(S(""), "ihqrfebgadntlpmjksoc", 0, 19, S::npos);
+    test(S(""), "ngtjfcalbseiqrphmkdo", 0, 20, S::npos);
+    test(S(""), "", 1, 0, S::npos);
+    test(S(""), "lbtqd", 1, 0, S::npos);
+    test(S(""), "tboim", 1, 1, S::npos);
+    test(S(""), "slcer", 1, 2, S::npos);
+    test(S(""), "cbjfs", 1, 4, S::npos);
+    test(S(""), "aqibs", 1, 5, S::npos);
+    test(S(""), "gtfblmqinc", 1, 0, S::npos);
+    test(S(""), "mkqpbtdalg", 1, 1, S::npos);
+    test(S(""), "kphatlimcd", 1, 5, S::npos);
+    test(S(""), "pblasqogic", 1, 9, S::npos);
+    test(S(""), "arosdhcfme", 1, 10, S::npos);
+    test(S(""), "blkhjeogicatqfnpdmsr", 1, 0, S::npos);
+    test(S(""), "bmhineprjcoadgstflqk", 1, 1, S::npos);
+    test(S(""), "djkqcmetslnghpbarfoi", 1, 10, S::npos);
+    test(S(""), "lgokshjtpbemarcdqnfi", 1, 19, S::npos);
+    test(S(""), "bqjhtkfepimcnsgrlado", 1, 20, S::npos);
+    test(S("eaint"), "", 0, 0, S::npos);
+    test(S("binja"), "gfsrt", 0, 0, S::npos);
+    test(S("latkm"), "pfsoc", 0, 1, S::npos);
+    test(S("lecfr"), "tpflm", 0, 2, S::npos);
+    test(S("eqkst"), "sgkec", 0, 4, 0);
+    test(S("cdafr"), "romds", 0, 5, 1);
+    test(S("prbhe"), "qhjistlgmr", 0, 0, S::npos);
+    test(S("lbisk"), "pedfirsglo", 0, 1, S::npos);
+    test(S("hrlpd"), "aqcoslgrmk", 0, 5, S::npos);
+    test(S("ehmja"), "dabckmepqj", 0, 9, 0);
+    test(S("mhqgd"), "pqscrjthli", 0, 10, 1);
+    test(S("tgklq"), "kfphdcsjqmobliagtren", 0, 0, S::npos);
+    test(S("bocjs"), "rokpefncljibsdhqtagm", 0, 1, S::npos);
+    test(S("grbsd"), "afionmkphlebtcjqsgrd", 0, 10, S::npos);
+    test(S("ofjqr"), "aenmqplidhkofrjbctsg", 0, 19, 0);
+    test(S("btlfi"), "osjmbtcadhiklegrpqnf", 0, 20, 0);
+    test(S("clrgb"), "", 1, 0, S::npos);
+    test(S("tjmek"), "osmia", 1, 0, S::npos);
+    test(S("bgstp"), "ckonl", 1, 1, S::npos);
+    test(S("hstrk"), "ilcaj", 1, 2, S::npos);
+    test(S("kmspj"), "lasiq", 1, 4, 2);
+    test(S("tjboh"), "kfqmr", 1, 5, S::npos);
+    test(S("ilbcj"), "klnitfaobg", 1, 0, S::npos);
+    test(S("jkngf"), "gjhmdlqikp", 1, 1, 3);
+    test(S("gfcql"), "skbgtahqej", 1, 5, S::npos);
+    test(S("dqtlg"), "bjsdgtlpkf", 1, 9, 2);
+    test(S("bthpg"), "bjgfmnlkio", 1, 10, 4);
+    test(S("dgsnq"), "lbhepotfsjdqigcnamkr", 1, 0, S::npos);
+    test(S("rmfhp"), "tebangckmpsrqdlfojhi", 1, 1, S::npos);
+    test(S("jfdam"), "joflqbdkhtegimscpanr", 1, 10, 1);
+    test(S("edapb"), "adpmcohetfbsrjinlqkg", 1, 19, 1);
+    test(S("brfsm"), "iacldqjpfnogbsrhmetk", 1, 20, 1);
+    test(S("ndrhl"), "", 2, 0, S::npos);
+    test(S("mrecp"), "otkgb", 2, 0, S::npos);
+    test(S("qlasf"), "cqsjl", 2, 1, S::npos);
+    test(S("smaqd"), "dpifl", 2, 2, 4);
+    test(S("hjeni"), "oapht", 2, 4, S::npos);
+    test(S("ocmfj"), "cifts", 2, 5, 3);
+    test(S("hmftq"), "nmsckbgalo", 2, 0, S::npos);
+    test(S("fklad"), "tpksqhamle", 2, 1, S::npos);
+    test(S("dirnm"), "tpdrchmkji", 2, 5, 2);
+    test(S("hrgdc"), "ijagfkblst", 2, 9, 2);
+    test(S("ifakg"), "kpocsignjb", 2, 10, 3);
+    test(S("ebrgd"), "pecqtkjsnbdrialgmohf", 2, 0, S::npos);
+    test(S("rcjml"), "aiortphfcmkjebgsndql", 2, 1, S::npos);
+    test(S("peqmt"), "sdbkeamglhipojqftrcn", 2, 10, 3);
+    test(S("frehn"), "ljqncehgmfktroapidbs", 2, 19, 2);
+    test(S("tqolf"), "rtcfodilamkbenjghqps", 2, 20, 2);
+    test(S("cjgao"), "", 4, 0, S::npos);
+    test(S("kjplq"), "mabns", 4, 0, S::npos);
+    test(S("herni"), "bdnrp", 4, 1, S::npos);
+    test(S("tadrb"), "scidp", 4, 2, S::npos);
+    test(S("pkfeo"), "agbjl", 4, 4, S::npos);
+    test(S("hoser"), "jfmpr", 4, 5, 4);
+    test(S("kgrsp"), "rbpefghsmj", 4, 0, S::npos);
+    test(S("pgejb"), "apsfntdoqc", 4, 1, S::npos);
+    test(S("thlnq"), "ndkjeisgcl", 4, 5, S::npos);
+    test(S("nbmit"), "rnfpqatdeo", 4, 9, 4);
+    test(S("jgmib"), "bntjlqrfik", 4, 10, 4);
+    test(S("ncrfj"), "kcrtmpolnaqejghsfdbi", 4, 0, S::npos);
+    test(S("ncsik"), "lobheanpkmqidsrtcfgj", 4, 1, S::npos);
+    test(S("sgbfh"), "athdkljcnreqbgpmisof", 4, 10, 4);
+    test(S("dktbn"), "qkdmjialrscpbhefgont", 4, 19, 4);
+    test(S("fthqm"), "dmasojntqleribkgfchp", 4, 20, 4);
+    test(S("klopi"), "", 5, 0, S::npos);
+    test(S("dajhn"), "psthd", 5, 0, S::npos);
+    test(S("jbgno"), "rpmjd", 5, 1, S::npos);
+    test(S("hkjae"), "dfsmk", 5, 2, S::npos);
+}
+
+template <class S>
+void test1()
+{
+    test(S("gbhqo"), "skqne", 5, 4, S::npos);
+    test(S("ktdor"), "kipnf", 5, 5, S::npos);
+    test(S("ldprn"), "hmrnqdgifl", 5, 0, S::npos);
+    test(S("egmjk"), "fsmjcdairn", 5, 1, S::npos);
+    test(S("armql"), "pcdgltbrfj", 5, 5, S::npos);
+    test(S("cdhjo"), "aekfctpirg", 5, 9, S::npos);
+    test(S("jcons"), "ledihrsgpf", 5, 10, S::npos);
+    test(S("cbrkp"), "mqcklahsbtirgopefndj", 5, 0, S::npos);
+    test(S("fhgna"), "kmlthaoqgecrnpdbjfis", 5, 1, S::npos);
+    test(S("ejfcd"), "sfhbamcdptojlkrenqgi", 5, 10, S::npos);
+    test(S("kqjhe"), "pbniofmcedrkhlstgaqj", 5, 19, S::npos);
+    test(S("pbdjl"), "mongjratcskbhqiepfdl", 5, 20, S::npos);
+    test(S("gajqn"), "", 6, 0, S::npos);
+    test(S("stedk"), "hrnat", 6, 0, S::npos);
+    test(S("tjkaf"), "gsqdt", 6, 1, S::npos);
+    test(S("dthpe"), "bspkd", 6, 2, S::npos);
+    test(S("klhde"), "ohcmb", 6, 4, S::npos);
+    test(S("bhlki"), "heatr", 6, 5, S::npos);
+    test(S("lqmoh"), "pmblckedfn", 6, 0, S::npos);
+    test(S("mtqin"), "aceqmsrbik", 6, 1, S::npos);
+    test(S("dpqbr"), "lmbtdehjrn", 6, 5, S::npos);
+    test(S("kdhmo"), "teqmcrlgib", 6, 9, S::npos);
+    test(S("jblqp"), "njolbmspac", 6, 10, S::npos);
+    test(S("qmjgl"), "pofnhidklamecrbqjgst", 6, 0, S::npos);
+    test(S("rothp"), "jbhckmtgrqnosafedpli", 6, 1, S::npos);
+    test(S("ghknq"), "dobntpmqklicsahgjerf", 6, 10, S::npos);
+    test(S("eopfi"), "tpdshainjkbfoemlrgcq", 6, 19, S::npos);
+    test(S("dsnmg"), "oldpfgeakrnitscbjmqh", 6, 20, S::npos);
+    test(S("jnkrfhotgl"), "", 0, 0, S::npos);
+    test(S("dltjfngbko"), "rqegt", 0, 0, S::npos);
+    test(S("bmjlpkiqde"), "dashm", 0, 1, 8);
+    test(S("skrflobnqm"), "jqirk", 0, 2, 8);
+    test(S("jkpldtshrm"), "rckeg", 0, 4, 1);
+    test(S("ghasdbnjqo"), "jscie", 0, 5, 3);
+    test(S("igrkhpbqjt"), "efsphndliq", 0, 0, S::npos);
+    test(S("ikthdgcamf"), "gdicosleja", 0, 1, 5);
+    test(S("pcofgeniam"), "qcpjibosfl", 0, 5, 0);
+    test(S("rlfjgesqhc"), "lrhmefnjcq", 0, 9, 0);
+    test(S("itphbqsker"), "dtablcrseo", 0, 10, 1);
+    test(S("skjafcirqm"), "apckjsftedbhgomrnilq", 0, 0, S::npos);
+    test(S("tcqomarsfd"), "pcbrgflehjtiadnsokqm", 0, 1, S::npos);
+    test(S("rocfeldqpk"), "nsiadegjklhobrmtqcpf", 0, 10, 4);
+    test(S("cfpegndlkt"), "cpmajdqnolikhgsbretf", 0, 19, 0);
+    test(S("fqbtnkeasj"), "jcflkntmgiqrphdosaeb", 0, 20, 0);
+    test(S("shbcqnmoar"), "", 1, 0, S::npos);
+    test(S("bdoshlmfin"), "ontrs", 1, 0, S::npos);
+    test(S("khfrebnsgq"), "pfkna", 1, 1, S::npos);
+    test(S("getcrsaoji"), "ekosa", 1, 2, 1);
+    test(S("fjiknedcpq"), "anqhk", 1, 4, 4);
+    test(S("tkejgnafrm"), "jekca", 1, 5, 1);
+    test(S("jnakolqrde"), "ikemsjgacf", 1, 0, S::npos);
+    test(S("lcjptsmgbe"), "arolgsjkhm", 1, 1, S::npos);
+    test(S("itfsmcjorl"), "oftkbldhre", 1, 5, 1);
+    test(S("omchkfrjea"), "gbkqdoeftl", 1, 9, 4);
+    test(S("cigfqkated"), "sqcflrgtim", 1, 10, 1);
+    test(S("tscenjikml"), "fmhbkislrjdpanogqcet", 1, 0, S::npos);
+    test(S("qcpaemsinf"), "rnioadktqlgpbcjsmhef", 1, 1, S::npos);
+    test(S("gltkojeipd"), "oakgtnldpsefihqmjcbr", 1, 10, 1);
+    test(S("qistfrgnmp"), "gbnaelosidmcjqktfhpr", 1, 19, 1);
+    test(S("bdnpfcqaem"), "akbripjhlosndcmqgfet", 1, 20, 1);
+    test(S("ectnhskflp"), "", 5, 0, S::npos);
+    test(S("fgtianblpq"), "pijag", 5, 0, S::npos);
+    test(S("mfeqklirnh"), "jrckd", 5, 1, S::npos);
+    test(S("astedncjhk"), "qcloh", 5, 2, 6);
+    test(S("fhlqgcajbr"), "thlmp", 5, 4, S::npos);
+    test(S("epfhocmdng"), "qidmo", 5, 5, 6);
+    test(S("apcnsibger"), "lnegpsjqrd", 5, 0, S::npos);
+    test(S("aqkocrbign"), "rjqdablmfs", 5, 1, 5);
+    test(S("ijsmdtqgce"), "enkgpbsjaq", 5, 5, 7);
+    test(S("clobgsrken"), "kdsgoaijfh", 5, 9, 5);
+    test(S("jbhcfposld"), "trfqgmckbe", 5, 10, S::npos);
+    test(S("oqnpblhide"), "igetsracjfkdnpoblhqm", 5, 0, S::npos);
+    test(S("lroeasctif"), "nqctfaogirshlekbdjpm", 5, 1, S::npos);
+    test(S("bpjlgmiedh"), "csehfgomljdqinbartkp", 5, 10, 5);
+    test(S("pamkeoidrj"), "qahoegcmplkfsjbdnitr", 5, 19, 5);
+    test(S("espogqbthk"), "dpteiajrqmsognhlfbkc", 5, 20, 5);
+    test(S("shoiedtcjb"), "", 9, 0, S::npos);
+    test(S("ebcinjgads"), "tqbnh", 9, 0, S::npos);
+    test(S("dqmregkcfl"), "akmle", 9, 1, S::npos);
+    test(S("ngcrieqajf"), "iqfkm", 9, 2, S::npos);
+    test(S("qosmilgnjb"), "tqjsr", 9, 4, S::npos);
+    test(S("ikabsjtdfl"), "jplqg", 9, 5, 9);
+    test(S("ersmicafdh"), "oilnrbcgtj", 9, 0, S::npos);
+    test(S("fdnplotmgh"), "morkglpesn", 9, 1, S::npos);
+    test(S("fdbicojerm"), "dmicerngat", 9, 5, 9);
+    test(S("mbtafndjcq"), "radgeskbtc", 9, 9, S::npos);
+    test(S("mlenkpfdtc"), "ljikprsmqo", 9, 10, S::npos);
+    test(S("ahlcifdqgs"), "trqihkcgsjamfdbolnpe", 9, 0, S::npos);
+    test(S("bgjemaltks"), "lqmthbsrekajgnofcipd", 9, 1, S::npos);
+    test(S("pdhslbqrfc"), "jtalmedribkgqsopcnfh", 9, 10, S::npos);
+    test(S("dirhtsnjkc"), "spqfoiclmtagejbndkrh", 9, 19, 9);
+    test(S("dlroktbcja"), "nmotklspigjrdhcfaebq", 9, 20, 9);
+    test(S("ncjpmaekbs"), "", 10, 0, S::npos);
+    test(S("hlbosgmrak"), "hpmsd", 10, 0, S::npos);
+    test(S("pqfhsgilen"), "qnpor", 10, 1, S::npos);
+    test(S("gqtjsbdckh"), "otdma", 10, 2, S::npos);
+    test(S("cfkqpjlegi"), "efhjg", 10, 4, S::npos);
+    test(S("beanrfodgj"), "odpte", 10, 5, S::npos);
+    test(S("adtkqpbjfi"), "bctdgfmolr", 10, 0, S::npos);
+    test(S("iomkfthagj"), "oaklidrbqg", 10, 1, S::npos);
+}
+
+template <class S>
+void test2()
+{
+    test(S("sdpcilonqj"), "dnjfsagktr", 10, 5, S::npos);
+    test(S("gtfbdkqeml"), "nejaktmiqg", 10, 9, S::npos);
+    test(S("bmeqgcdorj"), "pjqonlebsf", 10, 10, S::npos);
+    test(S("etqlcanmob"), "dshmnbtolcjepgaikfqr", 10, 0, S::npos);
+    test(S("roqmkbdtia"), "iogfhpabtjkqlrnemcds", 10, 1, S::npos);
+    test(S("kadsithljf"), "ngridfabjsecpqltkmoh", 10, 10, S::npos);
+    test(S("sgtkpbfdmh"), "athmknplcgofrqejsdib", 10, 19, S::npos);
+    test(S("qgmetnabkl"), "ldobhmqcafnjtkeisgrp", 10, 20, S::npos);
+    test(S("cqjohampgd"), "", 11, 0, S::npos);
+    test(S("hobitmpsan"), "aocjb", 11, 0, S::npos);
+    test(S("tjehkpsalm"), "jbrnk", 11, 1, S::npos);
+    test(S("ngfbojitcl"), "tqedg", 11, 2, S::npos);
+    test(S("rcfkdbhgjo"), "nqskp", 11, 4, S::npos);
+    test(S("qghptonrea"), "eaqkl", 11, 5, S::npos);
+    test(S("hnprfgqjdl"), "reaoicljqm", 11, 0, S::npos);
+    test(S("hlmgabenti"), "lsftgajqpm", 11, 1, S::npos);
+    test(S("ofcjanmrbs"), "rlpfogmits", 11, 5, S::npos);
+    test(S("jqedtkornm"), "shkncmiaqj", 11, 9, S::npos);
+    test(S("rfedlasjmg"), "fpnatrhqgs", 11, 10, S::npos);
+    test(S("talpqjsgkm"), "sjclemqhnpdbgikarfot", 11, 0, S::npos);
+    test(S("lrkcbtqpie"), "otcmedjikgsfnqbrhpla", 11, 1, S::npos);
+    test(S("cipogdskjf"), "bonsaefdqiprkhlgtjcm", 11, 10, S::npos);
+    test(S("nqedcojahi"), "egpscmahijlfnkrodqtb", 11, 19, S::npos);
+    test(S("hefnrkmctj"), "kmqbfepjthgilscrndoa", 11, 20, S::npos);
+    test(S("atqirnmekfjolhpdsgcb"), "", 0, 0, S::npos);
+    test(S("echfkmlpribjnqsaogtd"), "prboq", 0, 0, S::npos);
+    test(S("qnhiftdgcleajbpkrosm"), "fjcqh", 0, 1, 4);
+    test(S("chamfknorbedjitgslpq"), "fmosa", 0, 2, 3);
+    test(S("njhqpibfmtlkaecdrgso"), "qdbok", 0, 4, 3);
+    test(S("ebnghfsqkprmdcljoiat"), "amslg", 0, 5, 3);
+    test(S("letjomsgihfrpqbkancd"), "smpltjneqb", 0, 0, S::npos);
+    test(S("nblgoipcrqeaktshjdmf"), "flitskrnge", 0, 1, 19);
+    test(S("cehkbngtjoiflqapsmrd"), "pgqihmlbef", 0, 5, 2);
+    test(S("mignapfoklbhcqjetdrs"), "cfpdqjtgsb", 0, 9, 2);
+    test(S("ceatbhlsqjgpnokfrmdi"), "htpsiaflom", 0, 10, 2);
+    test(S("ocihkjgrdelpfnmastqb"), "kpjfiaceghsrdtlbnomq", 0, 0, S::npos);
+    test(S("noelgschdtbrjfmiqkap"), "qhtbomidljgafneksprc", 0, 1, 16);
+    test(S("dkclqfombepritjnghas"), "nhtjobkcefldimpsaqgr", 0, 10, 1);
+    test(S("miklnresdgbhqcojftap"), "prabcjfqnoeskilmtgdh", 0, 19, 0);
+    test(S("htbcigojaqmdkfrnlsep"), "dtrgmchilkasqoebfpjn", 0, 20, 0);
+    test(S("febhmqtjanokscdirpgl"), "", 1, 0, S::npos);
+    test(S("loakbsqjpcrdhftniegm"), "sqome", 1, 0, S::npos);
+    test(S("reagphsqflbitdcjmkno"), "smfte", 1, 1, 6);
+    test(S("jitlfrqemsdhkopncabg"), "ciboh", 1, 2, 1);
+    test(S("mhtaepscdnrjqgbkifol"), "haois", 1, 4, 1);
+    test(S("tocesrfmnglpbjihqadk"), "abfki", 1, 5, 6);
+    test(S("lpfmctjrhdagneskbqoi"), "frdkocntmq", 1, 0, S::npos);
+    test(S("lsmqaepkdhncirbtjfgo"), "oasbpedlnr", 1, 1, 19);
+    test(S("epoiqmtldrabnkjhcfsg"), "kltqmhgand", 1, 5, 4);
+    test(S("emgasrilpknqojhtbdcf"), "gdtfjchpmr", 1, 9, 1);
+    test(S("hnfiagdpcklrjetqbsom"), "ponmcqblet", 1, 10, 1);
+    test(S("nsdfebgajhmtricpoklq"), "sgphqdnofeiklatbcmjr", 1, 0, S::npos);
+    test(S("atjgfsdlpobmeiqhncrk"), "ljqprsmigtfoneadckbh", 1, 1, 7);
+    test(S("sitodfgnrejlahcbmqkp"), "ligeojhafnkmrcsqtbdp", 1, 10, 1);
+    test(S("fraghmbiceknltjpqosd"), "lsimqfnjarbopedkhcgt", 1, 19, 1);
+    test(S("pmafenlhqtdbkirjsogc"), "abedmfjlghniorcqptks", 1, 20, 1);
+    test(S("pihgmoeqtnakrjslcbfd"), "", 10, 0, S::npos);
+    test(S("gjdkeprctqblnhiafsom"), "hqtoa", 10, 0, S::npos);
+    test(S("mkpnblfdsahrcqijteog"), "cahif", 10, 1, 12);
+    test(S("gckarqnelodfjhmbptis"), "kehis", 10, 2, S::npos);
+    test(S("gqpskidtbclomahnrjfe"), "kdlmh", 10, 4, 10);
+    test(S("pkldjsqrfgitbhmaecno"), "paeql", 10, 5, 15);
+    test(S("aftsijrbeklnmcdqhgop"), "aghoqiefnb", 10, 0, S::npos);
+    test(S("mtlgdrhafjkbiepqnsoc"), "jrbqaikpdo", 10, 1, S::npos);
+    test(S("pqgirnaefthokdmbsclj"), "smjonaeqcl", 10, 5, 11);
+    test(S("kpdbgjmtherlsfcqoina"), "eqbdrkcfah", 10, 9, 10);
+    test(S("jrlbothiknqmdgcfasep"), "kapmsienhf", 10, 10, 11);
+    test(S("mjogldqferckabinptsh"), "jpqotrlenfcsbhkaimdg", 10, 0, S::npos);
+    test(S("apoklnefbhmgqcdrisjt"), "jlbmhnfgtcqprikeados", 10, 1, 18);
+    test(S("ifeopcnrjbhkdgatmqls"), "stgbhfmdaljnpqoicker", 10, 10, 10);
+    test(S("ckqhaiesmjdnrgolbtpf"), "oihcetflbjagdsrkmqpn", 10, 19, 10);
+    test(S("bnlgapfimcoterskqdjh"), "adtclebmnpjsrqfkigoh", 10, 20, 10);
+    test(S("kgdlrobpmjcthqsafeni"), "", 19, 0, S::npos);
+    test(S("dfkechomjapgnslbtqir"), "beafg", 19, 0, S::npos);
+    test(S("rloadknfbqtgmhcsipje"), "iclat", 19, 1, S::npos);
+    test(S("mgjhkolrnadqbpetcifs"), "rkhnf", 19, 2, S::npos);
+    test(S("cmlfakiojdrgtbsphqen"), "clshq", 19, 4, S::npos);
+    test(S("kghbfipeomsntdalrqjc"), "dtcoj", 19, 5, 19);
+    test(S("eldiqckrnmtasbghjfpo"), "rqosnjmfth", 19, 0, S::npos);
+    test(S("abqjcfedgotihlnspkrm"), "siatdfqglh", 19, 1, S::npos);
+    test(S("qfbadrtjsimkolcenhpg"), "mrlshtpgjq", 19, 5, S::npos);
+    test(S("abseghclkjqifmtodrnp"), "adlcskgqjt", 19, 9, S::npos);
+    test(S("ibmsnlrjefhtdokacqpg"), "drshcjknaf", 19, 10, S::npos);
+    test(S("mrkfciqjebaponsthldg"), "etsaqroinghpkjdlfcbm", 19, 0, S::npos);
+    test(S("mjkticdeoqshpalrfbgn"), "sgepdnkqliambtrocfhj", 19, 1, S::npos);
+    test(S("rqnoclbdejgiphtfsakm"), "nlmcjaqgbsortfdihkpe", 19, 10, 19);
+    test(S("plkqbhmtfaeodjcrsing"), "racfnpmosldibqkghjet", 19, 19, 19);
+    test(S("oegalhmstjrfickpbndq"), "fjhdsctkqeiolagrnmbp", 19, 20, 19);
+    test(S("rdtgjcaohpblniekmsfq"), "", 20, 0, S::npos);
+    test(S("ofkqbnjetrmsaidphglc"), "ejanp", 20, 0, S::npos);
+    test(S("grkpahljcftesdmonqib"), "odife", 20, 1, S::npos);
+    test(S("jimlgbhfqkteospardcn"), "okaqd", 20, 2, S::npos);
+    test(S("gftenihpmslrjkqadcob"), "lcdbi", 20, 4, S::npos);
+    test(S("bmhldogtckrfsanijepq"), "fsqbj", 20, 5, S::npos);
+    test(S("nfqkrpjdesabgtlcmoih"), "bigdomnplq", 20, 0, S::npos);
+    test(S("focalnrpiqmdkstehbjg"), "apiblotgcd", 20, 1, S::npos);
+    test(S("rhqdspkmebiflcotnjga"), "acfhdenops", 20, 5, S::npos);
+    test(S("rahdtmsckfboqlpniegj"), "jopdeamcrk", 20, 9, S::npos);
+    test(S("fbkeiopclstmdqranjhg"), "trqncbkgmh", 20, 10, S::npos);
+    test(S("lifhpdgmbconstjeqark"), "tomglrkencbsfjqpihda", 20, 0, S::npos);
+}
+
+template <class S>
+void test3()
+{
+    test(S("pboqganrhedjmltsicfk"), "gbkhdnpoietfcmrslajq", 20, 1, S::npos);
+    test(S("klchabsimetjnqgorfpd"), "rtfnmbsglkjaichoqedp", 20, 10, S::npos);
+    test(S("sirfgmjqhctndbklaepo"), "ohkmdpfqbsacrtjnlgei", 20, 19, S::npos);
+    test(S("rlbdsiceaonqjtfpghkm"), "dlbrteoisgphmkncajfq", 20, 20, S::npos);
+    test(S("ecgdanriptblhjfqskom"), "", 21, 0, S::npos);
+    test(S("fdmiarlpgcskbhoteqjn"), "sjrlo", 21, 0, S::npos);
+    test(S("rlbstjqopignecmfadkh"), "qjpor", 21, 1, S::npos);
+    test(S("grjpqmbshektdolcafni"), "odhfn", 21, 2, S::npos);
+    test(S("sakfcohtqnibprjmlged"), "qtfin", 21, 4, S::npos);
+    test(S("mjtdglasihqpocebrfkn"), "hpqfo", 21, 5, S::npos);
+    test(S("okaplfrntghqbmeicsdj"), "fabmertkos", 21, 0, S::npos);
+    test(S("sahngemrtcjidqbklfpo"), "brqtgkmaej", 21, 1, S::npos);
+    test(S("dlmsipcnekhbgoaftqjr"), "nfrdeihsgl", 21, 5, S::npos);
+    test(S("ahegrmqnoiklpfsdbcjt"), "hlfrosekpi", 21, 9, S::npos);
+    test(S("hdsjbnmlegtkqripacof"), "atgbkrjdsm", 21, 10, S::npos);
+    test(S("pcnedrfjihqbalkgtoms"), "blnrptjgqmaifsdkhoec", 21, 0, S::npos);
+    test(S("qjidealmtpskrbfhocng"), "ctpmdahebfqjgknloris", 21, 1, S::npos);
+    test(S("qeindtagmokpfhsclrbj"), "apnkeqthrmlbfodiscgj", 21, 10, S::npos);
+    test(S("kpfegbjhsrnodltqciam"), "jdgictpframeoqlsbknh", 21, 19, S::npos);
+    test(S("hnbrcplsjfgiktoedmaq"), "qprlsfojamgndekthibc", 21, 20, S::npos);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test0<S>();
+    test1<S>();
+    test2<S>();
+    test3<S>();
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.find_first_of( "",      0, 0) == SV::npos, "" );
+    static_assert (sv1.find_first_of( "irkhs", 0, 5) == SV::npos, "" );
+    static_assert (sv2.find_first_of( "",      0, 0) == SV::npos, "" );
+    static_assert (sv2.find_first_of( "gfsrt", 0, 5) == SV::npos, "" );
+    static_assert (sv2.find_first_of( "lecar", 0, 5) == 0, "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.find/find_first_of_string_view_size.pass.cpp

@@ -0,0 +1,148 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// size_type find_first_of(const basic_string_view& str, size_type pos = 0) const;
+
+#include <string_view>
+#include <cassert>
+
+template <class S>
+void
+test(const S& s, const S& str, typename S::size_type pos, typename S::size_type x)
+{
+    assert(s.find_first_of(str, pos) == x);
+    if (x != S::npos)
+        assert(pos <= x && x < s.size());
+}
+
+template <class S>
+void
+test(const S& s, const S& str, typename S::size_type x)
+{
+    assert(s.find_first_of(str) == x);
+    if (x != S::npos)
+        assert(x < s.size());
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), S(""), 0, S::npos);
+    test(S(""), S("laenf"), 0, S::npos);
+    test(S(""), S("pqlnkmbdjo"), 0, S::npos);
+    test(S(""), S("qkamfogpnljdcshbreti"), 0, S::npos);
+    test(S(""), S(""), 1, S::npos);
+    test(S(""), S("bjaht"), 1, S::npos);
+    test(S(""), S("hjlcmgpket"), 1, S::npos);
+    test(S(""), S("htaobedqikfplcgjsmrn"), 1, S::npos);
+    test(S("fodgq"), S(""), 0, S::npos);
+    test(S("qanej"), S("dfkap"), 0, 1);
+    test(S("clbao"), S("ihqrfebgad"), 0, 2);
+    test(S("mekdn"), S("ngtjfcalbseiqrphmkdo"), 0, 0);
+    test(S("srdfq"), S(""), 1, S::npos);
+    test(S("oemth"), S("ikcrq"), 1, S::npos);
+    test(S("cdaih"), S("dmajblfhsg"), 1, 1);
+    test(S("qohtk"), S("oqftjhdmkgsblacenirp"), 1, 1);
+    test(S("cshmd"), S(""), 2, S::npos);
+    test(S("lhcdo"), S("oebqi"), 2, 4);
+    test(S("qnsoh"), S("kojhpmbsfe"), 2, 2);
+    test(S("pkrof"), S("acbsjqogpltdkhinfrem"), 2, 2);
+    test(S("fmtsp"), S(""), 4, S::npos);
+    test(S("khbpm"), S("aobjd"), 4, S::npos);
+    test(S("pbsji"), S("pcbahntsje"), 4, S::npos);
+    test(S("mprdj"), S("fhepcrntkoagbmldqijs"), 4, 4);
+    test(S("eqmpa"), S(""), 5, S::npos);
+    test(S("omigs"), S("kocgb"), 5, S::npos);
+    test(S("onmje"), S("fbslrjiqkm"), 5, S::npos);
+    test(S("oqmrj"), S("jeidpcmalhfnqbgtrsko"), 5, S::npos);
+    test(S("schfa"), S(""), 6, S::npos);
+    test(S("igdsc"), S("qngpd"), 6, S::npos);
+    test(S("brqgo"), S("rodhqklgmb"), 6, S::npos);
+    test(S("tnrph"), S("thdjgafrlbkoiqcspmne"), 6, S::npos);
+    test(S("hcjitbfapl"), S(""), 0, S::npos);
+    test(S("daiprenocl"), S("ashjd"), 0, 0);
+    test(S("litpcfdghe"), S("mgojkldsqh"), 0, 0);
+    test(S("aidjksrolc"), S("imqnaghkfrdtlopbjesc"), 0, 0);
+    test(S("qpghtfbaji"), S(""), 1, S::npos);
+    test(S("gfshlcmdjr"), S("nadkh"), 1, 3);
+    test(S("nkodajteqp"), S("ofdrqmkebl"), 1, 1);
+    test(S("gbmetiprqd"), S("bdfjqgatlksriohemnpc"), 1, 1);
+    test(S("crnklpmegd"), S(""), 5, S::npos);
+    test(S("jsbtafedoc"), S("prqgn"), 5, S::npos);
+    test(S("qnmodrtkeb"), S("pejafmnokr"), 5, 5);
+    test(S("cpebqsfmnj"), S("odnqkgijrhabfmcestlp"), 5, 5);
+    test(S("lmofqdhpki"), S(""), 9, S::npos);
+    test(S("hnefkqimca"), S("rtjpa"), 9, 9);
+    test(S("drtasbgmfp"), S("ktsrmnqagd"), 9, S::npos);
+    test(S("lsaijeqhtr"), S("rtdhgcisbnmoaqkfpjle"), 9, 9);
+    test(S("elgofjmbrq"), S(""), 10, S::npos);
+    test(S("mjqdgalkpc"), S("dplqa"), 10, S::npos);
+    test(S("kthqnfcerm"), S("dkacjoptns"), 10, S::npos);
+    test(S("dfsjhanorc"), S("hqfimtrgnbekpdcsjalo"), 10, S::npos);
+    test(S("eqsgalomhb"), S(""), 11, S::npos);
+    test(S("akiteljmoh"), S("lofbc"), 11, S::npos);
+    test(S("hlbdfreqjo"), S("astoegbfpn"), 11, S::npos);
+    test(S("taqobhlerg"), S("pdgreqomsncafklhtibj"), 11, S::npos);
+    test(S("snafbdlghrjkpqtoceim"), S(""), 0, S::npos);
+    test(S("aemtbrgcklhndjisfpoq"), S("lbtqd"), 0, 3);
+    test(S("pnracgfkjdiholtbqsem"), S("tboimldpjh"), 0, 0);
+    test(S("dicfltehbsgrmojnpkaq"), S("slcerthdaiqjfnobgkpm"), 0, 0);
+    test(S("jlnkraeodhcspfgbqitm"), S(""), 1, S::npos);
+    test(S("lhosrngtmfjikbqpcade"), S("aqibs"), 1, 3);
+    test(S("rbtaqjhgkneisldpmfoc"), S("gtfblmqinc"), 1, 1);
+    test(S("gpifsqlrdkbonjtmheca"), S("mkqpbtdalgniorhfescj"), 1, 1);
+    test(S("hdpkobnsalmcfijregtq"), S(""), 10, S::npos);
+    test(S("jtlshdgqaiprkbcoenfm"), S("pblas"), 10, 10);
+    test(S("fkdrbqltsgmcoiphneaj"), S("arosdhcfme"), 10, 10);
+    test(S("crsplifgtqedjohnabmk"), S("blkhjeogicatqfnpdmsr"), 10, 10);
+    test(S("niptglfbosehkamrdqcj"), S(""), 19, S::npos);
+    test(S("copqdhstbingamjfkler"), S("djkqc"), 19, S::npos);
+    test(S("mrtaefilpdsgocnhqbjk"), S("lgokshjtpb"), 19, 19);
+    test(S("kojatdhlcmigpbfrqnes"), S("bqjhtkfepimcnsgrlado"), 19, 19);
+    test(S("eaintpchlqsbdgrkjofm"), S(""), 20, S::npos);
+    test(S("gjnhidfsepkrtaqbmclo"), S("nocfa"), 20, S::npos);
+    test(S("spocfaktqdbiejlhngmr"), S("bgtajmiedc"), 20, S::npos);
+    test(S("rphmlekgfscndtaobiqj"), S("lsckfnqgdahejiopbtmr"), 20, S::npos);
+    test(S("liatsqdoegkmfcnbhrpj"), S(""), 21, S::npos);
+    test(S("binjagtfldkrspcomqeh"), S("gfsrt"), 21, S::npos);
+    test(S("latkmisecnorjbfhqpdg"), S("pfsocbhjtm"), 21, S::npos);
+    test(S("lecfratdjkhnsmqpoigb"), S("tpflmdnoicjgkberhqsa"), 21, S::npos);
+}
+
+template <class S>
+void test1()
+{
+    test(S(""), S(""), S::npos);
+    test(S(""), S("laenf"), S::npos);
+    test(S(""), S("pqlnkmbdjo"), S::npos);
+    test(S(""), S("qkamfogpnljdcshbreti"), S::npos);
+    test(S("nhmko"), S(""), S::npos);
+    test(S("lahfb"), S("irkhs"), 2);
+    test(S("gmfhd"), S("kantesmpgj"), 0);
+    test(S("odaft"), S("oknlrstdpiqmjbaghcfe"), 0);
+    test(S("eolhfgpjqk"), S(""), S::npos);
+    test(S("nbatdlmekr"), S("bnrpe"), 0);
+    test(S("jdmciepkaq"), S("jtdaefblso"), 0);
+    test(S("hkbgspoflt"), S("oselktgbcapndfjihrmq"), 0);
+    test(S("gprdcokbnjhlsfmtieqa"), S(""), S::npos);
+    test(S("qjghlnftcaismkropdeb"), S("bjaht"), 1);
+    test(S("pnalfrdtkqcmojiesbhg"), S("hjlcmgpket"), 0);
+    test(S("pniotcfrhqsmgdkjbael"), S("htaobedqikfplcgjsmrn"), 0);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test0<S>();
+    test1<S>();
+    }
+}

test/std/strings/string.view/string.view.find/find_last_not_of_char_size.pass.cpp

@@ -0,0 +1,82 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// const size_type find_last_not_of(charT c, size_type pos = npos) const;
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, typename S::value_type c, typename S::size_type pos,
+     typename S::size_type x)
+{
+    assert(s.find_last_not_of(c, pos) == x);
+    if (x != S::npos)
+        assert(x <= pos && x < s.size());
+}
+
+template <class S>
+void
+test(const S& s, typename S::value_type c, typename S::size_type x)
+{
+    assert(s.find_last_not_of(c) == x);
+    if (x != S::npos)
+        assert(x < s.size());
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test(S(""), 'i', 0, S::npos);
+    test(S(""), 'i', 1, S::npos);
+    test(S("kitcj"), 'i', 0, 0);
+    test(S("qkamf"), 'i', 1, 1);
+    test(S("nhmko"), 'i', 2, 2);
+    test(S("tpsaf"), 'i', 4, 4);
+    test(S("lahfb"), 'i', 5, 4);
+    test(S("irkhs"), 'i', 6, 4);
+    test(S("gmfhdaipsr"), 'i', 0, 0);
+    test(S("kantesmpgj"), 'i', 1, 1);
+    test(S("odaftiegpm"), 'i', 5, 4);
+    test(S("oknlrstdpi"), 'i', 9, 8);
+    test(S("eolhfgpjqk"), 'i', 10, 9);
+    test(S("pcdrofikas"), 'i', 11, 9);
+    test(S("nbatdlmekrgcfqsophij"), 'i', 0, 0);
+    test(S("bnrpehidofmqtcksjgla"), 'i', 1, 1);
+    test(S("jdmciepkaqgotsrfnhlb"), 'i', 10, 10);
+    test(S("jtdaefblsokrmhpgcnqi"), 'i', 19, 18);
+    test(S("hkbgspofltajcnedqmri"), 'i', 20, 18);
+    test(S("oselktgbcapndfjihrmq"), 'i', 21, 19);
+
+    test(S(""), 'i', S::npos);
+    test(S("csope"), 'i', 4);
+    test(S("gfsmthlkon"), 'i', 9);
+    test(S("laenfsbridchgotmkqpj"), 'i', 19);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.find_last_not_of( 'i', 0 ) == SV::npos, "" );
+    static_assert (sv1.find_last_not_of( 'i', 1 ) == SV::npos, "" );
+    static_assert (sv2.find_last_not_of( 'a', 0 ) == SV::npos, "" );
+    static_assert (sv2.find_last_not_of( 'a', 1 ) == 1, "" );
+    static_assert (sv2.find_last_not_of( 'e', 5 ) == 3, "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.find/find_last_not_of_pointer_size.pass.cpp

@@ -0,0 +1,165 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr size_type find_last_not_of(const charT* s, size_type pos = npos) const;
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type pos,
+     typename S::size_type x)
+{
+    assert(s.find_last_not_of(str, pos) == x);
+    if (x != S::npos)
+        assert(x <= pos && x < s.size());
+}
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type x)
+{
+    assert(s.find_last_not_of(str) == x);
+    if (x != S::npos)
+        assert(x < s.size());
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), "", 0, S::npos);
+    test(S(""), "laenf", 0, S::npos);
+    test(S(""), "pqlnkmbdjo", 0, S::npos);
+    test(S(""), "qkamfogpnljdcshbreti", 0, S::npos);
+    test(S(""), "", 1, S::npos);
+    test(S(""), "bjaht", 1, S::npos);
+    test(S(""), "hjlcmgpket", 1, S::npos);
+    test(S(""), "htaobedqikfplcgjsmrn", 1, S::npos);
+    test(S("fodgq"), "", 0, 0);
+    test(S("qanej"), "dfkap", 0, 0);
+    test(S("clbao"), "ihqrfebgad", 0, 0);
+    test(S("mekdn"), "ngtjfcalbseiqrphmkdo", 0, S::npos);
+    test(S("srdfq"), "", 1, 1);
+    test(S("oemth"), "ikcrq", 1, 1);
+    test(S("cdaih"), "dmajblfhsg", 1, 0);
+    test(S("qohtk"), "oqftjhdmkgsblacenirp", 1, S::npos);
+    test(S("cshmd"), "", 2, 2);
+    test(S("lhcdo"), "oebqi", 2, 2);
+    test(S("qnsoh"), "kojhpmbsfe", 2, 1);
+    test(S("pkrof"), "acbsjqogpltdkhinfrem", 2, S::npos);
+    test(S("fmtsp"), "", 4, 4);
+    test(S("khbpm"), "aobjd", 4, 4);
+    test(S("pbsji"), "pcbahntsje", 4, 4);
+    test(S("mprdj"), "fhepcrntkoagbmldqijs", 4, S::npos);
+    test(S("eqmpa"), "", 5, 4);
+    test(S("omigs"), "kocgb", 5, 4);
+    test(S("onmje"), "fbslrjiqkm", 5, 4);
+    test(S("oqmrj"), "jeidpcmalhfnqbgtrsko", 5, S::npos);
+    test(S("schfa"), "", 6, 4);
+    test(S("igdsc"), "qngpd", 6, 4);
+    test(S("brqgo"), "rodhqklgmb", 6, S::npos);
+    test(S("tnrph"), "thdjgafrlbkoiqcspmne", 6, S::npos);
+    test(S("hcjitbfapl"), "", 0, 0);
+    test(S("daiprenocl"), "ashjd", 0, S::npos);
+    test(S("litpcfdghe"), "mgojkldsqh", 0, S::npos);
+    test(S("aidjksrolc"), "imqnaghkfrdtlopbjesc", 0, S::npos);
+    test(S("qpghtfbaji"), "", 1, 1);
+    test(S("gfshlcmdjr"), "nadkh", 1, 1);
+    test(S("nkodajteqp"), "ofdrqmkebl", 1, 0);
+    test(S("gbmetiprqd"), "bdfjqgatlksriohemnpc", 1, S::npos);
+    test(S("crnklpmegd"), "", 5, 5);
+    test(S("jsbtafedoc"), "prqgn", 5, 5);
+    test(S("qnmodrtkeb"), "pejafmnokr", 5, 4);
+    test(S("cpebqsfmnj"), "odnqkgijrhabfmcestlp", 5, S::npos);
+    test(S("lmofqdhpki"), "", 9, 9);
+    test(S("hnefkqimca"), "rtjpa", 9, 8);
+    test(S("drtasbgmfp"), "ktsrmnqagd", 9, 9);
+    test(S("lsaijeqhtr"), "rtdhgcisbnmoaqkfpjle", 9, S::npos);
+    test(S("elgofjmbrq"), "", 10, 9);
+    test(S("mjqdgalkpc"), "dplqa", 10, 9);
+    test(S("kthqnfcerm"), "dkacjoptns", 10, 9);
+    test(S("dfsjhanorc"), "hqfimtrgnbekpdcsjalo", 10, S::npos);
+    test(S("eqsgalomhb"), "", 11, 9);
+    test(S("akiteljmoh"), "lofbc", 11, 9);
+    test(S("hlbdfreqjo"), "astoegbfpn", 11, 8);
+    test(S("taqobhlerg"), "pdgreqomsncafklhtibj", 11, S::npos);
+    test(S("snafbdlghrjkpqtoceim"), "", 0, 0);
+    test(S("aemtbrgcklhndjisfpoq"), "lbtqd", 0, 0);
+    test(S("pnracgfkjdiholtbqsem"), "tboimldpjh", 0, S::npos);
+    test(S("dicfltehbsgrmojnpkaq"), "slcerthdaiqjfnobgkpm", 0, S::npos);
+    test(S("jlnkraeodhcspfgbqitm"), "", 1, 1);
+    test(S("lhosrngtmfjikbqpcade"), "aqibs", 1, 1);
+    test(S("rbtaqjhgkneisldpmfoc"), "gtfblmqinc", 1, 0);
+    test(S("gpifsqlrdkbonjtmheca"), "mkqpbtdalgniorhfescj", 1, S::npos);
+    test(S("hdpkobnsalmcfijregtq"), "", 10, 10);
+    test(S("jtlshdgqaiprkbcoenfm"), "pblas", 10, 9);
+    test(S("fkdrbqltsgmcoiphneaj"), "arosdhcfme", 10, 9);
+    test(S("crsplifgtqedjohnabmk"), "blkhjeogicatqfnpdmsr", 10, S::npos);
+    test(S("niptglfbosehkamrdqcj"), "", 19, 19);
+    test(S("copqdhstbingamjfkler"), "djkqc", 19, 19);
+    test(S("mrtaefilpdsgocnhqbjk"), "lgokshjtpb", 19, 16);
+    test(S("kojatdhlcmigpbfrqnes"), "bqjhtkfepimcnsgrlado", 19, S::npos);
+    test(S("eaintpchlqsbdgrkjofm"), "", 20, 19);
+    test(S("gjnhidfsepkrtaqbmclo"), "nocfa", 20, 18);
+    test(S("spocfaktqdbiejlhngmr"), "bgtajmiedc", 20, 19);
+    test(S("rphmlekgfscndtaobiqj"), "lsckfnqgdahejiopbtmr", 20, S::npos);
+    test(S("liatsqdoegkmfcnbhrpj"), "", 21, 19);
+    test(S("binjagtfldkrspcomqeh"), "gfsrt", 21, 19);
+    test(S("latkmisecnorjbfhqpdg"), "pfsocbhjtm", 21, 19);
+    test(S("lecfratdjkhnsmqpoigb"), "tpflmdnoicjgkberhqsa", 21, S::npos);
+}
+
+template <class S>
+void test1()
+{
+    test(S(""), "", S::npos);
+    test(S(""), "laenf", S::npos);
+    test(S(""), "pqlnkmbdjo", S::npos);
+    test(S(""), "qkamfogpnljdcshbreti", S::npos);
+    test(S("nhmko"), "", 4);
+    test(S("lahfb"), "irkhs", 4);
+    test(S("gmfhd"), "kantesmpgj", 4);
+    test(S("odaft"), "oknlrstdpiqmjbaghcfe", S::npos);
+    test(S("eolhfgpjqk"), "", 9);
+    test(S("nbatdlmekr"), "bnrpe", 8);
+    test(S("jdmciepkaq"), "jtdaefblso", 9);
+    test(S("hkbgspoflt"), "oselktgbcapndfjihrmq", S::npos);
+    test(S("gprdcokbnjhlsfmtieqa"), "", 19);
+    test(S("qjghlnftcaismkropdeb"), "bjaht", 18);
+    test(S("pnalfrdtkqcmojiesbhg"), "hjlcmgpket", 17);
+    test(S("pniotcfrhqsmgdkjbael"), "htaobedqikfplcgjsmrn", S::npos);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test0<S>();
+    test1<S>();
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.find_last_not_of( "",      0) == SV::npos, "" );
+    static_assert (sv1.find_last_not_of( "irkhs", 5) == SV::npos, "" );
+    static_assert (sv2.find_last_not_of( "",      0) == 0, "" );
+    static_assert (sv2.find_last_not_of( "gfsrt", 5) == 4, "" );
+    static_assert (sv2.find_last_not_of( "lecar", 5) == 3, "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.find/find_last_not_of_pointer_size_size.pass.cpp

@@ -0,0 +1,392 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// constexpr size_type find_last_not_of(const charT* s, size_type pos, size_type n) const;
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type pos,
+     typename S::size_type n, typename S::size_type x)
+{
+    assert(s.find_last_not_of(str, pos, n) == x);
+    if (x != S::npos)
+        assert(x <= pos && x < s.size());
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), "", 0, 0, S::npos);
+    test(S(""), "irkhs", 0, 0, S::npos);
+    test(S(""), "kante", 0, 1, S::npos);
+    test(S(""), "oknlr", 0, 2, S::npos);
+    test(S(""), "pcdro", 0, 4, S::npos);
+    test(S(""), "bnrpe", 0, 5, S::npos);
+    test(S(""), "jtdaefblso", 0, 0, S::npos);
+    test(S(""), "oselktgbca", 0, 1, S::npos);
+    test(S(""), "eqgaplhckj", 0, 5, S::npos);
+    test(S(""), "bjahtcmnlp", 0, 9, S::npos);
+    test(S(""), "hjlcmgpket", 0, 10, S::npos);
+    test(S(""), "htaobedqikfplcgjsmrn", 0, 0, S::npos);
+    test(S(""), "hpqiarojkcdlsgnmfetb", 0, 1, S::npos);
+    test(S(""), "dfkaprhjloqetcsimnbg", 0, 10, S::npos);
+    test(S(""), "ihqrfebgadntlpmjksoc", 0, 19, S::npos);
+    test(S(""), "ngtjfcalbseiqrphmkdo", 0, 20, S::npos);
+    test(S(""), "", 1, 0, S::npos);
+    test(S(""), "lbtqd", 1, 0, S::npos);
+    test(S(""), "tboim", 1, 1, S::npos);
+    test(S(""), "slcer", 1, 2, S::npos);
+    test(S(""), "cbjfs", 1, 4, S::npos);
+    test(S(""), "aqibs", 1, 5, S::npos);
+    test(S(""), "gtfblmqinc", 1, 0, S::npos);
+    test(S(""), "mkqpbtdalg", 1, 1, S::npos);
+    test(S(""), "kphatlimcd", 1, 5, S::npos);
+    test(S(""), "pblasqogic", 1, 9, S::npos);
+    test(S(""), "arosdhcfme", 1, 10, S::npos);
+    test(S(""), "blkhjeogicatqfnpdmsr", 1, 0, S::npos);
+    test(S(""), "bmhineprjcoadgstflqk", 1, 1, S::npos);
+    test(S(""), "djkqcmetslnghpbarfoi", 1, 10, S::npos);
+    test(S(""), "lgokshjtpbemarcdqnfi", 1, 19, S::npos);
+    test(S(""), "bqjhtkfepimcnsgrlado", 1, 20, S::npos);
+    test(S("eaint"), "", 0, 0, 0);
+    test(S("binja"), "gfsrt", 0, 0, 0);
+    test(S("latkm"), "pfsoc", 0, 1, 0);
+    test(S("lecfr"), "tpflm", 0, 2, 0);
+    test(S("eqkst"), "sgkec", 0, 4, S::npos);
+    test(S("cdafr"), "romds", 0, 5, 0);
+    test(S("prbhe"), "qhjistlgmr", 0, 0, 0);
+    test(S("lbisk"), "pedfirsglo", 0, 1, 0);
+    test(S("hrlpd"), "aqcoslgrmk", 0, 5, 0);
+    test(S("ehmja"), "dabckmepqj", 0, 9, S::npos);
+    test(S("mhqgd"), "pqscrjthli", 0, 10, 0);
+    test(S("tgklq"), "kfphdcsjqmobliagtren", 0, 0, 0);
+    test(S("bocjs"), "rokpefncljibsdhqtagm", 0, 1, 0);
+    test(S("grbsd"), "afionmkphlebtcjqsgrd", 0, 10, 0);
+    test(S("ofjqr"), "aenmqplidhkofrjbctsg", 0, 19, S::npos);
+    test(S("btlfi"), "osjmbtcadhiklegrpqnf", 0, 20, S::npos);
+    test(S("clrgb"), "", 1, 0, 1);
+    test(S("tjmek"), "osmia", 1, 0, 1);
+    test(S("bgstp"), "ckonl", 1, 1, 1);
+    test(S("hstrk"), "ilcaj", 1, 2, 1);
+    test(S("kmspj"), "lasiq", 1, 4, 1);
+    test(S("tjboh"), "kfqmr", 1, 5, 1);
+    test(S("ilbcj"), "klnitfaobg", 1, 0, 1);
+    test(S("jkngf"), "gjhmdlqikp", 1, 1, 1);
+    test(S("gfcql"), "skbgtahqej", 1, 5, 1);
+    test(S("dqtlg"), "bjsdgtlpkf", 1, 9, 1);
+    test(S("bthpg"), "bjgfmnlkio", 1, 10, 1);
+    test(S("dgsnq"), "lbhepotfsjdqigcnamkr", 1, 0, 1);
+    test(S("rmfhp"), "tebangckmpsrqdlfojhi", 1, 1, 1);
+    test(S("jfdam"), "joflqbdkhtegimscpanr", 1, 10, S::npos);
+    test(S("edapb"), "adpmcohetfbsrjinlqkg", 1, 19, S::npos);
+    test(S("brfsm"), "iacldqjpfnogbsrhmetk", 1, 20, S::npos);
+    test(S("ndrhl"), "", 2, 0, 2);
+    test(S("mrecp"), "otkgb", 2, 0, 2);
+    test(S("qlasf"), "cqsjl", 2, 1, 2);
+    test(S("smaqd"), "dpifl", 2, 2, 2);
+    test(S("hjeni"), "oapht", 2, 4, 2);
+    test(S("ocmfj"), "cifts", 2, 5, 2);
+    test(S("hmftq"), "nmsckbgalo", 2, 0, 2);
+    test(S("fklad"), "tpksqhamle", 2, 1, 2);
+    test(S("dirnm"), "tpdrchmkji", 2, 5, 1);
+    test(S("hrgdc"), "ijagfkblst", 2, 9, 1);
+    test(S("ifakg"), "kpocsignjb", 2, 10, 2);
+    test(S("ebrgd"), "pecqtkjsnbdrialgmohf", 2, 0, 2);
+    test(S("rcjml"), "aiortphfcmkjebgsndql", 2, 1, 2);
+    test(S("peqmt"), "sdbkeamglhipojqftrcn", 2, 10, 2);
+    test(S("frehn"), "ljqncehgmfktroapidbs", 2, 19, S::npos);
+    test(S("tqolf"), "rtcfodilamkbenjghqps", 2, 20, S::npos);
+    test(S("cjgao"), "", 4, 0, 4);
+    test(S("kjplq"), "mabns", 4, 0, 4);
+    test(S("herni"), "bdnrp", 4, 1, 4);
+    test(S("tadrb"), "scidp", 4, 2, 4);
+    test(S("pkfeo"), "agbjl", 4, 4, 4);
+    test(S("hoser"), "jfmpr", 4, 5, 3);
+    test(S("kgrsp"), "rbpefghsmj", 4, 0, 4);
+    test(S("pgejb"), "apsfntdoqc", 4, 1, 4);
+    test(S("thlnq"), "ndkjeisgcl", 4, 5, 4);
+    test(S("nbmit"), "rnfpqatdeo", 4, 9, 3);
+    test(S("jgmib"), "bntjlqrfik", 4, 10, 2);
+    test(S("ncrfj"), "kcrtmpolnaqejghsfdbi", 4, 0, 4);
+    test(S("ncsik"), "lobheanpkmqidsrtcfgj", 4, 1, 4);
+    test(S("sgbfh"), "athdkljcnreqbgpmisof", 4, 10, 3);
+    test(S("dktbn"), "qkdmjialrscpbhefgont", 4, 19, 2);
+    test(S("fthqm"), "dmasojntqleribkgfchp", 4, 20, S::npos);
+    test(S("klopi"), "", 5, 0, 4);
+    test(S("dajhn"), "psthd", 5, 0, 4);
+    test(S("jbgno"), "rpmjd", 5, 1, 4);
+    test(S("hkjae"), "dfsmk", 5, 2, 4);
+}
+
+template <class S>
+void test1()
+{
+    test(S("gbhqo"), "skqne", 5, 4, 4);
+    test(S("ktdor"), "kipnf", 5, 5, 4);
+    test(S("ldprn"), "hmrnqdgifl", 5, 0, 4);
+    test(S("egmjk"), "fsmjcdairn", 5, 1, 4);
+    test(S("armql"), "pcdgltbrfj", 5, 5, 3);
+    test(S("cdhjo"), "aekfctpirg", 5, 9, 4);
+    test(S("jcons"), "ledihrsgpf", 5, 10, 3);
+    test(S("cbrkp"), "mqcklahsbtirgopefndj", 5, 0, 4);
+    test(S("fhgna"), "kmlthaoqgecrnpdbjfis", 5, 1, 4);
+    test(S("ejfcd"), "sfhbamcdptojlkrenqgi", 5, 10, 1);
+    test(S("kqjhe"), "pbniofmcedrkhlstgaqj", 5, 19, 2);
+    test(S("pbdjl"), "mongjratcskbhqiepfdl", 5, 20, S::npos);
+    test(S("gajqn"), "", 6, 0, 4);
+    test(S("stedk"), "hrnat", 6, 0, 4);
+    test(S("tjkaf"), "gsqdt", 6, 1, 4);
+    test(S("dthpe"), "bspkd", 6, 2, 4);
+    test(S("klhde"), "ohcmb", 6, 4, 4);
+    test(S("bhlki"), "heatr", 6, 5, 4);
+    test(S("lqmoh"), "pmblckedfn", 6, 0, 4);
+    test(S("mtqin"), "aceqmsrbik", 6, 1, 4);
+    test(S("dpqbr"), "lmbtdehjrn", 6, 5, 4);
+    test(S("kdhmo"), "teqmcrlgib", 6, 9, 4);
+    test(S("jblqp"), "njolbmspac", 6, 10, 3);
+    test(S("qmjgl"), "pofnhidklamecrbqjgst", 6, 0, 4);
+    test(S("rothp"), "jbhckmtgrqnosafedpli", 6, 1, 4);
+    test(S("ghknq"), "dobntpmqklicsahgjerf", 6, 10, 1);
+    test(S("eopfi"), "tpdshainjkbfoemlrgcq", 6, 19, S::npos);
+    test(S("dsnmg"), "oldpfgeakrnitscbjmqh", 6, 20, S::npos);
+    test(S("jnkrfhotgl"), "", 0, 0, 0);
+    test(S("dltjfngbko"), "rqegt", 0, 0, 0);
+    test(S("bmjlpkiqde"), "dashm", 0, 1, 0);
+    test(S("skrflobnqm"), "jqirk", 0, 2, 0);
+    test(S("jkpldtshrm"), "rckeg", 0, 4, 0);
+    test(S("ghasdbnjqo"), "jscie", 0, 5, 0);
+    test(S("igrkhpbqjt"), "efsphndliq", 0, 0, 0);
+    test(S("ikthdgcamf"), "gdicosleja", 0, 1, 0);
+    test(S("pcofgeniam"), "qcpjibosfl", 0, 5, S::npos);
+    test(S("rlfjgesqhc"), "lrhmefnjcq", 0, 9, S::npos);
+    test(S("itphbqsker"), "dtablcrseo", 0, 10, 0);
+    test(S("skjafcirqm"), "apckjsftedbhgomrnilq", 0, 0, 0);
+    test(S("tcqomarsfd"), "pcbrgflehjtiadnsokqm", 0, 1, 0);
+    test(S("rocfeldqpk"), "nsiadegjklhobrmtqcpf", 0, 10, 0);
+    test(S("cfpegndlkt"), "cpmajdqnolikhgsbretf", 0, 19, S::npos);
+    test(S("fqbtnkeasj"), "jcflkntmgiqrphdosaeb", 0, 20, S::npos);
+    test(S("shbcqnmoar"), "", 1, 0, 1);
+    test(S("bdoshlmfin"), "ontrs", 1, 0, 1);
+    test(S("khfrebnsgq"), "pfkna", 1, 1, 1);
+    test(S("getcrsaoji"), "ekosa", 1, 2, 0);
+    test(S("fjiknedcpq"), "anqhk", 1, 4, 1);
+    test(S("tkejgnafrm"), "jekca", 1, 5, 0);
+    test(S("jnakolqrde"), "ikemsjgacf", 1, 0, 1);
+    test(S("lcjptsmgbe"), "arolgsjkhm", 1, 1, 1);
+    test(S("itfsmcjorl"), "oftkbldhre", 1, 5, 0);
+    test(S("omchkfrjea"), "gbkqdoeftl", 1, 9, 1);
+    test(S("cigfqkated"), "sqcflrgtim", 1, 10, S::npos);
+    test(S("tscenjikml"), "fmhbkislrjdpanogqcet", 1, 0, 1);
+    test(S("qcpaemsinf"), "rnioadktqlgpbcjsmhef", 1, 1, 1);
+    test(S("gltkojeipd"), "oakgtnldpsefihqmjcbr", 1, 10, S::npos);
+    test(S("qistfrgnmp"), "gbnaelosidmcjqktfhpr", 1, 19, S::npos);
+    test(S("bdnpfcqaem"), "akbripjhlosndcmqgfet", 1, 20, S::npos);
+    test(S("ectnhskflp"), "", 5, 0, 5);
+    test(S("fgtianblpq"), "pijag", 5, 0, 5);
+    test(S("mfeqklirnh"), "jrckd", 5, 1, 5);
+    test(S("astedncjhk"), "qcloh", 5, 2, 5);
+    test(S("fhlqgcajbr"), "thlmp", 5, 4, 5);
+    test(S("epfhocmdng"), "qidmo", 5, 5, 5);
+    test(S("apcnsibger"), "lnegpsjqrd", 5, 0, 5);
+    test(S("aqkocrbign"), "rjqdablmfs", 5, 1, 4);
+    test(S("ijsmdtqgce"), "enkgpbsjaq", 5, 5, 5);
+    test(S("clobgsrken"), "kdsgoaijfh", 5, 9, 3);
+    test(S("jbhcfposld"), "trfqgmckbe", 5, 10, 5);
+    test(S("oqnpblhide"), "igetsracjfkdnpoblhqm", 5, 0, 5);
+    test(S("lroeasctif"), "nqctfaogirshlekbdjpm", 5, 1, 5);
+    test(S("bpjlgmiedh"), "csehfgomljdqinbartkp", 5, 10, 1);
+    test(S("pamkeoidrj"), "qahoegcmplkfsjbdnitr", 5, 19, S::npos);
+    test(S("espogqbthk"), "dpteiajrqmsognhlfbkc", 5, 20, S::npos);
+    test(S("shoiedtcjb"), "", 9, 0, 9);
+    test(S("ebcinjgads"), "tqbnh", 9, 0, 9);
+    test(S("dqmregkcfl"), "akmle", 9, 1, 9);
+    test(S("ngcrieqajf"), "iqfkm", 9, 2, 9);
+    test(S("qosmilgnjb"), "tqjsr", 9, 4, 9);
+    test(S("ikabsjtdfl"), "jplqg", 9, 5, 8);
+    test(S("ersmicafdh"), "oilnrbcgtj", 9, 0, 9);
+    test(S("fdnplotmgh"), "morkglpesn", 9, 1, 9);
+    test(S("fdbicojerm"), "dmicerngat", 9, 5, 8);
+    test(S("mbtafndjcq"), "radgeskbtc", 9, 9, 9);
+    test(S("mlenkpfdtc"), "ljikprsmqo", 9, 10, 9);
+    test(S("ahlcifdqgs"), "trqihkcgsjamfdbolnpe", 9, 0, 9);
+    test(S("bgjemaltks"), "lqmthbsrekajgnofcipd", 9, 1, 9);
+    test(S("pdhslbqrfc"), "jtalmedribkgqsopcnfh", 9, 10, 9);
+    test(S("dirhtsnjkc"), "spqfoiclmtagejbndkrh", 9, 19, 3);
+    test(S("dlroktbcja"), "nmotklspigjrdhcfaebq", 9, 20, S::npos);
+    test(S("ncjpmaekbs"), "", 10, 0, 9);
+    test(S("hlbosgmrak"), "hpmsd", 10, 0, 9);
+    test(S("pqfhsgilen"), "qnpor", 10, 1, 9);
+    test(S("gqtjsbdckh"), "otdma", 10, 2, 9);
+    test(S("cfkqpjlegi"), "efhjg", 10, 4, 9);
+    test(S("beanrfodgj"), "odpte", 10, 5, 9);
+    test(S("adtkqpbjfi"), "bctdgfmolr", 10, 0, 9);
+    test(S("iomkfthagj"), "oaklidrbqg", 10, 1, 9);
+}
+
+template <class S>
+void test2()
+{
+    test(S("sdpcilonqj"), "dnjfsagktr", 10, 5, 8);
+    test(S("gtfbdkqeml"), "nejaktmiqg", 10, 9, 9);
+    test(S("bmeqgcdorj"), "pjqonlebsf", 10, 10, 8);
+    test(S("etqlcanmob"), "dshmnbtolcjepgaikfqr", 10, 0, 9);
+    test(S("roqmkbdtia"), "iogfhpabtjkqlrnemcds", 10, 1, 9);
+    test(S("kadsithljf"), "ngridfabjsecpqltkmoh", 10, 10, 7);
+    test(S("sgtkpbfdmh"), "athmknplcgofrqejsdib", 10, 19, 5);
+    test(S("qgmetnabkl"), "ldobhmqcafnjtkeisgrp", 10, 20, S::npos);
+    test(S("cqjohampgd"), "", 11, 0, 9);
+    test(S("hobitmpsan"), "aocjb", 11, 0, 9);
+    test(S("tjehkpsalm"), "jbrnk", 11, 1, 9);
+    test(S("ngfbojitcl"), "tqedg", 11, 2, 9);
+    test(S("rcfkdbhgjo"), "nqskp", 11, 4, 9);
+    test(S("qghptonrea"), "eaqkl", 11, 5, 7);
+    test(S("hnprfgqjdl"), "reaoicljqm", 11, 0, 9);
+    test(S("hlmgabenti"), "lsftgajqpm", 11, 1, 9);
+    test(S("ofcjanmrbs"), "rlpfogmits", 11, 5, 9);
+    test(S("jqedtkornm"), "shkncmiaqj", 11, 9, 7);
+    test(S("rfedlasjmg"), "fpnatrhqgs", 11, 10, 8);
+    test(S("talpqjsgkm"), "sjclemqhnpdbgikarfot", 11, 0, 9);
+    test(S("lrkcbtqpie"), "otcmedjikgsfnqbrhpla", 11, 1, 9);
+    test(S("cipogdskjf"), "bonsaefdqiprkhlgtjcm", 11, 10, 8);
+    test(S("nqedcojahi"), "egpscmahijlfnkrodqtb", 11, 19, S::npos);
+    test(S("hefnrkmctj"), "kmqbfepjthgilscrndoa", 11, 20, S::npos);
+    test(S("atqirnmekfjolhpdsgcb"), "", 0, 0, 0);
+    test(S("echfkmlpribjnqsaogtd"), "prboq", 0, 0, 0);
+    test(S("qnhiftdgcleajbpkrosm"), "fjcqh", 0, 1, 0);
+    test(S("chamfknorbedjitgslpq"), "fmosa", 0, 2, 0);
+    test(S("njhqpibfmtlkaecdrgso"), "qdbok", 0, 4, 0);
+    test(S("ebnghfsqkprmdcljoiat"), "amslg", 0, 5, 0);
+    test(S("letjomsgihfrpqbkancd"), "smpltjneqb", 0, 0, 0);
+    test(S("nblgoipcrqeaktshjdmf"), "flitskrnge", 0, 1, 0);
+    test(S("cehkbngtjoiflqapsmrd"), "pgqihmlbef", 0, 5, 0);
+    test(S("mignapfoklbhcqjetdrs"), "cfpdqjtgsb", 0, 9, 0);
+    test(S("ceatbhlsqjgpnokfrmdi"), "htpsiaflom", 0, 10, 0);
+    test(S("ocihkjgrdelpfnmastqb"), "kpjfiaceghsrdtlbnomq", 0, 0, 0);
+    test(S("noelgschdtbrjfmiqkap"), "qhtbomidljgafneksprc", 0, 1, 0);
+    test(S("dkclqfombepritjnghas"), "nhtjobkcefldimpsaqgr", 0, 10, 0);
+    test(S("miklnresdgbhqcojftap"), "prabcjfqnoeskilmtgdh", 0, 19, S::npos);
+    test(S("htbcigojaqmdkfrnlsep"), "dtrgmchilkasqoebfpjn", 0, 20, S::npos);
+    test(S("febhmqtjanokscdirpgl"), "", 1, 0, 1);
+    test(S("loakbsqjpcrdhftniegm"), "sqome", 1, 0, 1);
+    test(S("reagphsqflbitdcjmkno"), "smfte", 1, 1, 1);
+    test(S("jitlfrqemsdhkopncabg"), "ciboh", 1, 2, 0);
+    test(S("mhtaepscdnrjqgbkifol"), "haois", 1, 4, 0);
+    test(S("tocesrfmnglpbjihqadk"), "abfki", 1, 5, 1);
+    test(S("lpfmctjrhdagneskbqoi"), "frdkocntmq", 1, 0, 1);
+    test(S("lsmqaepkdhncirbtjfgo"), "oasbpedlnr", 1, 1, 1);
+    test(S("epoiqmtldrabnkjhcfsg"), "kltqmhgand", 1, 5, 1);
+    test(S("emgasrilpknqojhtbdcf"), "gdtfjchpmr", 1, 9, 0);
+    test(S("hnfiagdpcklrjetqbsom"), "ponmcqblet", 1, 10, 0);
+    test(S("nsdfebgajhmtricpoklq"), "sgphqdnofeiklatbcmjr", 1, 0, 1);
+    test(S("atjgfsdlpobmeiqhncrk"), "ljqprsmigtfoneadckbh", 1, 1, 1);
+    test(S("sitodfgnrejlahcbmqkp"), "ligeojhafnkmrcsqtbdp", 1, 10, 0);
+    test(S("fraghmbiceknltjpqosd"), "lsimqfnjarbopedkhcgt", 1, 19, S::npos);
+    test(S("pmafenlhqtdbkirjsogc"), "abedmfjlghniorcqptks", 1, 20, S::npos);
+    test(S("pihgmoeqtnakrjslcbfd"), "", 10, 0, 10);
+    test(S("gjdkeprctqblnhiafsom"), "hqtoa", 10, 0, 10);
+    test(S("mkpnblfdsahrcqijteog"), "cahif", 10, 1, 10);
+    test(S("gckarqnelodfjhmbptis"), "kehis", 10, 2, 10);
+    test(S("gqpskidtbclomahnrjfe"), "kdlmh", 10, 4, 9);
+    test(S("pkldjsqrfgitbhmaecno"), "paeql", 10, 5, 10);
+    test(S("aftsijrbeklnmcdqhgop"), "aghoqiefnb", 10, 0, 10);
+    test(S("mtlgdrhafjkbiepqnsoc"), "jrbqaikpdo", 10, 1, 10);
+    test(S("pqgirnaefthokdmbsclj"), "smjonaeqcl", 10, 5, 10);
+    test(S("kpdbgjmtherlsfcqoina"), "eqbdrkcfah", 10, 9, 8);
+    test(S("jrlbothiknqmdgcfasep"), "kapmsienhf", 10, 10, 10);
+    test(S("mjogldqferckabinptsh"), "jpqotrlenfcsbhkaimdg", 10, 0, 10);
+    test(S("apoklnefbhmgqcdrisjt"), "jlbmhnfgtcqprikeados", 10, 1, 10);
+    test(S("ifeopcnrjbhkdgatmqls"), "stgbhfmdaljnpqoicker", 10, 10, 8);
+    test(S("ckqhaiesmjdnrgolbtpf"), "oihcetflbjagdsrkmqpn", 10, 19, S::npos);
+    test(S("bnlgapfimcoterskqdjh"), "adtclebmnpjsrqfkigoh", 10, 20, S::npos);
+    test(S("kgdlrobpmjcthqsafeni"), "", 19, 0, 19);
+    test(S("dfkechomjapgnslbtqir"), "beafg", 19, 0, 19);
+    test(S("rloadknfbqtgmhcsipje"), "iclat", 19, 1, 19);
+    test(S("mgjhkolrnadqbpetcifs"), "rkhnf", 19, 2, 19);
+    test(S("cmlfakiojdrgtbsphqen"), "clshq", 19, 4, 19);
+    test(S("kghbfipeomsntdalrqjc"), "dtcoj", 19, 5, 17);
+    test(S("eldiqckrnmtasbghjfpo"), "rqosnjmfth", 19, 0, 19);
+    test(S("abqjcfedgotihlnspkrm"), "siatdfqglh", 19, 1, 19);
+    test(S("qfbadrtjsimkolcenhpg"), "mrlshtpgjq", 19, 5, 19);
+    test(S("abseghclkjqifmtodrnp"), "adlcskgqjt", 19, 9, 19);
+    test(S("ibmsnlrjefhtdokacqpg"), "drshcjknaf", 19, 10, 19);
+    test(S("mrkfciqjebaponsthldg"), "etsaqroinghpkjdlfcbm", 19, 0, 19);
+    test(S("mjkticdeoqshpalrfbgn"), "sgepdnkqliambtrocfhj", 19, 1, 19);
+    test(S("rqnoclbdejgiphtfsakm"), "nlmcjaqgbsortfdihkpe", 19, 10, 18);
+    test(S("plkqbhmtfaeodjcrsing"), "racfnpmosldibqkghjet", 19, 19, 7);
+    test(S("oegalhmstjrfickpbndq"), "fjhdsctkqeiolagrnmbp", 19, 20, S::npos);
+    test(S("rdtgjcaohpblniekmsfq"), "", 20, 0, 19);
+    test(S("ofkqbnjetrmsaidphglc"), "ejanp", 20, 0, 19);
+    test(S("grkpahljcftesdmonqib"), "odife", 20, 1, 19);
+    test(S("jimlgbhfqkteospardcn"), "okaqd", 20, 2, 19);
+    test(S("gftenihpmslrjkqadcob"), "lcdbi", 20, 4, 18);
+    test(S("bmhldogtckrfsanijepq"), "fsqbj", 20, 5, 18);
+    test(S("nfqkrpjdesabgtlcmoih"), "bigdomnplq", 20, 0, 19);
+    test(S("focalnrpiqmdkstehbjg"), "apiblotgcd", 20, 1, 19);
+    test(S("rhqdspkmebiflcotnjga"), "acfhdenops", 20, 5, 18);
+    test(S("rahdtmsckfboqlpniegj"), "jopdeamcrk", 20, 9, 18);
+    test(S("fbkeiopclstmdqranjhg"), "trqncbkgmh", 20, 10, 17);
+    test(S("lifhpdgmbconstjeqark"), "tomglrkencbsfjqpihda", 20, 0, 19);
+}
+
+template <class S>
+void test3()
+{
+    test(S("pboqganrhedjmltsicfk"), "gbkhdnpoietfcmrslajq", 20, 1, 19);
+    test(S("klchabsimetjnqgorfpd"), "rtfnmbsglkjaichoqedp", 20, 10, 19);
+    test(S("sirfgmjqhctndbklaepo"), "ohkmdpfqbsacrtjnlgei", 20, 19, 1);
+    test(S("rlbdsiceaonqjtfpghkm"), "dlbrteoisgphmkncajfq", 20, 20, S::npos);
+    test(S("ecgdanriptblhjfqskom"), "", 21, 0, 19);
+    test(S("fdmiarlpgcskbhoteqjn"), "sjrlo", 21, 0, 19);
+    test(S("rlbstjqopignecmfadkh"), "qjpor", 21, 1, 19);
+    test(S("grjpqmbshektdolcafni"), "odhfn", 21, 2, 19);
+    test(S("sakfcohtqnibprjmlged"), "qtfin", 21, 4, 19);
+    test(S("mjtdglasihqpocebrfkn"), "hpqfo", 21, 5, 19);
+    test(S("okaplfrntghqbmeicsdj"), "fabmertkos", 21, 0, 19);
+    test(S("sahngemrtcjidqbklfpo"), "brqtgkmaej", 21, 1, 19);
+    test(S("dlmsipcnekhbgoaftqjr"), "nfrdeihsgl", 21, 5, 18);
+    test(S("ahegrmqnoiklpfsdbcjt"), "hlfrosekpi", 21, 9, 19);
+    test(S("hdsjbnmlegtkqripacof"), "atgbkrjdsm", 21, 10, 19);
+    test(S("pcnedrfjihqbalkgtoms"), "blnrptjgqmaifsdkhoec", 21, 0, 19);
+    test(S("qjidealmtpskrbfhocng"), "ctpmdahebfqjgknloris", 21, 1, 19);
+    test(S("qeindtagmokpfhsclrbj"), "apnkeqthrmlbfodiscgj", 21, 10, 19);
+    test(S("kpfegbjhsrnodltqciam"), "jdgictpframeoqlsbknh", 21, 19, 7);
+    test(S("hnbrcplsjfgiktoedmaq"), "qprlsfojamgndekthibc", 21, 20, S::npos);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test0<S>();
+    test1<S>();
+    test2<S>();
+    test3<S>();
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.find_last_not_of( "",      0, 0) == SV::npos, "" );
+    static_assert (sv1.find_last_not_of( "irkhs", 0, 5) == SV::npos, "" );
+    static_assert (sv2.find_last_not_of( "",      0, 0) == 0, "" );
+    static_assert (sv2.find_last_not_of( "gfsrt", 5, 0) == 4, "" );
+    static_assert (sv2.find_last_not_of( "lecar", 5, 0) == 4, "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.find/find_last_not_of_string_view_size.pass.cpp

@@ -0,0 +1,148 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// size_type find_last_not_of(const basic_string& str, size_type pos = npos) const;
+
+#include <string_view>
+#include <cassert>
+
+template <class S>
+void
+test(const S& s, const S& str, typename S::size_type pos, typename S::size_type x)
+{
+    assert(s.find_last_not_of(str, pos) == x);
+    if (x != S::npos)
+        assert(x <= pos && x < s.size());
+}
+
+template <class S>
+void
+test(const S& s, const S& str, typename S::size_type x)
+{
+    assert(s.find_last_not_of(str) == x);
+    if (x != S::npos)
+        assert(x < s.size());
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), S(""), 0, S::npos);
+    test(S(""), S("laenf"), 0, S::npos);
+    test(S(""), S("pqlnkmbdjo"), 0, S::npos);
+    test(S(""), S("qkamfogpnljdcshbreti"), 0, S::npos);
+    test(S(""), S(""), 1, S::npos);
+    test(S(""), S("bjaht"), 1, S::npos);
+    test(S(""), S("hjlcmgpket"), 1, S::npos);
+    test(S(""), S("htaobedqikfplcgjsmrn"), 1, S::npos);
+    test(S("fodgq"), S(""), 0, 0);
+    test(S("qanej"), S("dfkap"), 0, 0);
+    test(S("clbao"), S("ihqrfebgad"), 0, 0);
+    test(S("mekdn"), S("ngtjfcalbseiqrphmkdo"), 0, S::npos);
+    test(S("srdfq"), S(""), 1, 1);
+    test(S("oemth"), S("ikcrq"), 1, 1);
+    test(S("cdaih"), S("dmajblfhsg"), 1, 0);
+    test(S("qohtk"), S("oqftjhdmkgsblacenirp"), 1, S::npos);
+    test(S("cshmd"), S(""), 2, 2);
+    test(S("lhcdo"), S("oebqi"), 2, 2);
+    test(S("qnsoh"), S("kojhpmbsfe"), 2, 1);
+    test(S("pkrof"), S("acbsjqogpltdkhinfrem"), 2, S::npos);
+    test(S("fmtsp"), S(""), 4, 4);
+    test(S("khbpm"), S("aobjd"), 4, 4);
+    test(S("pbsji"), S("pcbahntsje"), 4, 4);
+    test(S("mprdj"), S("fhepcrntkoagbmldqijs"), 4, S::npos);
+    test(S("eqmpa"), S(""), 5, 4);
+    test(S("omigs"), S("kocgb"), 5, 4);
+    test(S("onmje"), S("fbslrjiqkm"), 5, 4);
+    test(S("oqmrj"), S("jeidpcmalhfnqbgtrsko"), 5, S::npos);
+    test(S("schfa"), S(""), 6, 4);
+    test(S("igdsc"), S("qngpd"), 6, 4);
+    test(S("brqgo"), S("rodhqklgmb"), 6, S::npos);
+    test(S("tnrph"), S("thdjgafrlbkoiqcspmne"), 6, S::npos);
+    test(S("hcjitbfapl"), S(""), 0, 0);
+    test(S("daiprenocl"), S("ashjd"), 0, S::npos);
+    test(S("litpcfdghe"), S("mgojkldsqh"), 0, S::npos);
+    test(S("aidjksrolc"), S("imqnaghkfrdtlopbjesc"), 0, S::npos);
+    test(S("qpghtfbaji"), S(""), 1, 1);
+    test(S("gfshlcmdjr"), S("nadkh"), 1, 1);
+    test(S("nkodajteqp"), S("ofdrqmkebl"), 1, 0);
+    test(S("gbmetiprqd"), S("bdfjqgatlksriohemnpc"), 1, S::npos);
+    test(S("crnklpmegd"), S(""), 5, 5);
+    test(S("jsbtafedoc"), S("prqgn"), 5, 5);
+    test(S("qnmodrtkeb"), S("pejafmnokr"), 5, 4);
+    test(S("cpebqsfmnj"), S("odnqkgijrhabfmcestlp"), 5, S::npos);
+    test(S("lmofqdhpki"), S(""), 9, 9);
+    test(S("hnefkqimca"), S("rtjpa"), 9, 8);
+    test(S("drtasbgmfp"), S("ktsrmnqagd"), 9, 9);
+    test(S("lsaijeqhtr"), S("rtdhgcisbnmoaqkfpjle"), 9, S::npos);
+    test(S("elgofjmbrq"), S(""), 10, 9);
+    test(S("mjqdgalkpc"), S("dplqa"), 10, 9);
+    test(S("kthqnfcerm"), S("dkacjoptns"), 10, 9);
+    test(S("dfsjhanorc"), S("hqfimtrgnbekpdcsjalo"), 10, S::npos);
+    test(S("eqsgalomhb"), S(""), 11, 9);
+    test(S("akiteljmoh"), S("lofbc"), 11, 9);
+    test(S("hlbdfreqjo"), S("astoegbfpn"), 11, 8);
+    test(S("taqobhlerg"), S("pdgreqomsncafklhtibj"), 11, S::npos);
+    test(S("snafbdlghrjkpqtoceim"), S(""), 0, 0);
+    test(S("aemtbrgcklhndjisfpoq"), S("lbtqd"), 0, 0);
+    test(S("pnracgfkjdiholtbqsem"), S("tboimldpjh"), 0, S::npos);
+    test(S("dicfltehbsgrmojnpkaq"), S("slcerthdaiqjfnobgkpm"), 0, S::npos);
+    test(S("jlnkraeodhcspfgbqitm"), S(""), 1, 1);
+    test(S("lhosrngtmfjikbqpcade"), S("aqibs"), 1, 1);
+    test(S("rbtaqjhgkneisldpmfoc"), S("gtfblmqinc"), 1, 0);
+    test(S("gpifsqlrdkbonjtmheca"), S("mkqpbtdalgniorhfescj"), 1, S::npos);
+    test(S("hdpkobnsalmcfijregtq"), S(""), 10, 10);
+    test(S("jtlshdgqaiprkbcoenfm"), S("pblas"), 10, 9);
+    test(S("fkdrbqltsgmcoiphneaj"), S("arosdhcfme"), 10, 9);
+    test(S("crsplifgtqedjohnabmk"), S("blkhjeogicatqfnpdmsr"), 10, S::npos);
+    test(S("niptglfbosehkamrdqcj"), S(""), 19, 19);
+    test(S("copqdhstbingamjfkler"), S("djkqc"), 19, 19);
+    test(S("mrtaefilpdsgocnhqbjk"), S("lgokshjtpb"), 19, 16);
+    test(S("kojatdhlcmigpbfrqnes"), S("bqjhtkfepimcnsgrlado"), 19, S::npos);
+    test(S("eaintpchlqsbdgrkjofm"), S(""), 20, 19);
+    test(S("gjnhidfsepkrtaqbmclo"), S("nocfa"), 20, 18);
+    test(S("spocfaktqdbiejlhngmr"), S("bgtajmiedc"), 20, 19);
+    test(S("rphmlekgfscndtaobiqj"), S("lsckfnqgdahejiopbtmr"), 20, S::npos);
+    test(S("liatsqdoegkmfcnbhrpj"), S(""), 21, 19);
+    test(S("binjagtfldkrspcomqeh"), S("gfsrt"), 21, 19);
+    test(S("latkmisecnorjbfhqpdg"), S("pfsocbhjtm"), 21, 19);
+    test(S("lecfratdjkhnsmqpoigb"), S("tpflmdnoicjgkberhqsa"), 21, S::npos);
+}
+
+template <class S>
+void test1()
+{
+    test(S(""), S(""), S::npos);
+    test(S(""), S("laenf"), S::npos);
+    test(S(""), S("pqlnkmbdjo"), S::npos);
+    test(S(""), S("qkamfogpnljdcshbreti"), S::npos);
+    test(S("nhmko"), S(""), 4);
+    test(S("lahfb"), S("irkhs"), 4);
+    test(S("gmfhd"), S("kantesmpgj"), 4);
+    test(S("odaft"), S("oknlrstdpiqmjbaghcfe"), S::npos);
+    test(S("eolhfgpjqk"), S(""), 9);
+    test(S("nbatdlmekr"), S("bnrpe"), 8);
+    test(S("jdmciepkaq"), S("jtdaefblso"), 9);
+    test(S("hkbgspoflt"), S("oselktgbcapndfjihrmq"), S::npos);
+    test(S("gprdcokbnjhlsfmtieqa"), S(""), 19);
+    test(S("qjghlnftcaismkropdeb"), S("bjaht"), 18);
+    test(S("pnalfrdtkqcmojiesbhg"), S("hjlcmgpket"), 17);
+    test(S("pniotcfrhqsmgdkjbael"), S("htaobedqikfplcgjsmrn"), S::npos);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test0<S>();
+    test1<S>();
+    }
+}

test/std/strings/string.view/string.view.find/find_last_of_char_size.pass.cpp

@@ -0,0 +1,82 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr size_type find_last_of(charT c, size_type pos = npos) const;
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, typename S::value_type c, typename S::size_type pos,
+     typename S::size_type x)
+{
+    assert(s.find_last_of(c, pos) == x);
+    if (x != S::npos)
+        assert(x <= pos && x < s.size());
+}
+
+template <class S>
+void
+test(const S& s, typename S::value_type c, typename S::size_type x)
+{
+    assert(s.find_last_of(c) == x);
+    if (x != S::npos)
+        assert(x < s.size());
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test(S(""), 'm', 0, S::npos);
+    test(S(""), 'm', 1, S::npos);
+    test(S("kitcj"), 'm', 0, S::npos);
+    test(S("qkamf"), 'm', 1, S::npos);
+    test(S("nhmko"), 'm', 2, 2);
+    test(S("tpsaf"), 'm', 4, S::npos);
+    test(S("lahfb"), 'm', 5, S::npos);
+    test(S("irkhs"), 'm', 6, S::npos);
+    test(S("gmfhdaipsr"), 'm', 0, S::npos);
+    test(S("kantesmpgj"), 'm', 1, S::npos);
+    test(S("odaftiegpm"), 'm', 5, S::npos);
+    test(S("oknlrstdpi"), 'm', 9, S::npos);
+    test(S("eolhfgpjqk"), 'm', 10, S::npos);
+    test(S("pcdrofikas"), 'm', 11, S::npos);
+    test(S("nbatdlmekrgcfqsophij"), 'm', 0, S::npos);
+    test(S("bnrpehidofmqtcksjgla"), 'm', 1, S::npos);
+    test(S("jdmciepkaqgotsrfnhlb"), 'm', 10, 2);
+    test(S("jtdaefblsokrmhpgcnqi"), 'm', 19, 12);
+    test(S("hkbgspofltajcnedqmri"), 'm', 20, 17);
+    test(S("oselktgbcapndfjihrmq"), 'm', 21, 18);
+
+    test(S(""), 'm', S::npos);
+    test(S("csope"), 'm', S::npos);
+    test(S("gfsmthlkon"), 'm', 3);
+    test(S("laenfsbridchgotmkqpj"), 'm', 15);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.find_last_of( 'i', 0 ) == SV::npos, "" );
+    static_assert (sv1.find_last_of( 'i', 1 ) == SV::npos, "" );
+    static_assert (sv2.find_last_of( 'a', 0 ) == 0, "" );
+    static_assert (sv2.find_last_of( 'a', 1 ) == 0, "" );
+    static_assert (sv2.find_last_of( 'e', 5 ) == 4, "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.find/find_last_of_pointer_size.pass.cpp

@@ -0,0 +1,165 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr size_type find_last_of(const charT* s, size_type pos = npos) const;
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type pos,
+     typename S::size_type x)
+{
+    assert(s.find_last_of(str, pos) == x);
+    if (x != S::npos)
+        assert(x <= pos && x < s.size());
+}
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type x)
+{
+    assert(s.find_last_of(str) == x);
+    if (x != S::npos)
+        assert(x < s.size());
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), "", 0, S::npos);
+    test(S(""), "laenf", 0, S::npos);
+    test(S(""), "pqlnkmbdjo", 0, S::npos);
+    test(S(""), "qkamfogpnljdcshbreti", 0, S::npos);
+    test(S(""), "", 1, S::npos);
+    test(S(""), "bjaht", 1, S::npos);
+    test(S(""), "hjlcmgpket", 1, S::npos);
+    test(S(""), "htaobedqikfplcgjsmrn", 1, S::npos);
+    test(S("fodgq"), "", 0, S::npos);
+    test(S("qanej"), "dfkap", 0, S::npos);
+    test(S("clbao"), "ihqrfebgad", 0, S::npos);
+    test(S("mekdn"), "ngtjfcalbseiqrphmkdo", 0, 0);
+    test(S("srdfq"), "", 1, S::npos);
+    test(S("oemth"), "ikcrq", 1, S::npos);
+    test(S("cdaih"), "dmajblfhsg", 1, 1);
+    test(S("qohtk"), "oqftjhdmkgsblacenirp", 1, 1);
+    test(S("cshmd"), "", 2, S::npos);
+    test(S("lhcdo"), "oebqi", 2, S::npos);
+    test(S("qnsoh"), "kojhpmbsfe", 2, 2);
+    test(S("pkrof"), "acbsjqogpltdkhinfrem", 2, 2);
+    test(S("fmtsp"), "", 4, S::npos);
+    test(S("khbpm"), "aobjd", 4, 2);
+    test(S("pbsji"), "pcbahntsje", 4, 3);
+    test(S("mprdj"), "fhepcrntkoagbmldqijs", 4, 4);
+    test(S("eqmpa"), "", 5, S::npos);
+    test(S("omigs"), "kocgb", 5, 3);
+    test(S("onmje"), "fbslrjiqkm", 5, 3);
+    test(S("oqmrj"), "jeidpcmalhfnqbgtrsko", 5, 4);
+    test(S("schfa"), "", 6, S::npos);
+    test(S("igdsc"), "qngpd", 6, 2);
+    test(S("brqgo"), "rodhqklgmb", 6, 4);
+    test(S("tnrph"), "thdjgafrlbkoiqcspmne", 6, 4);
+    test(S("hcjitbfapl"), "", 0, S::npos);
+    test(S("daiprenocl"), "ashjd", 0, 0);
+    test(S("litpcfdghe"), "mgojkldsqh", 0, 0);
+    test(S("aidjksrolc"), "imqnaghkfrdtlopbjesc", 0, 0);
+    test(S("qpghtfbaji"), "", 1, S::npos);
+    test(S("gfshlcmdjr"), "nadkh", 1, S::npos);
+    test(S("nkodajteqp"), "ofdrqmkebl", 1, 1);
+    test(S("gbmetiprqd"), "bdfjqgatlksriohemnpc", 1, 1);
+    test(S("crnklpmegd"), "", 5, S::npos);
+    test(S("jsbtafedoc"), "prqgn", 5, S::npos);
+    test(S("qnmodrtkeb"), "pejafmnokr", 5, 5);
+    test(S("cpebqsfmnj"), "odnqkgijrhabfmcestlp", 5, 5);
+    test(S("lmofqdhpki"), "", 9, S::npos);
+    test(S("hnefkqimca"), "rtjpa", 9, 9);
+    test(S("drtasbgmfp"), "ktsrmnqagd", 9, 7);
+    test(S("lsaijeqhtr"), "rtdhgcisbnmoaqkfpjle", 9, 9);
+    test(S("elgofjmbrq"), "", 10, S::npos);
+    test(S("mjqdgalkpc"), "dplqa", 10, 8);
+    test(S("kthqnfcerm"), "dkacjoptns", 10, 6);
+    test(S("dfsjhanorc"), "hqfimtrgnbekpdcsjalo", 10, 9);
+    test(S("eqsgalomhb"), "", 11, S::npos);
+    test(S("akiteljmoh"), "lofbc", 11, 8);
+    test(S("hlbdfreqjo"), "astoegbfpn", 11, 9);
+    test(S("taqobhlerg"), "pdgreqomsncafklhtibj", 11, 9);
+    test(S("snafbdlghrjkpqtoceim"), "", 0, S::npos);
+    test(S("aemtbrgcklhndjisfpoq"), "lbtqd", 0, S::npos);
+    test(S("pnracgfkjdiholtbqsem"), "tboimldpjh", 0, 0);
+    test(S("dicfltehbsgrmojnpkaq"), "slcerthdaiqjfnobgkpm", 0, 0);
+    test(S("jlnkraeodhcspfgbqitm"), "", 1, S::npos);
+    test(S("lhosrngtmfjikbqpcade"), "aqibs", 1, S::npos);
+    test(S("rbtaqjhgkneisldpmfoc"), "gtfblmqinc", 1, 1);
+    test(S("gpifsqlrdkbonjtmheca"), "mkqpbtdalgniorhfescj", 1, 1);
+    test(S("hdpkobnsalmcfijregtq"), "", 10, S::npos);
+    test(S("jtlshdgqaiprkbcoenfm"), "pblas", 10, 10);
+    test(S("fkdrbqltsgmcoiphneaj"), "arosdhcfme", 10, 10);
+    test(S("crsplifgtqedjohnabmk"), "blkhjeogicatqfnpdmsr", 10, 10);
+    test(S("niptglfbosehkamrdqcj"), "", 19, S::npos);
+    test(S("copqdhstbingamjfkler"), "djkqc", 19, 16);
+    test(S("mrtaefilpdsgocnhqbjk"), "lgokshjtpb", 19, 19);
+    test(S("kojatdhlcmigpbfrqnes"), "bqjhtkfepimcnsgrlado", 19, 19);
+    test(S("eaintpchlqsbdgrkjofm"), "", 20, S::npos);
+    test(S("gjnhidfsepkrtaqbmclo"), "nocfa", 20, 19);
+    test(S("spocfaktqdbiejlhngmr"), "bgtajmiedc", 20, 18);
+    test(S("rphmlekgfscndtaobiqj"), "lsckfnqgdahejiopbtmr", 20, 19);
+    test(S("liatsqdoegkmfcnbhrpj"), "", 21, S::npos);
+    test(S("binjagtfldkrspcomqeh"), "gfsrt", 21, 12);
+    test(S("latkmisecnorjbfhqpdg"), "pfsocbhjtm", 21, 17);
+    test(S("lecfratdjkhnsmqpoigb"), "tpflmdnoicjgkberhqsa", 21, 19);
+}
+
+template <class S>
+void test1()
+{
+    test(S(""), "", S::npos);
+    test(S(""), "laenf", S::npos);
+    test(S(""), "pqlnkmbdjo", S::npos);
+    test(S(""), "qkamfogpnljdcshbreti", S::npos);
+    test(S("nhmko"), "", S::npos);
+    test(S("lahfb"), "irkhs", 2);
+    test(S("gmfhd"), "kantesmpgj", 1);
+    test(S("odaft"), "oknlrstdpiqmjbaghcfe", 4);
+    test(S("eolhfgpjqk"), "", S::npos);
+    test(S("nbatdlmekr"), "bnrpe", 9);
+    test(S("jdmciepkaq"), "jtdaefblso", 8);
+    test(S("hkbgspoflt"), "oselktgbcapndfjihrmq", 9);
+    test(S("gprdcokbnjhlsfmtieqa"), "", S::npos);
+    test(S("qjghlnftcaismkropdeb"), "bjaht", 19);
+    test(S("pnalfrdtkqcmojiesbhg"), "hjlcmgpket", 19);
+    test(S("pniotcfrhqsmgdkjbael"), "htaobedqikfplcgjsmrn", 19);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test0<S>();
+    test1<S>();
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.find_last_of( "",      0) == SV::npos, "" );
+    static_assert (sv1.find_last_of( "irkhs", 5) == SV::npos, "" );
+    static_assert (sv2.find_last_of( "",      0) == SV::npos, "" );
+    static_assert (sv2.find_last_of( "gfsrt", 5) == SV::npos, "" );
+    static_assert (sv2.find_last_of( "lecar", 5) == 4, "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.find/find_last_of_pointer_size_size.pass.cpp

@@ -0,0 +1,392 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr size_type find_last_of(const charT* s, size_type pos, size_type n) const;
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type pos,
+     typename S::size_type n, typename S::size_type x)
+{
+    assert(s.find_last_of(str, pos, n) == x);
+    if (x != S::npos)
+        assert(x <= pos && x < s.size());
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), "", 0, 0, S::npos);
+    test(S(""), "irkhs", 0, 0, S::npos);
+    test(S(""), "kante", 0, 1, S::npos);
+    test(S(""), "oknlr", 0, 2, S::npos);
+    test(S(""), "pcdro", 0, 4, S::npos);
+    test(S(""), "bnrpe", 0, 5, S::npos);
+    test(S(""), "jtdaefblso", 0, 0, S::npos);
+    test(S(""), "oselktgbca", 0, 1, S::npos);
+    test(S(""), "eqgaplhckj", 0, 5, S::npos);
+    test(S(""), "bjahtcmnlp", 0, 9, S::npos);
+    test(S(""), "hjlcmgpket", 0, 10, S::npos);
+    test(S(""), "htaobedqikfplcgjsmrn", 0, 0, S::npos);
+    test(S(""), "hpqiarojkcdlsgnmfetb", 0, 1, S::npos);
+    test(S(""), "dfkaprhjloqetcsimnbg", 0, 10, S::npos);
+    test(S(""), "ihqrfebgadntlpmjksoc", 0, 19, S::npos);
+    test(S(""), "ngtjfcalbseiqrphmkdo", 0, 20, S::npos);
+    test(S(""), "", 1, 0, S::npos);
+    test(S(""), "lbtqd", 1, 0, S::npos);
+    test(S(""), "tboim", 1, 1, S::npos);
+    test(S(""), "slcer", 1, 2, S::npos);
+    test(S(""), "cbjfs", 1, 4, S::npos);
+    test(S(""), "aqibs", 1, 5, S::npos);
+    test(S(""), "gtfblmqinc", 1, 0, S::npos);
+    test(S(""), "mkqpbtdalg", 1, 1, S::npos);
+    test(S(""), "kphatlimcd", 1, 5, S::npos);
+    test(S(""), "pblasqogic", 1, 9, S::npos);
+    test(S(""), "arosdhcfme", 1, 10, S::npos);
+    test(S(""), "blkhjeogicatqfnpdmsr", 1, 0, S::npos);
+    test(S(""), "bmhineprjcoadgstflqk", 1, 1, S::npos);
+    test(S(""), "djkqcmetslnghpbarfoi", 1, 10, S::npos);
+    test(S(""), "lgokshjtpbemarcdqnfi", 1, 19, S::npos);
+    test(S(""), "bqjhtkfepimcnsgrlado", 1, 20, S::npos);
+    test(S("eaint"), "", 0, 0, S::npos);
+    test(S("binja"), "gfsrt", 0, 0, S::npos);
+    test(S("latkm"), "pfsoc", 0, 1, S::npos);
+    test(S("lecfr"), "tpflm", 0, 2, S::npos);
+    test(S("eqkst"), "sgkec", 0, 4, 0);
+    test(S("cdafr"), "romds", 0, 5, S::npos);
+    test(S("prbhe"), "qhjistlgmr", 0, 0, S::npos);
+    test(S("lbisk"), "pedfirsglo", 0, 1, S::npos);
+    test(S("hrlpd"), "aqcoslgrmk", 0, 5, S::npos);
+    test(S("ehmja"), "dabckmepqj", 0, 9, 0);
+    test(S("mhqgd"), "pqscrjthli", 0, 10, S::npos);
+    test(S("tgklq"), "kfphdcsjqmobliagtren", 0, 0, S::npos);
+    test(S("bocjs"), "rokpefncljibsdhqtagm", 0, 1, S::npos);
+    test(S("grbsd"), "afionmkphlebtcjqsgrd", 0, 10, S::npos);
+    test(S("ofjqr"), "aenmqplidhkofrjbctsg", 0, 19, 0);
+    test(S("btlfi"), "osjmbtcadhiklegrpqnf", 0, 20, 0);
+    test(S("clrgb"), "", 1, 0, S::npos);
+    test(S("tjmek"), "osmia", 1, 0, S::npos);
+    test(S("bgstp"), "ckonl", 1, 1, S::npos);
+    test(S("hstrk"), "ilcaj", 1, 2, S::npos);
+    test(S("kmspj"), "lasiq", 1, 4, S::npos);
+    test(S("tjboh"), "kfqmr", 1, 5, S::npos);
+    test(S("ilbcj"), "klnitfaobg", 1, 0, S::npos);
+    test(S("jkngf"), "gjhmdlqikp", 1, 1, S::npos);
+    test(S("gfcql"), "skbgtahqej", 1, 5, 0);
+    test(S("dqtlg"), "bjsdgtlpkf", 1, 9, 0);
+    test(S("bthpg"), "bjgfmnlkio", 1, 10, 0);
+    test(S("dgsnq"), "lbhepotfsjdqigcnamkr", 1, 0, S::npos);
+    test(S("rmfhp"), "tebangckmpsrqdlfojhi", 1, 1, S::npos);
+    test(S("jfdam"), "joflqbdkhtegimscpanr", 1, 10, 1);
+    test(S("edapb"), "adpmcohetfbsrjinlqkg", 1, 19, 1);
+    test(S("brfsm"), "iacldqjpfnogbsrhmetk", 1, 20, 1);
+    test(S("ndrhl"), "", 2, 0, S::npos);
+    test(S("mrecp"), "otkgb", 2, 0, S::npos);
+    test(S("qlasf"), "cqsjl", 2, 1, S::npos);
+    test(S("smaqd"), "dpifl", 2, 2, S::npos);
+    test(S("hjeni"), "oapht", 2, 4, 0);
+    test(S("ocmfj"), "cifts", 2, 5, 1);
+    test(S("hmftq"), "nmsckbgalo", 2, 0, S::npos);
+    test(S("fklad"), "tpksqhamle", 2, 1, S::npos);
+    test(S("dirnm"), "tpdrchmkji", 2, 5, 2);
+    test(S("hrgdc"), "ijagfkblst", 2, 9, 2);
+    test(S("ifakg"), "kpocsignjb", 2, 10, 0);
+    test(S("ebrgd"), "pecqtkjsnbdrialgmohf", 2, 0, S::npos);
+    test(S("rcjml"), "aiortphfcmkjebgsndql", 2, 1, S::npos);
+    test(S("peqmt"), "sdbkeamglhipojqftrcn", 2, 10, 1);
+    test(S("frehn"), "ljqncehgmfktroapidbs", 2, 19, 2);
+    test(S("tqolf"), "rtcfodilamkbenjghqps", 2, 20, 2);
+    test(S("cjgao"), "", 4, 0, S::npos);
+    test(S("kjplq"), "mabns", 4, 0, S::npos);
+    test(S("herni"), "bdnrp", 4, 1, S::npos);
+    test(S("tadrb"), "scidp", 4, 2, S::npos);
+    test(S("pkfeo"), "agbjl", 4, 4, S::npos);
+    test(S("hoser"), "jfmpr", 4, 5, 4);
+    test(S("kgrsp"), "rbpefghsmj", 4, 0, S::npos);
+    test(S("pgejb"), "apsfntdoqc", 4, 1, S::npos);
+    test(S("thlnq"), "ndkjeisgcl", 4, 5, 3);
+    test(S("nbmit"), "rnfpqatdeo", 4, 9, 4);
+    test(S("jgmib"), "bntjlqrfik", 4, 10, 4);
+    test(S("ncrfj"), "kcrtmpolnaqejghsfdbi", 4, 0, S::npos);
+    test(S("ncsik"), "lobheanpkmqidsrtcfgj", 4, 1, S::npos);
+    test(S("sgbfh"), "athdkljcnreqbgpmisof", 4, 10, 4);
+    test(S("dktbn"), "qkdmjialrscpbhefgont", 4, 19, 4);
+    test(S("fthqm"), "dmasojntqleribkgfchp", 4, 20, 4);
+    test(S("klopi"), "", 5, 0, S::npos);
+    test(S("dajhn"), "psthd", 5, 0, S::npos);
+    test(S("jbgno"), "rpmjd", 5, 1, S::npos);
+    test(S("hkjae"), "dfsmk", 5, 2, S::npos);
+}
+
+template <class S>
+void test1()
+{
+    test(S("gbhqo"), "skqne", 5, 4, 3);
+    test(S("ktdor"), "kipnf", 5, 5, 0);
+    test(S("ldprn"), "hmrnqdgifl", 5, 0, S::npos);
+    test(S("egmjk"), "fsmjcdairn", 5, 1, S::npos);
+    test(S("armql"), "pcdgltbrfj", 5, 5, 4);
+    test(S("cdhjo"), "aekfctpirg", 5, 9, 0);
+    test(S("jcons"), "ledihrsgpf", 5, 10, 4);
+    test(S("cbrkp"), "mqcklahsbtirgopefndj", 5, 0, S::npos);
+    test(S("fhgna"), "kmlthaoqgecrnpdbjfis", 5, 1, S::npos);
+    test(S("ejfcd"), "sfhbamcdptojlkrenqgi", 5, 10, 4);
+    test(S("kqjhe"), "pbniofmcedrkhlstgaqj", 5, 19, 4);
+    test(S("pbdjl"), "mongjratcskbhqiepfdl", 5, 20, 4);
+    test(S("gajqn"), "", 6, 0, S::npos);
+    test(S("stedk"), "hrnat", 6, 0, S::npos);
+    test(S("tjkaf"), "gsqdt", 6, 1, S::npos);
+    test(S("dthpe"), "bspkd", 6, 2, S::npos);
+    test(S("klhde"), "ohcmb", 6, 4, 2);
+    test(S("bhlki"), "heatr", 6, 5, 1);
+    test(S("lqmoh"), "pmblckedfn", 6, 0, S::npos);
+    test(S("mtqin"), "aceqmsrbik", 6, 1, S::npos);
+    test(S("dpqbr"), "lmbtdehjrn", 6, 5, 3);
+    test(S("kdhmo"), "teqmcrlgib", 6, 9, 3);
+    test(S("jblqp"), "njolbmspac", 6, 10, 4);
+    test(S("qmjgl"), "pofnhidklamecrbqjgst", 6, 0, S::npos);
+    test(S("rothp"), "jbhckmtgrqnosafedpli", 6, 1, S::npos);
+    test(S("ghknq"), "dobntpmqklicsahgjerf", 6, 10, 4);
+    test(S("eopfi"), "tpdshainjkbfoemlrgcq", 6, 19, 4);
+    test(S("dsnmg"), "oldpfgeakrnitscbjmqh", 6, 20, 4);
+    test(S("jnkrfhotgl"), "", 0, 0, S::npos);
+    test(S("dltjfngbko"), "rqegt", 0, 0, S::npos);
+    test(S("bmjlpkiqde"), "dashm", 0, 1, S::npos);
+    test(S("skrflobnqm"), "jqirk", 0, 2, S::npos);
+    test(S("jkpldtshrm"), "rckeg", 0, 4, S::npos);
+    test(S("ghasdbnjqo"), "jscie", 0, 5, S::npos);
+    test(S("igrkhpbqjt"), "efsphndliq", 0, 0, S::npos);
+    test(S("ikthdgcamf"), "gdicosleja", 0, 1, S::npos);
+    test(S("pcofgeniam"), "qcpjibosfl", 0, 5, 0);
+    test(S("rlfjgesqhc"), "lrhmefnjcq", 0, 9, 0);
+    test(S("itphbqsker"), "dtablcrseo", 0, 10, S::npos);
+    test(S("skjafcirqm"), "apckjsftedbhgomrnilq", 0, 0, S::npos);
+    test(S("tcqomarsfd"), "pcbrgflehjtiadnsokqm", 0, 1, S::npos);
+    test(S("rocfeldqpk"), "nsiadegjklhobrmtqcpf", 0, 10, S::npos);
+    test(S("cfpegndlkt"), "cpmajdqnolikhgsbretf", 0, 19, 0);
+    test(S("fqbtnkeasj"), "jcflkntmgiqrphdosaeb", 0, 20, 0);
+    test(S("shbcqnmoar"), "", 1, 0, S::npos);
+    test(S("bdoshlmfin"), "ontrs", 1, 0, S::npos);
+    test(S("khfrebnsgq"), "pfkna", 1, 1, S::npos);
+    test(S("getcrsaoji"), "ekosa", 1, 2, 1);
+    test(S("fjiknedcpq"), "anqhk", 1, 4, S::npos);
+    test(S("tkejgnafrm"), "jekca", 1, 5, 1);
+    test(S("jnakolqrde"), "ikemsjgacf", 1, 0, S::npos);
+    test(S("lcjptsmgbe"), "arolgsjkhm", 1, 1, S::npos);
+    test(S("itfsmcjorl"), "oftkbldhre", 1, 5, 1);
+    test(S("omchkfrjea"), "gbkqdoeftl", 1, 9, 0);
+    test(S("cigfqkated"), "sqcflrgtim", 1, 10, 1);
+    test(S("tscenjikml"), "fmhbkislrjdpanogqcet", 1, 0, S::npos);
+    test(S("qcpaemsinf"), "rnioadktqlgpbcjsmhef", 1, 1, S::npos);
+    test(S("gltkojeipd"), "oakgtnldpsefihqmjcbr", 1, 10, 1);
+    test(S("qistfrgnmp"), "gbnaelosidmcjqktfhpr", 1, 19, 1);
+    test(S("bdnpfcqaem"), "akbripjhlosndcmqgfet", 1, 20, 1);
+    test(S("ectnhskflp"), "", 5, 0, S::npos);
+    test(S("fgtianblpq"), "pijag", 5, 0, S::npos);
+    test(S("mfeqklirnh"), "jrckd", 5, 1, S::npos);
+    test(S("astedncjhk"), "qcloh", 5, 2, S::npos);
+    test(S("fhlqgcajbr"), "thlmp", 5, 4, 2);
+    test(S("epfhocmdng"), "qidmo", 5, 5, 4);
+    test(S("apcnsibger"), "lnegpsjqrd", 5, 0, S::npos);
+    test(S("aqkocrbign"), "rjqdablmfs", 5, 1, 5);
+    test(S("ijsmdtqgce"), "enkgpbsjaq", 5, 5, S::npos);
+    test(S("clobgsrken"), "kdsgoaijfh", 5, 9, 5);
+    test(S("jbhcfposld"), "trfqgmckbe", 5, 10, 4);
+    test(S("oqnpblhide"), "igetsracjfkdnpoblhqm", 5, 0, S::npos);
+    test(S("lroeasctif"), "nqctfaogirshlekbdjpm", 5, 1, S::npos);
+    test(S("bpjlgmiedh"), "csehfgomljdqinbartkp", 5, 10, 5);
+    test(S("pamkeoidrj"), "qahoegcmplkfsjbdnitr", 5, 19, 5);
+    test(S("espogqbthk"), "dpteiajrqmsognhlfbkc", 5, 20, 5);
+    test(S("shoiedtcjb"), "", 9, 0, S::npos);
+    test(S("ebcinjgads"), "tqbnh", 9, 0, S::npos);
+    test(S("dqmregkcfl"), "akmle", 9, 1, S::npos);
+    test(S("ngcrieqajf"), "iqfkm", 9, 2, 6);
+    test(S("qosmilgnjb"), "tqjsr", 9, 4, 8);
+    test(S("ikabsjtdfl"), "jplqg", 9, 5, 9);
+    test(S("ersmicafdh"), "oilnrbcgtj", 9, 0, S::npos);
+    test(S("fdnplotmgh"), "morkglpesn", 9, 1, 7);
+    test(S("fdbicojerm"), "dmicerngat", 9, 5, 9);
+    test(S("mbtafndjcq"), "radgeskbtc", 9, 9, 6);
+    test(S("mlenkpfdtc"), "ljikprsmqo", 9, 10, 5);
+    test(S("ahlcifdqgs"), "trqihkcgsjamfdbolnpe", 9, 0, S::npos);
+    test(S("bgjemaltks"), "lqmthbsrekajgnofcipd", 9, 1, 6);
+    test(S("pdhslbqrfc"), "jtalmedribkgqsopcnfh", 9, 10, 7);
+    test(S("dirhtsnjkc"), "spqfoiclmtagejbndkrh", 9, 19, 9);
+    test(S("dlroktbcja"), "nmotklspigjrdhcfaebq", 9, 20, 9);
+    test(S("ncjpmaekbs"), "", 10, 0, S::npos);
+    test(S("hlbosgmrak"), "hpmsd", 10, 0, S::npos);
+    test(S("pqfhsgilen"), "qnpor", 10, 1, 1);
+    test(S("gqtjsbdckh"), "otdma", 10, 2, 2);
+    test(S("cfkqpjlegi"), "efhjg", 10, 4, 7);
+    test(S("beanrfodgj"), "odpte", 10, 5, 7);
+    test(S("adtkqpbjfi"), "bctdgfmolr", 10, 0, S::npos);
+    test(S("iomkfthagj"), "oaklidrbqg", 10, 1, 1);
+}
+
+template <class S>
+void test2()
+{
+    test(S("sdpcilonqj"), "dnjfsagktr", 10, 5, 9);
+    test(S("gtfbdkqeml"), "nejaktmiqg", 10, 9, 8);
+    test(S("bmeqgcdorj"), "pjqonlebsf", 10, 10, 9);
+    test(S("etqlcanmob"), "dshmnbtolcjepgaikfqr", 10, 0, S::npos);
+    test(S("roqmkbdtia"), "iogfhpabtjkqlrnemcds", 10, 1, 8);
+    test(S("kadsithljf"), "ngridfabjsecpqltkmoh", 10, 10, 9);
+    test(S("sgtkpbfdmh"), "athmknplcgofrqejsdib", 10, 19, 9);
+    test(S("qgmetnabkl"), "ldobhmqcafnjtkeisgrp", 10, 20, 9);
+    test(S("cqjohampgd"), "", 11, 0, S::npos);
+    test(S("hobitmpsan"), "aocjb", 11, 0, S::npos);
+    test(S("tjehkpsalm"), "jbrnk", 11, 1, 1);
+    test(S("ngfbojitcl"), "tqedg", 11, 2, 7);
+    test(S("rcfkdbhgjo"), "nqskp", 11, 4, 3);
+    test(S("qghptonrea"), "eaqkl", 11, 5, 9);
+    test(S("hnprfgqjdl"), "reaoicljqm", 11, 0, S::npos);
+    test(S("hlmgabenti"), "lsftgajqpm", 11, 1, 1);
+    test(S("ofcjanmrbs"), "rlpfogmits", 11, 5, 7);
+    test(S("jqedtkornm"), "shkncmiaqj", 11, 9, 9);
+    test(S("rfedlasjmg"), "fpnatrhqgs", 11, 10, 9);
+    test(S("talpqjsgkm"), "sjclemqhnpdbgikarfot", 11, 0, S::npos);
+    test(S("lrkcbtqpie"), "otcmedjikgsfnqbrhpla", 11, 1, S::npos);
+    test(S("cipogdskjf"), "bonsaefdqiprkhlgtjcm", 11, 10, 9);
+    test(S("nqedcojahi"), "egpscmahijlfnkrodqtb", 11, 19, 9);
+    test(S("hefnrkmctj"), "kmqbfepjthgilscrndoa", 11, 20, 9);
+    test(S("atqirnmekfjolhpdsgcb"), "", 0, 0, S::npos);
+    test(S("echfkmlpribjnqsaogtd"), "prboq", 0, 0, S::npos);
+    test(S("qnhiftdgcleajbpkrosm"), "fjcqh", 0, 1, S::npos);
+    test(S("chamfknorbedjitgslpq"), "fmosa", 0, 2, S::npos);
+    test(S("njhqpibfmtlkaecdrgso"), "qdbok", 0, 4, S::npos);
+    test(S("ebnghfsqkprmdcljoiat"), "amslg", 0, 5, S::npos);
+    test(S("letjomsgihfrpqbkancd"), "smpltjneqb", 0, 0, S::npos);
+    test(S("nblgoipcrqeaktshjdmf"), "flitskrnge", 0, 1, S::npos);
+    test(S("cehkbngtjoiflqapsmrd"), "pgqihmlbef", 0, 5, S::npos);
+    test(S("mignapfoklbhcqjetdrs"), "cfpdqjtgsb", 0, 9, S::npos);
+    test(S("ceatbhlsqjgpnokfrmdi"), "htpsiaflom", 0, 10, S::npos);
+    test(S("ocihkjgrdelpfnmastqb"), "kpjfiaceghsrdtlbnomq", 0, 0, S::npos);
+    test(S("noelgschdtbrjfmiqkap"), "qhtbomidljgafneksprc", 0, 1, S::npos);
+    test(S("dkclqfombepritjnghas"), "nhtjobkcefldimpsaqgr", 0, 10, S::npos);
+    test(S("miklnresdgbhqcojftap"), "prabcjfqnoeskilmtgdh", 0, 19, 0);
+    test(S("htbcigojaqmdkfrnlsep"), "dtrgmchilkasqoebfpjn", 0, 20, 0);
+    test(S("febhmqtjanokscdirpgl"), "", 1, 0, S::npos);
+    test(S("loakbsqjpcrdhftniegm"), "sqome", 1, 0, S::npos);
+    test(S("reagphsqflbitdcjmkno"), "smfte", 1, 1, S::npos);
+    test(S("jitlfrqemsdhkopncabg"), "ciboh", 1, 2, 1);
+    test(S("mhtaepscdnrjqgbkifol"), "haois", 1, 4, 1);
+    test(S("tocesrfmnglpbjihqadk"), "abfki", 1, 5, S::npos);
+    test(S("lpfmctjrhdagneskbqoi"), "frdkocntmq", 1, 0, S::npos);
+    test(S("lsmqaepkdhncirbtjfgo"), "oasbpedlnr", 1, 1, S::npos);
+    test(S("epoiqmtldrabnkjhcfsg"), "kltqmhgand", 1, 5, S::npos);
+    test(S("emgasrilpknqojhtbdcf"), "gdtfjchpmr", 1, 9, 1);
+    test(S("hnfiagdpcklrjetqbsom"), "ponmcqblet", 1, 10, 1);
+    test(S("nsdfebgajhmtricpoklq"), "sgphqdnofeiklatbcmjr", 1, 0, S::npos);
+    test(S("atjgfsdlpobmeiqhncrk"), "ljqprsmigtfoneadckbh", 1, 1, S::npos);
+    test(S("sitodfgnrejlahcbmqkp"), "ligeojhafnkmrcsqtbdp", 1, 10, 1);
+    test(S("fraghmbiceknltjpqosd"), "lsimqfnjarbopedkhcgt", 1, 19, 1);
+    test(S("pmafenlhqtdbkirjsogc"), "abedmfjlghniorcqptks", 1, 20, 1);
+    test(S("pihgmoeqtnakrjslcbfd"), "", 10, 0, S::npos);
+    test(S("gjdkeprctqblnhiafsom"), "hqtoa", 10, 0, S::npos);
+    test(S("mkpnblfdsahrcqijteog"), "cahif", 10, 1, S::npos);
+    test(S("gckarqnelodfjhmbptis"), "kehis", 10, 2, 7);
+    test(S("gqpskidtbclomahnrjfe"), "kdlmh", 10, 4, 10);
+    test(S("pkldjsqrfgitbhmaecno"), "paeql", 10, 5, 6);
+    test(S("aftsijrbeklnmcdqhgop"), "aghoqiefnb", 10, 0, S::npos);
+    test(S("mtlgdrhafjkbiepqnsoc"), "jrbqaikpdo", 10, 1, 9);
+    test(S("pqgirnaefthokdmbsclj"), "smjonaeqcl", 10, 5, 5);
+    test(S("kpdbgjmtherlsfcqoina"), "eqbdrkcfah", 10, 9, 10);
+    test(S("jrlbothiknqmdgcfasep"), "kapmsienhf", 10, 10, 9);
+    test(S("mjogldqferckabinptsh"), "jpqotrlenfcsbhkaimdg", 10, 0, S::npos);
+    test(S("apoklnefbhmgqcdrisjt"), "jlbmhnfgtcqprikeados", 10, 1, S::npos);
+    test(S("ifeopcnrjbhkdgatmqls"), "stgbhfmdaljnpqoicker", 10, 10, 10);
+    test(S("ckqhaiesmjdnrgolbtpf"), "oihcetflbjagdsrkmqpn", 10, 19, 10);
+    test(S("bnlgapfimcoterskqdjh"), "adtclebmnpjsrqfkigoh", 10, 20, 10);
+    test(S("kgdlrobpmjcthqsafeni"), "", 19, 0, S::npos);
+    test(S("dfkechomjapgnslbtqir"), "beafg", 19, 0, S::npos);
+    test(S("rloadknfbqtgmhcsipje"), "iclat", 19, 1, 16);
+    test(S("mgjhkolrnadqbpetcifs"), "rkhnf", 19, 2, 7);
+    test(S("cmlfakiojdrgtbsphqen"), "clshq", 19, 4, 16);
+    test(S("kghbfipeomsntdalrqjc"), "dtcoj", 19, 5, 19);
+    test(S("eldiqckrnmtasbghjfpo"), "rqosnjmfth", 19, 0, S::npos);
+    test(S("abqjcfedgotihlnspkrm"), "siatdfqglh", 19, 1, 15);
+    test(S("qfbadrtjsimkolcenhpg"), "mrlshtpgjq", 19, 5, 17);
+    test(S("abseghclkjqifmtodrnp"), "adlcskgqjt", 19, 9, 16);
+    test(S("ibmsnlrjefhtdokacqpg"), "drshcjknaf", 19, 10, 16);
+    test(S("mrkfciqjebaponsthldg"), "etsaqroinghpkjdlfcbm", 19, 0, S::npos);
+    test(S("mjkticdeoqshpalrfbgn"), "sgepdnkqliambtrocfhj", 19, 1, 10);
+    test(S("rqnoclbdejgiphtfsakm"), "nlmcjaqgbsortfdihkpe", 19, 10, 19);
+    test(S("plkqbhmtfaeodjcrsing"), "racfnpmosldibqkghjet", 19, 19, 19);
+    test(S("oegalhmstjrfickpbndq"), "fjhdsctkqeiolagrnmbp", 19, 20, 19);
+    test(S("rdtgjcaohpblniekmsfq"), "", 20, 0, S::npos);
+    test(S("ofkqbnjetrmsaidphglc"), "ejanp", 20, 0, S::npos);
+    test(S("grkpahljcftesdmonqib"), "odife", 20, 1, 15);
+    test(S("jimlgbhfqkteospardcn"), "okaqd", 20, 2, 12);
+    test(S("gftenihpmslrjkqadcob"), "lcdbi", 20, 4, 19);
+    test(S("bmhldogtckrfsanijepq"), "fsqbj", 20, 5, 19);
+    test(S("nfqkrpjdesabgtlcmoih"), "bigdomnplq", 20, 0, S::npos);
+    test(S("focalnrpiqmdkstehbjg"), "apiblotgcd", 20, 1, 3);
+    test(S("rhqdspkmebiflcotnjga"), "acfhdenops", 20, 5, 19);
+    test(S("rahdtmsckfboqlpniegj"), "jopdeamcrk", 20, 9, 19);
+    test(S("fbkeiopclstmdqranjhg"), "trqncbkgmh", 20, 10, 19);
+    test(S("lifhpdgmbconstjeqark"), "tomglrkencbsfjqpihda", 20, 0, S::npos);
+}
+
+template <class S>
+void test3()
+{
+    test(S("pboqganrhedjmltsicfk"), "gbkhdnpoietfcmrslajq", 20, 1, 4);
+    test(S("klchabsimetjnqgorfpd"), "rtfnmbsglkjaichoqedp", 20, 10, 17);
+    test(S("sirfgmjqhctndbklaepo"), "ohkmdpfqbsacrtjnlgei", 20, 19, 19);
+    test(S("rlbdsiceaonqjtfpghkm"), "dlbrteoisgphmkncajfq", 20, 20, 19);
+    test(S("ecgdanriptblhjfqskom"), "", 21, 0, S::npos);
+    test(S("fdmiarlpgcskbhoteqjn"), "sjrlo", 21, 0, S::npos);
+    test(S("rlbstjqopignecmfadkh"), "qjpor", 21, 1, 6);
+    test(S("grjpqmbshektdolcafni"), "odhfn", 21, 2, 13);
+    test(S("sakfcohtqnibprjmlged"), "qtfin", 21, 4, 10);
+    test(S("mjtdglasihqpocebrfkn"), "hpqfo", 21, 5, 17);
+    test(S("okaplfrntghqbmeicsdj"), "fabmertkos", 21, 0, S::npos);
+    test(S("sahngemrtcjidqbklfpo"), "brqtgkmaej", 21, 1, 14);
+    test(S("dlmsipcnekhbgoaftqjr"), "nfrdeihsgl", 21, 5, 19);
+    test(S("ahegrmqnoiklpfsdbcjt"), "hlfrosekpi", 21, 9, 14);
+    test(S("hdsjbnmlegtkqripacof"), "atgbkrjdsm", 21, 10, 16);
+    test(S("pcnedrfjihqbalkgtoms"), "blnrptjgqmaifsdkhoec", 21, 0, S::npos);
+    test(S("qjidealmtpskrbfhocng"), "ctpmdahebfqjgknloris", 21, 1, 17);
+    test(S("qeindtagmokpfhsclrbj"), "apnkeqthrmlbfodiscgj", 21, 10, 17);
+    test(S("kpfegbjhsrnodltqciam"), "jdgictpframeoqlsbknh", 21, 19, 19);
+    test(S("hnbrcplsjfgiktoedmaq"), "qprlsfojamgndekthibc", 21, 20, 19);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test0<S>();
+    test1<S>();
+    test2<S>();
+    test3<S>();
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.find_last_of( "",      0, 0) == SV::npos, "" );
+    static_assert (sv1.find_last_of( "irkhs", 0, 5) == SV::npos, "" );
+    static_assert (sv2.find_last_of( "",      0, 0) == SV::npos, "" );
+    static_assert (sv2.find_last_of( "gfsrt", 5, 5) == SV::npos, "" );
+    static_assert (sv2.find_last_of( "lecar", 5, 5) == 4, "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.find/find_last_of_string_view_size.pass.cpp

@@ -0,0 +1,148 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// size_type find_last_of(const basic_string& str, size_type pos = npos) const;
+
+#include <string_view>
+#include <cassert>
+
+template <class S>
+void
+test(const S& s, const S& str, typename S::size_type pos, typename S::size_type x)
+{
+    assert(s.find_last_of(str, pos) == x);
+    if (x != S::npos)
+        assert(x <= pos && x < s.size());
+}
+
+template <class S>
+void
+test(const S& s, const S& str, typename S::size_type x)
+{
+    assert(s.find_last_of(str) == x);
+    if (x != S::npos)
+        assert(x < s.size());
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), S(""), 0, S::npos);
+    test(S(""), S("laenf"), 0, S::npos);
+    test(S(""), S("pqlnkmbdjo"), 0, S::npos);
+    test(S(""), S("qkamfogpnljdcshbreti"), 0, S::npos);
+    test(S(""), S(""), 1, S::npos);
+    test(S(""), S("bjaht"), 1, S::npos);
+    test(S(""), S("hjlcmgpket"), 1, S::npos);
+    test(S(""), S("htaobedqikfplcgjsmrn"), 1, S::npos);
+    test(S("fodgq"), S(""), 0, S::npos);
+    test(S("qanej"), S("dfkap"), 0, S::npos);
+    test(S("clbao"), S("ihqrfebgad"), 0, S::npos);
+    test(S("mekdn"), S("ngtjfcalbseiqrphmkdo"), 0, 0);
+    test(S("srdfq"), S(""), 1, S::npos);
+    test(S("oemth"), S("ikcrq"), 1, S::npos);
+    test(S("cdaih"), S("dmajblfhsg"), 1, 1);
+    test(S("qohtk"), S("oqftjhdmkgsblacenirp"), 1, 1);
+    test(S("cshmd"), S(""), 2, S::npos);
+    test(S("lhcdo"), S("oebqi"), 2, S::npos);
+    test(S("qnsoh"), S("kojhpmbsfe"), 2, 2);
+    test(S("pkrof"), S("acbsjqogpltdkhinfrem"), 2, 2);
+    test(S("fmtsp"), S(""), 4, S::npos);
+    test(S("khbpm"), S("aobjd"), 4, 2);
+    test(S("pbsji"), S("pcbahntsje"), 4, 3);
+    test(S("mprdj"), S("fhepcrntkoagbmldqijs"), 4, 4);
+    test(S("eqmpa"), S(""), 5, S::npos);
+    test(S("omigs"), S("kocgb"), 5, 3);
+    test(S("onmje"), S("fbslrjiqkm"), 5, 3);
+    test(S("oqmrj"), S("jeidpcmalhfnqbgtrsko"), 5, 4);
+    test(S("schfa"), S(""), 6, S::npos);
+    test(S("igdsc"), S("qngpd"), 6, 2);
+    test(S("brqgo"), S("rodhqklgmb"), 6, 4);
+    test(S("tnrph"), S("thdjgafrlbkoiqcspmne"), 6, 4);
+    test(S("hcjitbfapl"), S(""), 0, S::npos);
+    test(S("daiprenocl"), S("ashjd"), 0, 0);
+    test(S("litpcfdghe"), S("mgojkldsqh"), 0, 0);
+    test(S("aidjksrolc"), S("imqnaghkfrdtlopbjesc"), 0, 0);
+    test(S("qpghtfbaji"), S(""), 1, S::npos);
+    test(S("gfshlcmdjr"), S("nadkh"), 1, S::npos);
+    test(S("nkodajteqp"), S("ofdrqmkebl"), 1, 1);
+    test(S("gbmetiprqd"), S("bdfjqgatlksriohemnpc"), 1, 1);
+    test(S("crnklpmegd"), S(""), 5, S::npos);
+    test(S("jsbtafedoc"), S("prqgn"), 5, S::npos);
+    test(S("qnmodrtkeb"), S("pejafmnokr"), 5, 5);
+    test(S("cpebqsfmnj"), S("odnqkgijrhabfmcestlp"), 5, 5);
+    test(S("lmofqdhpki"), S(""), 9, S::npos);
+    test(S("hnefkqimca"), S("rtjpa"), 9, 9);
+    test(S("drtasbgmfp"), S("ktsrmnqagd"), 9, 7);
+    test(S("lsaijeqhtr"), S("rtdhgcisbnmoaqkfpjle"), 9, 9);
+    test(S("elgofjmbrq"), S(""), 10, S::npos);
+    test(S("mjqdgalkpc"), S("dplqa"), 10, 8);
+    test(S("kthqnfcerm"), S("dkacjoptns"), 10, 6);
+    test(S("dfsjhanorc"), S("hqfimtrgnbekpdcsjalo"), 10, 9);
+    test(S("eqsgalomhb"), S(""), 11, S::npos);
+    test(S("akiteljmoh"), S("lofbc"), 11, 8);
+    test(S("hlbdfreqjo"), S("astoegbfpn"), 11, 9);
+    test(S("taqobhlerg"), S("pdgreqomsncafklhtibj"), 11, 9);
+    test(S("snafbdlghrjkpqtoceim"), S(""), 0, S::npos);
+    test(S("aemtbrgcklhndjisfpoq"), S("lbtqd"), 0, S::npos);
+    test(S("pnracgfkjdiholtbqsem"), S("tboimldpjh"), 0, 0);
+    test(S("dicfltehbsgrmojnpkaq"), S("slcerthdaiqjfnobgkpm"), 0, 0);
+    test(S("jlnkraeodhcspfgbqitm"), S(""), 1, S::npos);
+    test(S("lhosrngtmfjikbqpcade"), S("aqibs"), 1, S::npos);
+    test(S("rbtaqjhgkneisldpmfoc"), S("gtfblmqinc"), 1, 1);
+    test(S("gpifsqlrdkbonjtmheca"), S("mkqpbtdalgniorhfescj"), 1, 1);
+    test(S("hdpkobnsalmcfijregtq"), S(""), 10, S::npos);
+    test(S("jtlshdgqaiprkbcoenfm"), S("pblas"), 10, 10);
+    test(S("fkdrbqltsgmcoiphneaj"), S("arosdhcfme"), 10, 10);
+    test(S("crsplifgtqedjohnabmk"), S("blkhjeogicatqfnpdmsr"), 10, 10);
+    test(S("niptglfbosehkamrdqcj"), S(""), 19, S::npos);
+    test(S("copqdhstbingamjfkler"), S("djkqc"), 19, 16);
+    test(S("mrtaefilpdsgocnhqbjk"), S("lgokshjtpb"), 19, 19);
+    test(S("kojatdhlcmigpbfrqnes"), S("bqjhtkfepimcnsgrlado"), 19, 19);
+    test(S("eaintpchlqsbdgrkjofm"), S(""), 20, S::npos);
+    test(S("gjnhidfsepkrtaqbmclo"), S("nocfa"), 20, 19);
+    test(S("spocfaktqdbiejlhngmr"), S("bgtajmiedc"), 20, 18);
+    test(S("rphmlekgfscndtaobiqj"), S("lsckfnqgdahejiopbtmr"), 20, 19);
+    test(S("liatsqdoegkmfcnbhrpj"), S(""), 21, S::npos);
+    test(S("binjagtfldkrspcomqeh"), S("gfsrt"), 21, 12);
+    test(S("latkmisecnorjbfhqpdg"), S("pfsocbhjtm"), 21, 17);
+    test(S("lecfratdjkhnsmqpoigb"), S("tpflmdnoicjgkberhqsa"), 21, 19);
+}
+
+template <class S>
+void test1()
+{
+    test(S(""), S(""), S::npos);
+    test(S(""), S("laenf"), S::npos);
+    test(S(""), S("pqlnkmbdjo"), S::npos);
+    test(S(""), S("qkamfogpnljdcshbreti"), S::npos);
+    test(S("nhmko"), S(""), S::npos);
+    test(S("lahfb"), S("irkhs"), 2);
+    test(S("gmfhd"), S("kantesmpgj"), 1);
+    test(S("odaft"), S("oknlrstdpiqmjbaghcfe"), 4);
+    test(S("eolhfgpjqk"), S(""), S::npos);
+    test(S("nbatdlmekr"), S("bnrpe"), 9);
+    test(S("jdmciepkaq"), S("jtdaefblso"), 8);
+    test(S("hkbgspoflt"), S("oselktgbcapndfjihrmq"), 9);
+    test(S("gprdcokbnjhlsfmtieqa"), S(""), S::npos);
+    test(S("qjghlnftcaismkropdeb"), S("bjaht"), 19);
+    test(S("pnalfrdtkqcmojiesbhg"), S("hjlcmgpket"), 19);
+    test(S("pniotcfrhqsmgdkjbael"), S("htaobedqikfplcgjsmrn"), 19);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test0<S>();
+    test1<S>();
+    }
+}

test/std/strings/string.view/string.view.find/find_pointer_size.pass.cpp

@@ -0,0 +1,171 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// constexpr size_type find(const charT* s, size_type pos = 0) const;
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type pos,
+     typename S::size_type x)
+{
+    assert(s.find(str, pos) == x);
+    if (x != S::npos)
+    {
+        typename S::size_type n = S::traits_type::length(str);
+        assert(pos <= x && x + n <= s.size());
+    }
+}
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type x)
+{
+    assert(s.find(str) == x);
+    if (x != S::npos)
+    {
+        typename S::size_type n = S::traits_type::length(str);
+        assert(0 <= x && x + n <= s.size());
+    }
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), "", 0, 0);
+    test(S(""), "abcde", 0, S::npos);
+    test(S(""), "abcdeabcde", 0, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 0, S::npos);
+    test(S(""), "", 1, S::npos);
+    test(S(""), "abcde", 1, S::npos);
+    test(S(""), "abcdeabcde", 1, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 1, S::npos);
+    test(S("abcde"), "", 0, 0);
+    test(S("abcde"), "abcde", 0, 0);
+    test(S("abcde"), "abcdeabcde", 0, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 0, S::npos);
+    test(S("abcde"), "", 1, 1);
+    test(S("abcde"), "abcde", 1, S::npos);
+    test(S("abcde"), "abcdeabcde", 1, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 1, S::npos);
+    test(S("abcde"), "", 2, 2);
+    test(S("abcde"), "abcde", 2, S::npos);
+    test(S("abcde"), "abcdeabcde", 2, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 2, S::npos);
+    test(S("abcde"), "", 4, 4);
+    test(S("abcde"), "abcde", 4, S::npos);
+    test(S("abcde"), "abcdeabcde", 4, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 4, S::npos);
+    test(S("abcde"), "", 5, 5);
+    test(S("abcde"), "abcde", 5, S::npos);
+    test(S("abcde"), "abcdeabcde", 5, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 5, S::npos);
+    test(S("abcde"), "", 6, S::npos);
+    test(S("abcde"), "abcde", 6, S::npos);
+    test(S("abcde"), "abcdeabcde", 6, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 6, S::npos);
+    test(S("abcdeabcde"), "", 0, 0);
+    test(S("abcdeabcde"), "abcde", 0, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 0, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 0, S::npos);
+    test(S("abcdeabcde"), "", 1, 1);
+    test(S("abcdeabcde"), "abcde", 1, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 1, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 1, S::npos);
+    test(S("abcdeabcde"), "", 5, 5);
+    test(S("abcdeabcde"), "abcde", 5, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 5, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 5, S::npos);
+    test(S("abcdeabcde"), "", 9, 9);
+    test(S("abcdeabcde"), "abcde", 9, S::npos);
+    test(S("abcdeabcde"), "abcdeabcde", 9, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 9, S::npos);
+    test(S("abcdeabcde"), "", 10, 10);
+    test(S("abcdeabcde"), "abcde", 10, S::npos);
+    test(S("abcdeabcde"), "abcdeabcde", 10, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 10, S::npos);
+    test(S("abcdeabcde"), "", 11, S::npos);
+    test(S("abcdeabcde"), "abcde", 11, S::npos);
+    test(S("abcdeabcde"), "abcdeabcde", 11, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 11, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "", 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), "", 1, 1);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 1, 5);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 1, 5);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 1, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "", 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 10, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "", 19, 19);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 19, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 19, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 19, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "", 20, 20);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 20, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 20, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 20, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "", 21, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 21, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 21, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 21, S::npos);
+}
+
+template <class S>
+void test1()
+{
+    test(S(""), "", 0);
+    test(S(""), "abcde", S::npos);
+    test(S(""), "abcdeabcde", S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", S::npos);
+    test(S("abcde"), "", 0);
+    test(S("abcde"), "abcde", 0);
+    test(S("abcde"), "abcdeabcde", S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", S::npos);
+    test(S("abcdeabcde"), "", 0);
+    test(S("abcdeabcde"), "abcde", 0);
+    test(S("abcdeabcde"), "abcdeabcde", 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "", 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test0<S>();
+    test1<S>();
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.find( "") == 0, "" );
+    static_assert (sv1.find( "abcde") == SV::npos, "" );
+    static_assert (sv2.find( "") == 0, "" );
+    static_assert (sv2.find( "abcde") == 0, "" );
+    static_assert (sv2.find( "abcde", 1) == SV::npos, "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.find/find_pointer_size_size.pass.cpp

@@ -0,0 +1,393 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr size_type find(const charT* s, size_type pos, size_type n) const;
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type pos,
+     typename S::size_type n, typename S::size_type x)
+{
+    assert(s.find(str, pos, n) == x);
+    if (x != S::npos)
+        assert(pos <= x && x + n <= s.size());
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), "", 0, 0, 0);
+    test(S(""), "abcde", 0, 0, 0);
+    test(S(""), "abcde", 0, 1, S::npos);
+    test(S(""), "abcde", 0, 2, S::npos);
+    test(S(""), "abcde", 0, 4, S::npos);
+    test(S(""), "abcde", 0, 5, S::npos);
+    test(S(""), "abcdeabcde", 0, 0, 0);
+    test(S(""), "abcdeabcde", 0, 1, S::npos);
+    test(S(""), "abcdeabcde", 0, 5, S::npos);
+    test(S(""), "abcdeabcde", 0, 9, S::npos);
+    test(S(""), "abcdeabcde", 0, 10, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 0, 0, 0);
+    test(S(""), "abcdeabcdeabcdeabcde", 0, 1, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 0, 10, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 0, 19, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 0, 20, S::npos);
+    test(S(""), "", 1, 0, S::npos);
+    test(S(""), "abcde", 1, 0, S::npos);
+    test(S(""), "abcde", 1, 1, S::npos);
+    test(S(""), "abcde", 1, 2, S::npos);
+    test(S(""), "abcde", 1, 4, S::npos);
+    test(S(""), "abcde", 1, 5, S::npos);
+    test(S(""), "abcdeabcde", 1, 0, S::npos);
+    test(S(""), "abcdeabcde", 1, 1, S::npos);
+    test(S(""), "abcdeabcde", 1, 5, S::npos);
+    test(S(""), "abcdeabcde", 1, 9, S::npos);
+    test(S(""), "abcdeabcde", 1, 10, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 1, 0, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 1, 1, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 1, 10, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 1, 19, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 1, 20, S::npos);
+    test(S("abcde"), "", 0, 0, 0);
+    test(S("abcde"), "abcde", 0, 0, 0);
+    test(S("abcde"), "abcde", 0, 1, 0);
+    test(S("abcde"), "abcde", 0, 2, 0);
+    test(S("abcde"), "abcde", 0, 4, 0);
+    test(S("abcde"), "abcde", 0, 5, 0);
+    test(S("abcde"), "abcdeabcde", 0, 0, 0);
+    test(S("abcde"), "abcdeabcde", 0, 1, 0);
+    test(S("abcde"), "abcdeabcde", 0, 5, 0);
+    test(S("abcde"), "abcdeabcde", 0, 9, S::npos);
+    test(S("abcde"), "abcdeabcde", 0, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 0, 0, 0);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 0, 1, 0);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 0, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 0, 19, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 0, 20, S::npos);
+    test(S("abcde"), "", 1, 0, 1);
+    test(S("abcde"), "abcde", 1, 0, 1);
+    test(S("abcde"), "abcde", 1, 1, S::npos);
+    test(S("abcde"), "abcde", 1, 2, S::npos);
+    test(S("abcde"), "abcde", 1, 4, S::npos);
+    test(S("abcde"), "abcde", 1, 5, S::npos);
+    test(S("abcde"), "abcdeabcde", 1, 0, 1);
+    test(S("abcde"), "abcdeabcde", 1, 1, S::npos);
+    test(S("abcde"), "abcdeabcde", 1, 5, S::npos);
+    test(S("abcde"), "abcdeabcde", 1, 9, S::npos);
+    test(S("abcde"), "abcdeabcde", 1, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 1, 0, 1);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 1, 1, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 1, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 1, 19, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 1, 20, S::npos);
+    test(S("abcde"), "", 2, 0, 2);
+    test(S("abcde"), "abcde", 2, 0, 2);
+    test(S("abcde"), "abcde", 2, 1, S::npos);
+    test(S("abcde"), "abcde", 2, 2, S::npos);
+    test(S("abcde"), "abcde", 2, 4, S::npos);
+    test(S("abcde"), "abcde", 2, 5, S::npos);
+    test(S("abcde"), "abcdeabcde", 2, 0, 2);
+    test(S("abcde"), "abcdeabcde", 2, 1, S::npos);
+    test(S("abcde"), "abcdeabcde", 2, 5, S::npos);
+    test(S("abcde"), "abcdeabcde", 2, 9, S::npos);
+    test(S("abcde"), "abcdeabcde", 2, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 2, 0, 2);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 2, 1, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 2, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 2, 19, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 2, 20, S::npos);
+    test(S("abcde"), "", 4, 0, 4);
+    test(S("abcde"), "abcde", 4, 0, 4);
+    test(S("abcde"), "abcde", 4, 1, S::npos);
+    test(S("abcde"), "abcde", 4, 2, S::npos);
+    test(S("abcde"), "abcde", 4, 4, S::npos);
+    test(S("abcde"), "abcde", 4, 5, S::npos);
+    test(S("abcde"), "abcdeabcde", 4, 0, 4);
+    test(S("abcde"), "abcdeabcde", 4, 1, S::npos);
+    test(S("abcde"), "abcdeabcde", 4, 5, S::npos);
+    test(S("abcde"), "abcdeabcde", 4, 9, S::npos);
+    test(S("abcde"), "abcdeabcde", 4, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 4, 0, 4);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 4, 1, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 4, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 4, 19, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 4, 20, S::npos);
+    test(S("abcde"), "", 5, 0, 5);
+    test(S("abcde"), "abcde", 5, 0, 5);
+    test(S("abcde"), "abcde", 5, 1, S::npos);
+    test(S("abcde"), "abcde", 5, 2, S::npos);
+}
+
+template <class S>
+void test1()
+{
+    test(S("abcde"), "abcde", 5, 4, S::npos);
+    test(S("abcde"), "abcde", 5, 5, S::npos);
+    test(S("abcde"), "abcdeabcde", 5, 0, 5);
+    test(S("abcde"), "abcdeabcde", 5, 1, S::npos);
+    test(S("abcde"), "abcdeabcde", 5, 5, S::npos);
+    test(S("abcde"), "abcdeabcde", 5, 9, S::npos);
+    test(S("abcde"), "abcdeabcde", 5, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 5, 0, 5);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 5, 1, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 5, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 5, 19, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 5, 20, S::npos);
+    test(S("abcde"), "", 6, 0, S::npos);
+    test(S("abcde"), "abcde", 6, 0, S::npos);
+    test(S("abcde"), "abcde", 6, 1, S::npos);
+    test(S("abcde"), "abcde", 6, 2, S::npos);
+    test(S("abcde"), "abcde", 6, 4, S::npos);
+    test(S("abcde"), "abcde", 6, 5, S::npos);
+    test(S("abcde"), "abcdeabcde", 6, 0, S::npos);
+    test(S("abcde"), "abcdeabcde", 6, 1, S::npos);
+    test(S("abcde"), "abcdeabcde", 6, 5, S::npos);
+    test(S("abcde"), "abcdeabcde", 6, 9, S::npos);
+    test(S("abcde"), "abcdeabcde", 6, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 6, 0, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 6, 1, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 6, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 6, 19, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 6, 20, S::npos);
+    test(S("abcdeabcde"), "", 0, 0, 0);
+    test(S("abcdeabcde"), "abcde", 0, 0, 0);
+    test(S("abcdeabcde"), "abcde", 0, 1, 0);
+    test(S("abcdeabcde"), "abcde", 0, 2, 0);
+    test(S("abcdeabcde"), "abcde", 0, 4, 0);
+    test(S("abcdeabcde"), "abcde", 0, 5, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 0, 0, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 0, 1, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 0, 5, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 0, 9, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 0, 10, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 0, 0, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 0, 1, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 0, 10, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 0, 19, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 0, 20, S::npos);
+    test(S("abcdeabcde"), "", 1, 0, 1);
+    test(S("abcdeabcde"), "abcde", 1, 0, 1);
+    test(S("abcdeabcde"), "abcde", 1, 1, 5);
+    test(S("abcdeabcde"), "abcde", 1, 2, 5);
+    test(S("abcdeabcde"), "abcde", 1, 4, 5);
+    test(S("abcdeabcde"), "abcde", 1, 5, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 1, 0, 1);
+    test(S("abcdeabcde"), "abcdeabcde", 1, 1, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 1, 5, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 1, 9, S::npos);
+    test(S("abcdeabcde"), "abcdeabcde", 1, 10, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 1, 0, 1);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 1, 1, 5);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 1, 10, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 1, 19, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 1, 20, S::npos);
+    test(S("abcdeabcde"), "", 5, 0, 5);
+    test(S("abcdeabcde"), "abcde", 5, 0, 5);
+    test(S("abcdeabcde"), "abcde", 5, 1, 5);
+    test(S("abcdeabcde"), "abcde", 5, 2, 5);
+    test(S("abcdeabcde"), "abcde", 5, 4, 5);
+    test(S("abcdeabcde"), "abcde", 5, 5, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 5, 0, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 5, 1, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 5, 5, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 5, 9, S::npos);
+    test(S("abcdeabcde"), "abcdeabcde", 5, 10, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 5, 0, 5);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 5, 1, 5);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 5, 10, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 5, 19, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 5, 20, S::npos);
+    test(S("abcdeabcde"), "", 9, 0, 9);
+    test(S("abcdeabcde"), "abcde", 9, 0, 9);
+    test(S("abcdeabcde"), "abcde", 9, 1, S::npos);
+    test(S("abcdeabcde"), "abcde", 9, 2, S::npos);
+    test(S("abcdeabcde"), "abcde", 9, 4, S::npos);
+    test(S("abcdeabcde"), "abcde", 9, 5, S::npos);
+    test(S("abcdeabcde"), "abcdeabcde", 9, 0, 9);
+    test(S("abcdeabcde"), "abcdeabcde", 9, 1, S::npos);
+    test(S("abcdeabcde"), "abcdeabcde", 9, 5, S::npos);
+    test(S("abcdeabcde"), "abcdeabcde", 9, 9, S::npos);
+    test(S("abcdeabcde"), "abcdeabcde", 9, 10, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 9, 0, 9);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 9, 1, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 9, 10, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 9, 19, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 9, 20, S::npos);
+    test(S("abcdeabcde"), "", 10, 0, 10);
+    test(S("abcdeabcde"), "abcde", 10, 0, 10);
+    test(S("abcdeabcde"), "abcde", 10, 1, S::npos);
+    test(S("abcdeabcde"), "abcde", 10, 2, S::npos);
+    test(S("abcdeabcde"), "abcde", 10, 4, S::npos);
+    test(S("abcdeabcde"), "abcde", 10, 5, S::npos);
+    test(S("abcdeabcde"), "abcdeabcde", 10, 0, 10);
+    test(S("abcdeabcde"), "abcdeabcde", 10, 1, S::npos);
+}
+
+template <class S>
+void test2()
+{
+    test(S("abcdeabcde"), "abcdeabcde", 10, 5, S::npos);
+    test(S("abcdeabcde"), "abcdeabcde", 10, 9, S::npos);
+    test(S("abcdeabcde"), "abcdeabcde", 10, 10, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 10, 0, 10);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 10, 1, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 10, 10, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 10, 19, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 10, 20, S::npos);
+    test(S("abcdeabcde"), "", 11, 0, S::npos);
+    test(S("abcdeabcde"), "abcde", 11, 0, S::npos);
+    test(S("abcdeabcde"), "abcde", 11, 1, S::npos);
+    test(S("abcdeabcde"), "abcde", 11, 2, S::npos);
+    test(S("abcdeabcde"), "abcde", 11, 4, S::npos);
+    test(S("abcdeabcde"), "abcde", 11, 5, S::npos);
+    test(S("abcdeabcde"), "abcdeabcde", 11, 0, S::npos);
+    test(S("abcdeabcde"), "abcdeabcde", 11, 1, S::npos);
+    test(S("abcdeabcde"), "abcdeabcde", 11, 5, S::npos);
+    test(S("abcdeabcde"), "abcdeabcde", 11, 9, S::npos);
+    test(S("abcdeabcde"), "abcdeabcde", 11, 10, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 11, 0, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 11, 1, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 11, 10, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 11, 19, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 11, 20, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "", 0, 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 0, 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 0, 1, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 0, 2, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 0, 4, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 0, 5, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 0, 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 0, 1, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 0, 5, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 0, 9, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 0, 10, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0, 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0, 1, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0, 10, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0, 19, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0, 20, 0);
+    test(S("abcdeabcdeabcdeabcde"), "", 1, 0, 1);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 1, 0, 1);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 1, 1, 5);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 1, 2, 5);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 1, 4, 5);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 1, 5, 5);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 1, 0, 1);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 1, 1, 5);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 1, 5, 5);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 1, 9, 5);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 1, 10, 5);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 1, 0, 1);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 1, 1, 5);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 1, 10, 5);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 1, 19, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 1, 20, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "", 10, 0, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 10, 0, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 10, 1, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 10, 2, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 10, 4, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 10, 5, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 10, 0, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 10, 1, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 10, 5, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 10, 9, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 10, 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 10, 0, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 10, 1, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 10, 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 10, 19, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 10, 20, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "", 19, 0, 19);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 19, 0, 19);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 19, 1, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 19, 2, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 19, 4, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 19, 5, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 19, 0, 19);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 19, 1, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 19, 5, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 19, 9, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 19, 10, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 19, 0, 19);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 19, 1, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 19, 10, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 19, 19, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 19, 20, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "", 20, 0, 20);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 20, 0, 20);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 20, 1, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 20, 2, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 20, 4, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 20, 5, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 20, 0, 20);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 20, 1, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 20, 5, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 20, 9, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 20, 10, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 20, 0, 20);
+}
+
+template <class S>
+void test3()
+{
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 20, 1, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 20, 10, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 20, 19, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 20, 20, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "", 21, 0, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 21, 0, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 21, 1, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 21, 2, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 21, 4, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 21, 5, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 21, 0, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 21, 1, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 21, 5, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 21, 9, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 21, 10, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 21, 0, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 21, 1, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 21, 10, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 21, 19, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 21, 20, S::npos);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test0<S>();
+    test1<S>();
+    test2<S>();
+    test3<S>();
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.find( "",      0, 0 ) == 0, "" );
+    static_assert (sv1.find( "abcde", 0, 0 ) == 0, "" );
+    static_assert (sv1.find( "abcde", 0, 1 ) == SV::npos, "" );
+    static_assert (sv2.find( "",      0, 0 ) == 0, "" );
+    static_assert (sv2.find( "abcde", 0, 0 ) == 0, "" );
+    static_assert (sv2.find( "abcde", 0, 1 ) == 0, "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.find/find_string_view_size.pass.cpp

@@ -0,0 +1,164 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr size_type find(const basic_string_view& str, size_type pos = 0) const;
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, const S& str, typename S::size_type pos, typename S::size_type x)
+{
+    assert(s.find(str, pos) == x);
+    if (x != S::npos)
+        assert(pos <= x && x + str.size() <= s.size());
+}
+
+template <class S>
+void
+test(const S& s, const S& str, typename S::size_type x)
+{
+    assert(s.find(str) == x);
+    if (x != S::npos)
+        assert(0 <= x && x + str.size() <= s.size());
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), S(""), 0, 0);
+    test(S(""), S("abcde"), 0, S::npos);
+    test(S(""), S("abcdeabcde"), 0, S::npos);
+    test(S(""), S("abcdeabcdeabcdeabcde"), 0, S::npos);
+    test(S(""), S(""), 1, S::npos);
+    test(S(""), S("abcde"), 1, S::npos);
+    test(S(""), S("abcdeabcde"), 1, S::npos);
+    test(S(""), S("abcdeabcdeabcdeabcde"), 1, S::npos);
+    test(S("abcde"), S(""), 0, 0);
+    test(S("abcde"), S("abcde"), 0, 0);
+    test(S("abcde"), S("abcdeabcde"), 0, S::npos);
+    test(S("abcde"), S("abcdeabcdeabcdeabcde"), 0, S::npos);
+    test(S("abcde"), S(""), 1, 1);
+    test(S("abcde"), S("abcde"), 1, S::npos);
+    test(S("abcde"), S("abcdeabcde"), 1, S::npos);
+    test(S("abcde"), S("abcdeabcdeabcdeabcde"), 1, S::npos);
+    test(S("abcde"), S(""), 2, 2);
+    test(S("abcde"), S("abcde"), 2, S::npos);
+    test(S("abcde"), S("abcdeabcde"), 2, S::npos);
+    test(S("abcde"), S("abcdeabcdeabcdeabcde"), 2, S::npos);
+    test(S("abcde"), S(""), 4, 4);
+    test(S("abcde"), S("abcde"), 4, S::npos);
+    test(S("abcde"), S("abcdeabcde"), 4, S::npos);
+    test(S("abcde"), S("abcdeabcdeabcdeabcde"), 4, S::npos);
+    test(S("abcde"), S(""), 5, 5);
+    test(S("abcde"), S("abcde"), 5, S::npos);
+    test(S("abcde"), S("abcdeabcde"), 5, S::npos);
+    test(S("abcde"), S("abcdeabcdeabcdeabcde"), 5, S::npos);
+    test(S("abcde"), S(""), 6, S::npos);
+    test(S("abcde"), S("abcde"), 6, S::npos);
+    test(S("abcde"), S("abcdeabcde"), 6, S::npos);
+    test(S("abcde"), S("abcdeabcdeabcdeabcde"), 6, S::npos);
+    test(S("abcdeabcde"), S(""), 0, 0);
+    test(S("abcdeabcde"), S("abcde"), 0, 0);
+    test(S("abcdeabcde"), S("abcdeabcde"), 0, 0);
+    test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), 0, S::npos);
+    test(S("abcdeabcde"), S(""), 1, 1);
+    test(S("abcdeabcde"), S("abcde"), 1, 5);
+    test(S("abcdeabcde"), S("abcdeabcde"), 1, S::npos);
+    test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), 1, S::npos);
+    test(S("abcdeabcde"), S(""), 5, 5);
+    test(S("abcdeabcde"), S("abcde"), 5, 5);
+    test(S("abcdeabcde"), S("abcdeabcde"), 5, S::npos);
+    test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), 5, S::npos);
+    test(S("abcdeabcde"), S(""), 9, 9);
+    test(S("abcdeabcde"), S("abcde"), 9, S::npos);
+    test(S("abcdeabcde"), S("abcdeabcde"), 9, S::npos);
+    test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), 9, S::npos);
+    test(S("abcdeabcde"), S(""), 10, 10);
+    test(S("abcdeabcde"), S("abcde"), 10, S::npos);
+    test(S("abcdeabcde"), S("abcdeabcde"), 10, S::npos);
+    test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), 10, S::npos);
+    test(S("abcdeabcde"), S(""), 11, S::npos);
+    test(S("abcdeabcde"), S("abcde"), 11, S::npos);
+    test(S("abcdeabcde"), S("abcdeabcde"), 11, S::npos);
+    test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), 11, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), S(""), 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), S("abcde"), 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), S(""), 1, 1);
+    test(S("abcdeabcdeabcdeabcde"), S("abcde"), 1, 5);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 1, 5);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 1, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), S(""), 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), S("abcde"), 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 10, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), S(""), 19, 19);
+    test(S("abcdeabcdeabcdeabcde"), S("abcde"), 19, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 19, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 19, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), S(""), 20, 20);
+    test(S("abcdeabcdeabcdeabcde"), S("abcde"), 20, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 20, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 20, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), S(""), 21, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), S("abcde"), 21, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 21, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 21, S::npos);
+}
+
+template <class S>
+void test1()
+{
+    test(S(""), S(""), 0);
+    test(S(""), S("abcde"), S::npos);
+    test(S(""), S("abcdeabcde"), S::npos);
+    test(S(""), S("abcdeabcdeabcdeabcde"), S::npos);
+    test(S("abcde"), S(""), 0);
+    test(S("abcde"), S("abcde"), 0);
+    test(S("abcde"), S("abcdeabcde"), S::npos);
+    test(S("abcde"), S("abcdeabcdeabcdeabcde"), S::npos);
+    test(S("abcdeabcde"), S(""), 0);
+    test(S("abcdeabcde"), S("abcde"), 0);
+    test(S("abcdeabcde"), S("abcdeabcde"), 0);
+    test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), S::npos);
+    test(S("abcdeabcdeabcdeabcde"), S(""), 0);
+    test(S("abcdeabcdeabcdeabcde"), S("abcde"), 0);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 0);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 0);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test0<S>();
+    test1<S>();
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.find(sv1) == 0, "" );
+    static_assert (sv1.find(sv2) == SV::npos, "" );
+    static_assert (sv2.find(sv1) == 0, "" );
+    static_assert (sv2.find(sv2) == 0, "" );
+    static_assert (sv2.find(sv2, 1 ) == SV::npos, "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.find/rfind_char_size.pass.cpp

@@ -0,0 +1,83 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+// constexpr size_type rfind(charT c, size_type pos = npos) const;
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, typename S::value_type c, typename S::size_type pos,
+     typename S::size_type x)
+{
+    assert(s.rfind(c, pos) == x);
+    if (x != S::npos)
+        assert(x <= pos && x + 1 <= s.size());
+}
+
+template <class S>
+void
+test(const S& s, typename S::value_type c, typename S::size_type x)
+{
+    assert(s.rfind(c) == x);
+    if (x != S::npos)
+        assert(x + 1 <= s.size());
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test(S(""), 'b', 0, S::npos);
+    test(S(""), 'b', 1, S::npos);
+    test(S("abcde"), 'b', 0, S::npos);
+    test(S("abcde"), 'b', 1, 1);
+    test(S("abcde"), 'b', 2, 1);
+    test(S("abcde"), 'b', 4, 1);
+    test(S("abcde"), 'b', 5, 1);
+    test(S("abcde"), 'b', 6, 1);
+    test(S("abcdeabcde"), 'b', 0, S::npos);
+    test(S("abcdeabcde"), 'b', 1, 1);
+    test(S("abcdeabcde"), 'b', 5, 1);
+    test(S("abcdeabcde"), 'b', 9, 6);
+    test(S("abcdeabcde"), 'b', 10, 6);
+    test(S("abcdeabcde"), 'b', 11, 6);
+    test(S("abcdeabcdeabcdeabcde"), 'b', 0, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), 'b', 1, 1);
+    test(S("abcdeabcdeabcdeabcde"), 'b', 10, 6);
+    test(S("abcdeabcdeabcdeabcde"), 'b', 19, 16);
+    test(S("abcdeabcdeabcdeabcde"), 'b', 20, 16);
+    test(S("abcdeabcdeabcdeabcde"), 'b', 21, 16);
+
+    test(S(""), 'b', S::npos);
+    test(S("abcde"), 'b', 1);
+    test(S("abcdeabcde"), 'b', 6);
+    test(S("abcdeabcdeabcdeabcde"), 'b', 16);
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.rfind( 'b', 0 ) == SV::npos, "" );
+    static_assert (sv1.rfind( 'b', 1 ) == SV::npos, "" );
+    static_assert (sv2.rfind( 'b', 0 ) == SV::npos, "" );
+    static_assert (sv2.rfind( 'b', 1 ) == 1, "" );
+    static_assert (sv2.rfind( 'b', 2 ) == 1, "" );
+    static_assert (sv2.rfind( 'b', 3 ) == 1, "" );
+    static_assert (sv2.rfind( 'b', 4 ) == 1, "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.find/rfind_pointer_size.pass.cpp

@@ -0,0 +1,171 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+// constexpr size_type rfind(const charT* s, size_type pos = npos) const;
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type pos,
+     typename S::size_type x)
+{
+    assert(s.rfind(str, pos) == x);
+    if (x != S::npos)
+    {
+        typename S::size_type n = S::traits_type::length(str);
+        assert(x <= pos && x + n <= s.size());
+    }
+}
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type x)
+{
+    assert(s.rfind(str) == x);
+    if (x != S::npos)
+    {
+        typename S::size_type pos = s.size();
+        typename S::size_type n = S::traits_type::length(str);
+        assert(x <= pos && x + n <= s.size());
+    }
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), "", 0, 0);
+    test(S(""), "abcde", 0, S::npos);
+    test(S(""), "abcdeabcde", 0, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 0, S::npos);
+    test(S(""), "", 1, 0);
+    test(S(""), "abcde", 1, S::npos);
+    test(S(""), "abcdeabcde", 1, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 1, S::npos);
+    test(S("abcde"), "", 0, 0);
+    test(S("abcde"), "abcde", 0, 0);
+    test(S("abcde"), "abcdeabcde", 0, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 0, S::npos);
+    test(S("abcde"), "", 1, 1);
+    test(S("abcde"), "abcde", 1, 0);
+    test(S("abcde"), "abcdeabcde", 1, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 1, S::npos);
+    test(S("abcde"), "", 2, 2);
+    test(S("abcde"), "abcde", 2, 0);
+    test(S("abcde"), "abcdeabcde", 2, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 2, S::npos);
+    test(S("abcde"), "", 4, 4);
+    test(S("abcde"), "abcde", 4, 0);
+    test(S("abcde"), "abcdeabcde", 4, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 4, S::npos);
+    test(S("abcde"), "", 5, 5);
+    test(S("abcde"), "abcde", 5, 0);
+    test(S("abcde"), "abcdeabcde", 5, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 5, S::npos);
+    test(S("abcde"), "", 6, 5);
+    test(S("abcde"), "abcde", 6, 0);
+    test(S("abcde"), "abcdeabcde", 6, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 6, S::npos);
+    test(S("abcdeabcde"), "", 0, 0);
+    test(S("abcdeabcde"), "abcde", 0, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 0, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 0, S::npos);
+    test(S("abcdeabcde"), "", 1, 1);
+    test(S("abcdeabcde"), "abcde", 1, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 1, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 1, S::npos);
+    test(S("abcdeabcde"), "", 5, 5);
+    test(S("abcdeabcde"), "abcde", 5, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 5, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 5, S::npos);
+    test(S("abcdeabcde"), "", 9, 9);
+    test(S("abcdeabcde"), "abcde", 9, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 9, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 9, S::npos);
+    test(S("abcdeabcde"), "", 10, 10);
+    test(S("abcdeabcde"), "abcde", 10, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 10, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 10, S::npos);
+    test(S("abcdeabcde"), "", 11, 10);
+    test(S("abcdeabcde"), "abcde", 11, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 11, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 11, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "", 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), "", 1, 1);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 1, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 1, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 1, 0);
+    test(S("abcdeabcdeabcdeabcde"), "", 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 10, 0);
+    test(S("abcdeabcdeabcdeabcde"), "", 19, 19);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 19, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 19, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 19, 0);
+    test(S("abcdeabcdeabcdeabcde"), "", 20, 20);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 20, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 20, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 20, 0);
+    test(S("abcdeabcdeabcdeabcde"), "", 21, 20);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 21, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 21, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 21, 0);
+}
+
+template <class S>
+void test1()
+{
+    test(S(""), "", 0);
+    test(S(""), "abcde", S::npos);
+    test(S(""), "abcdeabcde", S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", S::npos);
+    test(S("abcde"), "", 5);
+    test(S("abcde"), "abcde", 0);
+    test(S("abcde"), "abcdeabcde", S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", S::npos);
+    test(S("abcdeabcde"), "", 10);
+    test(S("abcdeabcde"), "abcde", 5);
+    test(S("abcdeabcde"), "abcdeabcde", 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "", 20);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test0<S>();
+    test1<S>();
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.rfind( "") == 0, "" );
+    static_assert (sv1.rfind( "abcde") == SV::npos, "" );
+    static_assert (sv2.rfind( "") == 5, "" );
+    static_assert (sv2.rfind( "abcde") == 0, "" );
+    static_assert (sv2.rfind( "abcde", 1) == 0, "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.find/rfind_pointer_size_size.pass.cpp

@@ -0,0 +1,392 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+// constexpr size_type rfind(const charT* s, size_type pos, size_type n) const;
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, const typename S::value_type* str, typename S::size_type pos,
+      typename S::size_type n, typename S::size_type x)
+{
+    assert(s.rfind(str, pos, n) == x);
+    if (x != S::npos)
+        assert(x <= pos && x + n <= s.size());
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), "", 0, 0, 0);
+    test(S(""), "abcde", 0, 0, 0);
+    test(S(""), "abcde", 0, 1, S::npos);
+    test(S(""), "abcde", 0, 2, S::npos);
+    test(S(""), "abcde", 0, 4, S::npos);
+    test(S(""), "abcde", 0, 5, S::npos);
+    test(S(""), "abcdeabcde", 0, 0, 0);
+    test(S(""), "abcdeabcde", 0, 1, S::npos);
+    test(S(""), "abcdeabcde", 0, 5, S::npos);
+    test(S(""), "abcdeabcde", 0, 9, S::npos);
+    test(S(""), "abcdeabcde", 0, 10, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 0, 0, 0);
+    test(S(""), "abcdeabcdeabcdeabcde", 0, 1, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 0, 10, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 0, 19, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 0, 20, S::npos);
+    test(S(""), "", 1, 0, 0);
+    test(S(""), "abcde", 1, 0, 0);
+    test(S(""), "abcde", 1, 1, S::npos);
+    test(S(""), "abcde", 1, 2, S::npos);
+    test(S(""), "abcde", 1, 4, S::npos);
+    test(S(""), "abcde", 1, 5, S::npos);
+    test(S(""), "abcdeabcde", 1, 0, 0);
+    test(S(""), "abcdeabcde", 1, 1, S::npos);
+    test(S(""), "abcdeabcde", 1, 5, S::npos);
+    test(S(""), "abcdeabcde", 1, 9, S::npos);
+    test(S(""), "abcdeabcde", 1, 10, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 1, 0, 0);
+    test(S(""), "abcdeabcdeabcdeabcde", 1, 1, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 1, 10, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 1, 19, S::npos);
+    test(S(""), "abcdeabcdeabcdeabcde", 1, 20, S::npos);
+    test(S("abcde"), "", 0, 0, 0);
+    test(S("abcde"), "abcde", 0, 0, 0);
+    test(S("abcde"), "abcde", 0, 1, 0);
+    test(S("abcde"), "abcde", 0, 2, 0);
+    test(S("abcde"), "abcde", 0, 4, 0);
+    test(S("abcde"), "abcde", 0, 5, 0);
+    test(S("abcde"), "abcdeabcde", 0, 0, 0);
+    test(S("abcde"), "abcdeabcde", 0, 1, 0);
+    test(S("abcde"), "abcdeabcde", 0, 5, 0);
+    test(S("abcde"), "abcdeabcde", 0, 9, S::npos);
+    test(S("abcde"), "abcdeabcde", 0, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 0, 0, 0);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 0, 1, 0);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 0, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 0, 19, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 0, 20, S::npos);
+    test(S("abcde"), "", 1, 0, 1);
+    test(S("abcde"), "abcde", 1, 0, 1);
+    test(S("abcde"), "abcde", 1, 1, 0);
+    test(S("abcde"), "abcde", 1, 2, 0);
+    test(S("abcde"), "abcde", 1, 4, 0);
+    test(S("abcde"), "abcde", 1, 5, 0);
+    test(S("abcde"), "abcdeabcde", 1, 0, 1);
+    test(S("abcde"), "abcdeabcde", 1, 1, 0);
+    test(S("abcde"), "abcdeabcde", 1, 5, 0);
+    test(S("abcde"), "abcdeabcde", 1, 9, S::npos);
+    test(S("abcde"), "abcdeabcde", 1, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 1, 0, 1);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 1, 1, 0);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 1, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 1, 19, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 1, 20, S::npos);
+    test(S("abcde"), "", 2, 0, 2);
+    test(S("abcde"), "abcde", 2, 0, 2);
+    test(S("abcde"), "abcde", 2, 1, 0);
+    test(S("abcde"), "abcde", 2, 2, 0);
+    test(S("abcde"), "abcde", 2, 4, 0);
+    test(S("abcde"), "abcde", 2, 5, 0);
+    test(S("abcde"), "abcdeabcde", 2, 0, 2);
+    test(S("abcde"), "abcdeabcde", 2, 1, 0);
+    test(S("abcde"), "abcdeabcde", 2, 5, 0);
+    test(S("abcde"), "abcdeabcde", 2, 9, S::npos);
+    test(S("abcde"), "abcdeabcde", 2, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 2, 0, 2);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 2, 1, 0);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 2, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 2, 19, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 2, 20, S::npos);
+    test(S("abcde"), "", 4, 0, 4);
+    test(S("abcde"), "abcde", 4, 0, 4);
+    test(S("abcde"), "abcde", 4, 1, 0);
+    test(S("abcde"), "abcde", 4, 2, 0);
+    test(S("abcde"), "abcde", 4, 4, 0);
+    test(S("abcde"), "abcde", 4, 5, 0);
+    test(S("abcde"), "abcdeabcde", 4, 0, 4);
+    test(S("abcde"), "abcdeabcde", 4, 1, 0);
+    test(S("abcde"), "abcdeabcde", 4, 5, 0);
+    test(S("abcde"), "abcdeabcde", 4, 9, S::npos);
+    test(S("abcde"), "abcdeabcde", 4, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 4, 0, 4);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 4, 1, 0);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 4, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 4, 19, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 4, 20, S::npos);
+    test(S("abcde"), "", 5, 0, 5);
+    test(S("abcde"), "abcde", 5, 0, 5);
+    test(S("abcde"), "abcde", 5, 1, 0);
+    test(S("abcde"), "abcde", 5, 2, 0);
+}
+
+template <class S>
+void test1()
+{
+    test(S("abcde"), "abcde", 5, 4, 0);
+    test(S("abcde"), "abcde", 5, 5, 0);
+    test(S("abcde"), "abcdeabcde", 5, 0, 5);
+    test(S("abcde"), "abcdeabcde", 5, 1, 0);
+    test(S("abcde"), "abcdeabcde", 5, 5, 0);
+    test(S("abcde"), "abcdeabcde", 5, 9, S::npos);
+    test(S("abcde"), "abcdeabcde", 5, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 5, 0, 5);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 5, 1, 0);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 5, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 5, 19, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 5, 20, S::npos);
+    test(S("abcde"), "", 6, 0, 5);
+    test(S("abcde"), "abcde", 6, 0, 5);
+    test(S("abcde"), "abcde", 6, 1, 0);
+    test(S("abcde"), "abcde", 6, 2, 0);
+    test(S("abcde"), "abcde", 6, 4, 0);
+    test(S("abcde"), "abcde", 6, 5, 0);
+    test(S("abcde"), "abcdeabcde", 6, 0, 5);
+    test(S("abcde"), "abcdeabcde", 6, 1, 0);
+    test(S("abcde"), "abcdeabcde", 6, 5, 0);
+    test(S("abcde"), "abcdeabcde", 6, 9, S::npos);
+    test(S("abcde"), "abcdeabcde", 6, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 6, 0, 5);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 6, 1, 0);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 6, 10, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 6, 19, S::npos);
+    test(S("abcde"), "abcdeabcdeabcdeabcde", 6, 20, S::npos);
+    test(S("abcdeabcde"), "", 0, 0, 0);
+    test(S("abcdeabcde"), "abcde", 0, 0, 0);
+    test(S("abcdeabcde"), "abcde", 0, 1, 0);
+    test(S("abcdeabcde"), "abcde", 0, 2, 0);
+    test(S("abcdeabcde"), "abcde", 0, 4, 0);
+    test(S("abcdeabcde"), "abcde", 0, 5, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 0, 0, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 0, 1, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 0, 5, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 0, 9, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 0, 10, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 0, 0, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 0, 1, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 0, 10, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 0, 19, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 0, 20, S::npos);
+    test(S("abcdeabcde"), "", 1, 0, 1);
+    test(S("abcdeabcde"), "abcde", 1, 0, 1);
+    test(S("abcdeabcde"), "abcde", 1, 1, 0);
+    test(S("abcdeabcde"), "abcde", 1, 2, 0);
+    test(S("abcdeabcde"), "abcde", 1, 4, 0);
+    test(S("abcdeabcde"), "abcde", 1, 5, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 1, 0, 1);
+    test(S("abcdeabcde"), "abcdeabcde", 1, 1, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 1, 5, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 1, 9, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 1, 10, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 1, 0, 1);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 1, 1, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 1, 10, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 1, 19, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 1, 20, S::npos);
+    test(S("abcdeabcde"), "", 5, 0, 5);
+    test(S("abcdeabcde"), "abcde", 5, 0, 5);
+    test(S("abcdeabcde"), "abcde", 5, 1, 5);
+    test(S("abcdeabcde"), "abcde", 5, 2, 5);
+    test(S("abcdeabcde"), "abcde", 5, 4, 5);
+    test(S("abcdeabcde"), "abcde", 5, 5, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 5, 0, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 5, 1, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 5, 5, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 5, 9, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 5, 10, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 5, 0, 5);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 5, 1, 5);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 5, 10, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 5, 19, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 5, 20, S::npos);
+    test(S("abcdeabcde"), "", 9, 0, 9);
+    test(S("abcdeabcde"), "abcde", 9, 0, 9);
+    test(S("abcdeabcde"), "abcde", 9, 1, 5);
+    test(S("abcdeabcde"), "abcde", 9, 2, 5);
+    test(S("abcdeabcde"), "abcde", 9, 4, 5);
+    test(S("abcdeabcde"), "abcde", 9, 5, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 9, 0, 9);
+    test(S("abcdeabcde"), "abcdeabcde", 9, 1, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 9, 5, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 9, 9, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 9, 10, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 9, 0, 9);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 9, 1, 5);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 9, 10, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 9, 19, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 9, 20, S::npos);
+    test(S("abcdeabcde"), "", 10, 0, 10);
+    test(S("abcdeabcde"), "abcde", 10, 0, 10);
+    test(S("abcdeabcde"), "abcde", 10, 1, 5);
+    test(S("abcdeabcde"), "abcde", 10, 2, 5);
+    test(S("abcdeabcde"), "abcde", 10, 4, 5);
+    test(S("abcdeabcde"), "abcde", 10, 5, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 10, 0, 10);
+    test(S("abcdeabcde"), "abcdeabcde", 10, 1, 5);
+}
+
+template <class S>
+void test2()
+{
+    test(S("abcdeabcde"), "abcdeabcde", 10, 5, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 10, 9, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 10, 10, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 10, 0, 10);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 10, 1, 5);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 10, 10, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 10, 19, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 10, 20, S::npos);
+    test(S("abcdeabcde"), "", 11, 0, 10);
+    test(S("abcdeabcde"), "abcde", 11, 0, 10);
+    test(S("abcdeabcde"), "abcde", 11, 1, 5);
+    test(S("abcdeabcde"), "abcde", 11, 2, 5);
+    test(S("abcdeabcde"), "abcde", 11, 4, 5);
+    test(S("abcdeabcde"), "abcde", 11, 5, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 11, 0, 10);
+    test(S("abcdeabcde"), "abcdeabcde", 11, 1, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 11, 5, 5);
+    test(S("abcdeabcde"), "abcdeabcde", 11, 9, 0);
+    test(S("abcdeabcde"), "abcdeabcde", 11, 10, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 11, 0, 10);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 11, 1, 5);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 11, 10, 0);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 11, 19, S::npos);
+    test(S("abcdeabcde"), "abcdeabcdeabcdeabcde", 11, 20, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), "", 0, 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 0, 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 0, 1, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 0, 2, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 0, 4, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 0, 5, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 0, 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 0, 1, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 0, 5, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 0, 9, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 0, 10, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0, 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0, 1, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0, 10, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0, 19, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 0, 20, 0);
+    test(S("abcdeabcdeabcdeabcde"), "", 1, 0, 1);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 1, 0, 1);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 1, 1, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 1, 2, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 1, 4, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 1, 5, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 1, 0, 1);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 1, 1, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 1, 5, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 1, 9, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 1, 10, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 1, 0, 1);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 1, 1, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 1, 10, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 1, 19, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 1, 20, 0);
+    test(S("abcdeabcdeabcdeabcde"), "", 10, 0, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 10, 0, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 10, 1, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 10, 2, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 10, 4, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 10, 5, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 10, 0, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 10, 1, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 10, 5, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 10, 9, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 10, 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 10, 0, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 10, 1, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 10, 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 10, 19, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 10, 20, 0);
+    test(S("abcdeabcdeabcdeabcde"), "", 19, 0, 19);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 19, 0, 19);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 19, 1, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 19, 2, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 19, 4, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 19, 5, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 19, 0, 19);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 19, 1, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 19, 5, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 19, 9, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 19, 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 19, 0, 19);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 19, 1, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 19, 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 19, 19, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 19, 20, 0);
+    test(S("abcdeabcdeabcdeabcde"), "", 20, 0, 20);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 20, 0, 20);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 20, 1, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 20, 2, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 20, 4, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 20, 5, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 20, 0, 20);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 20, 1, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 20, 5, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 20, 9, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 20, 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 20, 0, 20);
+}
+
+template <class S>
+void test3()
+{
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 20, 1, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 20, 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 20, 19, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 20, 20, 0);
+    test(S("abcdeabcdeabcdeabcde"), "", 21, 0, 20);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 21, 0, 20);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 21, 1, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 21, 2, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 21, 4, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcde", 21, 5, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 21, 0, 20);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 21, 1, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 21, 5, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 21, 9, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcde", 21, 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 21, 0, 20);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 21, 1, 15);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 21, 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 21, 19, 0);
+    test(S("abcdeabcdeabcdeabcde"), "abcdeabcdeabcdeabcde", 21, 20, 0);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test0<S>();
+    test1<S>();
+    test2<S>();
+    test3<S>();
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.rfind( "",      0, 0 ) == 0, "" );
+    static_assert (sv1.rfind( "abcde", 0, 0 ) == 0, "" );
+    static_assert (sv1.rfind( "abcde", 0, 1 ) == SV::npos, "" );
+    static_assert (sv2.rfind( "",      0, 0 ) == 0, "" );
+    static_assert (sv2.rfind( "abcde", 0, 0 ) == 0, "" );
+    static_assert (sv2.rfind( "abcde", 0, 1 ) == 0, "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.find/rfind_string_view_size.pass.cpp

@@ -0,0 +1,164 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr size_type rfind(const basic_string& str, size_type pos = npos) const;
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+template <class S>
+void
+test(const S& s, const S& str, typename S::size_type pos, typename S::size_type x)
+{
+    assert(s.rfind(str, pos) == x);
+    if (x != S::npos)
+        assert(x <= pos && x + str.size() <= s.size());
+}
+
+template <class S>
+void
+test(const S& s, const S& str, typename S::size_type x)
+{
+    assert(s.rfind(str) == x);
+    if (x != S::npos)
+        assert(0 <= x && x + str.size() <= s.size());
+}
+
+template <class S>
+void test0()
+{
+    test(S(""), S(""), 0, 0);
+    test(S(""), S("abcde"), 0, S::npos);
+    test(S(""), S("abcdeabcde"), 0, S::npos);
+    test(S(""), S("abcdeabcdeabcdeabcde"), 0, S::npos);
+    test(S(""), S(""), 1, 0);
+    test(S(""), S("abcde"), 1, S::npos);
+    test(S(""), S("abcdeabcde"), 1, S::npos);
+    test(S(""), S("abcdeabcdeabcdeabcde"), 1, S::npos);
+    test(S("abcde"), S(""), 0, 0);
+    test(S("abcde"), S("abcde"), 0, 0);
+    test(S("abcde"), S("abcdeabcde"), 0, S::npos);
+    test(S("abcde"), S("abcdeabcdeabcdeabcde"), 0, S::npos);
+    test(S("abcde"), S(""), 1, 1);
+    test(S("abcde"), S("abcde"), 1, 0);
+    test(S("abcde"), S("abcdeabcde"), 1, S::npos);
+    test(S("abcde"), S("abcdeabcdeabcdeabcde"), 1, S::npos);
+    test(S("abcde"), S(""), 2, 2);
+    test(S("abcde"), S("abcde"), 2, 0);
+    test(S("abcde"), S("abcdeabcde"), 2, S::npos);
+    test(S("abcde"), S("abcdeabcdeabcdeabcde"), 2, S::npos);
+    test(S("abcde"), S(""), 4, 4);
+    test(S("abcde"), S("abcde"), 4, 0);
+    test(S("abcde"), S("abcdeabcde"), 4, S::npos);
+    test(S("abcde"), S("abcdeabcdeabcdeabcde"), 4, S::npos);
+    test(S("abcde"), S(""), 5, 5);
+    test(S("abcde"), S("abcde"), 5, 0);
+    test(S("abcde"), S("abcdeabcde"), 5, S::npos);
+    test(S("abcde"), S("abcdeabcdeabcdeabcde"), 5, S::npos);
+    test(S("abcde"), S(""), 6, 5);
+    test(S("abcde"), S("abcde"), 6, 0);
+    test(S("abcde"), S("abcdeabcde"), 6, S::npos);
+    test(S("abcde"), S("abcdeabcdeabcdeabcde"), 6, S::npos);
+    test(S("abcdeabcde"), S(""), 0, 0);
+    test(S("abcdeabcde"), S("abcde"), 0, 0);
+    test(S("abcdeabcde"), S("abcdeabcde"), 0, 0);
+    test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), 0, S::npos);
+    test(S("abcdeabcde"), S(""), 1, 1);
+    test(S("abcdeabcde"), S("abcde"), 1, 0);
+    test(S("abcdeabcde"), S("abcdeabcde"), 1, 0);
+    test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), 1, S::npos);
+    test(S("abcdeabcde"), S(""), 5, 5);
+    test(S("abcdeabcde"), S("abcde"), 5, 5);
+    test(S("abcdeabcde"), S("abcdeabcde"), 5, 0);
+    test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), 5, S::npos);
+    test(S("abcdeabcde"), S(""), 9, 9);
+    test(S("abcdeabcde"), S("abcde"), 9, 5);
+    test(S("abcdeabcde"), S("abcdeabcde"), 9, 0);
+    test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), 9, S::npos);
+    test(S("abcdeabcde"), S(""), 10, 10);
+    test(S("abcdeabcde"), S("abcde"), 10, 5);
+    test(S("abcdeabcde"), S("abcdeabcde"), 10, 0);
+    test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), 10, S::npos);
+    test(S("abcdeabcde"), S(""), 11, 10);
+    test(S("abcdeabcde"), S("abcde"), 11, 5);
+    test(S("abcdeabcde"), S("abcdeabcde"), 11, 0);
+    test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), 11, S::npos);
+    test(S("abcdeabcdeabcdeabcde"), S(""), 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), S("abcde"), 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 0, 0);
+    test(S("abcdeabcdeabcdeabcde"), S(""), 1, 1);
+    test(S("abcdeabcdeabcdeabcde"), S("abcde"), 1, 0);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 1, 0);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 1, 0);
+    test(S("abcdeabcdeabcdeabcde"), S(""), 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), S("abcde"), 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 10, 10);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 10, 0);
+    test(S("abcdeabcdeabcdeabcde"), S(""), 19, 19);
+    test(S("abcdeabcdeabcdeabcde"), S("abcde"), 19, 15);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 19, 10);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 19, 0);
+    test(S("abcdeabcdeabcdeabcde"), S(""), 20, 20);
+    test(S("abcdeabcdeabcdeabcde"), S("abcde"), 20, 15);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 20, 10);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 20, 0);
+    test(S("abcdeabcdeabcdeabcde"), S(""), 21, 20);
+    test(S("abcdeabcdeabcdeabcde"), S("abcde"), 21, 15);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 21, 10);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 21, 0);
+}
+
+template <class S>
+void test1()
+{
+    test(S(""), S(""), 0);
+    test(S(""), S("abcde"), S::npos);
+    test(S(""), S("abcdeabcde"), S::npos);
+    test(S(""), S("abcdeabcdeabcdeabcde"), S::npos);
+    test(S("abcde"), S(""), 5);
+    test(S("abcde"), S("abcde"), 0);
+    test(S("abcde"), S("abcdeabcde"), S::npos);
+    test(S("abcde"), S("abcdeabcdeabcdeabcde"), S::npos);
+    test(S("abcdeabcde"), S(""), 10);
+    test(S("abcdeabcde"), S("abcde"), 5);
+    test(S("abcdeabcde"), S("abcdeabcde"), 0);
+    test(S("abcdeabcde"), S("abcdeabcdeabcdeabcde"), S::npos);
+    test(S("abcdeabcdeabcdeabcde"), S(""), 20);
+    test(S("abcdeabcdeabcdeabcde"), S("abcde"), 15);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcde"), 10);
+    test(S("abcdeabcdeabcdeabcde"), S("abcdeabcdeabcdeabcde"), 0);
+}
+
+int main()
+{
+    {
+    typedef std::string_view S;
+    test0<S>();
+    test1<S>();
+    }
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+
+    static_assert (sv1.rfind(sv1) == 0, "" );
+    static_assert (sv1.rfind(sv2) == SV::npos, "" );
+    static_assert (sv2.rfind(sv1) == 5, "" );
+    static_assert (sv2.rfind(sv2) == 0, "" );
+    static_assert (sv2.rfind(sv2, 1) == 0, "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.hash/string_view.pass.cpp

@@ -0,0 +1,55 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <functional>
+
+// template <class T>
+// struct hash
+//     : public unary_function<T, size_t>
+// {
+//     size_t operator()(T val) const;
+// };
+
+// Not very portable
+
+#include <string_view>
+#include <cassert>
+#include <type_traits>
+
+using std::string_view;
+
+template <class T>
+void
+test()
+{
+    typedef std::hash<T> H;
+    static_assert((std::is_same<typename H::argument_type, T>::value), "" );
+    static_assert((std::is_same<typename H::result_type, std::size_t>::value), "" );
+    H h;
+//     std::string g1 = "1234567890";
+//     std::string g2 = "1234567891";
+    typedef typename T::value_type char_type;
+    char_type g1 [ 10 ];
+    char_type g2 [ 10 ];
+    for ( int i = 0; i < 10; ++i )
+        g1[i] = g2[9-i] = '0' + i;
+    T s1(g1, 10);
+    T s2(g2, 10);
+    assert(h(s1) != h(s2));
+}
+
+int main()
+{
+    test<std::string_view>();
+#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS
+    test<std::u16string_view>();
+    test<std::u32string_view>();
+#endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
+    test<std::wstring_view>();
+}

test/std/strings/string.view/string.view.io/stream_insert.pass.cpp

@@ -0,0 +1,58 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits, class Allocator>
+//   basic_ostream<charT, traits>&
+//   operator<<(basic_ostream<charT, traits>& os,
+//              const basic_string_view<charT,traits> str);
+
+#include <string_view>
+#include <sstream>
+#include <cassert>
+
+using std::string_view;
+using std::wstring_view;
+
+int main()
+{
+    {
+        std::ostringstream out;
+        string_view sv("some text");
+        out << sv;
+        assert(out.good());
+        assert(sv == out.str());
+    }
+    {
+        std::ostringstream out;
+        std::string s("some text");
+        string_view sv(s);
+        out.width(12);
+        out << sv;
+        assert(out.good());
+        assert("   " + s == out.str());
+    }
+    {
+        std::wostringstream out;
+        wstring_view sv(L"some text");
+        out << sv;
+        assert(out.good());
+        assert(sv == out.str());
+    }
+    {
+        std::wostringstream out;
+        std::wstring s(L"some text");
+        wstring_view sv(s);
+        out.width(12);
+        out << sv;
+        assert(out.good());
+        assert(L"   " + s == out.str());
+    }
+}

test/std/strings/string.view/string.view.iterators/begin.pass.cpp

@@ -0,0 +1,79 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr const_iterator begin() const;
+
+#include <string_view>
+#include <cassert>
+
+#include "test_macros.h"
+
+template <class S>
+void
+test(S s)
+{
+    const S& cs = s;
+    typename S::iterator b = s.begin();
+    typename S::const_iterator cb1 = cs.begin();
+    typename S::const_iterator cb2 = s.cbegin();
+    if (!s.empty())
+    {
+        assert(   *b ==  s[0]);
+        assert(  &*b == &s[0]);
+        assert( *cb1 ==  s[0]);
+        assert(&*cb1 == &s[0]);
+        assert( *cb2 ==  s[0]);
+        assert(&*cb2 == &s[0]);
+
+    }
+    assert(  b == cb1);
+    assert(  b == cb2);
+    assert(cb1 == cb2);
+}
+
+
+int main()
+{
+    typedef std::string_view    string_view;
+    typedef std::u16string_view u16string_view;
+    typedef std::u32string_view u32string_view;
+    typedef std::wstring_view   wstring_view;
+
+    test(string_view   ());
+    test(u16string_view());
+    test(u32string_view());
+    test(wstring_view  ());
+    test(string_view   ( "123"));
+    test(wstring_view  (L"123"));
+#if TEST_STD_VER >= 11
+    test(u16string_view{u"123"});
+    test(u32string_view{U"123"});
+#endif
+
+#if _LIBCPP_STD_VER > 11
+    {
+    constexpr string_view       sv { "123", 3 };
+    constexpr u16string_view u16sv {u"123", 3 };
+    constexpr u32string_view u32sv {U"123", 3 };
+    constexpr wstring_view     wsv {L"123", 3 };
+
+    static_assert (    *sv.begin() ==    sv[0], "" );
+    static_assert ( *u16sv.begin() == u16sv[0], "" );
+    static_assert ( *u32sv.begin() == u32sv[0], "" );
+    static_assert (   *wsv.begin() ==   wsv[0], "" );
+
+    static_assert (    *sv.cbegin() ==    sv[0], "" );
+    static_assert ( *u16sv.cbegin() == u16sv[0], "" );
+    static_assert ( *u32sv.cbegin() == u32sv[0], "" );
+    static_assert (   *wsv.cbegin() ==   wsv[0], "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.iterators/end.pass.cpp

@@ -0,0 +1,87 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr const_iterator end() const;
+
+#include <string_view>
+#include <cassert>
+
+#include "test_macros.h"
+
+template <class S>
+void
+test(S s)
+{
+    const S& cs = s;
+    typename S::iterator e = s.end();
+    typename S::const_iterator ce1 = cs.end();
+    typename S::const_iterator ce2 = s.cend();
+
+    if (s.empty())
+    {
+        assert(  e ==  s.begin());
+        assert(ce1 == cs.begin());
+        assert(ce2 ==  s.begin());
+    }
+    else
+    {
+        assert(  e !=  s.begin());
+        assert(ce1 != cs.begin());
+        assert(ce2 !=  s.begin());
+    }
+
+    assert(  e -  s.begin() == s.size());
+    assert(ce1 - cs.begin() == cs.size());
+    assert(ce2 - s.cbegin() == s.size());
+
+    assert(  e == ce1);
+    assert(  e == ce2);
+    assert(ce1 == ce2);
+}
+
+
+int main()
+{
+    typedef std::string_view    string_view;
+    typedef std::u16string_view u16string_view;
+    typedef std::u32string_view u32string_view;
+    typedef std::wstring_view   wstring_view;
+
+    test(string_view   ());
+    test(u16string_view());
+    test(u32string_view());
+    test(wstring_view  ());
+    test(string_view   ( "123"));
+    test(wstring_view  (L"123"));
+#if TEST_STD_VER >= 11
+    test(u16string_view{u"123"});
+    test(u32string_view{U"123"});
+#endif
+
+#if _LIBCPP_STD_VER > 11
+    {
+    constexpr string_view       sv { "123", 3 };
+    constexpr u16string_view u16sv {u"123", 3 };
+    constexpr u32string_view u32sv {U"123", 3 };
+    constexpr wstring_view     wsv {L"123", 3 };
+
+    static_assert (    sv.begin() !=    sv.end(), "" );
+    static_assert ( u16sv.begin() != u16sv.end(), "" );
+    static_assert ( u32sv.begin() != u32sv.end(), "" );
+    static_assert (   wsv.begin() !=   wsv.end(), "" );
+
+    static_assert (    sv.begin() !=    sv.cend(), "" );
+    static_assert ( u16sv.begin() != u16sv.cend(), "" );
+    static_assert ( u32sv.begin() != u32sv.cend(), "" );
+    static_assert (   wsv.begin() !=   wsv.cend(), "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.iterators/rbegin.pass.cpp

@@ -0,0 +1,61 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// const_iterator rbegin() const;
+
+#include <string_view>
+#include <cassert>
+
+#include "test_macros.h"
+
+template <class S>
+void
+test(S s)
+{
+    const S& cs = s;
+    typename S::reverse_iterator b = s.rbegin();
+    typename S::const_reverse_iterator cb1 = cs.rbegin();
+    typename S::const_reverse_iterator cb2 = s.crbegin();
+    if (!s.empty())
+    {
+        const size_t last = s.size() - 1;
+        assert(   *b ==  s[last]);
+        assert(  &*b == &s[last]);
+        assert( *cb1 ==  s[last]);
+        assert(&*cb1 == &s[last]);
+        assert( *cb2 ==  s[last]);
+        assert(&*cb2 == &s[last]);
+
+    }
+    assert(  b == cb1);
+    assert(  b == cb2);
+    assert(cb1 == cb2);
+}
+
+
+int main()
+{
+    typedef std::string_view    string_view;
+    typedef std::u16string_view u16string_view;
+    typedef std::u32string_view u32string_view;
+    typedef std::wstring_view   wstring_view;
+
+    test(string_view   ());
+    test(u16string_view());
+    test(u32string_view());
+    test(wstring_view  ());
+    test(string_view   ( "123"));
+    test(wstring_view  (L"123"));
+#if TEST_STD_VER >= 11
+    test(u16string_view{u"123"});
+    test(u32string_view{U"123"});
+#endif
+}

test/std/strings/string.view/string.view.iterators/rend.pass.cpp

@@ -0,0 +1,68 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr const_iterator rend() const;
+
+#include <string_view>
+#include <cassert>
+
+#include "test_macros.h"
+
+template <class S>
+void
+test(S s)
+{
+    const S& cs = s;
+    typename S::reverse_iterator e = s.rend();
+    typename S::const_reverse_iterator ce1 = cs.rend();
+    typename S::const_reverse_iterator ce2 = s.crend();
+
+    if (s.empty())
+    {
+        assert(  e ==  s.rbegin());
+        assert(ce1 == cs.rbegin());
+        assert(ce2 ==  s.rbegin());
+    }
+    else
+    {
+        assert(  e !=  s.rbegin());
+        assert(ce1 != cs.rbegin());
+        assert(ce2 !=  s.rbegin());
+    }
+
+    assert(  e -  s.rbegin() == s.size());
+    assert(ce1 - cs.rbegin() == cs.size());
+    assert(ce2 - s.crbegin() == s.size());
+
+    assert(  e == ce1);
+    assert(  e == ce2);
+    assert(ce1 == ce2);
+}
+
+
+int main()
+{
+    typedef std::string_view    string_view;
+    typedef std::u16string_view u16string_view;
+    typedef std::u32string_view u32string_view;
+    typedef std::wstring_view   wstring_view;
+
+    test(string_view   ());
+    test(u16string_view());
+    test(u32string_view());
+    test(wstring_view  ());
+    test(string_view   ( "123"));
+    test(wstring_view  (L"123"));
+#if TEST_STD_VER >= 11
+    test(u16string_view{u"123"});
+    test(u32string_view{U"123"});
+#endif
+}

test/std/strings/string.view/string.view.modifiers/clear.pass.cpp

@@ -0,0 +1,67 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// void clear() noexcept
+
+#include <string_view>
+#include <cassert>
+
+#include "test_macros.h"
+
+template<typename CharT>
+void test ( const CharT *s, size_t len ) {
+    typedef std::basic_string_view<CharT> SV;
+    {
+    SV sv1 ( s );
+    assert ( sv1.size() == len );
+    assert ( sv1.data() == s );
+
+    sv1.clear ();
+    assert ( sv1.data() == nullptr );
+    assert ( sv1.size() == 0 );
+    assert ( sv1 == SV());
+    }
+}
+
+#if _LIBCPP_STD_VER > 11
+constexpr size_t test_ce ( size_t n ) {
+    typedef std::basic_string_view<char> SV;
+    SV sv1{ "ABCDEFGHIJKL", n };
+    sv1.clear();
+    return sv1.size();
+}
+#endif
+
+int main () {
+    test ( "ABCDE", 5 );
+    test ( "a", 1 );
+    test ( "", 0 );
+
+    test ( L"ABCDE", 5 );
+    test ( L"a", 1 );
+    test ( L"", 0 );
+
+#if TEST_STD_VER >= 11
+    test ( u"ABCDE", 5 );
+    test ( u"a", 1 );
+    test ( u"", 0 );
+
+    test ( U"ABCDE", 5 );
+    test ( U"a", 1 );
+    test ( U"", 0 );
+#endif
+
+#if _LIBCPP_STD_VER > 11
+    static_assert ( test_ce (5) == 0, "" );
+#endif
+
+}

test/std/strings/string.view/string.view.modifiers/remove_prefix.pass.cpp

@@ -0,0 +1,78 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// void remove_prefix(size_type _n)
+
+#include <string_view>
+#include <cassert>
+#include <iostream>
+
+#include "test_macros.h"
+
+template<typename CharT>
+void test ( const CharT *s, size_t len ) {
+    typedef std::basic_string_view<CharT> SV;
+    {
+    SV sv1 ( s );
+    assert ( sv1.size() == len );
+    assert ( sv1.data() == s );
+
+    if ( len > 0 ) {
+        sv1.remove_prefix ( 1 );
+        assert ( sv1.size() == (len - 1));
+        assert ( sv1.data() == (s + 1));
+        sv1.remove_prefix ( len - 1 );
+    }
+
+    assert ( sv1.size() == 0 );
+    sv1.remove_prefix ( 0 );
+    assert ( sv1.size() == 0 );
+    }
+}
+
+#if _LIBCPP_STD_VER > 11
+constexpr size_t test_ce ( size_t n, size_t k ) {
+    typedef std::basic_string_view<char> SV;
+    SV sv1{ "ABCDEFGHIJKL", n };
+    sv1.remove_prefix ( k );
+    return sv1.size();
+}
+#endif
+
+int main () {
+    test ( "ABCDE", 5 );
+    test ( "a", 1 );
+    test ( "", 0 );
+
+    test ( L"ABCDE", 5 );
+    test ( L"a", 1 );
+    test ( L"", 0 );
+
+#if TEST_STD_VER >= 11
+    test ( u"ABCDE", 5 );
+    test ( u"a", 1 );
+    test ( u"", 0 );
+
+    test ( U"ABCDE", 5 );
+    test ( U"a", 1 );
+    test ( U"", 0 );
+#endif
+
+#if _LIBCPP_STD_VER > 11
+    {
+    static_assert ( test_ce ( 5, 0 ) == 5, "" );
+    static_assert ( test_ce ( 5, 1 ) == 4, "" );
+    static_assert ( test_ce ( 5, 5 ) == 0, "" );
+    static_assert ( test_ce ( 9, 3 ) == 6, "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.modifiers/remove_suffix.pass.cpp

@@ -0,0 +1,78 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// void remove_suffix(size_type _n)
+
+#include <string_view>
+#include <cassert>
+
+#include "test_macros.h"
+
+template<typename CharT>
+void test ( const CharT *s, size_t len ) {
+    typedef std::basic_string_view<CharT> SV;
+    {
+    SV sv1 ( s );
+    assert ( sv1.size() == len );
+    assert ( sv1.data() == s );
+
+    if ( len > 0 ) {
+        sv1.remove_suffix ( 1 );
+        assert ( sv1.size() == (len - 1));
+        assert ( sv1.data() == s);
+        sv1.remove_suffix ( len - 1 );
+        }
+
+    assert ( sv1.size() == 0 );
+    sv1.remove_suffix ( 0 );
+    assert ( sv1.size() == 0 );
+    }
+
+}
+
+#if _LIBCPP_STD_VER > 11
+constexpr size_t test_ce ( size_t n, size_t k ) {
+    typedef std::basic_string_view<char> SV;
+    SV sv1{ "ABCDEFGHIJKL", n };
+    sv1.remove_suffix ( k );
+    return sv1.size();
+}
+#endif
+
+int main () {
+    test ( "ABCDE", 5 );
+    test ( "a", 1 );
+    test ( "", 0 );
+
+    test ( L"ABCDE", 5 );
+    test ( L"a", 1 );
+    test ( L"", 0 );
+
+#if TEST_STD_VER >= 11
+    test ( u"ABCDE", 5 );
+    test ( u"a", 1 );
+    test ( u"", 0 );
+
+    test ( U"ABCDE", 5 );
+    test ( U"a", 1 );
+    test ( U"", 0 );
+#endif
+
+#if _LIBCPP_STD_VER > 11
+    {
+    static_assert ( test_ce ( 5, 0 ) == 5, "" );
+    static_assert ( test_ce ( 5, 1 ) == 4, "" );
+    static_assert ( test_ce ( 5, 5 ) == 0, "" );
+    static_assert ( test_ce ( 9, 3 ) == 6, "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.modifiers/swap.pass.cpp

@@ -0,0 +1,76 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+
+// void swap(basic_string_view& _other) noexcept
+
+#include <string_view>
+#include <cassert>
+
+#include "test_macros.h"
+
+template<typename CharT>
+void test ( const CharT *s, size_t len ) {
+    typedef std::basic_string_view<CharT> SV;
+    {
+    SV sv1(s);
+    SV sv2;
+
+    assert ( sv1.size() == len );
+    assert ( sv1.data() == s );
+    assert ( sv2.size() == 0 );
+
+    sv1.swap ( sv2 );
+    assert ( sv1.size() == 0 );
+    assert ( sv2.size() == len );
+    assert ( sv2.data() == s );
+    }
+
+}
+
+#if _LIBCPP_STD_VER > 11
+constexpr size_t test_ce ( size_t n, size_t k ) {
+    typedef std::basic_string_view<char> SV;
+    SV sv1{ "ABCDEFGHIJKL", n };
+    SV sv2 { sv1.data(), k };
+    sv1.swap ( sv2 );
+    return sv1.size();
+}
+#endif
+
+
+int main () {
+    test ( "ABCDE", 5 );
+    test ( "a", 1 );
+    test ( "", 0 );
+
+    test ( L"ABCDE", 5 );
+    test ( L"a", 1 );
+    test ( L"", 0 );
+
+#if TEST_STD_VER >= 11
+    test ( u"ABCDE", 5 );
+    test ( u"a", 1 );
+    test ( u"", 0 );
+
+    test ( U"ABCDE", 5 );
+    test ( U"a", 1 );
+    test ( U"", 0 );
+#endif
+
+#if _LIBCPP_STD_VER > 11
+    {
+    static_assert ( test_ce (2, 3) == 3, "" );
+    static_assert ( test_ce (5, 3) == 3, "" );
+    static_assert ( test_ce (0, 1) == 1, "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.nonmem/quoted.pass.cpp

@@ -0,0 +1,212 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <iomanip>
+
+// quoted
+
+#include <iomanip>
+#include <sstream>
+#include <string_view>
+#include <cassert>
+
+#if _LIBCPP_STD_VER > 11
+// quoted is C++14 only
+
+bool is_skipws ( const std::istream *is ) {
+    return ( is->flags() & std::ios_base::skipws ) != 0;
+    }
+
+
+bool is_skipws ( const std::wistream *is ) {
+    return ( is->flags() & std::ios_base::skipws ) != 0;
+    }
+
+void round_trip ( const char *p ) {
+    std::stringstream ss;
+    bool skippingws = is_skipws ( &ss );
+    std::string_view sv {p};
+
+    ss << std::quoted(sv);
+    std::string s;
+    ss >> std::quoted(s);
+    assert ( s == sv );
+    assert ( skippingws == is_skipws ( &ss ));
+    }
+
+void round_trip_ws ( const char *p ) {
+    std::stringstream ss;
+    std::noskipws ( ss );
+    bool skippingws = is_skipws ( &ss );
+    std::string_view sv {p};
+
+    ss << std::quoted(sv);
+    std::string s;
+    ss >> std::quoted(s);
+    assert ( s == sv );
+    assert ( skippingws == is_skipws ( &ss ));
+    }
+
+void round_trip_d ( const char *p, char delim ) {
+    std::stringstream ss;
+    std::string_view sv {p};
+
+    ss << std::quoted(sv, delim);
+    std::string s;
+    ss >> std::quoted(s, delim);
+    assert ( s == sv );
+    }
+
+void round_trip_e ( const char *p, char escape ) {
+    std::stringstream ss;
+    std::string_view sv {p};
+
+    ss << std::quoted(sv, '"', escape );
+    std::string s;
+    ss >> std::quoted(s, '"', escape );
+    assert ( s == sv );
+    }
+
+
+
+std::string quote ( const char *p, char delim='"', char escape='\\' ) {
+    std::stringstream ss;
+    ss << std::quoted(p, delim, escape);
+    std::string s;
+    ss >> s;    // no quote
+    return s;
+}
+
+std::string unquote ( const char *p, char delim='"', char escape='\\' ) {
+    std::stringstream ss;
+    ss << p;
+    std::string s;
+    ss >> std::quoted(s, delim, escape);
+    return s;
+}
+
+
+void round_trip ( const wchar_t *p ) {
+    std::wstringstream ss;
+    bool skippingws = is_skipws ( &ss );
+    std::wstring_view sv {p};
+
+    ss << std::quoted(sv);
+    std::wstring s;
+    ss >> std::quoted(s);
+    assert ( s == sv );
+    assert ( skippingws == is_skipws ( &ss ));
+    }
+
+
+void round_trip_ws ( const wchar_t *p ) {
+    std::wstringstream ss;
+    std::noskipws ( ss );
+    bool skippingws = is_skipws ( &ss );
+    std::wstring_view sv {p};
+
+    ss << std::quoted(sv);
+    std::wstring s;
+    ss >> std::quoted(s);
+    assert ( s == sv );
+    assert ( skippingws == is_skipws ( &ss ));
+    }
+
+void round_trip_d ( const wchar_t *p, wchar_t delim ) {
+    std::wstringstream ss;
+    std::wstring_view sv {p};
+
+    ss << std::quoted(sv, delim);
+    std::wstring s;
+    ss >> std::quoted(s, delim);
+    assert ( s == sv );
+    }
+
+void round_trip_e ( const wchar_t *p, wchar_t escape ) {
+    std::wstringstream ss;
+    std::wstring_view sv {p};
+
+    ss << std::quoted(sv, wchar_t('"'), escape );
+    std::wstring s;
+    ss >> std::quoted(s, wchar_t('"'), escape );
+    assert ( s == sv );
+    }
+
+
+std::wstring quote ( const wchar_t *p, wchar_t delim='"', wchar_t escape='\\' ) {
+    std::wstringstream ss;
+    std::wstring_view sv {p};
+
+    ss << std::quoted(sv, delim, escape);
+    std::wstring s;
+    ss >> s;    // no quote
+    return s;
+}
+
+std::wstring unquote ( const wchar_t *p, wchar_t delim='"', wchar_t escape='\\' ) {
+    std::wstringstream ss;
+    std::wstring_view sv {p};
+
+    ss << sv;
+    std::wstring s;
+    ss >> std::quoted(s, delim, escape);
+    return s;
+}
+
+int main()
+{
+    round_trip    (  "" );
+    round_trip_ws (  "" );
+    round_trip_d  (  "", 'q' );
+    round_trip_e  (  "", 'q' );
+
+    round_trip    ( L"" );
+    round_trip_ws ( L"" );
+    round_trip_d  ( L"", 'q' );
+    round_trip_e  ( L"", 'q' );
+
+    round_trip    (  "Hi" );
+    round_trip_ws (  "Hi" );
+    round_trip_d  (  "Hi", '!' );
+    round_trip_e  (  "Hi", '!' );
+    assert ( quote ( "Hi", '!' ) == "!Hi!" );
+    assert ( quote ( "Hi!", '!' ) == R"(!Hi\!!)" );
+
+    round_trip    ( L"Hi" );
+    round_trip_ws ( L"Hi" );
+    round_trip_d  ( L"Hi", '!' );
+    round_trip_e  ( L"Hi", '!' );
+    assert ( quote ( L"Hi", '!' )  == L"!Hi!" );
+    assert ( quote ( L"Hi!", '!' ) == LR"(!Hi\!!)" );
+
+    round_trip    (  "Hi Mom" );
+    round_trip_ws (  "Hi Mom" );
+    round_trip    ( L"Hi Mom" );
+    round_trip_ws ( L"Hi Mom" );
+
+    assert ( quote (  "" )  ==  "\"\"" );
+    assert ( quote ( L"" )  == L"\"\"" );
+    assert ( quote (  "a" ) ==  "\"a\"" );
+    assert ( quote ( L"a" ) == L"\"a\"" );
+
+//  missing end quote - must not hang
+    assert ( unquote (  "\"abc" ) ==  "abc" );
+    assert ( unquote ( L"\"abc" ) == L"abc" );
+
+    assert ( unquote (  "abc" ) == "abc" ); // no delimiter
+    assert ( unquote ( L"abc" ) == L"abc" ); // no delimiter
+    assert ( unquote (  "abc def" ) ==  "abc" ); // no delimiter
+    assert ( unquote ( L"abc def" ) == L"abc" ); // no delimiter
+
+    assert ( unquote (  "" ) ==  "" ); // nothing there
+    assert ( unquote ( L"" ) == L"" ); // nothing there
+    }
+#else
+int main() {}
+#endif

test/std/strings/string.view/string.view.ops/compare.pointer.pass.cpp

@@ -0,0 +1,126 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr int compare(const charT* s) const;
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+int sign ( int x ) { return x > 0 ? 1 : ( x < 0 ? -1 : 0 ); }
+
+template<typename CharT>
+void test1 ( std::basic_string_view<CharT> sv1, const CharT *s, int expected ) {
+    assert ( sign( sv1.compare(s)) == sign(expected));
+}
+
+template<typename CharT>
+void
+test( const CharT *s1, const CharT *s2, int expected)
+{
+    typedef std::basic_string_view<CharT> string_view_t;
+    string_view_t sv1 ( s1 );
+    test1 ( sv1, s2, expected );
+}
+
+int main()
+{
+    {
+    test("", "", 0);
+    test("", "abcde", -5);
+    test("", "abcdefghij", -10);
+    test("", "abcdefghijklmnopqrst", -20);
+    test("abcde", "", 5);
+    test("abcde", "abcde", 0);
+    test("abcde", "abcdefghij", -5);
+    test("abcde", "abcdefghijklmnopqrst", -15);
+    test("abcdefghij", "", 10);
+    test("abcdefghij", "abcde", 5);
+    test("abcdefghij", "abcdefghij", 0);
+    test("abcdefghij", "abcdefghijklmnopqrst", -10);
+    test("abcdefghijklmnopqrst", "", 20);
+    test("abcdefghijklmnopqrst", "abcde", 15);
+    test("abcdefghijklmnopqrst", "abcdefghij", 10);
+    test("abcdefghijklmnopqrst", "abcdefghijklmnopqrst", 0);
+    }
+
+    {
+    test(L"", L"", 0);
+    test(L"", L"abcde", -5);
+    test(L"", L"abcdefghij", -10);
+    test(L"", L"abcdefghijklmnopqrst", -20);
+    test(L"abcde", L"", 5);
+    test(L"abcde", L"abcde", 0);
+    test(L"abcde", L"abcdefghij", -5);
+    test(L"abcde", L"abcdefghijklmnopqrst", -15);
+    test(L"abcdefghij", L"", 10);
+    test(L"abcdefghij", L"abcde", 5);
+    test(L"abcdefghij", L"abcdefghij", 0);
+    test(L"abcdefghij", L"abcdefghijklmnopqrst", -10);
+    test(L"abcdefghijklmnopqrst", L"", 20);
+    test(L"abcdefghijklmnopqrst", L"abcde", 15);
+    test(L"abcdefghijklmnopqrst", L"abcdefghij", 10);
+    test(L"abcdefghijklmnopqrst", L"abcdefghijklmnopqrst", 0);
+    }
+
+#if TEST_STD_VER >= 11
+    {
+    test(U"", U"", 0);
+    test(U"", U"abcde", -5);
+    test(U"", U"abcdefghij", -10);
+    test(U"", U"abcdefghijklmnopqrst", -20);
+    test(U"abcde", U"", 5);
+    test(U"abcde", U"abcde", 0);
+    test(U"abcde", U"abcdefghij", -5);
+    test(U"abcde", U"abcdefghijklmnopqrst", -15);
+    test(U"abcdefghij", U"", 10);
+    test(U"abcdefghij", U"abcde", 5);
+    test(U"abcdefghij", U"abcdefghij", 0);
+    test(U"abcdefghij", U"abcdefghijklmnopqrst", -10);
+    test(U"abcdefghijklmnopqrst", U"", 20);
+    test(U"abcdefghijklmnopqrst", U"abcde", 15);
+    test(U"abcdefghijklmnopqrst", U"abcdefghij", 10);
+    test(U"abcdefghijklmnopqrst", U"abcdefghijklmnopqrst", 0);
+    }
+
+    {
+    test(u"", u"", 0);
+    test(u"", u"abcde", -5);
+    test(u"", u"abcdefghij", -10);
+    test(u"", u"abcdefghijklmnopqrst", -20);
+    test(u"abcde", u"", 5);
+    test(u"abcde", u"abcde", 0);
+    test(u"abcde", u"abcdefghij", -5);
+    test(u"abcde", u"abcdefghijklmnopqrst", -15);
+    test(u"abcdefghij", u"", 10);
+    test(u"abcdefghij", u"abcde", 5);
+    test(u"abcdefghij", u"abcdefghij", 0);
+    test(u"abcdefghij", u"abcdefghijklmnopqrst", -10);
+    test(u"abcdefghijklmnopqrst", u"", 20);
+    test(u"abcdefghijklmnopqrst", u"abcde", 15);
+    test(u"abcdefghijklmnopqrst", u"abcdefghij", 10);
+    test(u"abcdefghijklmnopqrst", u"abcdefghijklmnopqrst", 0);
+    }
+#endif
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+    static_assert ( sv1.compare("") == 0, "" );
+    static_assert ( sv1.compare("abcde") == -1, "" );
+    static_assert ( sv2.compare("") == 1, "" );
+    static_assert ( sv2.compare("abcde") == 0, "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.ops/compare.pointer_size.pass.cpp

@@ -0,0 +1,447 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr int compare(size_type pos1, size_type n1, const charT* s) const;
+
+#include <string_view>
+#include <cassert>
+
+#include "test_macros.h"
+#include "constexpr_char_traits.hpp"
+
+int sign ( int x ) { return x > 0 ? 1 : ( x < 0 ? -1 : 0 ); }
+
+template<typename CharT>
+void test1 ( std::basic_string_view<CharT> sv1,
+             size_t pos1, size_t n1, const CharT *s, int expected ) {
+    try {
+        assert(sign(sv1.compare(pos1, n1, s)) == sign(expected));
+        assert(pos1 <= sv1.size());
+    }
+    catch (const std::out_of_range&) {
+        assert(pos1 > sv1.size());
+    }
+}
+
+template<typename CharT>
+void
+test( const CharT *s1, size_t pos1, size_t n1, const CharT *s2, int expected)
+{
+    typedef std::basic_string_view<CharT> string_view_t;
+    string_view_t sv1 ( s1 );
+    test1 ( sv1, pos1, n1, s2, expected );
+}
+
+void test0()
+{
+    test("", 0, 0, "", 0);
+    test("", 0, 0, "abcde", -5);
+    test("", 0, 0, "abcdefghij", -10);
+    test("", 0, 0, "abcdefghijklmnopqrst", -20);
+    test("", 0, 1, "", 0);
+    test("", 0, 1, "abcde", -5);
+    test("", 0, 1, "abcdefghij", -10);
+    test("", 0, 1, "abcdefghijklmnopqrst", -20);
+    test("", 1, 0, "", 0);
+    test("", 1, 0, "abcde", 0);
+    test("", 1, 0, "abcdefghij", 0);
+    test("", 1, 0, "abcdefghijklmnopqrst", 0);
+    test("abcde", 0, 0, "", 0);
+    test("abcde", 0, 0, "abcde", -5);
+    test("abcde", 0, 0, "abcdefghij", -10);
+    test("abcde", 0, 0, "abcdefghijklmnopqrst", -20);
+    test("abcde", 0, 1, "", 1);
+    test("abcde", 0, 1, "abcde", -4);
+    test("abcde", 0, 1, "abcdefghij", -9);
+    test("abcde", 0, 1, "abcdefghijklmnopqrst", -19);
+    test("abcde", 0, 2, "", 2);
+    test("abcde", 0, 2, "abcde", -3);
+    test("abcde", 0, 2, "abcdefghij", -8);
+    test("abcde", 0, 2, "abcdefghijklmnopqrst", -18);
+    test("abcde", 0, 4, "", 4);
+    test("abcde", 0, 4, "abcde", -1);
+    test("abcde", 0, 4, "abcdefghij", -6);
+    test("abcde", 0, 4, "abcdefghijklmnopqrst", -16);
+    test("abcde", 0, 5, "", 5);
+    test("abcde", 0, 5, "abcde", 0);
+    test("abcde", 0, 5, "abcdefghij", -5);
+    test("abcde", 0, 5, "abcdefghijklmnopqrst", -15);
+    test("abcde", 0, 6, "", 5);
+    test("abcde", 0, 6, "abcde", 0);
+    test("abcde", 0, 6, "abcdefghij", -5);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", -15);
+    test("abcde", 1, 0, "", 0);
+    test("abcde", 1, 0, "abcde", -5);
+    test("abcde", 1, 0, "abcdefghij", -10);
+    test("abcde", 1, 0, "abcdefghijklmnopqrst", -20);
+    test("abcde", 1, 1, "", 1);
+    test("abcde", 1, 1, "abcde", 1);
+    test("abcde", 1, 1, "abcdefghij", 1);
+    test("abcde", 1, 1, "abcdefghijklmnopqrst", 1);
+    test("abcde", 1, 2, "", 2);
+    test("abcde", 1, 2, "abcde", 1);
+    test("abcde", 1, 2, "abcdefghij", 1);
+    test("abcde", 1, 2, "abcdefghijklmnopqrst", 1);
+    test("abcde", 1, 3, "", 3);
+    test("abcde", 1, 3, "abcde", 1);
+    test("abcde", 1, 3, "abcdefghij", 1);
+    test("abcde", 1, 3, "abcdefghijklmnopqrst", 1);
+    test("abcde", 1, 4, "", 4);
+    test("abcde", 1, 4, "abcde", 1);
+    test("abcde", 1, 4, "abcdefghij", 1);
+    test("abcde", 1, 4, "abcdefghijklmnopqrst", 1);
+    test("abcde", 1, 5, "", 4);
+    test("abcde", 1, 5, "abcde", 1);
+    test("abcde", 1, 5, "abcdefghij", 1);
+    test("abcde", 1, 5, "abcdefghijklmnopqrst", 1);
+    test("abcde", 2, 0, "", 0);
+    test("abcde", 2, 0, "abcde", -5);
+    test("abcde", 2, 0, "abcdefghij", -10);
+    test("abcde", 2, 0, "abcdefghijklmnopqrst", -20);
+    test("abcde", 2, 1, "", 1);
+    test("abcde", 2, 1, "abcde", 2);
+    test("abcde", 2, 1, "abcdefghij", 2);
+    test("abcde", 2, 1, "abcdefghijklmnopqrst", 2);
+    test("abcde", 2, 2, "", 2);
+    test("abcde", 2, 2, "abcde", 2);
+    test("abcde", 2, 2, "abcdefghij", 2);
+    test("abcde", 2, 2, "abcdefghijklmnopqrst", 2);
+    test("abcde", 2, 3, "", 3);
+    test("abcde", 2, 3, "abcde", 2);
+    test("abcde", 2, 3, "abcdefghij", 2);
+    test("abcde", 2, 3, "abcdefghijklmnopqrst", 2);
+    test("abcde", 2, 4, "", 3);
+    test("abcde", 2, 4, "abcde", 2);
+    test("abcde", 2, 4, "abcdefghij", 2);
+    test("abcde", 2, 4, "abcdefghijklmnopqrst", 2);
+    test("abcde", 4, 0, "", 0);
+    test("abcde", 4, 0, "abcde", -5);
+    test("abcde", 4, 0, "abcdefghij", -10);
+    test("abcde", 4, 0, "abcdefghijklmnopqrst", -20);
+    test("abcde", 4, 1, "", 1);
+    test("abcde", 4, 1, "abcde", 4);
+    test("abcde", 4, 1, "abcdefghij", 4);
+    test("abcde", 4, 1, "abcdefghijklmnopqrst", 4);
+    test("abcde", 4, 2, "", 1);
+    test("abcde", 4, 2, "abcde", 4);
+    test("abcde", 4, 2, "abcdefghij", 4);
+    test("abcde", 4, 2, "abcdefghijklmnopqrst", 4);
+    test("abcde", 5, 0, "", 0);
+    test("abcde", 5, 0, "abcde", -5);
+    test("abcde", 5, 0, "abcdefghij", -10);
+    test("abcde", 5, 0, "abcdefghijklmnopqrst", -20);
+    test("abcde", 5, 1, "", 0);
+    test("abcde", 5, 1, "abcde", -5);
+    test("abcde", 5, 1, "abcdefghij", -10);
+    test("abcde", 5, 1, "abcdefghijklmnopqrst", -20);
+}
+
+void test1()
+{
+    test("abcde", 6, 0, "", 0);
+    test("abcde", 6, 0, "abcde", 0);
+    test("abcde", 6, 0, "abcdefghij", 0);
+    test("abcde", 6, 0, "abcdefghijklmnopqrst", 0);
+    test("abcdefghij", 0, 0, "", 0);
+    test("abcdefghij", 0, 0, "abcde", -5);
+    test("abcdefghij", 0, 0, "abcdefghij", -10);
+    test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghij", 0, 1, "", 1);
+    test("abcdefghij", 0, 1, "abcde", -4);
+    test("abcdefghij", 0, 1, "abcdefghij", -9);
+    test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", -19);
+    test("abcdefghij", 0, 5, "", 5);
+    test("abcdefghij", 0, 5, "abcde", 0);
+    test("abcdefghij", 0, 5, "abcdefghij", -5);
+    test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", -15);
+    test("abcdefghij", 0, 9, "", 9);
+    test("abcdefghij", 0, 9, "abcde", 4);
+    test("abcdefghij", 0, 9, "abcdefghij", -1);
+    test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", -11);
+    test("abcdefghij", 0, 10, "", 10);
+    test("abcdefghij", 0, 10, "abcde", 5);
+    test("abcdefghij", 0, 10, "abcdefghij", 0);
+    test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", -10);
+    test("abcdefghij", 0, 11, "", 10);
+    test("abcdefghij", 0, 11, "abcde", 5);
+    test("abcdefghij", 0, 11, "abcdefghij", 0);
+    test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", -10);
+    test("abcdefghij", 1, 0, "", 0);
+    test("abcdefghij", 1, 0, "abcde", -5);
+    test("abcdefghij", 1, 0, "abcdefghij", -10);
+    test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghij", 1, 1, "", 1);
+    test("abcdefghij", 1, 1, "abcde", 1);
+    test("abcdefghij", 1, 1, "abcdefghij", 1);
+    test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 1);
+    test("abcdefghij", 1, 4, "", 4);
+    test("abcdefghij", 1, 4, "abcde", 1);
+    test("abcdefghij", 1, 4, "abcdefghij", 1);
+    test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 1);
+    test("abcdefghij", 1, 8, "", 8);
+    test("abcdefghij", 1, 8, "abcde", 1);
+    test("abcdefghij", 1, 8, "abcdefghij", 1);
+    test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 1);
+    test("abcdefghij", 1, 9, "", 9);
+    test("abcdefghij", 1, 9, "abcde", 1);
+    test("abcdefghij", 1, 9, "abcdefghij", 1);
+    test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 1);
+    test("abcdefghij", 1, 10, "", 9);
+    test("abcdefghij", 1, 10, "abcde", 1);
+    test("abcdefghij", 1, 10, "abcdefghij", 1);
+    test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 1);
+    test("abcdefghij", 5, 0, "", 0);
+    test("abcdefghij", 5, 0, "abcde", -5);
+    test("abcdefghij", 5, 0, "abcdefghij", -10);
+    test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghij", 5, 1, "", 1);
+    test("abcdefghij", 5, 1, "abcde", 5);
+    test("abcdefghij", 5, 1, "abcdefghij", 5);
+    test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 5);
+    test("abcdefghij", 5, 2, "", 2);
+    test("abcdefghij", 5, 2, "abcde", 5);
+    test("abcdefghij", 5, 2, "abcdefghij", 5);
+    test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 5);
+    test("abcdefghij", 5, 4, "", 4);
+    test("abcdefghij", 5, 4, "abcde", 5);
+    test("abcdefghij", 5, 4, "abcdefghij", 5);
+    test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 5);
+    test("abcdefghij", 5, 5, "", 5);
+    test("abcdefghij", 5, 5, "abcde", 5);
+    test("abcdefghij", 5, 5, "abcdefghij", 5);
+    test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 5);
+    test("abcdefghij", 5, 6, "", 5);
+    test("abcdefghij", 5, 6, "abcde", 5);
+    test("abcdefghij", 5, 6, "abcdefghij", 5);
+    test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 5);
+    test("abcdefghij", 9, 0, "", 0);
+    test("abcdefghij", 9, 0, "abcde", -5);
+    test("abcdefghij", 9, 0, "abcdefghij", -10);
+    test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghij", 9, 1, "", 1);
+    test("abcdefghij", 9, 1, "abcde", 9);
+    test("abcdefghij", 9, 1, "abcdefghij", 9);
+    test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 9);
+    test("abcdefghij", 9, 2, "", 1);
+    test("abcdefghij", 9, 2, "abcde", 9);
+    test("abcdefghij", 9, 2, "abcdefghij", 9);
+    test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 9);
+    test("abcdefghij", 10, 0, "", 0);
+    test("abcdefghij", 10, 0, "abcde", -5);
+    test("abcdefghij", 10, 0, "abcdefghij", -10);
+    test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghij", 10, 1, "", 0);
+    test("abcdefghij", 10, 1, "abcde", -5);
+    test("abcdefghij", 10, 1, "abcdefghij", -10);
+    test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", -20);
+    test("abcdefghij", 11, 0, "", 0);
+    test("abcdefghij", 11, 0, "abcde", 0);
+    test("abcdefghij", 11, 0, "abcdefghij", 0);
+    test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 0);
+}
+
+void test2()
+{
+    test("abcdefghijklmnopqrst", 0, 0, "", 0);
+    test("abcdefghijklmnopqrst", 0, 0, "abcde", -5);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", -10);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghijklmnopqrst", 0, 1, "", 1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcde", -4);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", -9);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", -19);
+    test("abcdefghijklmnopqrst", 0, 10, "", 10);
+    test("abcdefghijklmnopqrst", 0, 10, "abcde", 5);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 0);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", -10);
+    test("abcdefghijklmnopqrst", 0, 19, "", 19);
+    test("abcdefghijklmnopqrst", 0, 19, "abcde", 14);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 9);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", -1);
+    test("abcdefghijklmnopqrst", 0, 20, "", 20);
+    test("abcdefghijklmnopqrst", 0, 20, "abcde", 15);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 10);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 0);
+    test("abcdefghijklmnopqrst", 0, 21, "", 20);
+    test("abcdefghijklmnopqrst", 0, 21, "abcde", 15);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 10);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 0);
+    test("abcdefghijklmnopqrst", 1, 0, "", 0);
+    test("abcdefghijklmnopqrst", 1, 0, "abcde", -5);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", -10);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghijklmnopqrst", 1, 1, "", 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcde", 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 1);
+    test("abcdefghijklmnopqrst", 1, 9, "", 9);
+    test("abcdefghijklmnopqrst", 1, 9, "abcde", 1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 1);
+    test("abcdefghijklmnopqrst", 1, 18, "", 18);
+    test("abcdefghijklmnopqrst", 1, 18, "abcde", 1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 1);
+    test("abcdefghijklmnopqrst", 1, 19, "", 19);
+    test("abcdefghijklmnopqrst", 1, 19, "abcde", 1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 1);
+    test("abcdefghijklmnopqrst", 1, 20, "", 19);
+    test("abcdefghijklmnopqrst", 1, 20, "abcde", 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 1);
+    test("abcdefghijklmnopqrst", 10, 0, "", 0);
+    test("abcdefghijklmnopqrst", 10, 0, "abcde", -5);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", -10);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghijklmnopqrst", 10, 1, "", 1);
+    test("abcdefghijklmnopqrst", 10, 1, "abcde", 10);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 10);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 10);
+    test("abcdefghijklmnopqrst", 10, 5, "", 5);
+    test("abcdefghijklmnopqrst", 10, 5, "abcde", 10);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 10);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 10);
+    test("abcdefghijklmnopqrst", 10, 9, "", 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcde", 10);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 10);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 10);
+    test("abcdefghijklmnopqrst", 10, 10, "", 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcde", 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 10);
+    test("abcdefghijklmnopqrst", 10, 11, "", 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcde", 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 10);
+    test("abcdefghijklmnopqrst", 19, 0, "", 0);
+    test("abcdefghijklmnopqrst", 19, 0, "abcde", -5);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", -10);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghijklmnopqrst", 19, 1, "", 1);
+    test("abcdefghijklmnopqrst", 19, 1, "abcde", 19);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 19);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 19);
+    test("abcdefghijklmnopqrst", 19, 2, "", 1);
+    test("abcdefghijklmnopqrst", 19, 2, "abcde", 19);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 19);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 19);
+    test("abcdefghijklmnopqrst", 20, 0, "", 0);
+    test("abcdefghijklmnopqrst", 20, 0, "abcde", -5);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", -10);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghijklmnopqrst", 20, 1, "", 0);
+    test("abcdefghijklmnopqrst", 20, 1, "abcde", -5);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", -10);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", -20);
+    test("abcdefghijklmnopqrst", 21, 0, "", 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcde", 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 0);
+}
+
+
+int main()
+{
+    test0();
+    test1();
+    test2();
+
+    {
+    test("", 0, 0, "", 0);
+    test("", 0, 0, "abcde", -5);
+    test("", 0, 0, "abcdefghij", -10);
+    test("", 0, 0, "abcdefghijklmnopqrst", -20);
+    test("abcde", 0, 2, "", 5);
+    test("abcde", 0, 6,"abcde", 0);
+    test("abcde", 0, 6, "abcdefghij", -5);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", -15);
+    test("abcdefghij", 3, 3, "", 10);
+    test("abcdefghij", 3, 3,"abcde", 5);
+    test("abcdefghij", 3, 3, "def", 0);
+    test("abcdefghij", 0, 4, "abcdefghijklmnopqrst", -10);
+    test("abcdefghijklmnopqrst", 5, 5, "", 20);
+    test("abcdefghijklmnopqrst", 0, 8, "abcde", 15);
+    test("abcdefghijklmnopqrst", 0, 12, "abcdefghij", 10);
+    test("abcdefghijklmnopqrst", 0, -1, "abcdefghijklmnopqrst", 0);
+    }
+
+    {
+    test(L"", 0, 0, L"", 0);
+    test(L"", 0, 0, L"abcde", -5);
+    test(L"", 0, 0, L"abcdefghij", -10);
+    test(L"", 0, 0, L"abcdefghijklmnopqrst", -20);
+    test(L"abcde", 0, 2, L"", 5);
+    test(L"abcde", 0, 6, L"abcde", 0);
+    test(L"abcde", 0, 6, L"abcdefghij", -5);
+    test(L"abcde", 0, 6, L"abcdefghijklmnopqrst", -15);
+    test(L"abcdefghij", 3, 3, L"", 10);
+    test(L"abcdefghij", 3, 3, L"abcde", 5);
+    test(L"abcdefghij", 3, 3, L"def", 0);
+    test(L"abcdefghij", 0, 4, L"abcdefghijklmnopqrst", -10);
+    test(L"abcdefghijklmnopqrst", 5, 5, L"", 20);
+    test(L"abcdefghijklmnopqrst", 0, 8, L"abcde", 15);
+    test(L"abcdefghijklmnopqrst", 0, 12, L"abcdefghij", 10);
+    test(L"abcdefghijklmnopqrst", 0, -1, L"abcdefghijklmnopqrst", 0);
+    }
+
+#if TEST_STD_VER >= 11
+    {
+    test(U"", 0, 0, U"", 0);
+    test(U"", 0, 0, U"abcde", -5);
+    test(U"", 0, 0, U"abcdefghij", -10);
+    test(U"", 0, 0, U"abcdefghijklmnopqrst", -20);
+    test(U"abcde", 0, 2, U"", 5);
+    test(U"abcde", 0, 6, U"abcde", 0);
+    test(U"abcde", 0, 6, U"abcdefghij", -5);
+    test(U"abcde", 0, 6, U"abcdefghijklmnopqrst", -15);
+    test(U"abcdefghij", 3, 3, U"", 10);
+    test(U"abcdefghij", 3, 3, U"abcde", 5);
+    test(U"abcdefghij", 3, 3, U"def", 0);
+    test(U"abcdefghij", 0, 4, U"abcdefghijklmnopqrst", -10);
+    test(U"abcdefghijklmnopqrst", 5, 5, U"", 20);
+    test(U"abcdefghijklmnopqrst", 0, 8, U"abcde", 15);
+    test(U"abcdefghijklmnopqrst", 0, 12, U"abcdefghij", 10);
+    test(U"abcdefghijklmnopqrst", 0, -1, U"abcdefghijklmnopqrst", 0);
+    }
+
+    {
+    test(u"", 0, 0, u"", 0);
+    test(u"", 0, 0, u"abcde", -5);
+    test(u"", 0, 0, u"abcdefghij", -10);
+    test(u"", 0, 0, u"abcdefghijklmnopqrst", -20);
+    test(u"abcde", 0, 2, u"", 5);
+    test(u"abcde", 0, 6, u"abcde", 0);
+    test(u"abcde", 0, 6, u"abcdefghij", -5);
+    test(u"abcde", 0, 6, u"abcdefghijklmnopqrst", -15);
+    test(u"abcdefghij", 3, 3, u"", 10);
+    test(u"abcdefghij", 3, 3, u"abcde", 5);
+    test(u"abcdefghij", 3, 3, u"def", 0);
+    test(u"abcdefghij", 0, 4, u"abcdefghijklmnopqrst", -10);
+    test(u"abcdefghijklmnopqrst", 5, 5, u"", 20);
+    test(u"abcdefghijklmnopqrst", 0, 8, u"abcde", 15);
+    test(u"abcdefghijklmnopqrst", 0, 12, u"abcdefghij", 10);
+    test(u"abcdefghijklmnopqrst", 0, -1, u"abcdefghijklmnopqrst", 0);
+    }
+#endif
+
+#if TEST_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcde", 5 };
+    static_assert ( sv1.compare(0, 0, "") == 0, "" );
+    static_assert ( sv1.compare(0, 0, "abcde") == -1, "" );
+    static_assert ( sv2.compare(0, 2, "") == 1, "" );
+    static_assert ( sv2.compare(0, 6, "abcde") == 0, "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.ops/compare.size_size_sv.pass.cpp

@@ -0,0 +1,396 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr int compare(size_type pos1, size_type n1, basic_string_view str) const;
+
+#include <string_view>
+#include <cassert>
+
+#include "test_macros.h"
+#include "constexpr_char_traits.hpp"
+
+int sign ( int x ) { return x > 0 ? 1 : ( x < 0 ? -1 : 0 ); }
+
+template<typename CharT>
+void test1 ( std::basic_string_view<CharT> sv1, size_t pos1, size_t n1,
+            std::basic_string_view<CharT> sv2, int expected ) {
+    try {
+        assert(sign( sv1.compare(pos1, n1, sv2)) == sign(expected));
+        assert(pos1 <= sv1.size());
+    }
+    catch (const std::out_of_range&) {
+        assert(pos1 > sv1.size());
+    }
+}
+
+
+template<typename CharT>
+void test ( const CharT *s1, size_t pos1, size_t n1, const CharT  *s2, int expected ) {
+    typedef std::basic_string_view<CharT> string_view_t;
+    string_view_t sv1 ( s1 );
+    string_view_t sv2 ( s2 );
+    test1(sv1, pos1, n1, sv2, expected);
+}
+
+void test0()
+{
+    test("", 0, 0, "", 0);
+    test("", 0, 0, "abcde", -5);
+    test("", 0, 0, "abcdefghij", -10);
+    test("", 0, 0, "abcdefghijklmnopqrst", -20);
+    test("", 0, 1, "", 0);
+    test("", 0, 1, "abcde", -5);
+    test("", 0, 1, "abcdefghij", -10);
+    test("", 0, 1, "abcdefghijklmnopqrst", -20);
+    test("", 1, 0, "", 0);
+    test("", 1, 0, "abcde", 0);
+    test("", 1, 0, "abcdefghij", 0);
+    test("", 1, 0, "abcdefghijklmnopqrst", 0);
+    test("abcde", 0, 0, "", 0);
+    test("abcde", 0, 0, "abcde", -5);
+    test("abcde", 0, 0, "abcdefghij", -10);
+    test("abcde", 0, 0, "abcdefghijklmnopqrst", -20);
+    test("abcde", 0, 1, "", 1);
+    test("abcde", 0, 1, "abcde", -4);
+    test("abcde", 0, 1, "abcdefghij", -9);
+    test("abcde", 0, 1, "abcdefghijklmnopqrst", -19);
+    test("abcde", 0, 2, "", 2);
+    test("abcde", 0, 2, "abcde", -3);
+    test("abcde", 0, 2, "abcdefghij", -8);
+    test("abcde", 0, 2, "abcdefghijklmnopqrst", -18);
+    test("abcde", 0, 4, "", 4);
+    test("abcde", 0, 4, "abcde", -1);
+    test("abcde", 0, 4, "abcdefghij", -6);
+    test("abcde", 0, 4, "abcdefghijklmnopqrst", -16);
+    test("abcde", 0, 5, "", 5);
+    test("abcde", 0, 5, "abcde", 0);
+    test("abcde", 0, 5, "abcdefghij", -5);
+    test("abcde", 0, 5, "abcdefghijklmnopqrst", -15);
+    test("abcde", 0, 6, "", 5);
+    test("abcde", 0, 6, "abcde", 0);
+    test("abcde", 0, 6, "abcdefghij", -5);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", -15);
+    test("abcde", 1, 0, "", 0);
+    test("abcde", 1, 0, "abcde", -5);
+    test("abcde", 1, 0, "abcdefghij", -10);
+    test("abcde", 1, 0, "abcdefghijklmnopqrst", -20);
+    test("abcde", 1, 1, "", 1);
+    test("abcde", 1, 1, "abcde", 1);
+    test("abcde", 1, 1, "abcdefghij", 1);
+    test("abcde", 1, 1, "abcdefghijklmnopqrst", 1);
+    test("abcde", 1, 2, "", 2);
+    test("abcde", 1, 2, "abcde", 1);
+    test("abcde", 1, 2, "abcdefghij", 1);
+    test("abcde", 1, 2, "abcdefghijklmnopqrst", 1);
+    test("abcde", 1, 3, "", 3);
+    test("abcde", 1, 3, "abcde", 1);
+    test("abcde", 1, 3, "abcdefghij", 1);
+    test("abcde", 1, 3, "abcdefghijklmnopqrst", 1);
+    test("abcde", 1, 4, "", 4);
+    test("abcde", 1, 4, "abcde", 1);
+    test("abcde", 1, 4, "abcdefghij", 1);
+    test("abcde", 1, 4, "abcdefghijklmnopqrst", 1);
+    test("abcde", 1, 5, "", 4);
+    test("abcde", 1, 5, "abcde", 1);
+    test("abcde", 1, 5, "abcdefghij", 1);
+    test("abcde", 1, 5, "abcdefghijklmnopqrst", 1);
+    test("abcde", 2, 0, "", 0);
+    test("abcde", 2, 0, "abcde", -5);
+    test("abcde", 2, 0, "abcdefghij", -10);
+    test("abcde", 2, 0, "abcdefghijklmnopqrst", -20);
+    test("abcde", 2, 1, "", 1);
+    test("abcde", 2, 1, "abcde", 2);
+    test("abcde", 2, 1, "abcdefghij", 2);
+    test("abcde", 2, 1, "abcdefghijklmnopqrst", 2);
+    test("abcde", 2, 2, "", 2);
+    test("abcde", 2, 2, "abcde", 2);
+    test("abcde", 2, 2, "abcdefghij", 2);
+    test("abcde", 2, 2, "abcdefghijklmnopqrst", 2);
+    test("abcde", 2, 3, "", 3);
+    test("abcde", 2, 3, "abcde", 2);
+    test("abcde", 2, 3, "abcdefghij", 2);
+    test("abcde", 2, 3, "abcdefghijklmnopqrst", 2);
+    test("abcde", 2, 4, "", 3);
+    test("abcde", 2, 4, "abcde", 2);
+    test("abcde", 2, 4, "abcdefghij", 2);
+    test("abcde", 2, 4, "abcdefghijklmnopqrst", 2);
+    test("abcde", 4, 0, "", 0);
+    test("abcde", 4, 0, "abcde", -5);
+    test("abcde", 4, 0, "abcdefghij", -10);
+    test("abcde", 4, 0, "abcdefghijklmnopqrst", -20);
+    test("abcde", 4, 1, "", 1);
+    test("abcde", 4, 1, "abcde", 4);
+    test("abcde", 4, 1, "abcdefghij", 4);
+    test("abcde", 4, 1, "abcdefghijklmnopqrst", 4);
+    test("abcde", 4, 2, "", 1);
+    test("abcde", 4, 2, "abcde", 4);
+    test("abcde", 4, 2, "abcdefghij", 4);
+    test("abcde", 4, 2, "abcdefghijklmnopqrst", 4);
+    test("abcde", 5, 0, "", 0);
+    test("abcde", 5, 0, "abcde", -5);
+    test("abcde", 5, 0, "abcdefghij", -10);
+    test("abcde", 5, 0, "abcdefghijklmnopqrst", -20);
+    test("abcde", 5, 1, "", 0);
+    test("abcde", 5, 1, "abcde", -5);
+    test("abcde", 5, 1, "abcdefghij", -10);
+    test("abcde", 5, 1, "abcdefghijklmnopqrst", -20);
+}
+
+void test1()
+{
+    test("abcde", 6, 0, "", 0);
+    test("abcde", 6, 0, "abcde", 0);
+    test("abcde", 6, 0, "abcdefghij", 0);
+    test("abcde", 6, 0, "abcdefghijklmnopqrst", 0);
+    test("abcdefghij", 0, 0, "", 0);
+    test("abcdefghij", 0, 0, "abcde", -5);
+    test("abcdefghij", 0, 0, "abcdefghij", -10);
+    test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghij", 0, 1, "", 1);
+    test("abcdefghij", 0, 1, "abcde", -4);
+    test("abcdefghij", 0, 1, "abcdefghij", -9);
+    test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", -19);
+    test("abcdefghij", 0, 5, "", 5);
+    test("abcdefghij", 0, 5, "abcde", 0);
+    test("abcdefghij", 0, 5, "abcdefghij", -5);
+    test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", -15);
+    test("abcdefghij", 0, 9, "", 9);
+    test("abcdefghij", 0, 9, "abcde", 4);
+    test("abcdefghij", 0, 9, "abcdefghij", -1);
+    test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", -11);
+    test("abcdefghij", 0, 10, "", 10);
+    test("abcdefghij", 0, 10, "abcde", 5);
+    test("abcdefghij", 0, 10, "abcdefghij", 0);
+    test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", -10);
+    test("abcdefghij", 0, 11, "", 10);
+    test("abcdefghij", 0, 11, "abcde", 5);
+    test("abcdefghij", 0, 11, "abcdefghij", 0);
+    test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", -10);
+    test("abcdefghij", 1, 0, "", 0);
+    test("abcdefghij", 1, 0, "abcde", -5);
+    test("abcdefghij", 1, 0, "abcdefghij", -10);
+    test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghij", 1, 1, "", 1);
+    test("abcdefghij", 1, 1, "abcde", 1);
+    test("abcdefghij", 1, 1, "abcdefghij", 1);
+    test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 1);
+    test("abcdefghij", 1, 4, "", 4);
+    test("abcdefghij", 1, 4, "abcde", 1);
+    test("abcdefghij", 1, 4, "abcdefghij", 1);
+    test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 1);
+    test("abcdefghij", 1, 8, "", 8);
+    test("abcdefghij", 1, 8, "abcde", 1);
+    test("abcdefghij", 1, 8, "abcdefghij", 1);
+    test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 1);
+    test("abcdefghij", 1, 9, "", 9);
+    test("abcdefghij", 1, 9, "abcde", 1);
+    test("abcdefghij", 1, 9, "abcdefghij", 1);
+    test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 1);
+    test("abcdefghij", 1, 10, "", 9);
+    test("abcdefghij", 1, 10, "abcde", 1);
+    test("abcdefghij", 1, 10, "abcdefghij", 1);
+    test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 1);
+    test("abcdefghij", 5, 0, "", 0);
+    test("abcdefghij", 5, 0, "abcde", -5);
+    test("abcdefghij", 5, 0, "abcdefghij", -10);
+    test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghij", 5, 1, "", 1);
+    test("abcdefghij", 5, 1, "abcde", 5);
+    test("abcdefghij", 5, 1, "abcdefghij", 5);
+    test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 5);
+    test("abcdefghij", 5, 2, "", 2);
+    test("abcdefghij", 5, 2, "abcde", 5);
+    test("abcdefghij", 5, 2, "abcdefghij", 5);
+    test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 5);
+    test("abcdefghij", 5, 4, "", 4);
+    test("abcdefghij", 5, 4, "abcde", 5);
+    test("abcdefghij", 5, 4, "abcdefghij", 5);
+    test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 5);
+    test("abcdefghij", 5, 5, "", 5);
+    test("abcdefghij", 5, 5, "abcde", 5);
+    test("abcdefghij", 5, 5, "abcdefghij", 5);
+    test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 5);
+    test("abcdefghij", 5, 6, "", 5);
+    test("abcdefghij", 5, 6, "abcde", 5);
+    test("abcdefghij", 5, 6, "abcdefghij", 5);
+    test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 5);
+    test("abcdefghij", 9, 0, "", 0);
+    test("abcdefghij", 9, 0, "abcde", -5);
+    test("abcdefghij", 9, 0, "abcdefghij", -10);
+    test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghij", 9, 1, "", 1);
+    test("abcdefghij", 9, 1, "abcde", 9);
+    test("abcdefghij", 9, 1, "abcdefghij", 9);
+    test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 9);
+    test("abcdefghij", 9, 2, "", 1);
+    test("abcdefghij", 9, 2, "abcde", 9);
+    test("abcdefghij", 9, 2, "abcdefghij", 9);
+    test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 9);
+    test("abcdefghij", 10, 0, "", 0);
+    test("abcdefghij", 10, 0, "abcde", -5);
+    test("abcdefghij", 10, 0, "abcdefghij", -10);
+    test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghij", 10, 1, "", 0);
+    test("abcdefghij", 10, 1, "abcde", -5);
+    test("abcdefghij", 10, 1, "abcdefghij", -10);
+    test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", -20);
+    test("abcdefghij", 11, 0, "", 0);
+    test("abcdefghij", 11, 0, "abcde", 0);
+    test("abcdefghij", 11, 0, "abcdefghij", 0);
+    test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 0);
+}
+
+void test2()
+{
+    test("abcdefghijklmnopqrst", 0, 0, "", 0);
+    test("abcdefghijklmnopqrst", 0, 0, "abcde", -5);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", -10);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghijklmnopqrst", 0, 1, "", 1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcde", -4);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", -9);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", -19);
+    test("abcdefghijklmnopqrst", 0, 10, "", 10);
+    test("abcdefghijklmnopqrst", 0, 10, "abcde", 5);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 0);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", -10);
+    test("abcdefghijklmnopqrst", 0, 19, "", 19);
+    test("abcdefghijklmnopqrst", 0, 19, "abcde", 14);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 9);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", -1);
+    test("abcdefghijklmnopqrst", 0, 20, "", 20);
+    test("abcdefghijklmnopqrst", 0, 20, "abcde", 15);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 10);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 0);
+    test("abcdefghijklmnopqrst", 0, 21, "", 20);
+    test("abcdefghijklmnopqrst", 0, 21, "abcde", 15);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 10);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 0);
+    test("abcdefghijklmnopqrst", 1, 0, "", 0);
+    test("abcdefghijklmnopqrst", 1, 0, "abcde", -5);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", -10);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghijklmnopqrst", 1, 1, "", 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcde", 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 1);
+    test("abcdefghijklmnopqrst", 1, 9, "", 9);
+    test("abcdefghijklmnopqrst", 1, 9, "abcde", 1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 1);
+    test("abcdefghijklmnopqrst", 1, 18, "", 18);
+    test("abcdefghijklmnopqrst", 1, 18, "abcde", 1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 1);
+    test("abcdefghijklmnopqrst", 1, 19, "", 19);
+    test("abcdefghijklmnopqrst", 1, 19, "abcde", 1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 1);
+    test("abcdefghijklmnopqrst", 1, 20, "", 19);
+    test("abcdefghijklmnopqrst", 1, 20, "abcde", 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 1);
+    test("abcdefghijklmnopqrst", 10, 0, "", 0);
+    test("abcdefghijklmnopqrst", 10, 0, "abcde", -5);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", -10);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghijklmnopqrst", 10, 1, "", 1);
+    test("abcdefghijklmnopqrst", 10, 1, "abcde", 10);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 10);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 10);
+    test("abcdefghijklmnopqrst", 10, 5, "", 5);
+    test("abcdefghijklmnopqrst", 10, 5, "abcde", 10);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 10);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 10);
+    test("abcdefghijklmnopqrst", 10, 9, "", 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcde", 10);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 10);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 10);
+    test("abcdefghijklmnopqrst", 10, 10, "", 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcde", 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 10);
+    test("abcdefghijklmnopqrst", 10, 11, "", 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcde", 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 10);
+    test("abcdefghijklmnopqrst", 19, 0, "", 0);
+    test("abcdefghijklmnopqrst", 19, 0, "abcde", -5);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", -10);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghijklmnopqrst", 19, 1, "", 1);
+    test("abcdefghijklmnopqrst", 19, 1, "abcde", 19);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 19);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 19);
+    test("abcdefghijklmnopqrst", 19, 2, "", 1);
+    test("abcdefghijklmnopqrst", 19, 2, "abcde", 19);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 19);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 19);
+    test("abcdefghijklmnopqrst", 20, 0, "", 0);
+    test("abcdefghijklmnopqrst", 20, 0, "abcde", -5);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", -10);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", -20);
+    test("abcdefghijklmnopqrst", 20, 1, "", 0);
+    test("abcdefghijklmnopqrst", 20, 1, "abcde", -5);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", -10);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", -20);
+    test("abcdefghijklmnopqrst", 21, 0, "", 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcde", 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 0);
+}
+
+
+int main () {
+    test0();
+    test1();
+    test2();
+
+    {
+    test("abcde", 5, 1, "", 0);
+    test("abcde", 2, 4, "", 3);
+    test("abcde", 2, 4, "abcde", 2);
+    test("ABCde", 2, 4, "abcde", -1);
+    }
+
+    {
+    test(L"abcde", 5, 1, L"", 0);
+    test(L"abcde", 2, 4, L"", 3);
+    test(L"abcde", 2, 4, L"abcde", 2);
+    test(L"ABCde", 2, 4, L"abcde", -1);
+    }
+
+#if TEST_STD_VER >= 11
+    {
+    test(u"abcde", 5, 1, u"", 0);
+    test(u"abcde", 2, 4, u"", 3);
+    test(u"abcde", 2, 4, u"abcde", 2);
+    test(u"ABCde", 2, 4, u"abcde", -1);
+    }
+
+    {
+    test(U"abcde", 5, 1, U"", 0);
+    test(U"abcde", 2, 4, U"", 3);
+    test(U"abcde", 2, 4, U"abcde", 2);
+    test(U"ABCde", 2, 4, U"abcde", -1);
+    }
+#endif
+
+#if TEST_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1 { "abcde", 5 };
+    constexpr SV  sv2 { "abcde", 0 };
+    static_assert ( sv1.compare(5, 1, sv2) == 0, "" );
+    static_assert ( sv1.compare(2, 4, sv2) == 1, "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.ops/compare.size_size_sv_pointer_size.pass.cpp

@@ -0,0 +1,1347 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr int compare(size_type pos1, size_type n1,
+//             const charT* s, size_type n2) const;
+
+#include <string_view>
+#include <cassert>
+
+#include "test_macros.h"
+#include "constexpr_char_traits.hpp"
+
+int sign ( int x ) { return x > 0 ? 1 : ( x < 0 ? -1 : 0 ); }
+
+template<typename CharT>
+void test1 ( std::basic_string_view<CharT> sv1, size_t pos1, size_t n1,
+             const CharT *s2, size_t n2, int expected ) {
+    try {
+        assert(sign(sv1.compare(pos1, n1, s2, n2)) == sign(expected));
+        assert(pos1 <= sv1.size());
+        }
+    catch (const std::out_of_range&) {
+        assert(pos1 > sv1.size());
+        }
+}
+
+
+template<typename CharT>
+void test ( const CharT *s1, size_t pos1, size_t n1,
+            const CharT *s2, size_t n2,
+            int expected ) {
+    typedef std::basic_string_view<CharT> string_view_t;
+    string_view_t sv1 ( s1 );
+    test1 (sv1, pos1, n1, s2, n2, expected);
+}
+
+
+void test0()
+{
+    test("", 0, 0, "", 0, 0);
+    test("", 0, 0, "abcde", 0, 0);
+    test("", 0, 0, "abcde", 1, -1);
+    test("", 0, 0, "abcde", 2, -2);
+    test("", 0, 0, "abcde", 4, -4);
+    test("", 0, 0, "abcde", 5, -5);
+    test("", 0, 0, "abcdefghij", 0, 0);
+    test("", 0, 0, "abcdefghij", 1, -1);
+    test("", 0, 0, "abcdefghij", 5, -5);
+    test("", 0, 0, "abcdefghij", 9, -9);
+    test("", 0, 0, "abcdefghij", 10, -10);
+    test("", 0, 0, "abcdefghijklmnopqrst", 0, 0);
+    test("", 0, 0, "abcdefghijklmnopqrst", 1, -1);
+    test("", 0, 0, "abcdefghijklmnopqrst", 10, -10);
+    test("", 0, 0, "abcdefghijklmnopqrst", 19, -19);
+    test("", 0, 0, "abcdefghijklmnopqrst", 20, -20);
+    test("", 0, 1, "", 0, 0);
+    test("", 0, 1, "abcde", 0, 0);
+    test("", 0, 1, "abcde", 1, -1);
+    test("", 0, 1, "abcde", 2, -2);
+    test("", 0, 1, "abcde", 4, -4);
+    test("", 0, 1, "abcde", 5, -5);
+    test("", 0, 1, "abcdefghij", 0, 0);
+    test("", 0, 1, "abcdefghij", 1, -1);
+    test("", 0, 1, "abcdefghij", 5, -5);
+    test("", 0, 1, "abcdefghij", 9, -9);
+    test("", 0, 1, "abcdefghij", 10, -10);
+    test("", 0, 1, "abcdefghijklmnopqrst", 0, 0);
+    test("", 0, 1, "abcdefghijklmnopqrst", 1, -1);
+    test("", 0, 1, "abcdefghijklmnopqrst", 10, -10);
+    test("", 0, 1, "abcdefghijklmnopqrst", 19, -19);
+    test("", 0, 1, "abcdefghijklmnopqrst", 20, -20);
+    test("", 1, 0, "", 0, 0);
+    test("", 1, 0, "abcde", 0, 0);
+    test("", 1, 0, "abcde", 1, 0);
+    test("", 1, 0, "abcde", 2, 0);
+    test("", 1, 0, "abcde", 4, 0);
+    test("", 1, 0, "abcde", 5, 0);
+    test("", 1, 0, "abcdefghij", 0, 0);
+    test("", 1, 0, "abcdefghij", 1, 0);
+    test("", 1, 0, "abcdefghij", 5, 0);
+    test("", 1, 0, "abcdefghij", 9, 0);
+    test("", 1, 0, "abcdefghij", 10, 0);
+    test("", 1, 0, "abcdefghijklmnopqrst", 0, 0);
+    test("", 1, 0, "abcdefghijklmnopqrst", 1, 0);
+    test("", 1, 0, "abcdefghijklmnopqrst", 10, 0);
+    test("", 1, 0, "abcdefghijklmnopqrst", 19, 0);
+    test("", 1, 0, "abcdefghijklmnopqrst", 20, 0);
+    test("abcde", 0, 0, "", 0, 0);
+    test("abcde", 0, 0, "abcde", 0, 0);
+    test("abcde", 0, 0, "abcde", 1, -1);
+    test("abcde", 0, 0, "abcde", 2, -2);
+    test("abcde", 0, 0, "abcde", 4, -4);
+    test("abcde", 0, 0, "abcde", 5, -5);
+    test("abcde", 0, 0, "abcdefghij", 0, 0);
+    test("abcde", 0, 0, "abcdefghij", 1, -1);
+    test("abcde", 0, 0, "abcdefghij", 5, -5);
+    test("abcde", 0, 0, "abcdefghij", 9, -9);
+    test("abcde", 0, 0, "abcdefghij", 10, -10);
+    test("abcde", 0, 0, "abcdefghijklmnopqrst", 0, 0);
+    test("abcde", 0, 0, "abcdefghijklmnopqrst", 1, -1);
+    test("abcde", 0, 0, "abcdefghijklmnopqrst", 10, -10);
+    test("abcde", 0, 0, "abcdefghijklmnopqrst", 19, -19);
+    test("abcde", 0, 0, "abcdefghijklmnopqrst", 20, -20);
+    test("abcde", 0, 1, "", 0, 1);
+    test("abcde", 0, 1, "abcde", 0, 1);
+    test("abcde", 0, 1, "abcde", 1, 0);
+    test("abcde", 0, 1, "abcde", 2, -1);
+    test("abcde", 0, 1, "abcde", 4, -3);
+    test("abcde", 0, 1, "abcde", 5, -4);
+    test("abcde", 0, 1, "abcdefghij", 0, 1);
+    test("abcde", 0, 1, "abcdefghij", 1, 0);
+    test("abcde", 0, 1, "abcdefghij", 5, -4);
+    test("abcde", 0, 1, "abcdefghij", 9, -8);
+    test("abcde", 0, 1, "abcdefghij", 10, -9);
+    test("abcde", 0, 1, "abcdefghijklmnopqrst", 0, 1);
+    test("abcde", 0, 1, "abcdefghijklmnopqrst", 1, 0);
+    test("abcde", 0, 1, "abcdefghijklmnopqrst", 10, -9);
+    test("abcde", 0, 1, "abcdefghijklmnopqrst", 19, -18);
+    test("abcde", 0, 1, "abcdefghijklmnopqrst", 20, -19);
+    test("abcde", 0, 2, "", 0, 2);
+    test("abcde", 0, 2, "abcde", 0, 2);
+    test("abcde", 0, 2, "abcde", 1, 1);
+    test("abcde", 0, 2, "abcde", 2, 0);
+    test("abcde", 0, 2, "abcde", 4, -2);
+    test("abcde", 0, 2, "abcde", 5, -3);
+    test("abcde", 0, 2, "abcdefghij", 0, 2);
+    test("abcde", 0, 2, "abcdefghij", 1, 1);
+    test("abcde", 0, 2, "abcdefghij", 5, -3);
+    test("abcde", 0, 2, "abcdefghij", 9, -7);
+    test("abcde", 0, 2, "abcdefghij", 10, -8);
+    test("abcde", 0, 2, "abcdefghijklmnopqrst", 0, 2);
+    test("abcde", 0, 2, "abcdefghijklmnopqrst", 1, 1);
+    test("abcde", 0, 2, "abcdefghijklmnopqrst", 10, -8);
+    test("abcde", 0, 2, "abcdefghijklmnopqrst", 19, -17);
+    test("abcde", 0, 2, "abcdefghijklmnopqrst", 20, -18);
+    test("abcde", 0, 4, "", 0, 4);
+    test("abcde", 0, 4, "abcde", 0, 4);
+    test("abcde", 0, 4, "abcde", 1, 3);
+    test("abcde", 0, 4, "abcde", 2, 2);
+}
+
+
+void test1()
+{
+    test("abcde", 0, 4, "abcde", 4, 0);
+    test("abcde", 0, 4, "abcde", 5, -1);
+    test("abcde", 0, 4, "abcdefghij", 0, 4);
+    test("abcde", 0, 4, "abcdefghij", 1, 3);
+    test("abcde", 0, 4, "abcdefghij", 5, -1);
+    test("abcde", 0, 4, "abcdefghij", 9, -5);
+    test("abcde", 0, 4, "abcdefghij", 10, -6);
+    test("abcde", 0, 4, "abcdefghijklmnopqrst", 0, 4);
+    test("abcde", 0, 4, "abcdefghijklmnopqrst", 1, 3);
+    test("abcde", 0, 4, "abcdefghijklmnopqrst", 10, -6);
+    test("abcde", 0, 4, "abcdefghijklmnopqrst", 19, -15);
+    test("abcde", 0, 4, "abcdefghijklmnopqrst", 20, -16);
+    test("abcde", 0, 5, "", 0, 5);
+    test("abcde", 0, 5, "abcde", 0, 5);
+    test("abcde", 0, 5, "abcde", 1, 4);
+    test("abcde", 0, 5, "abcde", 2, 3);
+    test("abcde", 0, 5, "abcde", 4, 1);
+    test("abcde", 0, 5, "abcde", 5, 0);
+    test("abcde", 0, 5, "abcdefghij", 0, 5);
+    test("abcde", 0, 5, "abcdefghij", 1, 4);
+    test("abcde", 0, 5, "abcdefghij", 5, 0);
+    test("abcde", 0, 5, "abcdefghij", 9, -4);
+    test("abcde", 0, 5, "abcdefghij", 10, -5);
+    test("abcde", 0, 5, "abcdefghijklmnopqrst", 0, 5);
+    test("abcde", 0, 5, "abcdefghijklmnopqrst", 1, 4);
+    test("abcde", 0, 5, "abcdefghijklmnopqrst", 10, -5);
+    test("abcde", 0, 5, "abcdefghijklmnopqrst", 19, -14);
+    test("abcde", 0, 5, "abcdefghijklmnopqrst", 20, -15);
+    test("abcde", 0, 6, "", 0, 5);
+    test("abcde", 0, 6, "abcde", 0, 5);
+    test("abcde", 0, 6, "abcde", 1, 4);
+    test("abcde", 0, 6, "abcde", 2, 3);
+    test("abcde", 0, 6, "abcde", 4, 1);
+    test("abcde", 0, 6, "abcde", 5, 0);
+    test("abcde", 0, 6, "abcdefghij", 0, 5);
+    test("abcde", 0, 6, "abcdefghij", 1, 4);
+    test("abcde", 0, 6, "abcdefghij", 5, 0);
+    test("abcde", 0, 6, "abcdefghij", 9, -4);
+    test("abcde", 0, 6, "abcdefghij", 10, -5);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", 0, 5);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", 1, 4);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", 10, -5);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", 19, -14);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", 20, -15);
+    test("abcde", 1, 0, "", 0, 0);
+    test("abcde", 1, 0, "abcde", 0, 0);
+    test("abcde", 1, 0, "abcde", 1, -1);
+    test("abcde", 1, 0, "abcde", 2, -2);
+    test("abcde", 1, 0, "abcde", 4, -4);
+    test("abcde", 1, 0, "abcde", 5, -5);
+    test("abcde", 1, 0, "abcdefghij", 0, 0);
+    test("abcde", 1, 0, "abcdefghij", 1, -1);
+    test("abcde", 1, 0, "abcdefghij", 5, -5);
+    test("abcde", 1, 0, "abcdefghij", 9, -9);
+    test("abcde", 1, 0, "abcdefghij", 10, -10);
+    test("abcde", 1, 0, "abcdefghijklmnopqrst", 0, 0);
+    test("abcde", 1, 0, "abcdefghijklmnopqrst", 1, -1);
+    test("abcde", 1, 0, "abcdefghijklmnopqrst", 10, -10);
+    test("abcde", 1, 0, "abcdefghijklmnopqrst", 19, -19);
+    test("abcde", 1, 0, "abcdefghijklmnopqrst", 20, -20);
+    test("abcde", 1, 1, "", 0, 1);
+    test("abcde", 1, 1, "abcde", 0, 1);
+    test("abcde", 1, 1, "abcde", 1, 1);
+    test("abcde", 1, 1, "abcde", 2, 1);
+    test("abcde", 1, 1, "abcde", 4, 1);
+    test("abcde", 1, 1, "abcde", 5, 1);
+    test("abcde", 1, 1, "abcdefghij", 0, 1);
+    test("abcde", 1, 1, "abcdefghij", 1, 1);
+    test("abcde", 1, 1, "abcdefghij", 5, 1);
+    test("abcde", 1, 1, "abcdefghij", 9, 1);
+    test("abcde", 1, 1, "abcdefghij", 10, 1);
+    test("abcde", 1, 1, "abcdefghijklmnopqrst", 0, 1);
+    test("abcde", 1, 1, "abcdefghijklmnopqrst", 1, 1);
+    test("abcde", 1, 1, "abcdefghijklmnopqrst", 10, 1);
+    test("abcde", 1, 1, "abcdefghijklmnopqrst", 19, 1);
+    test("abcde", 1, 1, "abcdefghijklmnopqrst", 20, 1);
+    test("abcde", 1, 2, "", 0, 2);
+    test("abcde", 1, 2, "abcde", 0, 2);
+    test("abcde", 1, 2, "abcde", 1, 1);
+    test("abcde", 1, 2, "abcde", 2, 1);
+    test("abcde", 1, 2, "abcde", 4, 1);
+    test("abcde", 1, 2, "abcde", 5, 1);
+    test("abcde", 1, 2, "abcdefghij", 0, 2);
+    test("abcde", 1, 2, "abcdefghij", 1, 1);
+    test("abcde", 1, 2, "abcdefghij", 5, 1);
+    test("abcde", 1, 2, "abcdefghij", 9, 1);
+    test("abcde", 1, 2, "abcdefghij", 10, 1);
+    test("abcde", 1, 2, "abcdefghijklmnopqrst", 0, 2);
+    test("abcde", 1, 2, "abcdefghijklmnopqrst", 1, 1);
+    test("abcde", 1, 2, "abcdefghijklmnopqrst", 10, 1);
+    test("abcde", 1, 2, "abcdefghijklmnopqrst", 19, 1);
+    test("abcde", 1, 2, "abcdefghijklmnopqrst", 20, 1);
+    test("abcde", 1, 3, "", 0, 3);
+    test("abcde", 1, 3, "abcde", 0, 3);
+    test("abcde", 1, 3, "abcde", 1, 1);
+    test("abcde", 1, 3, "abcde", 2, 1);
+    test("abcde", 1, 3, "abcde", 4, 1);
+    test("abcde", 1, 3, "abcde", 5, 1);
+    test("abcde", 1, 3, "abcdefghij", 0, 3);
+    test("abcde", 1, 3, "abcdefghij", 1, 1);
+}
+
+
+void test2()
+{
+    test("abcde", 1, 3, "abcdefghij", 5, 1);
+    test("abcde", 1, 3, "abcdefghij", 9, 1);
+    test("abcde", 1, 3, "abcdefghij", 10, 1);
+    test("abcde", 1, 3, "abcdefghijklmnopqrst", 0, 3);
+    test("abcde", 1, 3, "abcdefghijklmnopqrst", 1, 1);
+    test("abcde", 1, 3, "abcdefghijklmnopqrst", 10, 1);
+    test("abcde", 1, 3, "abcdefghijklmnopqrst", 19, 1);
+    test("abcde", 1, 3, "abcdefghijklmnopqrst", 20, 1);
+    test("abcde", 1, 4, "", 0, 4);
+    test("abcde", 1, 4, "abcde", 0, 4);
+    test("abcde", 1, 4, "abcde", 1, 1);
+    test("abcde", 1, 4, "abcde", 2, 1);
+    test("abcde", 1, 4, "abcde", 4, 1);
+    test("abcde", 1, 4, "abcde", 5, 1);
+    test("abcde", 1, 4, "abcdefghij", 0, 4);
+    test("abcde", 1, 4, "abcdefghij", 1, 1);
+    test("abcde", 1, 4, "abcdefghij", 5, 1);
+    test("abcde", 1, 4, "abcdefghij", 9, 1);
+    test("abcde", 1, 4, "abcdefghij", 10, 1);
+    test("abcde", 1, 4, "abcdefghijklmnopqrst", 0, 4);
+    test("abcde", 1, 4, "abcdefghijklmnopqrst", 1, 1);
+    test("abcde", 1, 4, "abcdefghijklmnopqrst", 10, 1);
+    test("abcde", 1, 4, "abcdefghijklmnopqrst", 19, 1);
+    test("abcde", 1, 4, "abcdefghijklmnopqrst", 20, 1);
+    test("abcde", 1, 5, "", 0, 4);
+    test("abcde", 1, 5, "abcde", 0, 4);
+    test("abcde", 1, 5, "abcde", 1, 1);
+    test("abcde", 1, 5, "abcde", 2, 1);
+    test("abcde", 1, 5, "abcde", 4, 1);
+    test("abcde", 1, 5, "abcde", 5, 1);
+    test("abcde", 1, 5, "abcdefghij", 0, 4);
+    test("abcde", 1, 5, "abcdefghij", 1, 1);
+    test("abcde", 1, 5, "abcdefghij", 5, 1);
+    test("abcde", 1, 5, "abcdefghij", 9, 1);
+    test("abcde", 1, 5, "abcdefghij", 10, 1);
+    test("abcde", 1, 5, "abcdefghijklmnopqrst", 0, 4);
+    test("abcde", 1, 5, "abcdefghijklmnopqrst", 1, 1);
+    test("abcde", 1, 5, "abcdefghijklmnopqrst", 10, 1);
+    test("abcde", 1, 5, "abcdefghijklmnopqrst", 19, 1);
+    test("abcde", 1, 5, "abcdefghijklmnopqrst", 20, 1);
+    test("abcde", 2, 0, "", 0, 0);
+    test("abcde", 2, 0, "abcde", 0, 0);
+    test("abcde", 2, 0, "abcde", 1, -1);
+    test("abcde", 2, 0, "abcde", 2, -2);
+    test("abcde", 2, 0, "abcde", 4, -4);
+    test("abcde", 2, 0, "abcde", 5, -5);
+    test("abcde", 2, 0, "abcdefghij", 0, 0);
+    test("abcde", 2, 0, "abcdefghij", 1, -1);
+    test("abcde", 2, 0, "abcdefghij", 5, -5);
+    test("abcde", 2, 0, "abcdefghij", 9, -9);
+    test("abcde", 2, 0, "abcdefghij", 10, -10);
+    test("abcde", 2, 0, "abcdefghijklmnopqrst", 0, 0);
+    test("abcde", 2, 0, "abcdefghijklmnopqrst", 1, -1);
+    test("abcde", 2, 0, "abcdefghijklmnopqrst", 10, -10);
+    test("abcde", 2, 0, "abcdefghijklmnopqrst", 19, -19);
+    test("abcde", 2, 0, "abcdefghijklmnopqrst", 20, -20);
+    test("abcde", 2, 1, "", 0, 1);
+    test("abcde", 2, 1, "abcde", 0, 1);
+    test("abcde", 2, 1, "abcde", 1, 2);
+    test("abcde", 2, 1, "abcde", 2, 2);
+    test("abcde", 2, 1, "abcde", 4, 2);
+    test("abcde", 2, 1, "abcde", 5, 2);
+    test("abcde", 2, 1, "abcdefghij", 0, 1);
+    test("abcde", 2, 1, "abcdefghij", 1, 2);
+    test("abcde", 2, 1, "abcdefghij", 5, 2);
+    test("abcde", 2, 1, "abcdefghij", 9, 2);
+    test("abcde", 2, 1, "abcdefghij", 10, 2);
+    test("abcde", 2, 1, "abcdefghijklmnopqrst", 0, 1);
+    test("abcde", 2, 1, "abcdefghijklmnopqrst", 1, 2);
+    test("abcde", 2, 1, "abcdefghijklmnopqrst", 10, 2);
+    test("abcde", 2, 1, "abcdefghijklmnopqrst", 19, 2);
+    test("abcde", 2, 1, "abcdefghijklmnopqrst", 20, 2);
+    test("abcde", 2, 2, "", 0, 2);
+    test("abcde", 2, 2, "abcde", 0, 2);
+    test("abcde", 2, 2, "abcde", 1, 2);
+    test("abcde", 2, 2, "abcde", 2, 2);
+    test("abcde", 2, 2, "abcde", 4, 2);
+    test("abcde", 2, 2, "abcde", 5, 2);
+    test("abcde", 2, 2, "abcdefghij", 0, 2);
+    test("abcde", 2, 2, "abcdefghij", 1, 2);
+    test("abcde", 2, 2, "abcdefghij", 5, 2);
+    test("abcde", 2, 2, "abcdefghij", 9, 2);
+    test("abcde", 2, 2, "abcdefghij", 10, 2);
+    test("abcde", 2, 2, "abcdefghijklmnopqrst", 0, 2);
+    test("abcde", 2, 2, "abcdefghijklmnopqrst", 1, 2);
+    test("abcde", 2, 2, "abcdefghijklmnopqrst", 10, 2);
+    test("abcde", 2, 2, "abcdefghijklmnopqrst", 19, 2);
+    test("abcde", 2, 2, "abcdefghijklmnopqrst", 20, 2);
+    test("abcde", 2, 3, "", 0, 3);
+    test("abcde", 2, 3, "abcde", 0, 3);
+    test("abcde", 2, 3, "abcde", 1, 2);
+    test("abcde", 2, 3, "abcde", 2, 2);
+    test("abcde", 2, 3, "abcde", 4, 2);
+    test("abcde", 2, 3, "abcde", 5, 2);
+    test("abcde", 2, 3, "abcdefghij", 0, 3);
+    test("abcde", 2, 3, "abcdefghij", 1, 2);
+    test("abcde", 2, 3, "abcdefghij", 5, 2);
+    test("abcde", 2, 3, "abcdefghij", 9, 2);
+    test("abcde", 2, 3, "abcdefghij", 10, 2);
+    test("abcde", 2, 3, "abcdefghijklmnopqrst", 0, 3);
+}
+
+
+void test3()
+{
+    test("abcde", 2, 3, "abcdefghijklmnopqrst", 1, 2);
+    test("abcde", 2, 3, "abcdefghijklmnopqrst", 10, 2);
+    test("abcde", 2, 3, "abcdefghijklmnopqrst", 19, 2);
+    test("abcde", 2, 3, "abcdefghijklmnopqrst", 20, 2);
+    test("abcde", 2, 4, "", 0, 3);
+    test("abcde", 2, 4, "abcde", 0, 3);
+    test("abcde", 2, 4, "abcde", 1, 2);
+    test("abcde", 2, 4, "abcde", 2, 2);
+    test("abcde", 2, 4, "abcde", 4, 2);
+    test("abcde", 2, 4, "abcde", 5, 2);
+    test("abcde", 2, 4, "abcdefghij", 0, 3);
+    test("abcde", 2, 4, "abcdefghij", 1, 2);
+    test("abcde", 2, 4, "abcdefghij", 5, 2);
+    test("abcde", 2, 4, "abcdefghij", 9, 2);
+    test("abcde", 2, 4, "abcdefghij", 10, 2);
+    test("abcde", 2, 4, "abcdefghijklmnopqrst", 0, 3);
+    test("abcde", 2, 4, "abcdefghijklmnopqrst", 1, 2);
+    test("abcde", 2, 4, "abcdefghijklmnopqrst", 10, 2);
+    test("abcde", 2, 4, "abcdefghijklmnopqrst", 19, 2);
+    test("abcde", 2, 4, "abcdefghijklmnopqrst", 20, 2);
+    test("abcde", 4, 0, "", 0, 0);
+    test("abcde", 4, 0, "abcde", 0, 0);
+    test("abcde", 4, 0, "abcde", 1, -1);
+    test("abcde", 4, 0, "abcde", 2, -2);
+    test("abcde", 4, 0, "abcde", 4, -4);
+    test("abcde", 4, 0, "abcde", 5, -5);
+    test("abcde", 4, 0, "abcdefghij", 0, 0);
+    test("abcde", 4, 0, "abcdefghij", 1, -1);
+    test("abcde", 4, 0, "abcdefghij", 5, -5);
+    test("abcde", 4, 0, "abcdefghij", 9, -9);
+    test("abcde", 4, 0, "abcdefghij", 10, -10);
+    test("abcde", 4, 0, "abcdefghijklmnopqrst", 0, 0);
+    test("abcde", 4, 0, "abcdefghijklmnopqrst", 1, -1);
+    test("abcde", 4, 0, "abcdefghijklmnopqrst", 10, -10);
+    test("abcde", 4, 0, "abcdefghijklmnopqrst", 19, -19);
+    test("abcde", 4, 0, "abcdefghijklmnopqrst", 20, -20);
+    test("abcde", 4, 1, "", 0, 1);
+    test("abcde", 4, 1, "abcde", 0, 1);
+    test("abcde", 4, 1, "abcde", 1, 4);
+    test("abcde", 4, 1, "abcde", 2, 4);
+    test("abcde", 4, 1, "abcde", 4, 4);
+    test("abcde", 4, 1, "abcde", 5, 4);
+    test("abcde", 4, 1, "abcdefghij", 0, 1);
+    test("abcde", 4, 1, "abcdefghij", 1, 4);
+    test("abcde", 4, 1, "abcdefghij", 5, 4);
+    test("abcde", 4, 1, "abcdefghij", 9, 4);
+    test("abcde", 4, 1, "abcdefghij", 10, 4);
+    test("abcde", 4, 1, "abcdefghijklmnopqrst", 0, 1);
+    test("abcde", 4, 1, "abcdefghijklmnopqrst", 1, 4);
+    test("abcde", 4, 1, "abcdefghijklmnopqrst", 10, 4);
+    test("abcde", 4, 1, "abcdefghijklmnopqrst", 19, 4);
+    test("abcde", 4, 1, "abcdefghijklmnopqrst", 20, 4);
+    test("abcde", 4, 2, "", 0, 1);
+    test("abcde", 4, 2, "abcde", 0, 1);
+    test("abcde", 4, 2, "abcde", 1, 4);
+    test("abcde", 4, 2, "abcde", 2, 4);
+    test("abcde", 4, 2, "abcde", 4, 4);
+    test("abcde", 4, 2, "abcde", 5, 4);
+    test("abcde", 4, 2, "abcdefghij", 0, 1);
+    test("abcde", 4, 2, "abcdefghij", 1, 4);
+    test("abcde", 4, 2, "abcdefghij", 5, 4);
+    test("abcde", 4, 2, "abcdefghij", 9, 4);
+    test("abcde", 4, 2, "abcdefghij", 10, 4);
+    test("abcde", 4, 2, "abcdefghijklmnopqrst", 0, 1);
+    test("abcde", 4, 2, "abcdefghijklmnopqrst", 1, 4);
+    test("abcde", 4, 2, "abcdefghijklmnopqrst", 10, 4);
+    test("abcde", 4, 2, "abcdefghijklmnopqrst", 19, 4);
+    test("abcde", 4, 2, "abcdefghijklmnopqrst", 20, 4);
+    test("abcde", 5, 0, "", 0, 0);
+    test("abcde", 5, 0, "abcde", 0, 0);
+    test("abcde", 5, 0, "abcde", 1, -1);
+    test("abcde", 5, 0, "abcde", 2, -2);
+    test("abcde", 5, 0, "abcde", 4, -4);
+    test("abcde", 5, 0, "abcde", 5, -5);
+    test("abcde", 5, 0, "abcdefghij", 0, 0);
+    test("abcde", 5, 0, "abcdefghij", 1, -1);
+    test("abcde", 5, 0, "abcdefghij", 5, -5);
+    test("abcde", 5, 0, "abcdefghij", 9, -9);
+    test("abcde", 5, 0, "abcdefghij", 10, -10);
+    test("abcde", 5, 0, "abcdefghijklmnopqrst", 0, 0);
+    test("abcde", 5, 0, "abcdefghijklmnopqrst", 1, -1);
+    test("abcde", 5, 0, "abcdefghijklmnopqrst", 10, -10);
+    test("abcde", 5, 0, "abcdefghijklmnopqrst", 19, -19);
+    test("abcde", 5, 0, "abcdefghijklmnopqrst", 20, -20);
+    test("abcde", 5, 1, "", 0, 0);
+    test("abcde", 5, 1, "abcde", 0, 0);
+    test("abcde", 5, 1, "abcde", 1, -1);
+    test("abcde", 5, 1, "abcde", 2, -2);
+    test("abcde", 5, 1, "abcde", 4, -4);
+    test("abcde", 5, 1, "abcde", 5, -5);
+    test("abcde", 5, 1, "abcdefghij", 0, 0);
+    test("abcde", 5, 1, "abcdefghij", 1, -1);
+    test("abcde", 5, 1, "abcdefghij", 5, -5);
+    test("abcde", 5, 1, "abcdefghij", 9, -9);
+    test("abcde", 5, 1, "abcdefghij", 10, -10);
+    test("abcde", 5, 1, "abcdefghijklmnopqrst", 0, 0);
+    test("abcde", 5, 1, "abcdefghijklmnopqrst", 1, -1);
+    test("abcde", 5, 1, "abcdefghijklmnopqrst", 10, -10);
+    test("abcde", 5, 1, "abcdefghijklmnopqrst", 19, -19);
+    test("abcde", 5, 1, "abcdefghijklmnopqrst", 20, -20);
+}
+
+
+void test4()
+{
+    test("abcde", 6, 0, "", 0, 0);
+    test("abcde", 6, 0, "abcde", 0, 0);
+    test("abcde", 6, 0, "abcde", 1, 0);
+    test("abcde", 6, 0, "abcde", 2, 0);
+    test("abcde", 6, 0, "abcde", 4, 0);
+    test("abcde", 6, 0, "abcde", 5, 0);
+    test("abcde", 6, 0, "abcdefghij", 0, 0);
+    test("abcde", 6, 0, "abcdefghij", 1, 0);
+    test("abcde", 6, 0, "abcdefghij", 5, 0);
+    test("abcde", 6, 0, "abcdefghij", 9, 0);
+    test("abcde", 6, 0, "abcdefghij", 10, 0);
+    test("abcde", 6, 0, "abcdefghijklmnopqrst", 0, 0);
+    test("abcde", 6, 0, "abcdefghijklmnopqrst", 1, 0);
+    test("abcde", 6, 0, "abcdefghijklmnopqrst", 10, 0);
+    test("abcde", 6, 0, "abcdefghijklmnopqrst", 19, 0);
+    test("abcde", 6, 0, "abcdefghijklmnopqrst", 20, 0);
+    test("abcdefghij", 0, 0, "", 0, 0);
+    test("abcdefghij", 0, 0, "abcde", 0, 0);
+    test("abcdefghij", 0, 0, "abcde", 1, -1);
+    test("abcdefghij", 0, 0, "abcde", 2, -2);
+    test("abcdefghij", 0, 0, "abcde", 4, -4);
+    test("abcdefghij", 0, 0, "abcde", 5, -5);
+    test("abcdefghij", 0, 0, "abcdefghij", 0, 0);
+    test("abcdefghij", 0, 0, "abcdefghij", 1, -1);
+    test("abcdefghij", 0, 0, "abcdefghij", 5, -5);
+    test("abcdefghij", 0, 0, "abcdefghij", 9, -9);
+    test("abcdefghij", 0, 0, "abcdefghij", 10, -10);
+    test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", 0, 0);
+    test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", 1, -1);
+    test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", 10, -10);
+    test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", 19, -19);
+    test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", 20, -20);
+    test("abcdefghij", 0, 1, "", 0, 1);
+    test("abcdefghij", 0, 1, "abcde", 0, 1);
+    test("abcdefghij", 0, 1, "abcde", 1, 0);
+    test("abcdefghij", 0, 1, "abcde", 2, -1);
+    test("abcdefghij", 0, 1, "abcde", 4, -3);
+    test("abcdefghij", 0, 1, "abcde", 5, -4);
+    test("abcdefghij", 0, 1, "abcdefghij", 0, 1);
+    test("abcdefghij", 0, 1, "abcdefghij", 1, 0);
+    test("abcdefghij", 0, 1, "abcdefghij", 5, -4);
+    test("abcdefghij", 0, 1, "abcdefghij", 9, -8);
+    test("abcdefghij", 0, 1, "abcdefghij", 10, -9);
+    test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", 0, 1);
+    test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", 1, 0);
+    test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", 10, -9);
+    test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", 19, -18);
+    test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", 20, -19);
+    test("abcdefghij", 0, 5, "", 0, 5);
+    test("abcdefghij", 0, 5, "abcde", 0, 5);
+    test("abcdefghij", 0, 5, "abcde", 1, 4);
+    test("abcdefghij", 0, 5, "abcde", 2, 3);
+    test("abcdefghij", 0, 5, "abcde", 4, 1);
+    test("abcdefghij", 0, 5, "abcde", 5, 0);
+    test("abcdefghij", 0, 5, "abcdefghij", 0, 5);
+    test("abcdefghij", 0, 5, "abcdefghij", 1, 4);
+    test("abcdefghij", 0, 5, "abcdefghij", 5, 0);
+    test("abcdefghij", 0, 5, "abcdefghij", 9, -4);
+    test("abcdefghij", 0, 5, "abcdefghij", 10, -5);
+    test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", 0, 5);
+    test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", 1, 4);
+    test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", 10, -5);
+    test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", 19, -14);
+    test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", 20, -15);
+    test("abcdefghij", 0, 9, "", 0, 9);
+    test("abcdefghij", 0, 9, "abcde", 0, 9);
+    test("abcdefghij", 0, 9, "abcde", 1, 8);
+    test("abcdefghij", 0, 9, "abcde", 2, 7);
+    test("abcdefghij", 0, 9, "abcde", 4, 5);
+    test("abcdefghij", 0, 9, "abcde", 5, 4);
+    test("abcdefghij", 0, 9, "abcdefghij", 0, 9);
+    test("abcdefghij", 0, 9, "abcdefghij", 1, 8);
+    test("abcdefghij", 0, 9, "abcdefghij", 5, 4);
+    test("abcdefghij", 0, 9, "abcdefghij", 9, 0);
+    test("abcdefghij", 0, 9, "abcdefghij", 10, -1);
+    test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", 0, 9);
+    test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", 1, 8);
+    test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", 10, -1);
+    test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", 19, -10);
+    test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", 20, -11);
+    test("abcdefghij", 0, 10, "", 0, 10);
+    test("abcdefghij", 0, 10, "abcde", 0, 10);
+    test("abcdefghij", 0, 10, "abcde", 1, 9);
+    test("abcdefghij", 0, 10, "abcde", 2, 8);
+    test("abcdefghij", 0, 10, "abcde", 4, 6);
+    test("abcdefghij", 0, 10, "abcde", 5, 5);
+    test("abcdefghij", 0, 10, "abcdefghij", 0, 10);
+    test("abcdefghij", 0, 10, "abcdefghij", 1, 9);
+    test("abcdefghij", 0, 10, "abcdefghij", 5, 5);
+    test("abcdefghij", 0, 10, "abcdefghij", 9, 1);
+    test("abcdefghij", 0, 10, "abcdefghij", 10, 0);
+    test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", 0, 10);
+    test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", 1, 9);
+    test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", 10, 0);
+    test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", 19, -9);
+    test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", 20, -10);
+    test("abcdefghij", 0, 11, "", 0, 10);
+    test("abcdefghij", 0, 11, "abcde", 0, 10);
+    test("abcdefghij", 0, 11, "abcde", 1, 9);
+    test("abcdefghij", 0, 11, "abcde", 2, 8);
+}
+
+
+void test5()
+{
+    test("abcdefghij", 0, 11, "abcde", 4, 6);
+    test("abcdefghij", 0, 11, "abcde", 5, 5);
+    test("abcdefghij", 0, 11, "abcdefghij", 0, 10);
+    test("abcdefghij", 0, 11, "abcdefghij", 1, 9);
+    test("abcdefghij", 0, 11, "abcdefghij", 5, 5);
+    test("abcdefghij", 0, 11, "abcdefghij", 9, 1);
+    test("abcdefghij", 0, 11, "abcdefghij", 10, 0);
+    test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", 0, 10);
+    test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", 1, 9);
+    test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", 10, 0);
+    test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", 19, -9);
+    test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", 20, -10);
+    test("abcdefghij", 1, 0, "", 0, 0);
+    test("abcdefghij", 1, 0, "abcde", 0, 0);
+    test("abcdefghij", 1, 0, "abcde", 1, -1);
+    test("abcdefghij", 1, 0, "abcde", 2, -2);
+    test("abcdefghij", 1, 0, "abcde", 4, -4);
+    test("abcdefghij", 1, 0, "abcde", 5, -5);
+    test("abcdefghij", 1, 0, "abcdefghij", 0, 0);
+    test("abcdefghij", 1, 0, "abcdefghij", 1, -1);
+    test("abcdefghij", 1, 0, "abcdefghij", 5, -5);
+    test("abcdefghij", 1, 0, "abcdefghij", 9, -9);
+    test("abcdefghij", 1, 0, "abcdefghij", 10, -10);
+    test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", 0, 0);
+    test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", 1, -1);
+    test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", 10, -10);
+    test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", 19, -19);
+    test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", 20, -20);
+    test("abcdefghij", 1, 1, "", 0, 1);
+    test("abcdefghij", 1, 1, "abcde", 0, 1);
+    test("abcdefghij", 1, 1, "abcde", 1, 1);
+    test("abcdefghij", 1, 1, "abcde", 2, 1);
+    test("abcdefghij", 1, 1, "abcde", 4, 1);
+    test("abcdefghij", 1, 1, "abcde", 5, 1);
+    test("abcdefghij", 1, 1, "abcdefghij", 0, 1);
+    test("abcdefghij", 1, 1, "abcdefghij", 1, 1);
+    test("abcdefghij", 1, 1, "abcdefghij", 5, 1);
+    test("abcdefghij", 1, 1, "abcdefghij", 9, 1);
+    test("abcdefghij", 1, 1, "abcdefghij", 10, 1);
+    test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 0, 1);
+    test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 1, 1);
+    test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 10, 1);
+    test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 19, 1);
+    test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 20, 1);
+    test("abcdefghij", 1, 4, "", 0, 4);
+    test("abcdefghij", 1, 4, "abcde", 0, 4);
+    test("abcdefghij", 1, 4, "abcde", 1, 1);
+    test("abcdefghij", 1, 4, "abcde", 2, 1);
+    test("abcdefghij", 1, 4, "abcde", 4, 1);
+    test("abcdefghij", 1, 4, "abcde", 5, 1);
+    test("abcdefghij", 1, 4, "abcdefghij", 0, 4);
+    test("abcdefghij", 1, 4, "abcdefghij", 1, 1);
+    test("abcdefghij", 1, 4, "abcdefghij", 5, 1);
+    test("abcdefghij", 1, 4, "abcdefghij", 9, 1);
+    test("abcdefghij", 1, 4, "abcdefghij", 10, 1);
+    test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 0, 4);
+    test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 1, 1);
+    test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 10, 1);
+    test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 19, 1);
+    test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 20, 1);
+    test("abcdefghij", 1, 8, "", 0, 8);
+    test("abcdefghij", 1, 8, "abcde", 0, 8);
+    test("abcdefghij", 1, 8, "abcde", 1, 1);
+    test("abcdefghij", 1, 8, "abcde", 2, 1);
+    test("abcdefghij", 1, 8, "abcde", 4, 1);
+    test("abcdefghij", 1, 8, "abcde", 5, 1);
+    test("abcdefghij", 1, 8, "abcdefghij", 0, 8);
+    test("abcdefghij", 1, 8, "abcdefghij", 1, 1);
+    test("abcdefghij", 1, 8, "abcdefghij", 5, 1);
+    test("abcdefghij", 1, 8, "abcdefghij", 9, 1);
+    test("abcdefghij", 1, 8, "abcdefghij", 10, 1);
+    test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 0, 8);
+    test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 1, 1);
+    test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 10, 1);
+    test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 19, 1);
+    test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 20, 1);
+    test("abcdefghij", 1, 9, "", 0, 9);
+    test("abcdefghij", 1, 9, "abcde", 0, 9);
+    test("abcdefghij", 1, 9, "abcde", 1, 1);
+    test("abcdefghij", 1, 9, "abcde", 2, 1);
+    test("abcdefghij", 1, 9, "abcde", 4, 1);
+    test("abcdefghij", 1, 9, "abcde", 5, 1);
+    test("abcdefghij", 1, 9, "abcdefghij", 0, 9);
+    test("abcdefghij", 1, 9, "abcdefghij", 1, 1);
+    test("abcdefghij", 1, 9, "abcdefghij", 5, 1);
+    test("abcdefghij", 1, 9, "abcdefghij", 9, 1);
+    test("abcdefghij", 1, 9, "abcdefghij", 10, 1);
+    test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 0, 9);
+    test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 1, 1);
+    test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 10, 1);
+    test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 19, 1);
+    test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 20, 1);
+    test("abcdefghij", 1, 10, "", 0, 9);
+    test("abcdefghij", 1, 10, "abcde", 0, 9);
+    test("abcdefghij", 1, 10, "abcde", 1, 1);
+    test("abcdefghij", 1, 10, "abcde", 2, 1);
+    test("abcdefghij", 1, 10, "abcde", 4, 1);
+    test("abcdefghij", 1, 10, "abcde", 5, 1);
+    test("abcdefghij", 1, 10, "abcdefghij", 0, 9);
+    test("abcdefghij", 1, 10, "abcdefghij", 1, 1);
+}
+
+
+void test6()
+{
+    test("abcdefghij", 1, 10, "abcdefghij", 5, 1);
+    test("abcdefghij", 1, 10, "abcdefghij", 9, 1);
+    test("abcdefghij", 1, 10, "abcdefghij", 10, 1);
+    test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 0, 9);
+    test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 1, 1);
+    test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 10, 1);
+    test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 19, 1);
+    test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 20, 1);
+    test("abcdefghij", 5, 0, "", 0, 0);
+    test("abcdefghij", 5, 0, "abcde", 0, 0);
+    test("abcdefghij", 5, 0, "abcde", 1, -1);
+    test("abcdefghij", 5, 0, "abcde", 2, -2);
+    test("abcdefghij", 5, 0, "abcde", 4, -4);
+    test("abcdefghij", 5, 0, "abcde", 5, -5);
+    test("abcdefghij", 5, 0, "abcdefghij", 0, 0);
+    test("abcdefghij", 5, 0, "abcdefghij", 1, -1);
+    test("abcdefghij", 5, 0, "abcdefghij", 5, -5);
+    test("abcdefghij", 5, 0, "abcdefghij", 9, -9);
+    test("abcdefghij", 5, 0, "abcdefghij", 10, -10);
+    test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", 0, 0);
+    test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", 1, -1);
+    test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", 10, -10);
+    test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", 19, -19);
+    test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", 20, -20);
+    test("abcdefghij", 5, 1, "", 0, 1);
+    test("abcdefghij", 5, 1, "abcde", 0, 1);
+    test("abcdefghij", 5, 1, "abcde", 1, 5);
+    test("abcdefghij", 5, 1, "abcde", 2, 5);
+    test("abcdefghij", 5, 1, "abcde", 4, 5);
+    test("abcdefghij", 5, 1, "abcde", 5, 5);
+    test("abcdefghij", 5, 1, "abcdefghij", 0, 1);
+    test("abcdefghij", 5, 1, "abcdefghij", 1, 5);
+    test("abcdefghij", 5, 1, "abcdefghij", 5, 5);
+    test("abcdefghij", 5, 1, "abcdefghij", 9, 5);
+    test("abcdefghij", 5, 1, "abcdefghij", 10, 5);
+    test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 0, 1);
+    test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 1, 5);
+    test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 10, 5);
+    test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 19, 5);
+    test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 20, 5);
+    test("abcdefghij", 5, 2, "", 0, 2);
+    test("abcdefghij", 5, 2, "abcde", 0, 2);
+    test("abcdefghij", 5, 2, "abcde", 1, 5);
+    test("abcdefghij", 5, 2, "abcde", 2, 5);
+    test("abcdefghij", 5, 2, "abcde", 4, 5);
+    test("abcdefghij", 5, 2, "abcde", 5, 5);
+    test("abcdefghij", 5, 2, "abcdefghij", 0, 2);
+    test("abcdefghij", 5, 2, "abcdefghij", 1, 5);
+    test("abcdefghij", 5, 2, "abcdefghij", 5, 5);
+    test("abcdefghij", 5, 2, "abcdefghij", 9, 5);
+    test("abcdefghij", 5, 2, "abcdefghij", 10, 5);
+    test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 0, 2);
+    test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 1, 5);
+    test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 10, 5);
+    test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 19, 5);
+    test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 20, 5);
+    test("abcdefghij", 5, 4, "", 0, 4);
+    test("abcdefghij", 5, 4, "abcde", 0, 4);
+    test("abcdefghij", 5, 4, "abcde", 1, 5);
+    test("abcdefghij", 5, 4, "abcde", 2, 5);
+    test("abcdefghij", 5, 4, "abcde", 4, 5);
+    test("abcdefghij", 5, 4, "abcde", 5, 5);
+    test("abcdefghij", 5, 4, "abcdefghij", 0, 4);
+    test("abcdefghij", 5, 4, "abcdefghij", 1, 5);
+    test("abcdefghij", 5, 4, "abcdefghij", 5, 5);
+    test("abcdefghij", 5, 4, "abcdefghij", 9, 5);
+    test("abcdefghij", 5, 4, "abcdefghij", 10, 5);
+    test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 0, 4);
+    test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 1, 5);
+    test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 10, 5);
+    test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 19, 5);
+    test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 20, 5);
+    test("abcdefghij", 5, 5, "", 0, 5);
+    test("abcdefghij", 5, 5, "abcde", 0, 5);
+    test("abcdefghij", 5, 5, "abcde", 1, 5);
+    test("abcdefghij", 5, 5, "abcde", 2, 5);
+    test("abcdefghij", 5, 5, "abcde", 4, 5);
+    test("abcdefghij", 5, 5, "abcde", 5, 5);
+    test("abcdefghij", 5, 5, "abcdefghij", 0, 5);
+    test("abcdefghij", 5, 5, "abcdefghij", 1, 5);
+    test("abcdefghij", 5, 5, "abcdefghij", 5, 5);
+    test("abcdefghij", 5, 5, "abcdefghij", 9, 5);
+    test("abcdefghij", 5, 5, "abcdefghij", 10, 5);
+    test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 0, 5);
+    test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 1, 5);
+    test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 10, 5);
+    test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 19, 5);
+    test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 20, 5);
+    test("abcdefghij", 5, 6, "", 0, 5);
+    test("abcdefghij", 5, 6, "abcde", 0, 5);
+    test("abcdefghij", 5, 6, "abcde", 1, 5);
+    test("abcdefghij", 5, 6, "abcde", 2, 5);
+    test("abcdefghij", 5, 6, "abcde", 4, 5);
+    test("abcdefghij", 5, 6, "abcde", 5, 5);
+    test("abcdefghij", 5, 6, "abcdefghij", 0, 5);
+    test("abcdefghij", 5, 6, "abcdefghij", 1, 5);
+    test("abcdefghij", 5, 6, "abcdefghij", 5, 5);
+    test("abcdefghij", 5, 6, "abcdefghij", 9, 5);
+    test("abcdefghij", 5, 6, "abcdefghij", 10, 5);
+    test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 0, 5);
+}
+
+
+void test7()
+{
+    test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 1, 5);
+    test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 10, 5);
+    test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 19, 5);
+    test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 20, 5);
+    test("abcdefghij", 9, 0, "", 0, 0);
+    test("abcdefghij", 9, 0, "abcde", 0, 0);
+    test("abcdefghij", 9, 0, "abcde", 1, -1);
+    test("abcdefghij", 9, 0, "abcde", 2, -2);
+    test("abcdefghij", 9, 0, "abcde", 4, -4);
+    test("abcdefghij", 9, 0, "abcde", 5, -5);
+    test("abcdefghij", 9, 0, "abcdefghij", 0, 0);
+    test("abcdefghij", 9, 0, "abcdefghij", 1, -1);
+    test("abcdefghij", 9, 0, "abcdefghij", 5, -5);
+    test("abcdefghij", 9, 0, "abcdefghij", 9, -9);
+    test("abcdefghij", 9, 0, "abcdefghij", 10, -10);
+    test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", 0, 0);
+    test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", 1, -1);
+    test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", 10, -10);
+    test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", 19, -19);
+    test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", 20, -20);
+    test("abcdefghij", 9, 1, "", 0, 1);
+    test("abcdefghij", 9, 1, "abcde", 0, 1);
+    test("abcdefghij", 9, 1, "abcde", 1, 9);
+    test("abcdefghij", 9, 1, "abcde", 2, 9);
+    test("abcdefghij", 9, 1, "abcde", 4, 9);
+    test("abcdefghij", 9, 1, "abcde", 5, 9);
+    test("abcdefghij", 9, 1, "abcdefghij", 0, 1);
+    test("abcdefghij", 9, 1, "abcdefghij", 1, 9);
+    test("abcdefghij", 9, 1, "abcdefghij", 5, 9);
+    test("abcdefghij", 9, 1, "abcdefghij", 9, 9);
+    test("abcdefghij", 9, 1, "abcdefghij", 10, 9);
+    test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 0, 1);
+    test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 1, 9);
+    test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 10, 9);
+    test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 19, 9);
+    test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 20, 9);
+    test("abcdefghij", 9, 2, "", 0, 1);
+    test("abcdefghij", 9, 2, "abcde", 0, 1);
+    test("abcdefghij", 9, 2, "abcde", 1, 9);
+    test("abcdefghij", 9, 2, "abcde", 2, 9);
+    test("abcdefghij", 9, 2, "abcde", 4, 9);
+    test("abcdefghij", 9, 2, "abcde", 5, 9);
+    test("abcdefghij", 9, 2, "abcdefghij", 0, 1);
+    test("abcdefghij", 9, 2, "abcdefghij", 1, 9);
+    test("abcdefghij", 9, 2, "abcdefghij", 5, 9);
+    test("abcdefghij", 9, 2, "abcdefghij", 9, 9);
+    test("abcdefghij", 9, 2, "abcdefghij", 10, 9);
+    test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 0, 1);
+    test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 1, 9);
+    test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 10, 9);
+    test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 19, 9);
+    test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 20, 9);
+    test("abcdefghij", 10, 0, "", 0, 0);
+    test("abcdefghij", 10, 0, "abcde", 0, 0);
+    test("abcdefghij", 10, 0, "abcde", 1, -1);
+    test("abcdefghij", 10, 0, "abcde", 2, -2);
+    test("abcdefghij", 10, 0, "abcde", 4, -4);
+    test("abcdefghij", 10, 0, "abcde", 5, -5);
+    test("abcdefghij", 10, 0, "abcdefghij", 0, 0);
+    test("abcdefghij", 10, 0, "abcdefghij", 1, -1);
+    test("abcdefghij", 10, 0, "abcdefghij", 5, -5);
+    test("abcdefghij", 10, 0, "abcdefghij", 9, -9);
+    test("abcdefghij", 10, 0, "abcdefghij", 10, -10);
+    test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", 0, 0);
+    test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", 1, -1);
+    test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", 10, -10);
+    test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", 19, -19);
+    test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", 20, -20);
+    test("abcdefghij", 10, 1, "", 0, 0);
+    test("abcdefghij", 10, 1, "abcde", 0, 0);
+    test("abcdefghij", 10, 1, "abcde", 1, -1);
+    test("abcdefghij", 10, 1, "abcde", 2, -2);
+    test("abcdefghij", 10, 1, "abcde", 4, -4);
+    test("abcdefghij", 10, 1, "abcde", 5, -5);
+    test("abcdefghij", 10, 1, "abcdefghij", 0, 0);
+    test("abcdefghij", 10, 1, "abcdefghij", 1, -1);
+    test("abcdefghij", 10, 1, "abcdefghij", 5, -5);
+    test("abcdefghij", 10, 1, "abcdefghij", 9, -9);
+    test("abcdefghij", 10, 1, "abcdefghij", 10, -10);
+    test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", 0, 0);
+    test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", 1, -1);
+    test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", 10, -10);
+    test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", 19, -19);
+    test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", 20, -20);
+    test("abcdefghij", 11, 0, "", 0, 0);
+    test("abcdefghij", 11, 0, "abcde", 0, 0);
+    test("abcdefghij", 11, 0, "abcde", 1, 0);
+    test("abcdefghij", 11, 0, "abcde", 2, 0);
+    test("abcdefghij", 11, 0, "abcde", 4, 0);
+    test("abcdefghij", 11, 0, "abcde", 5, 0);
+    test("abcdefghij", 11, 0, "abcdefghij", 0, 0);
+    test("abcdefghij", 11, 0, "abcdefghij", 1, 0);
+    test("abcdefghij", 11, 0, "abcdefghij", 5, 0);
+    test("abcdefghij", 11, 0, "abcdefghij", 9, 0);
+    test("abcdefghij", 11, 0, "abcdefghij", 10, 0);
+    test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 0, 0);
+    test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 1, 0);
+    test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 10, 0);
+    test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 19, 0);
+    test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 20, 0);
+}
+
+void test8()
+{
+    test("abcdefghijklmnopqrst", 0, 0, "", 0, 0);
+    test("abcdefghijklmnopqrst", 0, 0, "abcde", 0, 0);
+    test("abcdefghijklmnopqrst", 0, 0, "abcde", 1, -1);
+    test("abcdefghijklmnopqrst", 0, 0, "abcde", 2, -2);
+    test("abcdefghijklmnopqrst", 0, 0, "abcde", 4, -4);
+    test("abcdefghijklmnopqrst", 0, 0, "abcde", 5, -5);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", 0, 0);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", 1, -1);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", 5, -5);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", 9, -9);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", 10, -10);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", 0, 0);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", 1, -1);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", 10, -10);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", 19, -19);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", 20, -20);
+    test("abcdefghijklmnopqrst", 0, 1, "", 0, 1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcde", 0, 1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcde", 1, 0);
+    test("abcdefghijklmnopqrst", 0, 1, "abcde", 2, -1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcde", 4, -3);
+    test("abcdefghijklmnopqrst", 0, 1, "abcde", 5, -4);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", 0, 1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", 1, 0);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", 5, -4);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", 9, -8);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", 10, -9);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", 0, 1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", 1, 0);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", 10, -9);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", 19, -18);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", 20, -19);
+    test("abcdefghijklmnopqrst", 0, 10, "", 0, 10);
+    test("abcdefghijklmnopqrst", 0, 10, "abcde", 0, 10);
+    test("abcdefghijklmnopqrst", 0, 10, "abcde", 1, 9);
+    test("abcdefghijklmnopqrst", 0, 10, "abcde", 2, 8);
+    test("abcdefghijklmnopqrst", 0, 10, "abcde", 4, 6);
+    test("abcdefghijklmnopqrst", 0, 10, "abcde", 5, 5);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 0, 10);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 1, 9);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 5, 5);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 9, 1);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 10, 0);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", 0, 10);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", 1, 9);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", 10, 0);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", 19, -9);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", 20, -10);
+    test("abcdefghijklmnopqrst", 0, 19, "", 0, 19);
+    test("abcdefghijklmnopqrst", 0, 19, "abcde", 0, 19);
+    test("abcdefghijklmnopqrst", 0, 19, "abcde", 1, 18);
+    test("abcdefghijklmnopqrst", 0, 19, "abcde", 2, 17);
+    test("abcdefghijklmnopqrst", 0, 19, "abcde", 4, 15);
+    test("abcdefghijklmnopqrst", 0, 19, "abcde", 5, 14);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 0, 19);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 1, 18);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 5, 14);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 9, 10);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 10, 9);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", 0, 19);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", 1, 18);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", 10, 9);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", 19, 0);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", 20, -1);
+    test("abcdefghijklmnopqrst", 0, 20, "", 0, 20);
+    test("abcdefghijklmnopqrst", 0, 20, "abcde", 0, 20);
+    test("abcdefghijklmnopqrst", 0, 20, "abcde", 1, 19);
+    test("abcdefghijklmnopqrst", 0, 20, "abcde", 2, 18);
+    test("abcdefghijklmnopqrst", 0, 20, "abcde", 4, 16);
+    test("abcdefghijklmnopqrst", 0, 20, "abcde", 5, 15);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 0, 20);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 1, 19);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 5, 15);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 9, 11);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 10, 10);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 0, 20);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 1, 19);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 10, 10);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 19, 1);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 20, 0);
+    test("abcdefghijklmnopqrst", 0, 21, "", 0, 20);
+    test("abcdefghijklmnopqrst", 0, 21, "abcde", 0, 20);
+    test("abcdefghijklmnopqrst", 0, 21, "abcde", 1, 19);
+    test("abcdefghijklmnopqrst", 0, 21, "abcde", 2, 18);
+    test("abcdefghijklmnopqrst", 0, 21, "abcde", 4, 16);
+    test("abcdefghijklmnopqrst", 0, 21, "abcde", 5, 15);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 0, 20);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 1, 19);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 5, 15);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 9, 11);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 10, 10);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 0, 20);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 1, 19);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 10, 10);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 19, 1);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 20, 0);
+    test("abcdefghijklmnopqrst", 1, 0, "", 0, 0);
+    test("abcdefghijklmnopqrst", 1, 0, "abcde", 0, 0);
+    test("abcdefghijklmnopqrst", 1, 0, "abcde", 1, -1);
+    test("abcdefghijklmnopqrst", 1, 0, "abcde", 2, -2);
+}
+
+
+void test9()
+{
+    test("abcdefghijklmnopqrst", 1, 0, "abcde", 4, -4);
+    test("abcdefghijklmnopqrst", 1, 0, "abcde", 5, -5);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", 0, 0);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", 1, -1);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", 5, -5);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", 9, -9);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", 10, -10);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", 0, 0);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", 1, -1);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", 10, -10);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", 19, -19);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", 20, -20);
+    test("abcdefghijklmnopqrst", 1, 1, "", 0, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcde", 0, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcde", 1, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcde", 2, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcde", 4, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcde", 5, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 0, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 1, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 5, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 9, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 10, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 0, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 1, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 10, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 19, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 20, 1);
+    test("abcdefghijklmnopqrst", 1, 9, "", 0, 9);
+    test("abcdefghijklmnopqrst", 1, 9, "abcde", 0, 9);
+    test("abcdefghijklmnopqrst", 1, 9, "abcde", 1, 1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcde", 2, 1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcde", 4, 1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcde", 5, 1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 0, 9);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 1, 1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 5, 1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 9, 1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 10, 1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 0, 9);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 1, 1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 10, 1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 19, 1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 20, 1);
+    test("abcdefghijklmnopqrst", 1, 18, "", 0, 18);
+    test("abcdefghijklmnopqrst", 1, 18, "abcde", 0, 18);
+    test("abcdefghijklmnopqrst", 1, 18, "abcde", 1, 1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcde", 2, 1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcde", 4, 1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcde", 5, 1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 0, 18);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 1, 1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 5, 1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 9, 1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 10, 1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 0, 18);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 1, 1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 10, 1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 19, 1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 20, 1);
+    test("abcdefghijklmnopqrst", 1, 19, "", 0, 19);
+    test("abcdefghijklmnopqrst", 1, 19, "abcde", 0, 19);
+    test("abcdefghijklmnopqrst", 1, 19, "abcde", 1, 1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcde", 2, 1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcde", 4, 1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcde", 5, 1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 0, 19);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 1, 1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 5, 1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 9, 1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 10, 1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 0, 19);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 1, 1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 10, 1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 19, 1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 20, 1);
+    test("abcdefghijklmnopqrst", 1, 20, "", 0, 19);
+    test("abcdefghijklmnopqrst", 1, 20, "abcde", 0, 19);
+    test("abcdefghijklmnopqrst", 1, 20, "abcde", 1, 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcde", 2, 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcde", 4, 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcde", 5, 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 0, 19);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 1, 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 5, 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 9, 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 10, 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 0, 19);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 1, 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 10, 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 19, 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 20, 1);
+    test("abcdefghijklmnopqrst", 10, 0, "", 0, 0);
+    test("abcdefghijklmnopqrst", 10, 0, "abcde", 0, 0);
+    test("abcdefghijklmnopqrst", 10, 0, "abcde", 1, -1);
+    test("abcdefghijklmnopqrst", 10, 0, "abcde", 2, -2);
+    test("abcdefghijklmnopqrst", 10, 0, "abcde", 4, -4);
+    test("abcdefghijklmnopqrst", 10, 0, "abcde", 5, -5);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", 0, 0);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", 1, -1);
+}
+
+
+void test10()
+{
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", 5, -5);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", 9, -9);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", 10, -10);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", 0, 0);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", 1, -1);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", 10, -10);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", 19, -19);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", 20, -20);
+    test("abcdefghijklmnopqrst", 10, 1, "", 0, 1);
+    test("abcdefghijklmnopqrst", 10, 1, "abcde", 0, 1);
+    test("abcdefghijklmnopqrst", 10, 1, "abcde", 1, 10);
+    test("abcdefghijklmnopqrst", 10, 1, "abcde", 2, 10);
+    test("abcdefghijklmnopqrst", 10, 1, "abcde", 4, 10);
+    test("abcdefghijklmnopqrst", 10, 1, "abcde", 5, 10);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 0, 1);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 1, 10);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 5, 10);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 9, 10);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 10, 10);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 0, 1);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 1, 10);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 10, 10);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 19, 10);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 20, 10);
+    test("abcdefghijklmnopqrst", 10, 5, "", 0, 5);
+    test("abcdefghijklmnopqrst", 10, 5, "abcde", 0, 5);
+    test("abcdefghijklmnopqrst", 10, 5, "abcde", 1, 10);
+    test("abcdefghijklmnopqrst", 10, 5, "abcde", 2, 10);
+    test("abcdefghijklmnopqrst", 10, 5, "abcde", 4, 10);
+    test("abcdefghijklmnopqrst", 10, 5, "abcde", 5, 10);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 0, 5);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 1, 10);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 5, 10);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 9, 10);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 10, 10);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 0, 5);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 1, 10);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 10, 10);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 19, 10);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 20, 10);
+    test("abcdefghijklmnopqrst", 10, 9, "", 0, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcde", 0, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcde", 1, 10);
+    test("abcdefghijklmnopqrst", 10, 9, "abcde", 2, 10);
+    test("abcdefghijklmnopqrst", 10, 9, "abcde", 4, 10);
+    test("abcdefghijklmnopqrst", 10, 9, "abcde", 5, 10);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 0, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 1, 10);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 5, 10);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 9, 10);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 10, 10);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 0, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 1, 10);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 10, 10);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 19, 10);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 20, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "", 0, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcde", 0, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcde", 1, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcde", 2, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcde", 4, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcde", 5, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 0, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 1, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 5, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 9, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 10, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 0, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 1, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 10, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 19, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 20, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "", 0, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcde", 0, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcde", 1, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcde", 2, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcde", 4, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcde", 5, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 0, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 1, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 5, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 9, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 10, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 0, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 1, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 10, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 19, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 20, 10);
+    test("abcdefghijklmnopqrst", 19, 0, "", 0, 0);
+    test("abcdefghijklmnopqrst", 19, 0, "abcde", 0, 0);
+    test("abcdefghijklmnopqrst", 19, 0, "abcde", 1, -1);
+    test("abcdefghijklmnopqrst", 19, 0, "abcde", 2, -2);
+    test("abcdefghijklmnopqrst", 19, 0, "abcde", 4, -4);
+    test("abcdefghijklmnopqrst", 19, 0, "abcde", 5, -5);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", 0, 0);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", 1, -1);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", 5, -5);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", 9, -9);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", 10, -10);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", 0, 0);
+}
+
+
+void test11()
+{
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", 1, -1);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", 10, -10);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", 19, -19);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", 20, -20);
+    test("abcdefghijklmnopqrst", 19, 1, "", 0, 1);
+    test("abcdefghijklmnopqrst", 19, 1, "abcde", 0, 1);
+    test("abcdefghijklmnopqrst", 19, 1, "abcde", 1, 19);
+    test("abcdefghijklmnopqrst", 19, 1, "abcde", 2, 19);
+    test("abcdefghijklmnopqrst", 19, 1, "abcde", 4, 19);
+    test("abcdefghijklmnopqrst", 19, 1, "abcde", 5, 19);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 0, 1);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 1, 19);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 5, 19);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 9, 19);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 10, 19);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 0, 1);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 1, 19);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 10, 19);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 19, 19);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 20, 19);
+    test("abcdefghijklmnopqrst", 19, 2, "", 0, 1);
+    test("abcdefghijklmnopqrst", 19, 2, "abcde", 0, 1);
+    test("abcdefghijklmnopqrst", 19, 2, "abcde", 1, 19);
+    test("abcdefghijklmnopqrst", 19, 2, "abcde", 2, 19);
+    test("abcdefghijklmnopqrst", 19, 2, "abcde", 4, 19);
+    test("abcdefghijklmnopqrst", 19, 2, "abcde", 5, 19);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 0, 1);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 1, 19);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 5, 19);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 9, 19);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 10, 19);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 0, 1);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 1, 19);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 10, 19);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 19, 19);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 20, 19);
+    test("abcdefghijklmnopqrst", 20, 0, "", 0, 0);
+    test("abcdefghijklmnopqrst", 20, 0, "abcde", 0, 0);
+    test("abcdefghijklmnopqrst", 20, 0, "abcde", 1, -1);
+    test("abcdefghijklmnopqrst", 20, 0, "abcde", 2, -2);
+    test("abcdefghijklmnopqrst", 20, 0, "abcde", 4, -4);
+    test("abcdefghijklmnopqrst", 20, 0, "abcde", 5, -5);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", 0, 0);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", 1, -1);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", 5, -5);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", 9, -9);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", 10, -10);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", 0, 0);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", 1, -1);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", 10, -10);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", 19, -19);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", 20, -20);
+    test("abcdefghijklmnopqrst", 20, 1, "", 0, 0);
+    test("abcdefghijklmnopqrst", 20, 1, "abcde", 0, 0);
+    test("abcdefghijklmnopqrst", 20, 1, "abcde", 1, -1);
+    test("abcdefghijklmnopqrst", 20, 1, "abcde", 2, -2);
+    test("abcdefghijklmnopqrst", 20, 1, "abcde", 4, -4);
+    test("abcdefghijklmnopqrst", 20, 1, "abcde", 5, -5);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", 0, 0);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", 1, -1);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", 5, -5);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", 9, -9);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", 10, -10);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", 0, 0);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", 1, -1);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", 10, -10);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", 19, -19);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", 20, -20);
+    test("abcdefghijklmnopqrst", 21, 0, "", 0, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcde", 0, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcde", 1, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcde", 2, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcde", 4, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcde", 5, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 0, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 1, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 5, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 9, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 10, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 0, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 1, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 10, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 19, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 20, 0);
+    }
+
+
+int main () {
+    test0();
+    test1();
+    test2();
+    test3();
+    test4();
+    test5();
+    test6();
+    test7();
+    test8();
+    test9();
+    test10();
+    test11();
+
+    {
+    test("", 0, 0, "abcde", 0, 0);
+    test("", 0, 0, "abcde", 1, -1);
+    test("abcdefghijklmnopqrst", 21, 0, "abcde", 0, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcde", 1, 0);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", 10, -10);
+    }
+
+    {
+    test(L"", 0, 0, L"abcde", 0, 0);
+    test(L"", 0, 0, L"abcde", 1, -1);
+    test(L"abcdefghijklmnopqrst", 21, 0, L"abcde", 0, 0);
+    test(L"abcdefghijklmnopqrst", 21, 0, L"abcde", 1, 0);
+    test(L"abcdefghijklmnopqrst", 10, 0, L"abcdefghij", 10, -10);
+    }
+
+#if TEST_STD_VER >= 11
+    {
+    test(U"", 0, 0, U"abcde", 0, 0);
+    test(U"", 0, 0, U"abcde", 1, -1);
+    test(U"abcdefghijklmnopqrst", 21, 0, U"abcde", 0, 0);
+    test(U"abcdefghijklmnopqrst", 21, 0, U"abcde", 1, 0);
+    test(U"abcdefghijklmnopqrst", 10, 0, U"abcdefghij", 10, -10);
+    }
+
+    {
+    test(U"", 0, 0, U"abcde", 0, 0);
+    test(U"", 0, 0, U"abcde", 1, -1);
+    test(U"abcdefghijklmnopqrst", 21, 0, U"abcde", 0, 0);
+    test(U"abcdefghijklmnopqrst", 21, 0, U"abcde", 1, 0);
+    test(U"abcdefghijklmnopqrst", 10, 0, U"abcdefghij", 10, -10);
+    }
+#endif
+
+#if TEST_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1;
+    constexpr SV  sv2 { "abcdefghijklmnopqrst", 21 };
+    static_assert ( sv1.compare(0, 0, "abcde", 0) == 0, "" );
+    static_assert ( sv1.compare(0, 0, "abcde", 1) == -1, "" );
+    static_assert ( sv2.compare(0, 0, "abcde", 1, 0) == 0, "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.ops/compare.size_size_sv_size_size.pass.cpp

@@ -0,0 +1,5842 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr int compare(size_type pos1, size_type n1, basic_string_view str,
+//             size_type pos2, size_type n2) const;
+
+#include <string_view>
+#include <cassert>
+
+#include "test_macros.h"
+#include "constexpr_char_traits.hpp"
+
+int sign ( int x ) { return x > 0 ? 1 : ( x < 0 ? -1 : 0 ); }
+
+template<typename CharT>
+void test1 ( std::basic_string_view<CharT> sv1, size_t pos1, size_t n1,
+             std::basic_string_view<CharT> sv2, size_t pos2, size_t n2,
+             int expected ) {
+    try {
+        assert (sign( sv1.compare(pos1, n1, sv2, pos2, n2)) == sign(expected));
+        assert(pos1 <= sv1.size() && pos2 <= sv2.size());
+        }
+    catch (const std::out_of_range&) {
+        assert(pos1 > sv1.size() || pos2 > sv2.size());
+        }
+}
+
+
+template<typename CharT>
+void test ( const CharT *s1, size_t pos1, size_t n1,
+            const CharT *s2, size_t pos2, size_t n2,
+            int expected ) {
+    typedef std::basic_string_view<CharT> string_view_t;
+
+    string_view_t sv1 ( s1 );
+    string_view_t sv2 ( s2 );
+    test1(sv1, pos1, n1, sv2, pos2, n2, expected);
+}
+
+void test0()
+{
+    test("", 0, 0, "", 0, 0, 0);
+    test("", 0, 0, "", 0, 1, 0);
+    test("", 0, 0, "", 1, 0, 0);
+    test("", 0, 0, "abcde", 0, 0, 0);
+    test("", 0, 0, "abcde", 0, 1, -1);
+    test("", 0, 0, "abcde", 0, 2, -2);
+    test("", 0, 0, "abcde", 0, 4, -4);
+    test("", 0, 0, "abcde", 0, 5, -5);
+    test("", 0, 0, "abcde", 0, 6, -5);
+    test("", 0, 0, "abcde", 1, 0, 0);
+    test("", 0, 0, "abcde", 1, 1, -1);
+    test("", 0, 0, "abcde", 1, 2, -2);
+    test("", 0, 0, "abcde", 1, 3, -3);
+    test("", 0, 0, "abcde", 1, 4, -4);
+    test("", 0, 0, "abcde", 1, 5, -4);
+    test("", 0, 0, "abcde", 2, 0, 0);
+    test("", 0, 0, "abcde", 2, 1, -1);
+    test("", 0, 0, "abcde", 2, 2, -2);
+    test("", 0, 0, "abcde", 2, 3, -3);
+    test("", 0, 0, "abcde", 2, 4, -3);
+    test("", 0, 0, "abcde", 4, 0, 0);
+    test("", 0, 0, "abcde", 4, 1, -1);
+    test("", 0, 0, "abcde", 4, 2, -1);
+    test("", 0, 0, "abcde", 5, 0, 0);
+    test("", 0, 0, "abcde", 5, 1, 0);
+    test("", 0, 0, "abcde", 6, 0, 0);
+    test("", 0, 0, "abcdefghij", 0, 0, 0);
+    test("", 0, 0, "abcdefghij", 0, 1, -1);
+    test("", 0, 0, "abcdefghij", 0, 5, -5);
+    test("", 0, 0, "abcdefghij", 0, 9, -9);
+    test("", 0, 0, "abcdefghij", 0, 10, -10);
+    test("", 0, 0, "abcdefghij", 0, 11, -10);
+    test("", 0, 0, "abcdefghij", 1, 0, 0);
+    test("", 0, 0, "abcdefghij", 1, 1, -1);
+    test("", 0, 0, "abcdefghij", 1, 4, -4);
+    test("", 0, 0, "abcdefghij", 1, 8, -8);
+    test("", 0, 0, "abcdefghij", 1, 9, -9);
+    test("", 0, 0, "abcdefghij", 1, 10, -9);
+    test("", 0, 0, "abcdefghij", 5, 0, 0);
+    test("", 0, 0, "abcdefghij", 5, 1, -1);
+    test("", 0, 0, "abcdefghij", 5, 2, -2);
+    test("", 0, 0, "abcdefghij", 5, 4, -4);
+    test("", 0, 0, "abcdefghij", 5, 5, -5);
+    test("", 0, 0, "abcdefghij", 5, 6, -5);
+    test("", 0, 0, "abcdefghij", 9, 0, 0);
+    test("", 0, 0, "abcdefghij", 9, 1, -1);
+    test("", 0, 0, "abcdefghij", 9, 2, -1);
+    test("", 0, 0, "abcdefghij", 10, 0, 0);
+    test("", 0, 0, "abcdefghij", 10, 1, 0);
+    test("", 0, 0, "abcdefghij", 11, 0, 0);
+    test("", 0, 0, "abcdefghijklmnopqrst", 0, 0, 0);
+    test("", 0, 0, "abcdefghijklmnopqrst", 0, 1, -1);
+    test("", 0, 0, "abcdefghijklmnopqrst", 0, 10, -10);
+    test("", 0, 0, "abcdefghijklmnopqrst", 0, 19, -19);
+    test("", 0, 0, "abcdefghijklmnopqrst", 0, 20, -20);
+    test("", 0, 0, "abcdefghijklmnopqrst", 0, 21, -20);
+    test("", 0, 0, "abcdefghijklmnopqrst", 1, 0, 0);
+    test("", 0, 0, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("", 0, 0, "abcdefghijklmnopqrst", 1, 9, -9);
+    test("", 0, 0, "abcdefghijklmnopqrst", 1, 18, -18);
+    test("", 0, 0, "abcdefghijklmnopqrst", 1, 19, -19);
+    test("", 0, 0, "abcdefghijklmnopqrst", 1, 20, -19);
+    test("", 0, 0, "abcdefghijklmnopqrst", 10, 0, 0);
+    test("", 0, 0, "abcdefghijklmnopqrst", 10, 1, -1);
+    test("", 0, 0, "abcdefghijklmnopqrst", 10, 5, -5);
+    test("", 0, 0, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("", 0, 0, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("", 0, 0, "abcdefghijklmnopqrst", 10, 11, -10);
+    test("", 0, 0, "abcdefghijklmnopqrst", 19, 0, 0);
+    test("", 0, 0, "abcdefghijklmnopqrst", 19, 1, -1);
+    test("", 0, 0, "abcdefghijklmnopqrst", 19, 2, -1);
+    test("", 0, 0, "abcdefghijklmnopqrst", 20, 0, 0);
+    test("", 0, 0, "abcdefghijklmnopqrst", 20, 1, 0);
+    test("", 0, 0, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("", 0, 1, "", 0, 0, 0);
+    test("", 0, 1, "", 0, 1, 0);
+    test("", 0, 1, "", 1, 0, 0);
+    test("", 0, 1, "abcde", 0, 0, 0);
+    test("", 0, 1, "abcde", 0, 1, -1);
+    test("", 0, 1, "abcde", 0, 2, -2);
+    test("", 0, 1, "abcde", 0, 4, -4);
+    test("", 0, 1, "abcde", 0, 5, -5);
+    test("", 0, 1, "abcde", 0, 6, -5);
+    test("", 0, 1, "abcde", 1, 0, 0);
+    test("", 0, 1, "abcde", 1, 1, -1);
+    test("", 0, 1, "abcde", 1, 2, -2);
+    test("", 0, 1, "abcde", 1, 3, -3);
+    test("", 0, 1, "abcde", 1, 4, -4);
+    test("", 0, 1, "abcde", 1, 5, -4);
+    test("", 0, 1, "abcde", 2, 0, 0);
+    test("", 0, 1, "abcde", 2, 1, -1);
+    test("", 0, 1, "abcde", 2, 2, -2);
+    test("", 0, 1, "abcde", 2, 3, -3);
+    test("", 0, 1, "abcde", 2, 4, -3);
+    test("", 0, 1, "abcde", 4, 0, 0);
+    test("", 0, 1, "abcde", 4, 1, -1);
+    test("", 0, 1, "abcde", 4, 2, -1);
+    test("", 0, 1, "abcde", 5, 0, 0);
+    test("", 0, 1, "abcde", 5, 1, 0);
+    test("", 0, 1, "abcde", 6, 0, 0);
+}
+
+void test1()
+{
+    test("", 0, 1, "abcdefghij", 0, 0, 0);
+    test("", 0, 1, "abcdefghij", 0, 1, -1);
+    test("", 0, 1, "abcdefghij", 0, 5, -5);
+    test("", 0, 1, "abcdefghij", 0, 9, -9);
+    test("", 0, 1, "abcdefghij", 0, 10, -10);
+    test("", 0, 1, "abcdefghij", 0, 11, -10);
+    test("", 0, 1, "abcdefghij", 1, 0, 0);
+    test("", 0, 1, "abcdefghij", 1, 1, -1);
+    test("", 0, 1, "abcdefghij", 1, 4, -4);
+    test("", 0, 1, "abcdefghij", 1, 8, -8);
+    test("", 0, 1, "abcdefghij", 1, 9, -9);
+    test("", 0, 1, "abcdefghij", 1, 10, -9);
+    test("", 0, 1, "abcdefghij", 5, 0, 0);
+    test("", 0, 1, "abcdefghij", 5, 1, -1);
+    test("", 0, 1, "abcdefghij", 5, 2, -2);
+    test("", 0, 1, "abcdefghij", 5, 4, -4);
+    test("", 0, 1, "abcdefghij", 5, 5, -5);
+    test("", 0, 1, "abcdefghij", 5, 6, -5);
+    test("", 0, 1, "abcdefghij", 9, 0, 0);
+    test("", 0, 1, "abcdefghij", 9, 1, -1);
+    test("", 0, 1, "abcdefghij", 9, 2, -1);
+    test("", 0, 1, "abcdefghij", 10, 0, 0);
+    test("", 0, 1, "abcdefghij", 10, 1, 0);
+    test("", 0, 1, "abcdefghij", 11, 0, 0);
+    test("", 0, 1, "abcdefghijklmnopqrst", 0, 0, 0);
+    test("", 0, 1, "abcdefghijklmnopqrst", 0, 1, -1);
+    test("", 0, 1, "abcdefghijklmnopqrst", 0, 10, -10);
+    test("", 0, 1, "abcdefghijklmnopqrst", 0, 19, -19);
+    test("", 0, 1, "abcdefghijklmnopqrst", 0, 20, -20);
+    test("", 0, 1, "abcdefghijklmnopqrst", 0, 21, -20);
+    test("", 0, 1, "abcdefghijklmnopqrst", 1, 0, 0);
+    test("", 0, 1, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("", 0, 1, "abcdefghijklmnopqrst", 1, 9, -9);
+    test("", 0, 1, "abcdefghijklmnopqrst", 1, 18, -18);
+    test("", 0, 1, "abcdefghijklmnopqrst", 1, 19, -19);
+    test("", 0, 1, "abcdefghijklmnopqrst", 1, 20, -19);
+    test("", 0, 1, "abcdefghijklmnopqrst", 10, 0, 0);
+    test("", 0, 1, "abcdefghijklmnopqrst", 10, 1, -1);
+    test("", 0, 1, "abcdefghijklmnopqrst", 10, 5, -5);
+    test("", 0, 1, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("", 0, 1, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("", 0, 1, "abcdefghijklmnopqrst", 10, 11, -10);
+    test("", 0, 1, "abcdefghijklmnopqrst", 19, 0, 0);
+    test("", 0, 1, "abcdefghijklmnopqrst", 19, 1, -1);
+    test("", 0, 1, "abcdefghijklmnopqrst", 19, 2, -1);
+    test("", 0, 1, "abcdefghijklmnopqrst", 20, 0, 0);
+    test("", 0, 1, "abcdefghijklmnopqrst", 20, 1, 0);
+    test("", 0, 1, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("", 1, 0, "", 0, 0, 0);
+    test("", 1, 0, "", 0, 1, 0);
+    test("", 1, 0, "", 1, 0, 0);
+    test("", 1, 0, "abcde", 0, 0, 0);
+    test("", 1, 0, "abcde", 0, 1, 0);
+    test("", 1, 0, "abcde", 0, 2, 0);
+    test("", 1, 0, "abcde", 0, 4, 0);
+    test("", 1, 0, "abcde", 0, 5, 0);
+    test("", 1, 0, "abcde", 0, 6, 0);
+    test("", 1, 0, "abcde", 1, 0, 0);
+    test("", 1, 0, "abcde", 1, 1, 0);
+    test("", 1, 0, "abcde", 1, 2, 0);
+    test("", 1, 0, "abcde", 1, 3, 0);
+    test("", 1, 0, "abcde", 1, 4, 0);
+    test("", 1, 0, "abcde", 1, 5, 0);
+    test("", 1, 0, "abcde", 2, 0, 0);
+    test("", 1, 0, "abcde", 2, 1, 0);
+    test("", 1, 0, "abcde", 2, 2, 0);
+    test("", 1, 0, "abcde", 2, 3, 0);
+    test("", 1, 0, "abcde", 2, 4, 0);
+    test("", 1, 0, "abcde", 4, 0, 0);
+    test("", 1, 0, "abcde", 4, 1, 0);
+    test("", 1, 0, "abcde", 4, 2, 0);
+    test("", 1, 0, "abcde", 5, 0, 0);
+    test("", 1, 0, "abcde", 5, 1, 0);
+    test("", 1, 0, "abcde", 6, 0, 0);
+    test("", 1, 0, "abcdefghij", 0, 0, 0);
+    test("", 1, 0, "abcdefghij", 0, 1, 0);
+    test("", 1, 0, "abcdefghij", 0, 5, 0);
+    test("", 1, 0, "abcdefghij", 0, 9, 0);
+    test("", 1, 0, "abcdefghij", 0, 10, 0);
+    test("", 1, 0, "abcdefghij", 0, 11, 0);
+    test("", 1, 0, "abcdefghij", 1, 0, 0);
+    test("", 1, 0, "abcdefghij", 1, 1, 0);
+    test("", 1, 0, "abcdefghij", 1, 4, 0);
+    test("", 1, 0, "abcdefghij", 1, 8, 0);
+    test("", 1, 0, "abcdefghij", 1, 9, 0);
+    test("", 1, 0, "abcdefghij", 1, 10, 0);
+    test("", 1, 0, "abcdefghij", 5, 0, 0);
+    test("", 1, 0, "abcdefghij", 5, 1, 0);
+    test("", 1, 0, "abcdefghij", 5, 2, 0);
+    test("", 1, 0, "abcdefghij", 5, 4, 0);
+    test("", 1, 0, "abcdefghij", 5, 5, 0);
+    test("", 1, 0, "abcdefghij", 5, 6, 0);
+    test("", 1, 0, "abcdefghij", 9, 0, 0);
+    test("", 1, 0, "abcdefghij", 9, 1, 0);
+    test("", 1, 0, "abcdefghij", 9, 2, 0);
+    test("", 1, 0, "abcdefghij", 10, 0, 0);
+    test("", 1, 0, "abcdefghij", 10, 1, 0);
+    test("", 1, 0, "abcdefghij", 11, 0, 0);
+    test("", 1, 0, "abcdefghijklmnopqrst", 0, 0, 0);
+    test("", 1, 0, "abcdefghijklmnopqrst", 0, 1, 0);
+}
+
+void test2()
+{
+    test("", 1, 0, "abcdefghijklmnopqrst", 0, 10, 0);
+    test("", 1, 0, "abcdefghijklmnopqrst", 0, 19, 0);
+    test("", 1, 0, "abcdefghijklmnopqrst", 0, 20, 0);
+    test("", 1, 0, "abcdefghijklmnopqrst", 0, 21, 0);
+    test("", 1, 0, "abcdefghijklmnopqrst", 1, 0, 0);
+    test("", 1, 0, "abcdefghijklmnopqrst", 1, 1, 0);
+    test("", 1, 0, "abcdefghijklmnopqrst", 1, 9, 0);
+    test("", 1, 0, "abcdefghijklmnopqrst", 1, 18, 0);
+    test("", 1, 0, "abcdefghijklmnopqrst", 1, 19, 0);
+    test("", 1, 0, "abcdefghijklmnopqrst", 1, 20, 0);
+    test("", 1, 0, "abcdefghijklmnopqrst", 10, 0, 0);
+    test("", 1, 0, "abcdefghijklmnopqrst", 10, 1, 0);
+    test("", 1, 0, "abcdefghijklmnopqrst", 10, 5, 0);
+    test("", 1, 0, "abcdefghijklmnopqrst", 10, 9, 0);
+    test("", 1, 0, "abcdefghijklmnopqrst", 10, 10, 0);
+    test("", 1, 0, "abcdefghijklmnopqrst", 10, 11, 0);
+    test("", 1, 0, "abcdefghijklmnopqrst", 19, 0, 0);
+    test("", 1, 0, "abcdefghijklmnopqrst", 19, 1, 0);
+    test("", 1, 0, "abcdefghijklmnopqrst", 19, 2, 0);
+    test("", 1, 0, "abcdefghijklmnopqrst", 20, 0, 0);
+    test("", 1, 0, "abcdefghijklmnopqrst", 20, 1, 0);
+    test("", 1, 0, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcde", 0, 0, "", 0, 0, 0);
+    test("abcde", 0, 0, "", 0, 1, 0);
+    test("abcde", 0, 0, "", 1, 0, 0);
+    test("abcde", 0, 0, "abcde", 0, 0, 0);
+    test("abcde", 0, 0, "abcde", 0, 1, -1);
+    test("abcde", 0, 0, "abcde", 0, 2, -2);
+    test("abcde", 0, 0, "abcde", 0, 4, -4);
+    test("abcde", 0, 0, "abcde", 0, 5, -5);
+    test("abcde", 0, 0, "abcde", 0, 6, -5);
+    test("abcde", 0, 0, "abcde", 1, 0, 0);
+    test("abcde", 0, 0, "abcde", 1, 1, -1);
+    test("abcde", 0, 0, "abcde", 1, 2, -2);
+    test("abcde", 0, 0, "abcde", 1, 3, -3);
+    test("abcde", 0, 0, "abcde", 1, 4, -4);
+    test("abcde", 0, 0, "abcde", 1, 5, -4);
+    test("abcde", 0, 0, "abcde", 2, 0, 0);
+    test("abcde", 0, 0, "abcde", 2, 1, -1);
+    test("abcde", 0, 0, "abcde", 2, 2, -2);
+    test("abcde", 0, 0, "abcde", 2, 3, -3);
+    test("abcde", 0, 0, "abcde", 2, 4, -3);
+    test("abcde", 0, 0, "abcde", 4, 0, 0);
+    test("abcde", 0, 0, "abcde", 4, 1, -1);
+    test("abcde", 0, 0, "abcde", 4, 2, -1);
+    test("abcde", 0, 0, "abcde", 5, 0, 0);
+    test("abcde", 0, 0, "abcde", 5, 1, 0);
+    test("abcde", 0, 0, "abcde", 6, 0, 0);
+    test("abcde", 0, 0, "abcdefghij", 0, 0, 0);
+    test("abcde", 0, 0, "abcdefghij", 0, 1, -1);
+    test("abcde", 0, 0, "abcdefghij", 0, 5, -5);
+    test("abcde", 0, 0, "abcdefghij", 0, 9, -9);
+    test("abcde", 0, 0, "abcdefghij", 0, 10, -10);
+    test("abcde", 0, 0, "abcdefghij", 0, 11, -10);
+    test("abcde", 0, 0, "abcdefghij", 1, 0, 0);
+    test("abcde", 0, 0, "abcdefghij", 1, 1, -1);
+    test("abcde", 0, 0, "abcdefghij", 1, 4, -4);
+    test("abcde", 0, 0, "abcdefghij", 1, 8, -8);
+    test("abcde", 0, 0, "abcdefghij", 1, 9, -9);
+    test("abcde", 0, 0, "abcdefghij", 1, 10, -9);
+    test("abcde", 0, 0, "abcdefghij", 5, 0, 0);
+    test("abcde", 0, 0, "abcdefghij", 5, 1, -1);
+    test("abcde", 0, 0, "abcdefghij", 5, 2, -2);
+    test("abcde", 0, 0, "abcdefghij", 5, 4, -4);
+    test("abcde", 0, 0, "abcdefghij", 5, 5, -5);
+    test("abcde", 0, 0, "abcdefghij", 5, 6, -5);
+    test("abcde", 0, 0, "abcdefghij", 9, 0, 0);
+    test("abcde", 0, 0, "abcdefghij", 9, 1, -1);
+    test("abcde", 0, 0, "abcdefghij", 9, 2, -1);
+    test("abcde", 0, 0, "abcdefghij", 10, 0, 0);
+    test("abcde", 0, 0, "abcdefghij", 10, 1, 0);
+    test("abcde", 0, 0, "abcdefghij", 11, 0, 0);
+    test("abcde", 0, 0, "abcdefghijklmnopqrst", 0, 0, 0);
+    test("abcde", 0, 0, "abcdefghijklmnopqrst", 0, 1, -1);
+    test("abcde", 0, 0, "abcdefghijklmnopqrst", 0, 10, -10);
+    test("abcde", 0, 0, "abcdefghijklmnopqrst", 0, 19, -19);
+    test("abcde", 0, 0, "abcdefghijklmnopqrst", 0, 20, -20);
+    test("abcde", 0, 0, "abcdefghijklmnopqrst", 0, 21, -20);
+    test("abcde", 0, 0, "abcdefghijklmnopqrst", 1, 0, 0);
+    test("abcde", 0, 0, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("abcde", 0, 0, "abcdefghijklmnopqrst", 1, 9, -9);
+    test("abcde", 0, 0, "abcdefghijklmnopqrst", 1, 18, -18);
+    test("abcde", 0, 0, "abcdefghijklmnopqrst", 1, 19, -19);
+    test("abcde", 0, 0, "abcdefghijklmnopqrst", 1, 20, -19);
+    test("abcde", 0, 0, "abcdefghijklmnopqrst", 10, 0, 0);
+    test("abcde", 0, 0, "abcdefghijklmnopqrst", 10, 1, -1);
+    test("abcde", 0, 0, "abcdefghijklmnopqrst", 10, 5, -5);
+    test("abcde", 0, 0, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("abcde", 0, 0, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("abcde", 0, 0, "abcdefghijklmnopqrst", 10, 11, -10);
+    test("abcde", 0, 0, "abcdefghijklmnopqrst", 19, 0, 0);
+    test("abcde", 0, 0, "abcdefghijklmnopqrst", 19, 1, -1);
+    test("abcde", 0, 0, "abcdefghijklmnopqrst", 19, 2, -1);
+    test("abcde", 0, 0, "abcdefghijklmnopqrst", 20, 0, 0);
+    test("abcde", 0, 0, "abcdefghijklmnopqrst", 20, 1, 0);
+    test("abcde", 0, 0, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcde", 0, 1, "", 0, 0, 1);
+    test("abcde", 0, 1, "", 0, 1, 1);
+    test("abcde", 0, 1, "", 1, 0, 0);
+    test("abcde", 0, 1, "abcde", 0, 0, 1);
+}
+
+void test3()
+{
+    test("abcde", 0, 1, "abcde", 0, 1, 0);
+    test("abcde", 0, 1, "abcde", 0, 2, -1);
+    test("abcde", 0, 1, "abcde", 0, 4, -3);
+    test("abcde", 0, 1, "abcde", 0, 5, -4);
+    test("abcde", 0, 1, "abcde", 0, 6, -4);
+    test("abcde", 0, 1, "abcde", 1, 0, 1);
+    test("abcde", 0, 1, "abcde", 1, 1, -1);
+    test("abcde", 0, 1, "abcde", 1, 2, -1);
+    test("abcde", 0, 1, "abcde", 1, 3, -1);
+    test("abcde", 0, 1, "abcde", 1, 4, -1);
+    test("abcde", 0, 1, "abcde", 1, 5, -1);
+    test("abcde", 0, 1, "abcde", 2, 0, 1);
+    test("abcde", 0, 1, "abcde", 2, 1, -2);
+    test("abcde", 0, 1, "abcde", 2, 2, -2);
+    test("abcde", 0, 1, "abcde", 2, 3, -2);
+    test("abcde", 0, 1, "abcde", 2, 4, -2);
+    test("abcde", 0, 1, "abcde", 4, 0, 1);
+    test("abcde", 0, 1, "abcde", 4, 1, -4);
+    test("abcde", 0, 1, "abcde", 4, 2, -4);
+    test("abcde", 0, 1, "abcde", 5, 0, 1);
+    test("abcde", 0, 1, "abcde", 5, 1, 1);
+    test("abcde", 0, 1, "abcde", 6, 0, 0);
+    test("abcde", 0, 1, "abcdefghij", 0, 0, 1);
+    test("abcde", 0, 1, "abcdefghij", 0, 1, 0);
+    test("abcde", 0, 1, "abcdefghij", 0, 5, -4);
+    test("abcde", 0, 1, "abcdefghij", 0, 9, -8);
+    test("abcde", 0, 1, "abcdefghij", 0, 10, -9);
+    test("abcde", 0, 1, "abcdefghij", 0, 11, -9);
+    test("abcde", 0, 1, "abcdefghij", 1, 0, 1);
+    test("abcde", 0, 1, "abcdefghij", 1, 1, -1);
+    test("abcde", 0, 1, "abcdefghij", 1, 4, -1);
+    test("abcde", 0, 1, "abcdefghij", 1, 8, -1);
+    test("abcde", 0, 1, "abcdefghij", 1, 9, -1);
+    test("abcde", 0, 1, "abcdefghij", 1, 10, -1);
+    test("abcde", 0, 1, "abcdefghij", 5, 0, 1);
+    test("abcde", 0, 1, "abcdefghij", 5, 1, -5);
+    test("abcde", 0, 1, "abcdefghij", 5, 2, -5);
+    test("abcde", 0, 1, "abcdefghij", 5, 4, -5);
+    test("abcde", 0, 1, "abcdefghij", 5, 5, -5);
+    test("abcde", 0, 1, "abcdefghij", 5, 6, -5);
+    test("abcde", 0, 1, "abcdefghij", 9, 0, 1);
+    test("abcde", 0, 1, "abcdefghij", 9, 1, -9);
+    test("abcde", 0, 1, "abcdefghij", 9, 2, -9);
+    test("abcde", 0, 1, "abcdefghij", 10, 0, 1);
+    test("abcde", 0, 1, "abcdefghij", 10, 1, 1);
+    test("abcde", 0, 1, "abcdefghij", 11, 0, 0);
+    test("abcde", 0, 1, "abcdefghijklmnopqrst", 0, 0, 1);
+    test("abcde", 0, 1, "abcdefghijklmnopqrst", 0, 1, 0);
+    test("abcde", 0, 1, "abcdefghijklmnopqrst", 0, 10, -9);
+    test("abcde", 0, 1, "abcdefghijklmnopqrst", 0, 19, -18);
+    test("abcde", 0, 1, "abcdefghijklmnopqrst", 0, 20, -19);
+    test("abcde", 0, 1, "abcdefghijklmnopqrst", 0, 21, -19);
+    test("abcde", 0, 1, "abcdefghijklmnopqrst", 1, 0, 1);
+    test("abcde", 0, 1, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("abcde", 0, 1, "abcdefghijklmnopqrst", 1, 9, -1);
+    test("abcde", 0, 1, "abcdefghijklmnopqrst", 1, 18, -1);
+    test("abcde", 0, 1, "abcdefghijklmnopqrst", 1, 19, -1);
+    test("abcde", 0, 1, "abcdefghijklmnopqrst", 1, 20, -1);
+    test("abcde", 0, 1, "abcdefghijklmnopqrst", 10, 0, 1);
+    test("abcde", 0, 1, "abcdefghijklmnopqrst", 10, 1, -10);
+    test("abcde", 0, 1, "abcdefghijklmnopqrst", 10, 5, -10);
+    test("abcde", 0, 1, "abcdefghijklmnopqrst", 10, 9, -10);
+    test("abcde", 0, 1, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("abcde", 0, 1, "abcdefghijklmnopqrst", 10, 11, -10);
+    test("abcde", 0, 1, "abcdefghijklmnopqrst", 19, 0, 1);
+    test("abcde", 0, 1, "abcdefghijklmnopqrst", 19, 1, -19);
+    test("abcde", 0, 1, "abcdefghijklmnopqrst", 19, 2, -19);
+    test("abcde", 0, 1, "abcdefghijklmnopqrst", 20, 0, 1);
+    test("abcde", 0, 1, "abcdefghijklmnopqrst", 20, 1, 1);
+    test("abcde", 0, 1, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcde", 0, 2, "", 0, 0, 2);
+    test("abcde", 0, 2, "", 0, 1, 2);
+    test("abcde", 0, 2, "", 1, 0, 0);
+    test("abcde", 0, 2, "abcde", 0, 0, 2);
+    test("abcde", 0, 2, "abcde", 0, 1, 1);
+    test("abcde", 0, 2, "abcde", 0, 2, 0);
+    test("abcde", 0, 2, "abcde", 0, 4, -2);
+    test("abcde", 0, 2, "abcde", 0, 5, -3);
+    test("abcde", 0, 2, "abcde", 0, 6, -3);
+    test("abcde", 0, 2, "abcde", 1, 0, 2);
+    test("abcde", 0, 2, "abcde", 1, 1, -1);
+    test("abcde", 0, 2, "abcde", 1, 2, -1);
+    test("abcde", 0, 2, "abcde", 1, 3, -1);
+    test("abcde", 0, 2, "abcde", 1, 4, -1);
+    test("abcde", 0, 2, "abcde", 1, 5, -1);
+    test("abcde", 0, 2, "abcde", 2, 0, 2);
+    test("abcde", 0, 2, "abcde", 2, 1, -2);
+    test("abcde", 0, 2, "abcde", 2, 2, -2);
+    test("abcde", 0, 2, "abcde", 2, 3, -2);
+    test("abcde", 0, 2, "abcde", 2, 4, -2);
+    test("abcde", 0, 2, "abcde", 4, 0, 2);
+    test("abcde", 0, 2, "abcde", 4, 1, -4);
+    test("abcde", 0, 2, "abcde", 4, 2, -4);
+    test("abcde", 0, 2, "abcde", 5, 0, 2);
+    test("abcde", 0, 2, "abcde", 5, 1, 2);
+    test("abcde", 0, 2, "abcde", 6, 0, 0);
+    test("abcde", 0, 2, "abcdefghij", 0, 0, 2);
+    test("abcde", 0, 2, "abcdefghij", 0, 1, 1);
+    test("abcde", 0, 2, "abcdefghij", 0, 5, -3);
+    test("abcde", 0, 2, "abcdefghij", 0, 9, -7);
+}
+
+void test4()
+{
+    test("abcde", 0, 2, "abcdefghij", 0, 10, -8);
+    test("abcde", 0, 2, "abcdefghij", 0, 11, -8);
+    test("abcde", 0, 2, "abcdefghij", 1, 0, 2);
+    test("abcde", 0, 2, "abcdefghij", 1, 1, -1);
+    test("abcde", 0, 2, "abcdefghij", 1, 4, -1);
+    test("abcde", 0, 2, "abcdefghij", 1, 8, -1);
+    test("abcde", 0, 2, "abcdefghij", 1, 9, -1);
+    test("abcde", 0, 2, "abcdefghij", 1, 10, -1);
+    test("abcde", 0, 2, "abcdefghij", 5, 0, 2);
+    test("abcde", 0, 2, "abcdefghij", 5, 1, -5);
+    test("abcde", 0, 2, "abcdefghij", 5, 2, -5);
+    test("abcde", 0, 2, "abcdefghij", 5, 4, -5);
+    test("abcde", 0, 2, "abcdefghij", 5, 5, -5);
+    test("abcde", 0, 2, "abcdefghij", 5, 6, -5);
+    test("abcde", 0, 2, "abcdefghij", 9, 0, 2);
+    test("abcde", 0, 2, "abcdefghij", 9, 1, -9);
+    test("abcde", 0, 2, "abcdefghij", 9, 2, -9);
+    test("abcde", 0, 2, "abcdefghij", 10, 0, 2);
+    test("abcde", 0, 2, "abcdefghij", 10, 1, 2);
+    test("abcde", 0, 2, "abcdefghij", 11, 0, 0);
+    test("abcde", 0, 2, "abcdefghijklmnopqrst", 0, 0, 2);
+    test("abcde", 0, 2, "abcdefghijklmnopqrst", 0, 1, 1);
+    test("abcde", 0, 2, "abcdefghijklmnopqrst", 0, 10, -8);
+    test("abcde", 0, 2, "abcdefghijklmnopqrst", 0, 19, -17);
+    test("abcde", 0, 2, "abcdefghijklmnopqrst", 0, 20, -18);
+    test("abcde", 0, 2, "abcdefghijklmnopqrst", 0, 21, -18);
+    test("abcde", 0, 2, "abcdefghijklmnopqrst", 1, 0, 2);
+    test("abcde", 0, 2, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("abcde", 0, 2, "abcdefghijklmnopqrst", 1, 9, -1);
+    test("abcde", 0, 2, "abcdefghijklmnopqrst", 1, 18, -1);
+    test("abcde", 0, 2, "abcdefghijklmnopqrst", 1, 19, -1);
+    test("abcde", 0, 2, "abcdefghijklmnopqrst", 1, 20, -1);
+    test("abcde", 0, 2, "abcdefghijklmnopqrst", 10, 0, 2);
+    test("abcde", 0, 2, "abcdefghijklmnopqrst", 10, 1, -10);
+    test("abcde", 0, 2, "abcdefghijklmnopqrst", 10, 5, -10);
+    test("abcde", 0, 2, "abcdefghijklmnopqrst", 10, 9, -10);
+    test("abcde", 0, 2, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("abcde", 0, 2, "abcdefghijklmnopqrst", 10, 11, -10);
+    test("abcde", 0, 2, "abcdefghijklmnopqrst", 19, 0, 2);
+    test("abcde", 0, 2, "abcdefghijklmnopqrst", 19, 1, -19);
+    test("abcde", 0, 2, "abcdefghijklmnopqrst", 19, 2, -19);
+    test("abcde", 0, 2, "abcdefghijklmnopqrst", 20, 0, 2);
+    test("abcde", 0, 2, "abcdefghijklmnopqrst", 20, 1, 2);
+    test("abcde", 0, 2, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcde", 0, 4, "", 0, 0, 4);
+    test("abcde", 0, 4, "", 0, 1, 4);
+    test("abcde", 0, 4, "", 1, 0, 0);
+    test("abcde", 0, 4, "abcde", 0, 0, 4);
+    test("abcde", 0, 4, "abcde", 0, 1, 3);
+    test("abcde", 0, 4, "abcde", 0, 2, 2);
+    test("abcde", 0, 4, "abcde", 0, 4, 0);
+    test("abcde", 0, 4, "abcde", 0, 5, -1);
+    test("abcde", 0, 4, "abcde", 0, 6, -1);
+    test("abcde", 0, 4, "abcde", 1, 0, 4);
+    test("abcde", 0, 4, "abcde", 1, 1, -1);
+    test("abcde", 0, 4, "abcde", 1, 2, -1);
+    test("abcde", 0, 4, "abcde", 1, 3, -1);
+    test("abcde", 0, 4, "abcde", 1, 4, -1);
+    test("abcde", 0, 4, "abcde", 1, 5, -1);
+    test("abcde", 0, 4, "abcde", 2, 0, 4);
+    test("abcde", 0, 4, "abcde", 2, 1, -2);
+    test("abcde", 0, 4, "abcde", 2, 2, -2);
+    test("abcde", 0, 4, "abcde", 2, 3, -2);
+    test("abcde", 0, 4, "abcde", 2, 4, -2);
+    test("abcde", 0, 4, "abcde", 4, 0, 4);
+    test("abcde", 0, 4, "abcde", 4, 1, -4);
+    test("abcde", 0, 4, "abcde", 4, 2, -4);
+    test("abcde", 0, 4, "abcde", 5, 0, 4);
+    test("abcde", 0, 4, "abcde", 5, 1, 4);
+    test("abcde", 0, 4, "abcde", 6, 0, 0);
+    test("abcde", 0, 4, "abcdefghij", 0, 0, 4);
+    test("abcde", 0, 4, "abcdefghij", 0, 1, 3);
+    test("abcde", 0, 4, "abcdefghij", 0, 5, -1);
+    test("abcde", 0, 4, "abcdefghij", 0, 9, -5);
+    test("abcde", 0, 4, "abcdefghij", 0, 10, -6);
+    test("abcde", 0, 4, "abcdefghij", 0, 11, -6);
+    test("abcde", 0, 4, "abcdefghij", 1, 0, 4);
+    test("abcde", 0, 4, "abcdefghij", 1, 1, -1);
+    test("abcde", 0, 4, "abcdefghij", 1, 4, -1);
+    test("abcde", 0, 4, "abcdefghij", 1, 8, -1);
+    test("abcde", 0, 4, "abcdefghij", 1, 9, -1);
+    test("abcde", 0, 4, "abcdefghij", 1, 10, -1);
+    test("abcde", 0, 4, "abcdefghij", 5, 0, 4);
+    test("abcde", 0, 4, "abcdefghij", 5, 1, -5);
+    test("abcde", 0, 4, "abcdefghij", 5, 2, -5);
+    test("abcde", 0, 4, "abcdefghij", 5, 4, -5);
+    test("abcde", 0, 4, "abcdefghij", 5, 5, -5);
+    test("abcde", 0, 4, "abcdefghij", 5, 6, -5);
+    test("abcde", 0, 4, "abcdefghij", 9, 0, 4);
+    test("abcde", 0, 4, "abcdefghij", 9, 1, -9);
+    test("abcde", 0, 4, "abcdefghij", 9, 2, -9);
+    test("abcde", 0, 4, "abcdefghij", 10, 0, 4);
+    test("abcde", 0, 4, "abcdefghij", 10, 1, 4);
+    test("abcde", 0, 4, "abcdefghij", 11, 0, 0);
+    test("abcde", 0, 4, "abcdefghijklmnopqrst", 0, 0, 4);
+    test("abcde", 0, 4, "abcdefghijklmnopqrst", 0, 1, 3);
+    test("abcde", 0, 4, "abcdefghijklmnopqrst", 0, 10, -6);
+    test("abcde", 0, 4, "abcdefghijklmnopqrst", 0, 19, -15);
+    test("abcde", 0, 4, "abcdefghijklmnopqrst", 0, 20, -16);
+    test("abcde", 0, 4, "abcdefghijklmnopqrst", 0, 21, -16);
+}
+
+void test5()
+{
+    test("abcde", 0, 4, "abcdefghijklmnopqrst", 1, 0, 4);
+    test("abcde", 0, 4, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("abcde", 0, 4, "abcdefghijklmnopqrst", 1, 9, -1);
+    test("abcde", 0, 4, "abcdefghijklmnopqrst", 1, 18, -1);
+    test("abcde", 0, 4, "abcdefghijklmnopqrst", 1, 19, -1);
+    test("abcde", 0, 4, "abcdefghijklmnopqrst", 1, 20, -1);
+    test("abcde", 0, 4, "abcdefghijklmnopqrst", 10, 0, 4);
+    test("abcde", 0, 4, "abcdefghijklmnopqrst", 10, 1, -10);
+    test("abcde", 0, 4, "abcdefghijklmnopqrst", 10, 5, -10);
+    test("abcde", 0, 4, "abcdefghijklmnopqrst", 10, 9, -10);
+    test("abcde", 0, 4, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("abcde", 0, 4, "abcdefghijklmnopqrst", 10, 11, -10);
+    test("abcde", 0, 4, "abcdefghijklmnopqrst", 19, 0, 4);
+    test("abcde", 0, 4, "abcdefghijklmnopqrst", 19, 1, -19);
+    test("abcde", 0, 4, "abcdefghijklmnopqrst", 19, 2, -19);
+    test("abcde", 0, 4, "abcdefghijklmnopqrst", 20, 0, 4);
+    test("abcde", 0, 4, "abcdefghijklmnopqrst", 20, 1, 4);
+    test("abcde", 0, 4, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcde", 0, 5, "", 0, 0, 5);
+    test("abcde", 0, 5, "", 0, 1, 5);
+    test("abcde", 0, 5, "", 1, 0, 0);
+    test("abcde", 0, 5, "abcde", 0, 0, 5);
+    test("abcde", 0, 5, "abcde", 0, 1, 4);
+    test("abcde", 0, 5, "abcde", 0, 2, 3);
+    test("abcde", 0, 5, "abcde", 0, 4, 1);
+    test("abcde", 0, 5, "abcde", 0, 5, 0);
+    test("abcde", 0, 5, "abcde", 0, 6, 0);
+    test("abcde", 0, 5, "abcde", 1, 0, 5);
+    test("abcde", 0, 5, "abcde", 1, 1, -1);
+    test("abcde", 0, 5, "abcde", 1, 2, -1);
+    test("abcde", 0, 5, "abcde", 1, 3, -1);
+    test("abcde", 0, 5, "abcde", 1, 4, -1);
+    test("abcde", 0, 5, "abcde", 1, 5, -1);
+    test("abcde", 0, 5, "abcde", 2, 0, 5);
+    test("abcde", 0, 5, "abcde", 2, 1, -2);
+    test("abcde", 0, 5, "abcde", 2, 2, -2);
+    test("abcde", 0, 5, "abcde", 2, 3, -2);
+    test("abcde", 0, 5, "abcde", 2, 4, -2);
+    test("abcde", 0, 5, "abcde", 4, 0, 5);
+    test("abcde", 0, 5, "abcde", 4, 1, -4);
+    test("abcde", 0, 5, "abcde", 4, 2, -4);
+    test("abcde", 0, 5, "abcde", 5, 0, 5);
+    test("abcde", 0, 5, "abcde", 5, 1, 5);
+    test("abcde", 0, 5, "abcde", 6, 0, 0);
+    test("abcde", 0, 5, "abcdefghij", 0, 0, 5);
+    test("abcde", 0, 5, "abcdefghij", 0, 1, 4);
+    test("abcde", 0, 5, "abcdefghij", 0, 5, 0);
+    test("abcde", 0, 5, "abcdefghij", 0, 9, -4);
+    test("abcde", 0, 5, "abcdefghij", 0, 10, -5);
+    test("abcde", 0, 5, "abcdefghij", 0, 11, -5);
+    test("abcde", 0, 5, "abcdefghij", 1, 0, 5);
+    test("abcde", 0, 5, "abcdefghij", 1, 1, -1);
+    test("abcde", 0, 5, "abcdefghij", 1, 4, -1);
+    test("abcde", 0, 5, "abcdefghij", 1, 8, -1);
+    test("abcde", 0, 5, "abcdefghij", 1, 9, -1);
+    test("abcde", 0, 5, "abcdefghij", 1, 10, -1);
+    test("abcde", 0, 5, "abcdefghij", 5, 0, 5);
+    test("abcde", 0, 5, "abcdefghij", 5, 1, -5);
+    test("abcde", 0, 5, "abcdefghij", 5, 2, -5);
+    test("abcde", 0, 5, "abcdefghij", 5, 4, -5);
+    test("abcde", 0, 5, "abcdefghij", 5, 5, -5);
+    test("abcde", 0, 5, "abcdefghij", 5, 6, -5);
+    test("abcde", 0, 5, "abcdefghij", 9, 0, 5);
+    test("abcde", 0, 5, "abcdefghij", 9, 1, -9);
+    test("abcde", 0, 5, "abcdefghij", 9, 2, -9);
+    test("abcde", 0, 5, "abcdefghij", 10, 0, 5);
+    test("abcde", 0, 5, "abcdefghij", 10, 1, 5);
+    test("abcde", 0, 5, "abcdefghij", 11, 0, 0);
+    test("abcde", 0, 5, "abcdefghijklmnopqrst", 0, 0, 5);
+    test("abcde", 0, 5, "abcdefghijklmnopqrst", 0, 1, 4);
+    test("abcde", 0, 5, "abcdefghijklmnopqrst", 0, 10, -5);
+    test("abcde", 0, 5, "abcdefghijklmnopqrst", 0, 19, -14);
+    test("abcde", 0, 5, "abcdefghijklmnopqrst", 0, 20, -15);
+    test("abcde", 0, 5, "abcdefghijklmnopqrst", 0, 21, -15);
+    test("abcde", 0, 5, "abcdefghijklmnopqrst", 1, 0, 5);
+    test("abcde", 0, 5, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("abcde", 0, 5, "abcdefghijklmnopqrst", 1, 9, -1);
+    test("abcde", 0, 5, "abcdefghijklmnopqrst", 1, 18, -1);
+    test("abcde", 0, 5, "abcdefghijklmnopqrst", 1, 19, -1);
+    test("abcde", 0, 5, "abcdefghijklmnopqrst", 1, 20, -1);
+    test("abcde", 0, 5, "abcdefghijklmnopqrst", 10, 0, 5);
+    test("abcde", 0, 5, "abcdefghijklmnopqrst", 10, 1, -10);
+    test("abcde", 0, 5, "abcdefghijklmnopqrst", 10, 5, -10);
+    test("abcde", 0, 5, "abcdefghijklmnopqrst", 10, 9, -10);
+    test("abcde", 0, 5, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("abcde", 0, 5, "abcdefghijklmnopqrst", 10, 11, -10);
+    test("abcde", 0, 5, "abcdefghijklmnopqrst", 19, 0, 5);
+    test("abcde", 0, 5, "abcdefghijklmnopqrst", 19, 1, -19);
+    test("abcde", 0, 5, "abcdefghijklmnopqrst", 19, 2, -19);
+    test("abcde", 0, 5, "abcdefghijklmnopqrst", 20, 0, 5);
+    test("abcde", 0, 5, "abcdefghijklmnopqrst", 20, 1, 5);
+    test("abcde", 0, 5, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcde", 0, 6, "", 0, 0, 5);
+    test("abcde", 0, 6, "", 0, 1, 5);
+    test("abcde", 0, 6, "", 1, 0, 0);
+    test("abcde", 0, 6, "abcde", 0, 0, 5);
+    test("abcde", 0, 6, "abcde", 0, 1, 4);
+    test("abcde", 0, 6, "abcde", 0, 2, 3);
+    test("abcde", 0, 6, "abcde", 0, 4, 1);
+    test("abcde", 0, 6, "abcde", 0, 5, 0);
+}
+
+void test6()
+{
+    test("abcde", 0, 6, "abcde", 0, 6, 0);
+    test("abcde", 0, 6, "abcde", 1, 0, 5);
+    test("abcde", 0, 6, "abcde", 1, 1, -1);
+    test("abcde", 0, 6, "abcde", 1, 2, -1);
+    test("abcde", 0, 6, "abcde", 1, 3, -1);
+    test("abcde", 0, 6, "abcde", 1, 4, -1);
+    test("abcde", 0, 6, "abcde", 1, 5, -1);
+    test("abcde", 0, 6, "abcde", 2, 0, 5);
+    test("abcde", 0, 6, "abcde", 2, 1, -2);
+    test("abcde", 0, 6, "abcde", 2, 2, -2);
+    test("abcde", 0, 6, "abcde", 2, 3, -2);
+    test("abcde", 0, 6, "abcde", 2, 4, -2);
+    test("abcde", 0, 6, "abcde", 4, 0, 5);
+    test("abcde", 0, 6, "abcde", 4, 1, -4);
+    test("abcde", 0, 6, "abcde", 4, 2, -4);
+    test("abcde", 0, 6, "abcde", 5, 0, 5);
+    test("abcde", 0, 6, "abcde", 5, 1, 5);
+    test("abcde", 0, 6, "abcde", 6, 0, 0);
+    test("abcde", 0, 6, "abcdefghij", 0, 0, 5);
+    test("abcde", 0, 6, "abcdefghij", 0, 1, 4);
+    test("abcde", 0, 6, "abcdefghij", 0, 5, 0);
+    test("abcde", 0, 6, "abcdefghij", 0, 9, -4);
+    test("abcde", 0, 6, "abcdefghij", 0, 10, -5);
+    test("abcde", 0, 6, "abcdefghij", 0, 11, -5);
+    test("abcde", 0, 6, "abcdefghij", 1, 0, 5);
+    test("abcde", 0, 6, "abcdefghij", 1, 1, -1);
+    test("abcde", 0, 6, "abcdefghij", 1, 4, -1);
+    test("abcde", 0, 6, "abcdefghij", 1, 8, -1);
+    test("abcde", 0, 6, "abcdefghij", 1, 9, -1);
+    test("abcde", 0, 6, "abcdefghij", 1, 10, -1);
+    test("abcde", 0, 6, "abcdefghij", 5, 0, 5);
+    test("abcde", 0, 6, "abcdefghij", 5, 1, -5);
+    test("abcde", 0, 6, "abcdefghij", 5, 2, -5);
+    test("abcde", 0, 6, "abcdefghij", 5, 4, -5);
+    test("abcde", 0, 6, "abcdefghij", 5, 5, -5);
+    test("abcde", 0, 6, "abcdefghij", 5, 6, -5);
+    test("abcde", 0, 6, "abcdefghij", 9, 0, 5);
+    test("abcde", 0, 6, "abcdefghij", 9, 1, -9);
+    test("abcde", 0, 6, "abcdefghij", 9, 2, -9);
+    test("abcde", 0, 6, "abcdefghij", 10, 0, 5);
+    test("abcde", 0, 6, "abcdefghij", 10, 1, 5);
+    test("abcde", 0, 6, "abcdefghij", 11, 0, 0);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", 0, 0, 5);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", 0, 1, 4);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", 0, 10, -5);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", 0, 19, -14);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", 0, 20, -15);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", 0, 21, -15);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", 1, 0, 5);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", 1, 9, -1);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", 1, 18, -1);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", 1, 19, -1);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", 1, 20, -1);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", 10, 0, 5);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", 10, 1, -10);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", 10, 5, -10);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", 10, 9, -10);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", 10, 11, -10);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", 19, 0, 5);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", 19, 1, -19);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", 19, 2, -19);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", 20, 0, 5);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", 20, 1, 5);
+    test("abcde", 0, 6, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcde", 1, 0, "", 0, 0, 0);
+    test("abcde", 1, 0, "", 0, 1, 0);
+    test("abcde", 1, 0, "", 1, 0, 0);
+    test("abcde", 1, 0, "abcde", 0, 0, 0);
+    test("abcde", 1, 0, "abcde", 0, 1, -1);
+    test("abcde", 1, 0, "abcde", 0, 2, -2);
+    test("abcde", 1, 0, "abcde", 0, 4, -4);
+    test("abcde", 1, 0, "abcde", 0, 5, -5);
+    test("abcde", 1, 0, "abcde", 0, 6, -5);
+    test("abcde", 1, 0, "abcde", 1, 0, 0);
+    test("abcde", 1, 0, "abcde", 1, 1, -1);
+    test("abcde", 1, 0, "abcde", 1, 2, -2);
+    test("abcde", 1, 0, "abcde", 1, 3, -3);
+    test("abcde", 1, 0, "abcde", 1, 4, -4);
+    test("abcde", 1, 0, "abcde", 1, 5, -4);
+    test("abcde", 1, 0, "abcde", 2, 0, 0);
+    test("abcde", 1, 0, "abcde", 2, 1, -1);
+    test("abcde", 1, 0, "abcde", 2, 2, -2);
+    test("abcde", 1, 0, "abcde", 2, 3, -3);
+    test("abcde", 1, 0, "abcde", 2, 4, -3);
+    test("abcde", 1, 0, "abcde", 4, 0, 0);
+    test("abcde", 1, 0, "abcde", 4, 1, -1);
+    test("abcde", 1, 0, "abcde", 4, 2, -1);
+    test("abcde", 1, 0, "abcde", 5, 0, 0);
+    test("abcde", 1, 0, "abcde", 5, 1, 0);
+    test("abcde", 1, 0, "abcde", 6, 0, 0);
+    test("abcde", 1, 0, "abcdefghij", 0, 0, 0);
+    test("abcde", 1, 0, "abcdefghij", 0, 1, -1);
+    test("abcde", 1, 0, "abcdefghij", 0, 5, -5);
+    test("abcde", 1, 0, "abcdefghij", 0, 9, -9);
+    test("abcde", 1, 0, "abcdefghij", 0, 10, -10);
+    test("abcde", 1, 0, "abcdefghij", 0, 11, -10);
+    test("abcde", 1, 0, "abcdefghij", 1, 0, 0);
+    test("abcde", 1, 0, "abcdefghij", 1, 1, -1);
+}
+
+void test7()
+{
+    test("abcde", 1, 0, "abcdefghij", 1, 4, -4);
+    test("abcde", 1, 0, "abcdefghij", 1, 8, -8);
+    test("abcde", 1, 0, "abcdefghij", 1, 9, -9);
+    test("abcde", 1, 0, "abcdefghij", 1, 10, -9);
+    test("abcde", 1, 0, "abcdefghij", 5, 0, 0);
+    test("abcde", 1, 0, "abcdefghij", 5, 1, -1);
+    test("abcde", 1, 0, "abcdefghij", 5, 2, -2);
+    test("abcde", 1, 0, "abcdefghij", 5, 4, -4);
+    test("abcde", 1, 0, "abcdefghij", 5, 5, -5);
+    test("abcde", 1, 0, "abcdefghij", 5, 6, -5);
+    test("abcde", 1, 0, "abcdefghij", 9, 0, 0);
+    test("abcde", 1, 0, "abcdefghij", 9, 1, -1);
+    test("abcde", 1, 0, "abcdefghij", 9, 2, -1);
+    test("abcde", 1, 0, "abcdefghij", 10, 0, 0);
+    test("abcde", 1, 0, "abcdefghij", 10, 1, 0);
+    test("abcde", 1, 0, "abcdefghij", 11, 0, 0);
+    test("abcde", 1, 0, "abcdefghijklmnopqrst", 0, 0, 0);
+    test("abcde", 1, 0, "abcdefghijklmnopqrst", 0, 1, -1);
+    test("abcde", 1, 0, "abcdefghijklmnopqrst", 0, 10, -10);
+    test("abcde", 1, 0, "abcdefghijklmnopqrst", 0, 19, -19);
+    test("abcde", 1, 0, "abcdefghijklmnopqrst", 0, 20, -20);
+    test("abcde", 1, 0, "abcdefghijklmnopqrst", 0, 21, -20);
+    test("abcde", 1, 0, "abcdefghijklmnopqrst", 1, 0, 0);
+    test("abcde", 1, 0, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("abcde", 1, 0, "abcdefghijklmnopqrst", 1, 9, -9);
+    test("abcde", 1, 0, "abcdefghijklmnopqrst", 1, 18, -18);
+    test("abcde", 1, 0, "abcdefghijklmnopqrst", 1, 19, -19);
+    test("abcde", 1, 0, "abcdefghijklmnopqrst", 1, 20, -19);
+    test("abcde", 1, 0, "abcdefghijklmnopqrst", 10, 0, 0);
+    test("abcde", 1, 0, "abcdefghijklmnopqrst", 10, 1, -1);
+    test("abcde", 1, 0, "abcdefghijklmnopqrst", 10, 5, -5);
+    test("abcde", 1, 0, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("abcde", 1, 0, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("abcde", 1, 0, "abcdefghijklmnopqrst", 10, 11, -10);
+    test("abcde", 1, 0, "abcdefghijklmnopqrst", 19, 0, 0);
+    test("abcde", 1, 0, "abcdefghijklmnopqrst", 19, 1, -1);
+    test("abcde", 1, 0, "abcdefghijklmnopqrst", 19, 2, -1);
+    test("abcde", 1, 0, "abcdefghijklmnopqrst", 20, 0, 0);
+    test("abcde", 1, 0, "abcdefghijklmnopqrst", 20, 1, 0);
+    test("abcde", 1, 0, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcde", 1, 1, "", 0, 0, 1);
+    test("abcde", 1, 1, "", 0, 1, 1);
+    test("abcde", 1, 1, "", 1, 0, 0);
+    test("abcde", 1, 1, "abcde", 0, 0, 1);
+    test("abcde", 1, 1, "abcde", 0, 1, 1);
+    test("abcde", 1, 1, "abcde", 0, 2, 1);
+    test("abcde", 1, 1, "abcde", 0, 4, 1);
+    test("abcde", 1, 1, "abcde", 0, 5, 1);
+    test("abcde", 1, 1, "abcde", 0, 6, 1);
+    test("abcde", 1, 1, "abcde", 1, 0, 1);
+    test("abcde", 1, 1, "abcde", 1, 1, 0);
+    test("abcde", 1, 1, "abcde", 1, 2, -1);
+    test("abcde", 1, 1, "abcde", 1, 3, -2);
+    test("abcde", 1, 1, "abcde", 1, 4, -3);
+    test("abcde", 1, 1, "abcde", 1, 5, -3);
+    test("abcde", 1, 1, "abcde", 2, 0, 1);
+    test("abcde", 1, 1, "abcde", 2, 1, -1);
+    test("abcde", 1, 1, "abcde", 2, 2, -1);
+    test("abcde", 1, 1, "abcde", 2, 3, -1);
+    test("abcde", 1, 1, "abcde", 2, 4, -1);
+    test("abcde", 1, 1, "abcde", 4, 0, 1);
+    test("abcde", 1, 1, "abcde", 4, 1, -3);
+    test("abcde", 1, 1, "abcde", 4, 2, -3);
+    test("abcde", 1, 1, "abcde", 5, 0, 1);
+    test("abcde", 1, 1, "abcde", 5, 1, 1);
+    test("abcde", 1, 1, "abcde", 6, 0, 0);
+    test("abcde", 1, 1, "abcdefghij", 0, 0, 1);
+    test("abcde", 1, 1, "abcdefghij", 0, 1, 1);
+    test("abcde", 1, 1, "abcdefghij", 0, 5, 1);
+    test("abcde", 1, 1, "abcdefghij", 0, 9, 1);
+    test("abcde", 1, 1, "abcdefghij", 0, 10, 1);
+    test("abcde", 1, 1, "abcdefghij", 0, 11, 1);
+    test("abcde", 1, 1, "abcdefghij", 1, 0, 1);
+    test("abcde", 1, 1, "abcdefghij", 1, 1, 0);
+    test("abcde", 1, 1, "abcdefghij", 1, 4, -3);
+    test("abcde", 1, 1, "abcdefghij", 1, 8, -7);
+    test("abcde", 1, 1, "abcdefghij", 1, 9, -8);
+    test("abcde", 1, 1, "abcdefghij", 1, 10, -8);
+    test("abcde", 1, 1, "abcdefghij", 5, 0, 1);
+    test("abcde", 1, 1, "abcdefghij", 5, 1, -4);
+    test("abcde", 1, 1, "abcdefghij", 5, 2, -4);
+    test("abcde", 1, 1, "abcdefghij", 5, 4, -4);
+    test("abcde", 1, 1, "abcdefghij", 5, 5, -4);
+    test("abcde", 1, 1, "abcdefghij", 5, 6, -4);
+    test("abcde", 1, 1, "abcdefghij", 9, 0, 1);
+    test("abcde", 1, 1, "abcdefghij", 9, 1, -8);
+    test("abcde", 1, 1, "abcdefghij", 9, 2, -8);
+    test("abcde", 1, 1, "abcdefghij", 10, 0, 1);
+    test("abcde", 1, 1, "abcdefghij", 10, 1, 1);
+    test("abcde", 1, 1, "abcdefghij", 11, 0, 0);
+    test("abcde", 1, 1, "abcdefghijklmnopqrst", 0, 0, 1);
+    test("abcde", 1, 1, "abcdefghijklmnopqrst", 0, 1, 1);
+    test("abcde", 1, 1, "abcdefghijklmnopqrst", 0, 10, 1);
+    test("abcde", 1, 1, "abcdefghijklmnopqrst", 0, 19, 1);
+    test("abcde", 1, 1, "abcdefghijklmnopqrst", 0, 20, 1);
+    test("abcde", 1, 1, "abcdefghijklmnopqrst", 0, 21, 1);
+    test("abcde", 1, 1, "abcdefghijklmnopqrst", 1, 0, 1);
+    test("abcde", 1, 1, "abcdefghijklmnopqrst", 1, 1, 0);
+    test("abcde", 1, 1, "abcdefghijklmnopqrst", 1, 9, -8);
+    test("abcde", 1, 1, "abcdefghijklmnopqrst", 1, 18, -17);
+}
+
+void test8()
+{
+    test("abcde", 1, 1, "abcdefghijklmnopqrst", 1, 19, -18);
+    test("abcde", 1, 1, "abcdefghijklmnopqrst", 1, 20, -18);
+    test("abcde", 1, 1, "abcdefghijklmnopqrst", 10, 0, 1);
+    test("abcde", 1, 1, "abcdefghijklmnopqrst", 10, 1, -9);
+    test("abcde", 1, 1, "abcdefghijklmnopqrst", 10, 5, -9);
+    test("abcde", 1, 1, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("abcde", 1, 1, "abcdefghijklmnopqrst", 10, 10, -9);
+    test("abcde", 1, 1, "abcdefghijklmnopqrst", 10, 11, -9);
+    test("abcde", 1, 1, "abcdefghijklmnopqrst", 19, 0, 1);
+    test("abcde", 1, 1, "abcdefghijklmnopqrst", 19, 1, -18);
+    test("abcde", 1, 1, "abcdefghijklmnopqrst", 19, 2, -18);
+    test("abcde", 1, 1, "abcdefghijklmnopqrst", 20, 0, 1);
+    test("abcde", 1, 1, "abcdefghijklmnopqrst", 20, 1, 1);
+    test("abcde", 1, 1, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcde", 1, 2, "", 0, 0, 2);
+    test("abcde", 1, 2, "", 0, 1, 2);
+    test("abcde", 1, 2, "", 1, 0, 0);
+    test("abcde", 1, 2, "abcde", 0, 0, 2);
+    test("abcde", 1, 2, "abcde", 0, 1, 1);
+    test("abcde", 1, 2, "abcde", 0, 2, 1);
+    test("abcde", 1, 2, "abcde", 0, 4, 1);
+    test("abcde", 1, 2, "abcde", 0, 5, 1);
+    test("abcde", 1, 2, "abcde", 0, 6, 1);
+    test("abcde", 1, 2, "abcde", 1, 0, 2);
+    test("abcde", 1, 2, "abcde", 1, 1, 1);
+    test("abcde", 1, 2, "abcde", 1, 2, 0);
+    test("abcde", 1, 2, "abcde", 1, 3, -1);
+    test("abcde", 1, 2, "abcde", 1, 4, -2);
+    test("abcde", 1, 2, "abcde", 1, 5, -2);
+    test("abcde", 1, 2, "abcde", 2, 0, 2);
+    test("abcde", 1, 2, "abcde", 2, 1, -1);
+    test("abcde", 1, 2, "abcde", 2, 2, -1);
+    test("abcde", 1, 2, "abcde", 2, 3, -1);
+    test("abcde", 1, 2, "abcde", 2, 4, -1);
+    test("abcde", 1, 2, "abcde", 4, 0, 2);
+    test("abcde", 1, 2, "abcde", 4, 1, -3);
+    test("abcde", 1, 2, "abcde", 4, 2, -3);
+    test("abcde", 1, 2, "abcde", 5, 0, 2);
+    test("abcde", 1, 2, "abcde", 5, 1, 2);
+    test("abcde", 1, 2, "abcde", 6, 0, 0);
+    test("abcde", 1, 2, "abcdefghij", 0, 0, 2);
+    test("abcde", 1, 2, "abcdefghij", 0, 1, 1);
+    test("abcde", 1, 2, "abcdefghij", 0, 5, 1);
+    test("abcde", 1, 2, "abcdefghij", 0, 9, 1);
+    test("abcde", 1, 2, "abcdefghij", 0, 10, 1);
+    test("abcde", 1, 2, "abcdefghij", 0, 11, 1);
+    test("abcde", 1, 2, "abcdefghij", 1, 0, 2);
+    test("abcde", 1, 2, "abcdefghij", 1, 1, 1);
+    test("abcde", 1, 2, "abcdefghij", 1, 4, -2);
+    test("abcde", 1, 2, "abcdefghij", 1, 8, -6);
+    test("abcde", 1, 2, "abcdefghij", 1, 9, -7);
+    test("abcde", 1, 2, "abcdefghij", 1, 10, -7);
+    test("abcde", 1, 2, "abcdefghij", 5, 0, 2);
+    test("abcde", 1, 2, "abcdefghij", 5, 1, -4);
+    test("abcde", 1, 2, "abcdefghij", 5, 2, -4);
+    test("abcde", 1, 2, "abcdefghij", 5, 4, -4);
+    test("abcde", 1, 2, "abcdefghij", 5, 5, -4);
+    test("abcde", 1, 2, "abcdefghij", 5, 6, -4);
+    test("abcde", 1, 2, "abcdefghij", 9, 0, 2);
+    test("abcde", 1, 2, "abcdefghij", 9, 1, -8);
+    test("abcde", 1, 2, "abcdefghij", 9, 2, -8);
+    test("abcde", 1, 2, "abcdefghij", 10, 0, 2);
+    test("abcde", 1, 2, "abcdefghij", 10, 1, 2);
+    test("abcde", 1, 2, "abcdefghij", 11, 0, 0);
+    test("abcde", 1, 2, "abcdefghijklmnopqrst", 0, 0, 2);
+    test("abcde", 1, 2, "abcdefghijklmnopqrst", 0, 1, 1);
+    test("abcde", 1, 2, "abcdefghijklmnopqrst", 0, 10, 1);
+    test("abcde", 1, 2, "abcdefghijklmnopqrst", 0, 19, 1);
+    test("abcde", 1, 2, "abcdefghijklmnopqrst", 0, 20, 1);
+    test("abcde", 1, 2, "abcdefghijklmnopqrst", 0, 21, 1);
+    test("abcde", 1, 2, "abcdefghijklmnopqrst", 1, 0, 2);
+    test("abcde", 1, 2, "abcdefghijklmnopqrst", 1, 1, 1);
+    test("abcde", 1, 2, "abcdefghijklmnopqrst", 1, 9, -7);
+    test("abcde", 1, 2, "abcdefghijklmnopqrst", 1, 18, -16);
+    test("abcde", 1, 2, "abcdefghijklmnopqrst", 1, 19, -17);
+    test("abcde", 1, 2, "abcdefghijklmnopqrst", 1, 20, -17);
+    test("abcde", 1, 2, "abcdefghijklmnopqrst", 10, 0, 2);
+    test("abcde", 1, 2, "abcdefghijklmnopqrst", 10, 1, -9);
+    test("abcde", 1, 2, "abcdefghijklmnopqrst", 10, 5, -9);
+    test("abcde", 1, 2, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("abcde", 1, 2, "abcdefghijklmnopqrst", 10, 10, -9);
+    test("abcde", 1, 2, "abcdefghijklmnopqrst", 10, 11, -9);
+    test("abcde", 1, 2, "abcdefghijklmnopqrst", 19, 0, 2);
+    test("abcde", 1, 2, "abcdefghijklmnopqrst", 19, 1, -18);
+    test("abcde", 1, 2, "abcdefghijklmnopqrst", 19, 2, -18);
+    test("abcde", 1, 2, "abcdefghijklmnopqrst", 20, 0, 2);
+    test("abcde", 1, 2, "abcdefghijklmnopqrst", 20, 1, 2);
+    test("abcde", 1, 2, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcde", 1, 3, "", 0, 0, 3);
+    test("abcde", 1, 3, "", 0, 1, 3);
+    test("abcde", 1, 3, "", 1, 0, 0);
+    test("abcde", 1, 3, "abcde", 0, 0, 3);
+    test("abcde", 1, 3, "abcde", 0, 1, 1);
+    test("abcde", 1, 3, "abcde", 0, 2, 1);
+    test("abcde", 1, 3, "abcde", 0, 4, 1);
+    test("abcde", 1, 3, "abcde", 0, 5, 1);
+    test("abcde", 1, 3, "abcde", 0, 6, 1);
+    test("abcde", 1, 3, "abcde", 1, 0, 3);
+    test("abcde", 1, 3, "abcde", 1, 1, 2);
+    test("abcde", 1, 3, "abcde", 1, 2, 1);
+}
+
+void test9()
+{
+    test("abcde", 1, 3, "abcde", 1, 3, 0);
+    test("abcde", 1, 3, "abcde", 1, 4, -1);
+    test("abcde", 1, 3, "abcde", 1, 5, -1);
+    test("abcde", 1, 3, "abcde", 2, 0, 3);
+    test("abcde", 1, 3, "abcde", 2, 1, -1);
+    test("abcde", 1, 3, "abcde", 2, 2, -1);
+    test("abcde", 1, 3, "abcde", 2, 3, -1);
+    test("abcde", 1, 3, "abcde", 2, 4, -1);
+    test("abcde", 1, 3, "abcde", 4, 0, 3);
+    test("abcde", 1, 3, "abcde", 4, 1, -3);
+    test("abcde", 1, 3, "abcde", 4, 2, -3);
+    test("abcde", 1, 3, "abcde", 5, 0, 3);
+    test("abcde", 1, 3, "abcde", 5, 1, 3);
+    test("abcde", 1, 3, "abcde", 6, 0, 0);
+    test("abcde", 1, 3, "abcdefghij", 0, 0, 3);
+    test("abcde", 1, 3, "abcdefghij", 0, 1, 1);
+    test("abcde", 1, 3, "abcdefghij", 0, 5, 1);
+    test("abcde", 1, 3, "abcdefghij", 0, 9, 1);
+    test("abcde", 1, 3, "abcdefghij", 0, 10, 1);
+    test("abcde", 1, 3, "abcdefghij", 0, 11, 1);
+    test("abcde", 1, 3, "abcdefghij", 1, 0, 3);
+    test("abcde", 1, 3, "abcdefghij", 1, 1, 2);
+    test("abcde", 1, 3, "abcdefghij", 1, 4, -1);
+    test("abcde", 1, 3, "abcdefghij", 1, 8, -5);
+    test("abcde", 1, 3, "abcdefghij", 1, 9, -6);
+    test("abcde", 1, 3, "abcdefghij", 1, 10, -6);
+    test("abcde", 1, 3, "abcdefghij", 5, 0, 3);
+    test("abcde", 1, 3, "abcdefghij", 5, 1, -4);
+    test("abcde", 1, 3, "abcdefghij", 5, 2, -4);
+    test("abcde", 1, 3, "abcdefghij", 5, 4, -4);
+    test("abcde", 1, 3, "abcdefghij", 5, 5, -4);
+    test("abcde", 1, 3, "abcdefghij", 5, 6, -4);
+    test("abcde", 1, 3, "abcdefghij", 9, 0, 3);
+    test("abcde", 1, 3, "abcdefghij", 9, 1, -8);
+    test("abcde", 1, 3, "abcdefghij", 9, 2, -8);
+    test("abcde", 1, 3, "abcdefghij", 10, 0, 3);
+    test("abcde", 1, 3, "abcdefghij", 10, 1, 3);
+    test("abcde", 1, 3, "abcdefghij", 11, 0, 0);
+    test("abcde", 1, 3, "abcdefghijklmnopqrst", 0, 0, 3);
+    test("abcde", 1, 3, "abcdefghijklmnopqrst", 0, 1, 1);
+    test("abcde", 1, 3, "abcdefghijklmnopqrst", 0, 10, 1);
+    test("abcde", 1, 3, "abcdefghijklmnopqrst", 0, 19, 1);
+    test("abcde", 1, 3, "abcdefghijklmnopqrst", 0, 20, 1);
+    test("abcde", 1, 3, "abcdefghijklmnopqrst", 0, 21, 1);
+    test("abcde", 1, 3, "abcdefghijklmnopqrst", 1, 0, 3);
+    test("abcde", 1, 3, "abcdefghijklmnopqrst", 1, 1, 2);
+    test("abcde", 1, 3, "abcdefghijklmnopqrst", 1, 9, -6);
+    test("abcde", 1, 3, "abcdefghijklmnopqrst", 1, 18, -15);
+    test("abcde", 1, 3, "abcdefghijklmnopqrst", 1, 19, -16);
+    test("abcde", 1, 3, "abcdefghijklmnopqrst", 1, 20, -16);
+    test("abcde", 1, 3, "abcdefghijklmnopqrst", 10, 0, 3);
+    test("abcde", 1, 3, "abcdefghijklmnopqrst", 10, 1, -9);
+    test("abcde", 1, 3, "abcdefghijklmnopqrst", 10, 5, -9);
+    test("abcde", 1, 3, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("abcde", 1, 3, "abcdefghijklmnopqrst", 10, 10, -9);
+    test("abcde", 1, 3, "abcdefghijklmnopqrst", 10, 11, -9);
+    test("abcde", 1, 3, "abcdefghijklmnopqrst", 19, 0, 3);
+    test("abcde", 1, 3, "abcdefghijklmnopqrst", 19, 1, -18);
+    test("abcde", 1, 3, "abcdefghijklmnopqrst", 19, 2, -18);
+    test("abcde", 1, 3, "abcdefghijklmnopqrst", 20, 0, 3);
+    test("abcde", 1, 3, "abcdefghijklmnopqrst", 20, 1, 3);
+    test("abcde", 1, 3, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcde", 1, 4, "", 0, 0, 4);
+    test("abcde", 1, 4, "", 0, 1, 4);
+    test("abcde", 1, 4, "", 1, 0, 0);
+    test("abcde", 1, 4, "abcde", 0, 0, 4);
+    test("abcde", 1, 4, "abcde", 0, 1, 1);
+    test("abcde", 1, 4, "abcde", 0, 2, 1);
+    test("abcde", 1, 4, "abcde", 0, 4, 1);
+    test("abcde", 1, 4, "abcde", 0, 5, 1);
+    test("abcde", 1, 4, "abcde", 0, 6, 1);
+    test("abcde", 1, 4, "abcde", 1, 0, 4);
+    test("abcde", 1, 4, "abcde", 1, 1, 3);
+    test("abcde", 1, 4, "abcde", 1, 2, 2);
+    test("abcde", 1, 4, "abcde", 1, 3, 1);
+    test("abcde", 1, 4, "abcde", 1, 4, 0);
+    test("abcde", 1, 4, "abcde", 1, 5, 0);
+    test("abcde", 1, 4, "abcde", 2, 0, 4);
+    test("abcde", 1, 4, "abcde", 2, 1, -1);
+    test("abcde", 1, 4, "abcde", 2, 2, -1);
+    test("abcde", 1, 4, "abcde", 2, 3, -1);
+    test("abcde", 1, 4, "abcde", 2, 4, -1);
+    test("abcde", 1, 4, "abcde", 4, 0, 4);
+    test("abcde", 1, 4, "abcde", 4, 1, -3);
+    test("abcde", 1, 4, "abcde", 4, 2, -3);
+    test("abcde", 1, 4, "abcde", 5, 0, 4);
+    test("abcde", 1, 4, "abcde", 5, 1, 4);
+    test("abcde", 1, 4, "abcde", 6, 0, 0);
+    test("abcde", 1, 4, "abcdefghij", 0, 0, 4);
+    test("abcde", 1, 4, "abcdefghij", 0, 1, 1);
+    test("abcde", 1, 4, "abcdefghij", 0, 5, 1);
+    test("abcde", 1, 4, "abcdefghij", 0, 9, 1);
+    test("abcde", 1, 4, "abcdefghij", 0, 10, 1);
+    test("abcde", 1, 4, "abcdefghij", 0, 11, 1);
+    test("abcde", 1, 4, "abcdefghij", 1, 0, 4);
+    test("abcde", 1, 4, "abcdefghij", 1, 1, 3);
+    test("abcde", 1, 4, "abcdefghij", 1, 4, 0);
+    test("abcde", 1, 4, "abcdefghij", 1, 8, -4);
+    test("abcde", 1, 4, "abcdefghij", 1, 9, -5);
+    test("abcde", 1, 4, "abcdefghij", 1, 10, -5);
+}
+
+void test10()
+{
+    test("abcde", 1, 4, "abcdefghij", 5, 0, 4);
+    test("abcde", 1, 4, "abcdefghij", 5, 1, -4);
+    test("abcde", 1, 4, "abcdefghij", 5, 2, -4);
+    test("abcde", 1, 4, "abcdefghij", 5, 4, -4);
+    test("abcde", 1, 4, "abcdefghij", 5, 5, -4);
+    test("abcde", 1, 4, "abcdefghij", 5, 6, -4);
+    test("abcde", 1, 4, "abcdefghij", 9, 0, 4);
+    test("abcde", 1, 4, "abcdefghij", 9, 1, -8);
+    test("abcde", 1, 4, "abcdefghij", 9, 2, -8);
+    test("abcde", 1, 4, "abcdefghij", 10, 0, 4);
+    test("abcde", 1, 4, "abcdefghij", 10, 1, 4);
+    test("abcde", 1, 4, "abcdefghij", 11, 0, 0);
+    test("abcde", 1, 4, "abcdefghijklmnopqrst", 0, 0, 4);
+    test("abcde", 1, 4, "abcdefghijklmnopqrst", 0, 1, 1);
+    test("abcde", 1, 4, "abcdefghijklmnopqrst", 0, 10, 1);
+    test("abcde", 1, 4, "abcdefghijklmnopqrst", 0, 19, 1);
+    test("abcde", 1, 4, "abcdefghijklmnopqrst", 0, 20, 1);
+    test("abcde", 1, 4, "abcdefghijklmnopqrst", 0, 21, 1);
+    test("abcde", 1, 4, "abcdefghijklmnopqrst", 1, 0, 4);
+    test("abcde", 1, 4, "abcdefghijklmnopqrst", 1, 1, 3);
+    test("abcde", 1, 4, "abcdefghijklmnopqrst", 1, 9, -5);
+    test("abcde", 1, 4, "abcdefghijklmnopqrst", 1, 18, -14);
+    test("abcde", 1, 4, "abcdefghijklmnopqrst", 1, 19, -15);
+    test("abcde", 1, 4, "abcdefghijklmnopqrst", 1, 20, -15);
+    test("abcde", 1, 4, "abcdefghijklmnopqrst", 10, 0, 4);
+    test("abcde", 1, 4, "abcdefghijklmnopqrst", 10, 1, -9);
+    test("abcde", 1, 4, "abcdefghijklmnopqrst", 10, 5, -9);
+    test("abcde", 1, 4, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("abcde", 1, 4, "abcdefghijklmnopqrst", 10, 10, -9);
+    test("abcde", 1, 4, "abcdefghijklmnopqrst", 10, 11, -9);
+    test("abcde", 1, 4, "abcdefghijklmnopqrst", 19, 0, 4);
+    test("abcde", 1, 4, "abcdefghijklmnopqrst", 19, 1, -18);
+    test("abcde", 1, 4, "abcdefghijklmnopqrst", 19, 2, -18);
+    test("abcde", 1, 4, "abcdefghijklmnopqrst", 20, 0, 4);
+    test("abcde", 1, 4, "abcdefghijklmnopqrst", 20, 1, 4);
+    test("abcde", 1, 4, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcde", 1, 5, "", 0, 0, 4);
+    test("abcde", 1, 5, "", 0, 1, 4);
+    test("abcde", 1, 5, "", 1, 0, 0);
+    test("abcde", 1, 5, "abcde", 0, 0, 4);
+    test("abcde", 1, 5, "abcde", 0, 1, 1);
+    test("abcde", 1, 5, "abcde", 0, 2, 1);
+    test("abcde", 1, 5, "abcde", 0, 4, 1);
+    test("abcde", 1, 5, "abcde", 0, 5, 1);
+    test("abcde", 1, 5, "abcde", 0, 6, 1);
+    test("abcde", 1, 5, "abcde", 1, 0, 4);
+    test("abcde", 1, 5, "abcde", 1, 1, 3);
+    test("abcde", 1, 5, "abcde", 1, 2, 2);
+    test("abcde", 1, 5, "abcde", 1, 3, 1);
+    test("abcde", 1, 5, "abcde", 1, 4, 0);
+    test("abcde", 1, 5, "abcde", 1, 5, 0);
+    test("abcde", 1, 5, "abcde", 2, 0, 4);
+    test("abcde", 1, 5, "abcde", 2, 1, -1);
+    test("abcde", 1, 5, "abcde", 2, 2, -1);
+    test("abcde", 1, 5, "abcde", 2, 3, -1);
+    test("abcde", 1, 5, "abcde", 2, 4, -1);
+    test("abcde", 1, 5, "abcde", 4, 0, 4);
+    test("abcde", 1, 5, "abcde", 4, 1, -3);
+    test("abcde", 1, 5, "abcde", 4, 2, -3);
+    test("abcde", 1, 5, "abcde", 5, 0, 4);
+    test("abcde", 1, 5, "abcde", 5, 1, 4);
+    test("abcde", 1, 5, "abcde", 6, 0, 0);
+    test("abcde", 1, 5, "abcdefghij", 0, 0, 4);
+    test("abcde", 1, 5, "abcdefghij", 0, 1, 1);
+    test("abcde", 1, 5, "abcdefghij", 0, 5, 1);
+    test("abcde", 1, 5, "abcdefghij", 0, 9, 1);
+    test("abcde", 1, 5, "abcdefghij", 0, 10, 1);
+    test("abcde", 1, 5, "abcdefghij", 0, 11, 1);
+    test("abcde", 1, 5, "abcdefghij", 1, 0, 4);
+    test("abcde", 1, 5, "abcdefghij", 1, 1, 3);
+    test("abcde", 1, 5, "abcdefghij", 1, 4, 0);
+    test("abcde", 1, 5, "abcdefghij", 1, 8, -4);
+    test("abcde", 1, 5, "abcdefghij", 1, 9, -5);
+    test("abcde", 1, 5, "abcdefghij", 1, 10, -5);
+    test("abcde", 1, 5, "abcdefghij", 5, 0, 4);
+    test("abcde", 1, 5, "abcdefghij", 5, 1, -4);
+    test("abcde", 1, 5, "abcdefghij", 5, 2, -4);
+    test("abcde", 1, 5, "abcdefghij", 5, 4, -4);
+    test("abcde", 1, 5, "abcdefghij", 5, 5, -4);
+    test("abcde", 1, 5, "abcdefghij", 5, 6, -4);
+    test("abcde", 1, 5, "abcdefghij", 9, 0, 4);
+    test("abcde", 1, 5, "abcdefghij", 9, 1, -8);
+    test("abcde", 1, 5, "abcdefghij", 9, 2, -8);
+    test("abcde", 1, 5, "abcdefghij", 10, 0, 4);
+    test("abcde", 1, 5, "abcdefghij", 10, 1, 4);
+    test("abcde", 1, 5, "abcdefghij", 11, 0, 0);
+    test("abcde", 1, 5, "abcdefghijklmnopqrst", 0, 0, 4);
+    test("abcde", 1, 5, "abcdefghijklmnopqrst", 0, 1, 1);
+    test("abcde", 1, 5, "abcdefghijklmnopqrst", 0, 10, 1);
+    test("abcde", 1, 5, "abcdefghijklmnopqrst", 0, 19, 1);
+    test("abcde", 1, 5, "abcdefghijklmnopqrst", 0, 20, 1);
+    test("abcde", 1, 5, "abcdefghijklmnopqrst", 0, 21, 1);
+    test("abcde", 1, 5, "abcdefghijklmnopqrst", 1, 0, 4);
+    test("abcde", 1, 5, "abcdefghijklmnopqrst", 1, 1, 3);
+    test("abcde", 1, 5, "abcdefghijklmnopqrst", 1, 9, -5);
+    test("abcde", 1, 5, "abcdefghijklmnopqrst", 1, 18, -14);
+    test("abcde", 1, 5, "abcdefghijklmnopqrst", 1, 19, -15);
+    test("abcde", 1, 5, "abcdefghijklmnopqrst", 1, 20, -15);
+    test("abcde", 1, 5, "abcdefghijklmnopqrst", 10, 0, 4);
+    test("abcde", 1, 5, "abcdefghijklmnopqrst", 10, 1, -9);
+}
+
+void test11()
+{
+    test("abcde", 1, 5, "abcdefghijklmnopqrst", 10, 5, -9);
+    test("abcde", 1, 5, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("abcde", 1, 5, "abcdefghijklmnopqrst", 10, 10, -9);
+    test("abcde", 1, 5, "abcdefghijklmnopqrst", 10, 11, -9);
+    test("abcde", 1, 5, "abcdefghijklmnopqrst", 19, 0, 4);
+    test("abcde", 1, 5, "abcdefghijklmnopqrst", 19, 1, -18);
+    test("abcde", 1, 5, "abcdefghijklmnopqrst", 19, 2, -18);
+    test("abcde", 1, 5, "abcdefghijklmnopqrst", 20, 0, 4);
+    test("abcde", 1, 5, "abcdefghijklmnopqrst", 20, 1, 4);
+    test("abcde", 1, 5, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcde", 2, 0, "", 0, 0, 0);
+    test("abcde", 2, 0, "", 0, 1, 0);
+    test("abcde", 2, 0, "", 1, 0, 0);
+    test("abcde", 2, 0, "abcde", 0, 0, 0);
+    test("abcde", 2, 0, "abcde", 0, 1, -1);
+    test("abcde", 2, 0, "abcde", 0, 2, -2);
+    test("abcde", 2, 0, "abcde", 0, 4, -4);
+    test("abcde", 2, 0, "abcde", 0, 5, -5);
+    test("abcde", 2, 0, "abcde", 0, 6, -5);
+    test("abcde", 2, 0, "abcde", 1, 0, 0);
+    test("abcde", 2, 0, "abcde", 1, 1, -1);
+    test("abcde", 2, 0, "abcde", 1, 2, -2);
+    test("abcde", 2, 0, "abcde", 1, 3, -3);
+    test("abcde", 2, 0, "abcde", 1, 4, -4);
+    test("abcde", 2, 0, "abcde", 1, 5, -4);
+    test("abcde", 2, 0, "abcde", 2, 0, 0);
+    test("abcde", 2, 0, "abcde", 2, 1, -1);
+    test("abcde", 2, 0, "abcde", 2, 2, -2);
+    test("abcde", 2, 0, "abcde", 2, 3, -3);
+    test("abcde", 2, 0, "abcde", 2, 4, -3);
+    test("abcde", 2, 0, "abcde", 4, 0, 0);
+    test("abcde", 2, 0, "abcde", 4, 1, -1);
+    test("abcde", 2, 0, "abcde", 4, 2, -1);
+    test("abcde", 2, 0, "abcde", 5, 0, 0);
+    test("abcde", 2, 0, "abcde", 5, 1, 0);
+    test("abcde", 2, 0, "abcde", 6, 0, 0);
+    test("abcde", 2, 0, "abcdefghij", 0, 0, 0);
+    test("abcde", 2, 0, "abcdefghij", 0, 1, -1);
+    test("abcde", 2, 0, "abcdefghij", 0, 5, -5);
+    test("abcde", 2, 0, "abcdefghij", 0, 9, -9);
+    test("abcde", 2, 0, "abcdefghij", 0, 10, -10);
+    test("abcde", 2, 0, "abcdefghij", 0, 11, -10);
+    test("abcde", 2, 0, "abcdefghij", 1, 0, 0);
+    test("abcde", 2, 0, "abcdefghij", 1, 1, -1);
+    test("abcde", 2, 0, "abcdefghij", 1, 4, -4);
+    test("abcde", 2, 0, "abcdefghij", 1, 8, -8);
+    test("abcde", 2, 0, "abcdefghij", 1, 9, -9);
+    test("abcde", 2, 0, "abcdefghij", 1, 10, -9);
+    test("abcde", 2, 0, "abcdefghij", 5, 0, 0);
+    test("abcde", 2, 0, "abcdefghij", 5, 1, -1);
+    test("abcde", 2, 0, "abcdefghij", 5, 2, -2);
+    test("abcde", 2, 0, "abcdefghij", 5, 4, -4);
+    test("abcde", 2, 0, "abcdefghij", 5, 5, -5);
+    test("abcde", 2, 0, "abcdefghij", 5, 6, -5);
+    test("abcde", 2, 0, "abcdefghij", 9, 0, 0);
+    test("abcde", 2, 0, "abcdefghij", 9, 1, -1);
+    test("abcde", 2, 0, "abcdefghij", 9, 2, -1);
+    test("abcde", 2, 0, "abcdefghij", 10, 0, 0);
+    test("abcde", 2, 0, "abcdefghij", 10, 1, 0);
+    test("abcde", 2, 0, "abcdefghij", 11, 0, 0);
+    test("abcde", 2, 0, "abcdefghijklmnopqrst", 0, 0, 0);
+    test("abcde", 2, 0, "abcdefghijklmnopqrst", 0, 1, -1);
+    test("abcde", 2, 0, "abcdefghijklmnopqrst", 0, 10, -10);
+    test("abcde", 2, 0, "abcdefghijklmnopqrst", 0, 19, -19);
+    test("abcde", 2, 0, "abcdefghijklmnopqrst", 0, 20, -20);
+    test("abcde", 2, 0, "abcdefghijklmnopqrst", 0, 21, -20);
+    test("abcde", 2, 0, "abcdefghijklmnopqrst", 1, 0, 0);
+    test("abcde", 2, 0, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("abcde", 2, 0, "abcdefghijklmnopqrst", 1, 9, -9);
+    test("abcde", 2, 0, "abcdefghijklmnopqrst", 1, 18, -18);
+    test("abcde", 2, 0, "abcdefghijklmnopqrst", 1, 19, -19);
+    test("abcde", 2, 0, "abcdefghijklmnopqrst", 1, 20, -19);
+    test("abcde", 2, 0, "abcdefghijklmnopqrst", 10, 0, 0);
+    test("abcde", 2, 0, "abcdefghijklmnopqrst", 10, 1, -1);
+    test("abcde", 2, 0, "abcdefghijklmnopqrst", 10, 5, -5);
+    test("abcde", 2, 0, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("abcde", 2, 0, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("abcde", 2, 0, "abcdefghijklmnopqrst", 10, 11, -10);
+    test("abcde", 2, 0, "abcdefghijklmnopqrst", 19, 0, 0);
+    test("abcde", 2, 0, "abcdefghijklmnopqrst", 19, 1, -1);
+    test("abcde", 2, 0, "abcdefghijklmnopqrst", 19, 2, -1);
+    test("abcde", 2, 0, "abcdefghijklmnopqrst", 20, 0, 0);
+    test("abcde", 2, 0, "abcdefghijklmnopqrst", 20, 1, 0);
+    test("abcde", 2, 0, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcde", 2, 1, "", 0, 0, 1);
+    test("abcde", 2, 1, "", 0, 1, 1);
+    test("abcde", 2, 1, "", 1, 0, 0);
+    test("abcde", 2, 1, "abcde", 0, 0, 1);
+    test("abcde", 2, 1, "abcde", 0, 1, 2);
+    test("abcde", 2, 1, "abcde", 0, 2, 2);
+    test("abcde", 2, 1, "abcde", 0, 4, 2);
+    test("abcde", 2, 1, "abcde", 0, 5, 2);
+    test("abcde", 2, 1, "abcde", 0, 6, 2);
+    test("abcde", 2, 1, "abcde", 1, 0, 1);
+    test("abcde", 2, 1, "abcde", 1, 1, 1);
+    test("abcde", 2, 1, "abcde", 1, 2, 1);
+    test("abcde", 2, 1, "abcde", 1, 3, 1);
+    test("abcde", 2, 1, "abcde", 1, 4, 1);
+    test("abcde", 2, 1, "abcde", 1, 5, 1);
+    test("abcde", 2, 1, "abcde", 2, 0, 1);
+}
+
+void test12()
+{
+    test("abcde", 2, 1, "abcde", 2, 1, 0);
+    test("abcde", 2, 1, "abcde", 2, 2, -1);
+    test("abcde", 2, 1, "abcde", 2, 3, -2);
+    test("abcde", 2, 1, "abcde", 2, 4, -2);
+    test("abcde", 2, 1, "abcde", 4, 0, 1);
+    test("abcde", 2, 1, "abcde", 4, 1, -2);
+    test("abcde", 2, 1, "abcde", 4, 2, -2);
+    test("abcde", 2, 1, "abcde", 5, 0, 1);
+    test("abcde", 2, 1, "abcde", 5, 1, 1);
+    test("abcde", 2, 1, "abcde", 6, 0, 0);
+    test("abcde", 2, 1, "abcdefghij", 0, 0, 1);
+    test("abcde", 2, 1, "abcdefghij", 0, 1, 2);
+    test("abcde", 2, 1, "abcdefghij", 0, 5, 2);
+    test("abcde", 2, 1, "abcdefghij", 0, 9, 2);
+    test("abcde", 2, 1, "abcdefghij", 0, 10, 2);
+    test("abcde", 2, 1, "abcdefghij", 0, 11, 2);
+    test("abcde", 2, 1, "abcdefghij", 1, 0, 1);
+    test("abcde", 2, 1, "abcdefghij", 1, 1, 1);
+    test("abcde", 2, 1, "abcdefghij", 1, 4, 1);
+    test("abcde", 2, 1, "abcdefghij", 1, 8, 1);
+    test("abcde", 2, 1, "abcdefghij", 1, 9, 1);
+    test("abcde", 2, 1, "abcdefghij", 1, 10, 1);
+    test("abcde", 2, 1, "abcdefghij", 5, 0, 1);
+    test("abcde", 2, 1, "abcdefghij", 5, 1, -3);
+    test("abcde", 2, 1, "abcdefghij", 5, 2, -3);
+    test("abcde", 2, 1, "abcdefghij", 5, 4, -3);
+    test("abcde", 2, 1, "abcdefghij", 5, 5, -3);
+    test("abcde", 2, 1, "abcdefghij", 5, 6, -3);
+    test("abcde", 2, 1, "abcdefghij", 9, 0, 1);
+    test("abcde", 2, 1, "abcdefghij", 9, 1, -7);
+    test("abcde", 2, 1, "abcdefghij", 9, 2, -7);
+    test("abcde", 2, 1, "abcdefghij", 10, 0, 1);
+    test("abcde", 2, 1, "abcdefghij", 10, 1, 1);
+    test("abcde", 2, 1, "abcdefghij", 11, 0, 0);
+    test("abcde", 2, 1, "abcdefghijklmnopqrst", 0, 0, 1);
+    test("abcde", 2, 1, "abcdefghijklmnopqrst", 0, 1, 2);
+    test("abcde", 2, 1, "abcdefghijklmnopqrst", 0, 10, 2);
+    test("abcde", 2, 1, "abcdefghijklmnopqrst", 0, 19, 2);
+    test("abcde", 2, 1, "abcdefghijklmnopqrst", 0, 20, 2);
+    test("abcde", 2, 1, "abcdefghijklmnopqrst", 0, 21, 2);
+    test("abcde", 2, 1, "abcdefghijklmnopqrst", 1, 0, 1);
+    test("abcde", 2, 1, "abcdefghijklmnopqrst", 1, 1, 1);
+    test("abcde", 2, 1, "abcdefghijklmnopqrst", 1, 9, 1);
+    test("abcde", 2, 1, "abcdefghijklmnopqrst", 1, 18, 1);
+    test("abcde", 2, 1, "abcdefghijklmnopqrst", 1, 19, 1);
+    test("abcde", 2, 1, "abcdefghijklmnopqrst", 1, 20, 1);
+    test("abcde", 2, 1, "abcdefghijklmnopqrst", 10, 0, 1);
+    test("abcde", 2, 1, "abcdefghijklmnopqrst", 10, 1, -8);
+    test("abcde", 2, 1, "abcdefghijklmnopqrst", 10, 5, -8);
+    test("abcde", 2, 1, "abcdefghijklmnopqrst", 10, 9, -8);
+    test("abcde", 2, 1, "abcdefghijklmnopqrst", 10, 10, -8);
+    test("abcde", 2, 1, "abcdefghijklmnopqrst", 10, 11, -8);
+    test("abcde", 2, 1, "abcdefghijklmnopqrst", 19, 0, 1);
+    test("abcde", 2, 1, "abcdefghijklmnopqrst", 19, 1, -17);
+    test("abcde", 2, 1, "abcdefghijklmnopqrst", 19, 2, -17);
+    test("abcde", 2, 1, "abcdefghijklmnopqrst", 20, 0, 1);
+    test("abcde", 2, 1, "abcdefghijklmnopqrst", 20, 1, 1);
+    test("abcde", 2, 1, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcde", 2, 2, "", 0, 0, 2);
+    test("abcde", 2, 2, "", 0, 1, 2);
+    test("abcde", 2, 2, "", 1, 0, 0);
+    test("abcde", 2, 2, "abcde", 0, 0, 2);
+    test("abcde", 2, 2, "abcde", 0, 1, 2);
+    test("abcde", 2, 2, "abcde", 0, 2, 2);
+    test("abcde", 2, 2, "abcde", 0, 4, 2);
+    test("abcde", 2, 2, "abcde", 0, 5, 2);
+    test("abcde", 2, 2, "abcde", 0, 6, 2);
+    test("abcde", 2, 2, "abcde", 1, 0, 2);
+    test("abcde", 2, 2, "abcde", 1, 1, 1);
+    test("abcde", 2, 2, "abcde", 1, 2, 1);
+    test("abcde", 2, 2, "abcde", 1, 3, 1);
+    test("abcde", 2, 2, "abcde", 1, 4, 1);
+    test("abcde", 2, 2, "abcde", 1, 5, 1);
+    test("abcde", 2, 2, "abcde", 2, 0, 2);
+    test("abcde", 2, 2, "abcde", 2, 1, 1);
+    test("abcde", 2, 2, "abcde", 2, 2, 0);
+    test("abcde", 2, 2, "abcde", 2, 3, -1);
+    test("abcde", 2, 2, "abcde", 2, 4, -1);
+    test("abcde", 2, 2, "abcde", 4, 0, 2);
+    test("abcde", 2, 2, "abcde", 4, 1, -2);
+    test("abcde", 2, 2, "abcde", 4, 2, -2);
+    test("abcde", 2, 2, "abcde", 5, 0, 2);
+    test("abcde", 2, 2, "abcde", 5, 1, 2);
+    test("abcde", 2, 2, "abcde", 6, 0, 0);
+    test("abcde", 2, 2, "abcdefghij", 0, 0, 2);
+    test("abcde", 2, 2, "abcdefghij", 0, 1, 2);
+    test("abcde", 2, 2, "abcdefghij", 0, 5, 2);
+    test("abcde", 2, 2, "abcdefghij", 0, 9, 2);
+    test("abcde", 2, 2, "abcdefghij", 0, 10, 2);
+    test("abcde", 2, 2, "abcdefghij", 0, 11, 2);
+    test("abcde", 2, 2, "abcdefghij", 1, 0, 2);
+    test("abcde", 2, 2, "abcdefghij", 1, 1, 1);
+    test("abcde", 2, 2, "abcdefghij", 1, 4, 1);
+    test("abcde", 2, 2, "abcdefghij", 1, 8, 1);
+    test("abcde", 2, 2, "abcdefghij", 1, 9, 1);
+    test("abcde", 2, 2, "abcdefghij", 1, 10, 1);
+    test("abcde", 2, 2, "abcdefghij", 5, 0, 2);
+    test("abcde", 2, 2, "abcdefghij", 5, 1, -3);
+    test("abcde", 2, 2, "abcdefghij", 5, 2, -3);
+    test("abcde", 2, 2, "abcdefghij", 5, 4, -3);
+}
+
+void test13()
+{
+    test("abcde", 2, 2, "abcdefghij", 5, 5, -3);
+    test("abcde", 2, 2, "abcdefghij", 5, 6, -3);
+    test("abcde", 2, 2, "abcdefghij", 9, 0, 2);
+    test("abcde", 2, 2, "abcdefghij", 9, 1, -7);
+    test("abcde", 2, 2, "abcdefghij", 9, 2, -7);
+    test("abcde", 2, 2, "abcdefghij", 10, 0, 2);
+    test("abcde", 2, 2, "abcdefghij", 10, 1, 2);
+    test("abcde", 2, 2, "abcdefghij", 11, 0, 0);
+    test("abcde", 2, 2, "abcdefghijklmnopqrst", 0, 0, 2);
+    test("abcde", 2, 2, "abcdefghijklmnopqrst", 0, 1, 2);
+    test("abcde", 2, 2, "abcdefghijklmnopqrst", 0, 10, 2);
+    test("abcde", 2, 2, "abcdefghijklmnopqrst", 0, 19, 2);
+    test("abcde", 2, 2, "abcdefghijklmnopqrst", 0, 20, 2);
+    test("abcde", 2, 2, "abcdefghijklmnopqrst", 0, 21, 2);
+    test("abcde", 2, 2, "abcdefghijklmnopqrst", 1, 0, 2);
+    test("abcde", 2, 2, "abcdefghijklmnopqrst", 1, 1, 1);
+    test("abcde", 2, 2, "abcdefghijklmnopqrst", 1, 9, 1);
+    test("abcde", 2, 2, "abcdefghijklmnopqrst", 1, 18, 1);
+    test("abcde", 2, 2, "abcdefghijklmnopqrst", 1, 19, 1);
+    test("abcde", 2, 2, "abcdefghijklmnopqrst", 1, 20, 1);
+    test("abcde", 2, 2, "abcdefghijklmnopqrst", 10, 0, 2);
+    test("abcde", 2, 2, "abcdefghijklmnopqrst", 10, 1, -8);
+    test("abcde", 2, 2, "abcdefghijklmnopqrst", 10, 5, -8);
+    test("abcde", 2, 2, "abcdefghijklmnopqrst", 10, 9, -8);
+    test("abcde", 2, 2, "abcdefghijklmnopqrst", 10, 10, -8);
+    test("abcde", 2, 2, "abcdefghijklmnopqrst", 10, 11, -8);
+    test("abcde", 2, 2, "abcdefghijklmnopqrst", 19, 0, 2);
+    test("abcde", 2, 2, "abcdefghijklmnopqrst", 19, 1, -17);
+    test("abcde", 2, 2, "abcdefghijklmnopqrst", 19, 2, -17);
+    test("abcde", 2, 2, "abcdefghijklmnopqrst", 20, 0, 2);
+    test("abcde", 2, 2, "abcdefghijklmnopqrst", 20, 1, 2);
+    test("abcde", 2, 2, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcde", 2, 3, "", 0, 0, 3);
+    test("abcde", 2, 3, "", 0, 1, 3);
+    test("abcde", 2, 3, "", 1, 0, 0);
+    test("abcde", 2, 3, "abcde", 0, 0, 3);
+    test("abcde", 2, 3, "abcde", 0, 1, 2);
+    test("abcde", 2, 3, "abcde", 0, 2, 2);
+    test("abcde", 2, 3, "abcde", 0, 4, 2);
+    test("abcde", 2, 3, "abcde", 0, 5, 2);
+    test("abcde", 2, 3, "abcde", 0, 6, 2);
+    test("abcde", 2, 3, "abcde", 1, 0, 3);
+    test("abcde", 2, 3, "abcde", 1, 1, 1);
+    test("abcde", 2, 3, "abcde", 1, 2, 1);
+    test("abcde", 2, 3, "abcde", 1, 3, 1);
+    test("abcde", 2, 3, "abcde", 1, 4, 1);
+    test("abcde", 2, 3, "abcde", 1, 5, 1);
+    test("abcde", 2, 3, "abcde", 2, 0, 3);
+    test("abcde", 2, 3, "abcde", 2, 1, 2);
+    test("abcde", 2, 3, "abcde", 2, 2, 1);
+    test("abcde", 2, 3, "abcde", 2, 3, 0);
+    test("abcde", 2, 3, "abcde", 2, 4, 0);
+    test("abcde", 2, 3, "abcde", 4, 0, 3);
+    test("abcde", 2, 3, "abcde", 4, 1, -2);
+    test("abcde", 2, 3, "abcde", 4, 2, -2);
+    test("abcde", 2, 3, "abcde", 5, 0, 3);
+    test("abcde", 2, 3, "abcde", 5, 1, 3);
+    test("abcde", 2, 3, "abcde", 6, 0, 0);
+    test("abcde", 2, 3, "abcdefghij", 0, 0, 3);
+    test("abcde", 2, 3, "abcdefghij", 0, 1, 2);
+    test("abcde", 2, 3, "abcdefghij", 0, 5, 2);
+    test("abcde", 2, 3, "abcdefghij", 0, 9, 2);
+    test("abcde", 2, 3, "abcdefghij", 0, 10, 2);
+    test("abcde", 2, 3, "abcdefghij", 0, 11, 2);
+    test("abcde", 2, 3, "abcdefghij", 1, 0, 3);
+    test("abcde", 2, 3, "abcdefghij", 1, 1, 1);
+    test("abcde", 2, 3, "abcdefghij", 1, 4, 1);
+    test("abcde", 2, 3, "abcdefghij", 1, 8, 1);
+    test("abcde", 2, 3, "abcdefghij", 1, 9, 1);
+    test("abcde", 2, 3, "abcdefghij", 1, 10, 1);
+    test("abcde", 2, 3, "abcdefghij", 5, 0, 3);
+    test("abcde", 2, 3, "abcdefghij", 5, 1, -3);
+    test("abcde", 2, 3, "abcdefghij", 5, 2, -3);
+    test("abcde", 2, 3, "abcdefghij", 5, 4, -3);
+    test("abcde", 2, 3, "abcdefghij", 5, 5, -3);
+    test("abcde", 2, 3, "abcdefghij", 5, 6, -3);
+    test("abcde", 2, 3, "abcdefghij", 9, 0, 3);
+    test("abcde", 2, 3, "abcdefghij", 9, 1, -7);
+    test("abcde", 2, 3, "abcdefghij", 9, 2, -7);
+    test("abcde", 2, 3, "abcdefghij", 10, 0, 3);
+    test("abcde", 2, 3, "abcdefghij", 10, 1, 3);
+    test("abcde", 2, 3, "abcdefghij", 11, 0, 0);
+    test("abcde", 2, 3, "abcdefghijklmnopqrst", 0, 0, 3);
+    test("abcde", 2, 3, "abcdefghijklmnopqrst", 0, 1, 2);
+    test("abcde", 2, 3, "abcdefghijklmnopqrst", 0, 10, 2);
+    test("abcde", 2, 3, "abcdefghijklmnopqrst", 0, 19, 2);
+    test("abcde", 2, 3, "abcdefghijklmnopqrst", 0, 20, 2);
+    test("abcde", 2, 3, "abcdefghijklmnopqrst", 0, 21, 2);
+    test("abcde", 2, 3, "abcdefghijklmnopqrst", 1, 0, 3);
+    test("abcde", 2, 3, "abcdefghijklmnopqrst", 1, 1, 1);
+    test("abcde", 2, 3, "abcdefghijklmnopqrst", 1, 9, 1);
+    test("abcde", 2, 3, "abcdefghijklmnopqrst", 1, 18, 1);
+    test("abcde", 2, 3, "abcdefghijklmnopqrst", 1, 19, 1);
+    test("abcde", 2, 3, "abcdefghijklmnopqrst", 1, 20, 1);
+    test("abcde", 2, 3, "abcdefghijklmnopqrst", 10, 0, 3);
+    test("abcde", 2, 3, "abcdefghijklmnopqrst", 10, 1, -8);
+    test("abcde", 2, 3, "abcdefghijklmnopqrst", 10, 5, -8);
+    test("abcde", 2, 3, "abcdefghijklmnopqrst", 10, 9, -8);
+    test("abcde", 2, 3, "abcdefghijklmnopqrst", 10, 10, -8);
+    test("abcde", 2, 3, "abcdefghijklmnopqrst", 10, 11, -8);
+}
+
+void test14()
+{
+    test("abcde", 2, 3, "abcdefghijklmnopqrst", 19, 0, 3);
+    test("abcde", 2, 3, "abcdefghijklmnopqrst", 19, 1, -17);
+    test("abcde", 2, 3, "abcdefghijklmnopqrst", 19, 2, -17);
+    test("abcde", 2, 3, "abcdefghijklmnopqrst", 20, 0, 3);
+    test("abcde", 2, 3, "abcdefghijklmnopqrst", 20, 1, 3);
+    test("abcde", 2, 3, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcde", 2, 4, "", 0, 0, 3);
+    test("abcde", 2, 4, "", 0, 1, 3);
+    test("abcde", 2, 4, "", 1, 0, 0);
+    test("abcde", 2, 4, "abcde", 0, 0, 3);
+    test("abcde", 2, 4, "abcde", 0, 1, 2);
+    test("abcde", 2, 4, "abcde", 0, 2, 2);
+    test("abcde", 2, 4, "abcde", 0, 4, 2);
+    test("abcde", 2, 4, "abcde", 0, 5, 2);
+    test("abcde", 2, 4, "abcde", 0, 6, 2);
+    test("abcde", 2, 4, "abcde", 1, 0, 3);
+    test("abcde", 2, 4, "abcde", 1, 1, 1);
+    test("abcde", 2, 4, "abcde", 1, 2, 1);
+    test("abcde", 2, 4, "abcde", 1, 3, 1);
+    test("abcde", 2, 4, "abcde", 1, 4, 1);
+    test("abcde", 2, 4, "abcde", 1, 5, 1);
+    test("abcde", 2, 4, "abcde", 2, 0, 3);
+    test("abcde", 2, 4, "abcde", 2, 1, 2);
+    test("abcde", 2, 4, "abcde", 2, 2, 1);
+    test("abcde", 2, 4, "abcde", 2, 3, 0);
+    test("abcde", 2, 4, "abcde", 2, 4, 0);
+    test("abcde", 2, 4, "abcde", 4, 0, 3);
+    test("abcde", 2, 4, "abcde", 4, 1, -2);
+    test("abcde", 2, 4, "abcde", 4, 2, -2);
+    test("abcde", 2, 4, "abcde", 5, 0, 3);
+    test("abcde", 2, 4, "abcde", 5, 1, 3);
+    test("abcde", 2, 4, "abcde", 6, 0, 0);
+    test("abcde", 2, 4, "abcdefghij", 0, 0, 3);
+    test("abcde", 2, 4, "abcdefghij", 0, 1, 2);
+    test("abcde", 2, 4, "abcdefghij", 0, 5, 2);
+    test("abcde", 2, 4, "abcdefghij", 0, 9, 2);
+    test("abcde", 2, 4, "abcdefghij", 0, 10, 2);
+    test("abcde", 2, 4, "abcdefghij", 0, 11, 2);
+    test("abcde", 2, 4, "abcdefghij", 1, 0, 3);
+    test("abcde", 2, 4, "abcdefghij", 1, 1, 1);
+    test("abcde", 2, 4, "abcdefghij", 1, 4, 1);
+    test("abcde", 2, 4, "abcdefghij", 1, 8, 1);
+    test("abcde", 2, 4, "abcdefghij", 1, 9, 1);
+    test("abcde", 2, 4, "abcdefghij", 1, 10, 1);
+    test("abcde", 2, 4, "abcdefghij", 5, 0, 3);
+    test("abcde", 2, 4, "abcdefghij", 5, 1, -3);
+    test("abcde", 2, 4, "abcdefghij", 5, 2, -3);
+    test("abcde", 2, 4, "abcdefghij", 5, 4, -3);
+    test("abcde", 2, 4, "abcdefghij", 5, 5, -3);
+    test("abcde", 2, 4, "abcdefghij", 5, 6, -3);
+    test("abcde", 2, 4, "abcdefghij", 9, 0, 3);
+    test("abcde", 2, 4, "abcdefghij", 9, 1, -7);
+    test("abcde", 2, 4, "abcdefghij", 9, 2, -7);
+    test("abcde", 2, 4, "abcdefghij", 10, 0, 3);
+    test("abcde", 2, 4, "abcdefghij", 10, 1, 3);
+    test("abcde", 2, 4, "abcdefghij", 11, 0, 0);
+    test("abcde", 2, 4, "abcdefghijklmnopqrst", 0, 0, 3);
+    test("abcde", 2, 4, "abcdefghijklmnopqrst", 0, 1, 2);
+    test("abcde", 2, 4, "abcdefghijklmnopqrst", 0, 10, 2);
+    test("abcde", 2, 4, "abcdefghijklmnopqrst", 0, 19, 2);
+    test("abcde", 2, 4, "abcdefghijklmnopqrst", 0, 20, 2);
+    test("abcde", 2, 4, "abcdefghijklmnopqrst", 0, 21, 2);
+    test("abcde", 2, 4, "abcdefghijklmnopqrst", 1, 0, 3);
+    test("abcde", 2, 4, "abcdefghijklmnopqrst", 1, 1, 1);
+    test("abcde", 2, 4, "abcdefghijklmnopqrst", 1, 9, 1);
+    test("abcde", 2, 4, "abcdefghijklmnopqrst", 1, 18, 1);
+    test("abcde", 2, 4, "abcdefghijklmnopqrst", 1, 19, 1);
+    test("abcde", 2, 4, "abcdefghijklmnopqrst", 1, 20, 1);
+    test("abcde", 2, 4, "abcdefghijklmnopqrst", 10, 0, 3);
+    test("abcde", 2, 4, "abcdefghijklmnopqrst", 10, 1, -8);
+    test("abcde", 2, 4, "abcdefghijklmnopqrst", 10, 5, -8);
+    test("abcde", 2, 4, "abcdefghijklmnopqrst", 10, 9, -8);
+    test("abcde", 2, 4, "abcdefghijklmnopqrst", 10, 10, -8);
+    test("abcde", 2, 4, "abcdefghijklmnopqrst", 10, 11, -8);
+    test("abcde", 2, 4, "abcdefghijklmnopqrst", 19, 0, 3);
+    test("abcde", 2, 4, "abcdefghijklmnopqrst", 19, 1, -17);
+    test("abcde", 2, 4, "abcdefghijklmnopqrst", 19, 2, -17);
+    test("abcde", 2, 4, "abcdefghijklmnopqrst", 20, 0, 3);
+    test("abcde", 2, 4, "abcdefghijklmnopqrst", 20, 1, 3);
+    test("abcde", 2, 4, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcde", 4, 0, "", 0, 0, 0);
+    test("abcde", 4, 0, "", 0, 1, 0);
+    test("abcde", 4, 0, "", 1, 0, 0);
+    test("abcde", 4, 0, "abcde", 0, 0, 0);
+    test("abcde", 4, 0, "abcde", 0, 1, -1);
+    test("abcde", 4, 0, "abcde", 0, 2, -2);
+    test("abcde", 4, 0, "abcde", 0, 4, -4);
+    test("abcde", 4, 0, "abcde", 0, 5, -5);
+    test("abcde", 4, 0, "abcde", 0, 6, -5);
+    test("abcde", 4, 0, "abcde", 1, 0, 0);
+    test("abcde", 4, 0, "abcde", 1, 1, -1);
+    test("abcde", 4, 0, "abcde", 1, 2, -2);
+    test("abcde", 4, 0, "abcde", 1, 3, -3);
+    test("abcde", 4, 0, "abcde", 1, 4, -4);
+    test("abcde", 4, 0, "abcde", 1, 5, -4);
+    test("abcde", 4, 0, "abcde", 2, 0, 0);
+    test("abcde", 4, 0, "abcde", 2, 1, -1);
+    test("abcde", 4, 0, "abcde", 2, 2, -2);
+    test("abcde", 4, 0, "abcde", 2, 3, -3);
+    test("abcde", 4, 0, "abcde", 2, 4, -3);
+}
+
+void test15()
+{
+    test("abcde", 4, 0, "abcde", 4, 0, 0);
+    test("abcde", 4, 0, "abcde", 4, 1, -1);
+    test("abcde", 4, 0, "abcde", 4, 2, -1);
+    test("abcde", 4, 0, "abcde", 5, 0, 0);
+    test("abcde", 4, 0, "abcde", 5, 1, 0);
+    test("abcde", 4, 0, "abcde", 6, 0, 0);
+    test("abcde", 4, 0, "abcdefghij", 0, 0, 0);
+    test("abcde", 4, 0, "abcdefghij", 0, 1, -1);
+    test("abcde", 4, 0, "abcdefghij", 0, 5, -5);
+    test("abcde", 4, 0, "abcdefghij", 0, 9, -9);
+    test("abcde", 4, 0, "abcdefghij", 0, 10, -10);
+    test("abcde", 4, 0, "abcdefghij", 0, 11, -10);
+    test("abcde", 4, 0, "abcdefghij", 1, 0, 0);
+    test("abcde", 4, 0, "abcdefghij", 1, 1, -1);
+    test("abcde", 4, 0, "abcdefghij", 1, 4, -4);
+    test("abcde", 4, 0, "abcdefghij", 1, 8, -8);
+    test("abcde", 4, 0, "abcdefghij", 1, 9, -9);
+    test("abcde", 4, 0, "abcdefghij", 1, 10, -9);
+    test("abcde", 4, 0, "abcdefghij", 5, 0, 0);
+    test("abcde", 4, 0, "abcdefghij", 5, 1, -1);
+    test("abcde", 4, 0, "abcdefghij", 5, 2, -2);
+    test("abcde", 4, 0, "abcdefghij", 5, 4, -4);
+    test("abcde", 4, 0, "abcdefghij", 5, 5, -5);
+    test("abcde", 4, 0, "abcdefghij", 5, 6, -5);
+    test("abcde", 4, 0, "abcdefghij", 9, 0, 0);
+    test("abcde", 4, 0, "abcdefghij", 9, 1, -1);
+    test("abcde", 4, 0, "abcdefghij", 9, 2, -1);
+    test("abcde", 4, 0, "abcdefghij", 10, 0, 0);
+    test("abcde", 4, 0, "abcdefghij", 10, 1, 0);
+    test("abcde", 4, 0, "abcdefghij", 11, 0, 0);
+    test("abcde", 4, 0, "abcdefghijklmnopqrst", 0, 0, 0);
+    test("abcde", 4, 0, "abcdefghijklmnopqrst", 0, 1, -1);
+    test("abcde", 4, 0, "abcdefghijklmnopqrst", 0, 10, -10);
+    test("abcde", 4, 0, "abcdefghijklmnopqrst", 0, 19, -19);
+    test("abcde", 4, 0, "abcdefghijklmnopqrst", 0, 20, -20);
+    test("abcde", 4, 0, "abcdefghijklmnopqrst", 0, 21, -20);
+    test("abcde", 4, 0, "abcdefghijklmnopqrst", 1, 0, 0);
+    test("abcde", 4, 0, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("abcde", 4, 0, "abcdefghijklmnopqrst", 1, 9, -9);
+    test("abcde", 4, 0, "abcdefghijklmnopqrst", 1, 18, -18);
+    test("abcde", 4, 0, "abcdefghijklmnopqrst", 1, 19, -19);
+    test("abcde", 4, 0, "abcdefghijklmnopqrst", 1, 20, -19);
+    test("abcde", 4, 0, "abcdefghijklmnopqrst", 10, 0, 0);
+    test("abcde", 4, 0, "abcdefghijklmnopqrst", 10, 1, -1);
+    test("abcde", 4, 0, "abcdefghijklmnopqrst", 10, 5, -5);
+    test("abcde", 4, 0, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("abcde", 4, 0, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("abcde", 4, 0, "abcdefghijklmnopqrst", 10, 11, -10);
+    test("abcde", 4, 0, "abcdefghijklmnopqrst", 19, 0, 0);
+    test("abcde", 4, 0, "abcdefghijklmnopqrst", 19, 1, -1);
+    test("abcde", 4, 0, "abcdefghijklmnopqrst", 19, 2, -1);
+    test("abcde", 4, 0, "abcdefghijklmnopqrst", 20, 0, 0);
+    test("abcde", 4, 0, "abcdefghijklmnopqrst", 20, 1, 0);
+    test("abcde", 4, 0, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcde", 4, 1, "", 0, 0, 1);
+    test("abcde", 4, 1, "", 0, 1, 1);
+    test("abcde", 4, 1, "", 1, 0, 0);
+    test("abcde", 4, 1, "abcde", 0, 0, 1);
+    test("abcde", 4, 1, "abcde", 0, 1, 4);
+    test("abcde", 4, 1, "abcde", 0, 2, 4);
+    test("abcde", 4, 1, "abcde", 0, 4, 4);
+    test("abcde", 4, 1, "abcde", 0, 5, 4);
+    test("abcde", 4, 1, "abcde", 0, 6, 4);
+    test("abcde", 4, 1, "abcde", 1, 0, 1);
+    test("abcde", 4, 1, "abcde", 1, 1, 3);
+    test("abcde", 4, 1, "abcde", 1, 2, 3);
+    test("abcde", 4, 1, "abcde", 1, 3, 3);
+    test("abcde", 4, 1, "abcde", 1, 4, 3);
+    test("abcde", 4, 1, "abcde", 1, 5, 3);
+    test("abcde", 4, 1, "abcde", 2, 0, 1);
+    test("abcde", 4, 1, "abcde", 2, 1, 2);
+    test("abcde", 4, 1, "abcde", 2, 2, 2);
+    test("abcde", 4, 1, "abcde", 2, 3, 2);
+    test("abcde", 4, 1, "abcde", 2, 4, 2);
+    test("abcde", 4, 1, "abcde", 4, 0, 1);
+    test("abcde", 4, 1, "abcde", 4, 1, 0);
+    test("abcde", 4, 1, "abcde", 4, 2, 0);
+    test("abcde", 4, 1, "abcde", 5, 0, 1);
+    test("abcde", 4, 1, "abcde", 5, 1, 1);
+    test("abcde", 4, 1, "abcde", 6, 0, 0);
+    test("abcde", 4, 1, "abcdefghij", 0, 0, 1);
+    test("abcde", 4, 1, "abcdefghij", 0, 1, 4);
+    test("abcde", 4, 1, "abcdefghij", 0, 5, 4);
+    test("abcde", 4, 1, "abcdefghij", 0, 9, 4);
+    test("abcde", 4, 1, "abcdefghij", 0, 10, 4);
+    test("abcde", 4, 1, "abcdefghij", 0, 11, 4);
+    test("abcde", 4, 1, "abcdefghij", 1, 0, 1);
+    test("abcde", 4, 1, "abcdefghij", 1, 1, 3);
+    test("abcde", 4, 1, "abcdefghij", 1, 4, 3);
+    test("abcde", 4, 1, "abcdefghij", 1, 8, 3);
+    test("abcde", 4, 1, "abcdefghij", 1, 9, 3);
+    test("abcde", 4, 1, "abcdefghij", 1, 10, 3);
+    test("abcde", 4, 1, "abcdefghij", 5, 0, 1);
+    test("abcde", 4, 1, "abcdefghij", 5, 1, -1);
+    test("abcde", 4, 1, "abcdefghij", 5, 2, -1);
+    test("abcde", 4, 1, "abcdefghij", 5, 4, -1);
+    test("abcde", 4, 1, "abcdefghij", 5, 5, -1);
+    test("abcde", 4, 1, "abcdefghij", 5, 6, -1);
+    test("abcde", 4, 1, "abcdefghij", 9, 0, 1);
+    test("abcde", 4, 1, "abcdefghij", 9, 1, -5);
+}
+
+void test16()
+{
+    test("abcde", 4, 1, "abcdefghij", 9, 2, -5);
+    test("abcde", 4, 1, "abcdefghij", 10, 0, 1);
+    test("abcde", 4, 1, "abcdefghij", 10, 1, 1);
+    test("abcde", 4, 1, "abcdefghij", 11, 0, 0);
+    test("abcde", 4, 1, "abcdefghijklmnopqrst", 0, 0, 1);
+    test("abcde", 4, 1, "abcdefghijklmnopqrst", 0, 1, 4);
+    test("abcde", 4, 1, "abcdefghijklmnopqrst", 0, 10, 4);
+    test("abcde", 4, 1, "abcdefghijklmnopqrst", 0, 19, 4);
+    test("abcde", 4, 1, "abcdefghijklmnopqrst", 0, 20, 4);
+    test("abcde", 4, 1, "abcdefghijklmnopqrst", 0, 21, 4);
+    test("abcde", 4, 1, "abcdefghijklmnopqrst", 1, 0, 1);
+    test("abcde", 4, 1, "abcdefghijklmnopqrst", 1, 1, 3);
+    test("abcde", 4, 1, "abcdefghijklmnopqrst", 1, 9, 3);
+    test("abcde", 4, 1, "abcdefghijklmnopqrst", 1, 18, 3);
+    test("abcde", 4, 1, "abcdefghijklmnopqrst", 1, 19, 3);
+    test("abcde", 4, 1, "abcdefghijklmnopqrst", 1, 20, 3);
+    test("abcde", 4, 1, "abcdefghijklmnopqrst", 10, 0, 1);
+    test("abcde", 4, 1, "abcdefghijklmnopqrst", 10, 1, -6);
+    test("abcde", 4, 1, "abcdefghijklmnopqrst", 10, 5, -6);
+    test("abcde", 4, 1, "abcdefghijklmnopqrst", 10, 9, -6);
+    test("abcde", 4, 1, "abcdefghijklmnopqrst", 10, 10, -6);
+    test("abcde", 4, 1, "abcdefghijklmnopqrst", 10, 11, -6);
+    test("abcde", 4, 1, "abcdefghijklmnopqrst", 19, 0, 1);
+    test("abcde", 4, 1, "abcdefghijklmnopqrst", 19, 1, -15);
+    test("abcde", 4, 1, "abcdefghijklmnopqrst", 19, 2, -15);
+    test("abcde", 4, 1, "abcdefghijklmnopqrst", 20, 0, 1);
+    test("abcde", 4, 1, "abcdefghijklmnopqrst", 20, 1, 1);
+    test("abcde", 4, 1, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcde", 4, 2, "", 0, 0, 1);
+    test("abcde", 4, 2, "", 0, 1, 1);
+    test("abcde", 4, 2, "", 1, 0, 0);
+    test("abcde", 4, 2, "abcde", 0, 0, 1);
+    test("abcde", 4, 2, "abcde", 0, 1, 4);
+    test("abcde", 4, 2, "abcde", 0, 2, 4);
+    test("abcde", 4, 2, "abcde", 0, 4, 4);
+    test("abcde", 4, 2, "abcde", 0, 5, 4);
+    test("abcde", 4, 2, "abcde", 0, 6, 4);
+    test("abcde", 4, 2, "abcde", 1, 0, 1);
+    test("abcde", 4, 2, "abcde", 1, 1, 3);
+    test("abcde", 4, 2, "abcde", 1, 2, 3);
+    test("abcde", 4, 2, "abcde", 1, 3, 3);
+    test("abcde", 4, 2, "abcde", 1, 4, 3);
+    test("abcde", 4, 2, "abcde", 1, 5, 3);
+    test("abcde", 4, 2, "abcde", 2, 0, 1);
+    test("abcde", 4, 2, "abcde", 2, 1, 2);
+    test("abcde", 4, 2, "abcde", 2, 2, 2);
+    test("abcde", 4, 2, "abcde", 2, 3, 2);
+    test("abcde", 4, 2, "abcde", 2, 4, 2);
+    test("abcde", 4, 2, "abcde", 4, 0, 1);
+    test("abcde", 4, 2, "abcde", 4, 1, 0);
+    test("abcde", 4, 2, "abcde", 4, 2, 0);
+    test("abcde", 4, 2, "abcde", 5, 0, 1);
+    test("abcde", 4, 2, "abcde", 5, 1, 1);
+    test("abcde", 4, 2, "abcde", 6, 0, 0);
+    test("abcde", 4, 2, "abcdefghij", 0, 0, 1);
+    test("abcde", 4, 2, "abcdefghij", 0, 1, 4);
+    test("abcde", 4, 2, "abcdefghij", 0, 5, 4);
+    test("abcde", 4, 2, "abcdefghij", 0, 9, 4);
+    test("abcde", 4, 2, "abcdefghij", 0, 10, 4);
+    test("abcde", 4, 2, "abcdefghij", 0, 11, 4);
+    test("abcde", 4, 2, "abcdefghij", 1, 0, 1);
+    test("abcde", 4, 2, "abcdefghij", 1, 1, 3);
+    test("abcde", 4, 2, "abcdefghij", 1, 4, 3);
+    test("abcde", 4, 2, "abcdefghij", 1, 8, 3);
+    test("abcde", 4, 2, "abcdefghij", 1, 9, 3);
+    test("abcde", 4, 2, "abcdefghij", 1, 10, 3);
+    test("abcde", 4, 2, "abcdefghij", 5, 0, 1);
+    test("abcde", 4, 2, "abcdefghij", 5, 1, -1);
+    test("abcde", 4, 2, "abcdefghij", 5, 2, -1);
+    test("abcde", 4, 2, "abcdefghij", 5, 4, -1);
+    test("abcde", 4, 2, "abcdefghij", 5, 5, -1);
+    test("abcde", 4, 2, "abcdefghij", 5, 6, -1);
+    test("abcde", 4, 2, "abcdefghij", 9, 0, 1);
+    test("abcde", 4, 2, "abcdefghij", 9, 1, -5);
+    test("abcde", 4, 2, "abcdefghij", 9, 2, -5);
+    test("abcde", 4, 2, "abcdefghij", 10, 0, 1);
+    test("abcde", 4, 2, "abcdefghij", 10, 1, 1);
+    test("abcde", 4, 2, "abcdefghij", 11, 0, 0);
+    test("abcde", 4, 2, "abcdefghijklmnopqrst", 0, 0, 1);
+    test("abcde", 4, 2, "abcdefghijklmnopqrst", 0, 1, 4);
+    test("abcde", 4, 2, "abcdefghijklmnopqrst", 0, 10, 4);
+    test("abcde", 4, 2, "abcdefghijklmnopqrst", 0, 19, 4);
+    test("abcde", 4, 2, "abcdefghijklmnopqrst", 0, 20, 4);
+    test("abcde", 4, 2, "abcdefghijklmnopqrst", 0, 21, 4);
+    test("abcde", 4, 2, "abcdefghijklmnopqrst", 1, 0, 1);
+    test("abcde", 4, 2, "abcdefghijklmnopqrst", 1, 1, 3);
+    test("abcde", 4, 2, "abcdefghijklmnopqrst", 1, 9, 3);
+    test("abcde", 4, 2, "abcdefghijklmnopqrst", 1, 18, 3);
+    test("abcde", 4, 2, "abcdefghijklmnopqrst", 1, 19, 3);
+    test("abcde", 4, 2, "abcdefghijklmnopqrst", 1, 20, 3);
+    test("abcde", 4, 2, "abcdefghijklmnopqrst", 10, 0, 1);
+    test("abcde", 4, 2, "abcdefghijklmnopqrst", 10, 1, -6);
+    test("abcde", 4, 2, "abcdefghijklmnopqrst", 10, 5, -6);
+    test("abcde", 4, 2, "abcdefghijklmnopqrst", 10, 9, -6);
+    test("abcde", 4, 2, "abcdefghijklmnopqrst", 10, 10, -6);
+    test("abcde", 4, 2, "abcdefghijklmnopqrst", 10, 11, -6);
+    test("abcde", 4, 2, "abcdefghijklmnopqrst", 19, 0, 1);
+    test("abcde", 4, 2, "abcdefghijklmnopqrst", 19, 1, -15);
+    test("abcde", 4, 2, "abcdefghijklmnopqrst", 19, 2, -15);
+    test("abcde", 4, 2, "abcdefghijklmnopqrst", 20, 0, 1);
+}
+
+void test17()
+{
+    test("abcde", 4, 2, "abcdefghijklmnopqrst", 20, 1, 1);
+    test("abcde", 4, 2, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcde", 5, 0, "", 0, 0, 0);
+    test("abcde", 5, 0, "", 0, 1, 0);
+    test("abcde", 5, 0, "", 1, 0, 0);
+    test("abcde", 5, 0, "abcde", 0, 0, 0);
+    test("abcde", 5, 0, "abcde", 0, 1, -1);
+    test("abcde", 5, 0, "abcde", 0, 2, -2);
+    test("abcde", 5, 0, "abcde", 0, 4, -4);
+    test("abcde", 5, 0, "abcde", 0, 5, -5);
+    test("abcde", 5, 0, "abcde", 0, 6, -5);
+    test("abcde", 5, 0, "abcde", 1, 0, 0);
+    test("abcde", 5, 0, "abcde", 1, 1, -1);
+    test("abcde", 5, 0, "abcde", 1, 2, -2);
+    test("abcde", 5, 0, "abcde", 1, 3, -3);
+    test("abcde", 5, 0, "abcde", 1, 4, -4);
+    test("abcde", 5, 0, "abcde", 1, 5, -4);
+    test("abcde", 5, 0, "abcde", 2, 0, 0);
+    test("abcde", 5, 0, "abcde", 2, 1, -1);
+    test("abcde", 5, 0, "abcde", 2, 2, -2);
+    test("abcde", 5, 0, "abcde", 2, 3, -3);
+    test("abcde", 5, 0, "abcde", 2, 4, -3);
+    test("abcde", 5, 0, "abcde", 4, 0, 0);
+    test("abcde", 5, 0, "abcde", 4, 1, -1);
+    test("abcde", 5, 0, "abcde", 4, 2, -1);
+    test("abcde", 5, 0, "abcde", 5, 0, 0);
+    test("abcde", 5, 0, "abcde", 5, 1, 0);
+    test("abcde", 5, 0, "abcde", 6, 0, 0);
+    test("abcde", 5, 0, "abcdefghij", 0, 0, 0);
+    test("abcde", 5, 0, "abcdefghij", 0, 1, -1);
+    test("abcde", 5, 0, "abcdefghij", 0, 5, -5);
+    test("abcde", 5, 0, "abcdefghij", 0, 9, -9);
+    test("abcde", 5, 0, "abcdefghij", 0, 10, -10);
+    test("abcde", 5, 0, "abcdefghij", 0, 11, -10);
+    test("abcde", 5, 0, "abcdefghij", 1, 0, 0);
+    test("abcde", 5, 0, "abcdefghij", 1, 1, -1);
+    test("abcde", 5, 0, "abcdefghij", 1, 4, -4);
+    test("abcde", 5, 0, "abcdefghij", 1, 8, -8);
+    test("abcde", 5, 0, "abcdefghij", 1, 9, -9);
+    test("abcde", 5, 0, "abcdefghij", 1, 10, -9);
+    test("abcde", 5, 0, "abcdefghij", 5, 0, 0);
+    test("abcde", 5, 0, "abcdefghij", 5, 1, -1);
+    test("abcde", 5, 0, "abcdefghij", 5, 2, -2);
+    test("abcde", 5, 0, "abcdefghij", 5, 4, -4);
+    test("abcde", 5, 0, "abcdefghij", 5, 5, -5);
+    test("abcde", 5, 0, "abcdefghij", 5, 6, -5);
+    test("abcde", 5, 0, "abcdefghij", 9, 0, 0);
+    test("abcde", 5, 0, "abcdefghij", 9, 1, -1);
+    test("abcde", 5, 0, "abcdefghij", 9, 2, -1);
+    test("abcde", 5, 0, "abcdefghij", 10, 0, 0);
+    test("abcde", 5, 0, "abcdefghij", 10, 1, 0);
+    test("abcde", 5, 0, "abcdefghij", 11, 0, 0);
+    test("abcde", 5, 0, "abcdefghijklmnopqrst", 0, 0, 0);
+    test("abcde", 5, 0, "abcdefghijklmnopqrst", 0, 1, -1);
+    test("abcde", 5, 0, "abcdefghijklmnopqrst", 0, 10, -10);
+    test("abcde", 5, 0, "abcdefghijklmnopqrst", 0, 19, -19);
+    test("abcde", 5, 0, "abcdefghijklmnopqrst", 0, 20, -20);
+    test("abcde", 5, 0, "abcdefghijklmnopqrst", 0, 21, -20);
+    test("abcde", 5, 0, "abcdefghijklmnopqrst", 1, 0, 0);
+    test("abcde", 5, 0, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("abcde", 5, 0, "abcdefghijklmnopqrst", 1, 9, -9);
+    test("abcde", 5, 0, "abcdefghijklmnopqrst", 1, 18, -18);
+    test("abcde", 5, 0, "abcdefghijklmnopqrst", 1, 19, -19);
+    test("abcde", 5, 0, "abcdefghijklmnopqrst", 1, 20, -19);
+    test("abcde", 5, 0, "abcdefghijklmnopqrst", 10, 0, 0);
+    test("abcde", 5, 0, "abcdefghijklmnopqrst", 10, 1, -1);
+    test("abcde", 5, 0, "abcdefghijklmnopqrst", 10, 5, -5);
+    test("abcde", 5, 0, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("abcde", 5, 0, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("abcde", 5, 0, "abcdefghijklmnopqrst", 10, 11, -10);
+    test("abcde", 5, 0, "abcdefghijklmnopqrst", 19, 0, 0);
+    test("abcde", 5, 0, "abcdefghijklmnopqrst", 19, 1, -1);
+    test("abcde", 5, 0, "abcdefghijklmnopqrst", 19, 2, -1);
+    test("abcde", 5, 0, "abcdefghijklmnopqrst", 20, 0, 0);
+    test("abcde", 5, 0, "abcdefghijklmnopqrst", 20, 1, 0);
+    test("abcde", 5, 0, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcde", 5, 1, "", 0, 0, 0);
+    test("abcde", 5, 1, "", 0, 1, 0);
+    test("abcde", 5, 1, "", 1, 0, 0);
+    test("abcde", 5, 1, "abcde", 0, 0, 0);
+    test("abcde", 5, 1, "abcde", 0, 1, -1);
+    test("abcde", 5, 1, "abcde", 0, 2, -2);
+    test("abcde", 5, 1, "abcde", 0, 4, -4);
+    test("abcde", 5, 1, "abcde", 0, 5, -5);
+    test("abcde", 5, 1, "abcde", 0, 6, -5);
+    test("abcde", 5, 1, "abcde", 1, 0, 0);
+    test("abcde", 5, 1, "abcde", 1, 1, -1);
+    test("abcde", 5, 1, "abcde", 1, 2, -2);
+    test("abcde", 5, 1, "abcde", 1, 3, -3);
+    test("abcde", 5, 1, "abcde", 1, 4, -4);
+    test("abcde", 5, 1, "abcde", 1, 5, -4);
+    test("abcde", 5, 1, "abcde", 2, 0, 0);
+    test("abcde", 5, 1, "abcde", 2, 1, -1);
+    test("abcde", 5, 1, "abcde", 2, 2, -2);
+    test("abcde", 5, 1, "abcde", 2, 3, -3);
+    test("abcde", 5, 1, "abcde", 2, 4, -3);
+    test("abcde", 5, 1, "abcde", 4, 0, 0);
+    test("abcde", 5, 1, "abcde", 4, 1, -1);
+    test("abcde", 5, 1, "abcde", 4, 2, -1);
+    test("abcde", 5, 1, "abcde", 5, 0, 0);
+}
+
+void test18()
+{
+    test("abcde", 5, 1, "abcde", 5, 1, 0);
+    test("abcde", 5, 1, "abcde", 6, 0, 0);
+    test("abcde", 5, 1, "abcdefghij", 0, 0, 0);
+    test("abcde", 5, 1, "abcdefghij", 0, 1, -1);
+    test("abcde", 5, 1, "abcdefghij", 0, 5, -5);
+    test("abcde", 5, 1, "abcdefghij", 0, 9, -9);
+    test("abcde", 5, 1, "abcdefghij", 0, 10, -10);
+    test("abcde", 5, 1, "abcdefghij", 0, 11, -10);
+    test("abcde", 5, 1, "abcdefghij", 1, 0, 0);
+    test("abcde", 5, 1, "abcdefghij", 1, 1, -1);
+    test("abcde", 5, 1, "abcdefghij", 1, 4, -4);
+    test("abcde", 5, 1, "abcdefghij", 1, 8, -8);
+    test("abcde", 5, 1, "abcdefghij", 1, 9, -9);
+    test("abcde", 5, 1, "abcdefghij", 1, 10, -9);
+    test("abcde", 5, 1, "abcdefghij", 5, 0, 0);
+    test("abcde", 5, 1, "abcdefghij", 5, 1, -1);
+    test("abcde", 5, 1, "abcdefghij", 5, 2, -2);
+    test("abcde", 5, 1, "abcdefghij", 5, 4, -4);
+    test("abcde", 5, 1, "abcdefghij", 5, 5, -5);
+    test("abcde", 5, 1, "abcdefghij", 5, 6, -5);
+    test("abcde", 5, 1, "abcdefghij", 9, 0, 0);
+    test("abcde", 5, 1, "abcdefghij", 9, 1, -1);
+    test("abcde", 5, 1, "abcdefghij", 9, 2, -1);
+    test("abcde", 5, 1, "abcdefghij", 10, 0, 0);
+    test("abcde", 5, 1, "abcdefghij", 10, 1, 0);
+    test("abcde", 5, 1, "abcdefghij", 11, 0, 0);
+    test("abcde", 5, 1, "abcdefghijklmnopqrst", 0, 0, 0);
+    test("abcde", 5, 1, "abcdefghijklmnopqrst", 0, 1, -1);
+    test("abcde", 5, 1, "abcdefghijklmnopqrst", 0, 10, -10);
+    test("abcde", 5, 1, "abcdefghijklmnopqrst", 0, 19, -19);
+    test("abcde", 5, 1, "abcdefghijklmnopqrst", 0, 20, -20);
+    test("abcde", 5, 1, "abcdefghijklmnopqrst", 0, 21, -20);
+    test("abcde", 5, 1, "abcdefghijklmnopqrst", 1, 0, 0);
+    test("abcde", 5, 1, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("abcde", 5, 1, "abcdefghijklmnopqrst", 1, 9, -9);
+    test("abcde", 5, 1, "abcdefghijklmnopqrst", 1, 18, -18);
+    test("abcde", 5, 1, "abcdefghijklmnopqrst", 1, 19, -19);
+    test("abcde", 5, 1, "abcdefghijklmnopqrst", 1, 20, -19);
+    test("abcde", 5, 1, "abcdefghijklmnopqrst", 10, 0, 0);
+    test("abcde", 5, 1, "abcdefghijklmnopqrst", 10, 1, -1);
+    test("abcde", 5, 1, "abcdefghijklmnopqrst", 10, 5, -5);
+    test("abcde", 5, 1, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("abcde", 5, 1, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("abcde", 5, 1, "abcdefghijklmnopqrst", 10, 11, -10);
+    test("abcde", 5, 1, "abcdefghijklmnopqrst", 19, 0, 0);
+    test("abcde", 5, 1, "abcdefghijklmnopqrst", 19, 1, -1);
+    test("abcde", 5, 1, "abcdefghijklmnopqrst", 19, 2, -1);
+    test("abcde", 5, 1, "abcdefghijklmnopqrst", 20, 0, 0);
+    test("abcde", 5, 1, "abcdefghijklmnopqrst", 20, 1, 0);
+    test("abcde", 5, 1, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcde", 6, 0, "", 0, 0, 0);
+    test("abcde", 6, 0, "", 0, 1, 0);
+    test("abcde", 6, 0, "", 1, 0, 0);
+    test("abcde", 6, 0, "abcde", 0, 0, 0);
+    test("abcde", 6, 0, "abcde", 0, 1, 0);
+    test("abcde", 6, 0, "abcde", 0, 2, 0);
+    test("abcde", 6, 0, "abcde", 0, 4, 0);
+    test("abcde", 6, 0, "abcde", 0, 5, 0);
+    test("abcde", 6, 0, "abcde", 0, 6, 0);
+    test("abcde", 6, 0, "abcde", 1, 0, 0);
+    test("abcde", 6, 0, "abcde", 1, 1, 0);
+    test("abcde", 6, 0, "abcde", 1, 2, 0);
+    test("abcde", 6, 0, "abcde", 1, 3, 0);
+    test("abcde", 6, 0, "abcde", 1, 4, 0);
+    test("abcde", 6, 0, "abcde", 1, 5, 0);
+    test("abcde", 6, 0, "abcde", 2, 0, 0);
+    test("abcde", 6, 0, "abcde", 2, 1, 0);
+    test("abcde", 6, 0, "abcde", 2, 2, 0);
+    test("abcde", 6, 0, "abcde", 2, 3, 0);
+    test("abcde", 6, 0, "abcde", 2, 4, 0);
+    test("abcde", 6, 0, "abcde", 4, 0, 0);
+    test("abcde", 6, 0, "abcde", 4, 1, 0);
+    test("abcde", 6, 0, "abcde", 4, 2, 0);
+    test("abcde", 6, 0, "abcde", 5, 0, 0);
+    test("abcde", 6, 0, "abcde", 5, 1, 0);
+    test("abcde", 6, 0, "abcde", 6, 0, 0);
+    test("abcde", 6, 0, "abcdefghij", 0, 0, 0);
+    test("abcde", 6, 0, "abcdefghij", 0, 1, 0);
+    test("abcde", 6, 0, "abcdefghij", 0, 5, 0);
+    test("abcde", 6, 0, "abcdefghij", 0, 9, 0);
+    test("abcde", 6, 0, "abcdefghij", 0, 10, 0);
+    test("abcde", 6, 0, "abcdefghij", 0, 11, 0);
+    test("abcde", 6, 0, "abcdefghij", 1, 0, 0);
+    test("abcde", 6, 0, "abcdefghij", 1, 1, 0);
+    test("abcde", 6, 0, "abcdefghij", 1, 4, 0);
+    test("abcde", 6, 0, "abcdefghij", 1, 8, 0);
+    test("abcde", 6, 0, "abcdefghij", 1, 9, 0);
+    test("abcde", 6, 0, "abcdefghij", 1, 10, 0);
+    test("abcde", 6, 0, "abcdefghij", 5, 0, 0);
+    test("abcde", 6, 0, "abcdefghij", 5, 1, 0);
+    test("abcde", 6, 0, "abcdefghij", 5, 2, 0);
+    test("abcde", 6, 0, "abcdefghij", 5, 4, 0);
+    test("abcde", 6, 0, "abcdefghij", 5, 5, 0);
+    test("abcde", 6, 0, "abcdefghij", 5, 6, 0);
+    test("abcde", 6, 0, "abcdefghij", 9, 0, 0);
+    test("abcde", 6, 0, "abcdefghij", 9, 1, 0);
+    test("abcde", 6, 0, "abcdefghij", 9, 2, 0);
+    test("abcde", 6, 0, "abcdefghij", 10, 0, 0);
+    test("abcde", 6, 0, "abcdefghij", 10, 1, 0);
+    test("abcde", 6, 0, "abcdefghij", 11, 0, 0);
+}
+
+void test19()
+{
+    test("abcde", 6, 0, "abcdefghijklmnopqrst", 0, 0, 0);
+    test("abcde", 6, 0, "abcdefghijklmnopqrst", 0, 1, 0);
+    test("abcde", 6, 0, "abcdefghijklmnopqrst", 0, 10, 0);
+    test("abcde", 6, 0, "abcdefghijklmnopqrst", 0, 19, 0);
+    test("abcde", 6, 0, "abcdefghijklmnopqrst", 0, 20, 0);
+    test("abcde", 6, 0, "abcdefghijklmnopqrst", 0, 21, 0);
+    test("abcde", 6, 0, "abcdefghijklmnopqrst", 1, 0, 0);
+    test("abcde", 6, 0, "abcdefghijklmnopqrst", 1, 1, 0);
+    test("abcde", 6, 0, "abcdefghijklmnopqrst", 1, 9, 0);
+    test("abcde", 6, 0, "abcdefghijklmnopqrst", 1, 18, 0);
+    test("abcde", 6, 0, "abcdefghijklmnopqrst", 1, 19, 0);
+    test("abcde", 6, 0, "abcdefghijklmnopqrst", 1, 20, 0);
+    test("abcde", 6, 0, "abcdefghijklmnopqrst", 10, 0, 0);
+    test("abcde", 6, 0, "abcdefghijklmnopqrst", 10, 1, 0);
+    test("abcde", 6, 0, "abcdefghijklmnopqrst", 10, 5, 0);
+    test("abcde", 6, 0, "abcdefghijklmnopqrst", 10, 9, 0);
+    test("abcde", 6, 0, "abcdefghijklmnopqrst", 10, 10, 0);
+    test("abcde", 6, 0, "abcdefghijklmnopqrst", 10, 11, 0);
+    test("abcde", 6, 0, "abcdefghijklmnopqrst", 19, 0, 0);
+    test("abcde", 6, 0, "abcdefghijklmnopqrst", 19, 1, 0);
+    test("abcde", 6, 0, "abcdefghijklmnopqrst", 19, 2, 0);
+    test("abcde", 6, 0, "abcdefghijklmnopqrst", 20, 0, 0);
+    test("abcde", 6, 0, "abcdefghijklmnopqrst", 20, 1, 0);
+    test("abcde", 6, 0, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghij", 0, 0, "", 0, 0, 0);
+    test("abcdefghij", 0, 0, "", 0, 1, 0);
+    test("abcdefghij", 0, 0, "", 1, 0, 0);
+    test("abcdefghij", 0, 0, "abcde", 0, 0, 0);
+    test("abcdefghij", 0, 0, "abcde", 0, 1, -1);
+    test("abcdefghij", 0, 0, "abcde", 0, 2, -2);
+    test("abcdefghij", 0, 0, "abcde", 0, 4, -4);
+    test("abcdefghij", 0, 0, "abcde", 0, 5, -5);
+    test("abcdefghij", 0, 0, "abcde", 0, 6, -5);
+    test("abcdefghij", 0, 0, "abcde", 1, 0, 0);
+    test("abcdefghij", 0, 0, "abcde", 1, 1, -1);
+    test("abcdefghij", 0, 0, "abcde", 1, 2, -2);
+    test("abcdefghij", 0, 0, "abcde", 1, 3, -3);
+    test("abcdefghij", 0, 0, "abcde", 1, 4, -4);
+    test("abcdefghij", 0, 0, "abcde", 1, 5, -4);
+    test("abcdefghij", 0, 0, "abcde", 2, 0, 0);
+    test("abcdefghij", 0, 0, "abcde", 2, 1, -1);
+    test("abcdefghij", 0, 0, "abcde", 2, 2, -2);
+    test("abcdefghij", 0, 0, "abcde", 2, 3, -3);
+    test("abcdefghij", 0, 0, "abcde", 2, 4, -3);
+    test("abcdefghij", 0, 0, "abcde", 4, 0, 0);
+    test("abcdefghij", 0, 0, "abcde", 4, 1, -1);
+    test("abcdefghij", 0, 0, "abcde", 4, 2, -1);
+    test("abcdefghij", 0, 0, "abcde", 5, 0, 0);
+    test("abcdefghij", 0, 0, "abcde", 5, 1, 0);
+    test("abcdefghij", 0, 0, "abcde", 6, 0, 0);
+    test("abcdefghij", 0, 0, "abcdefghij", 0, 0, 0);
+    test("abcdefghij", 0, 0, "abcdefghij", 0, 1, -1);
+    test("abcdefghij", 0, 0, "abcdefghij", 0, 5, -5);
+    test("abcdefghij", 0, 0, "abcdefghij", 0, 9, -9);
+    test("abcdefghij", 0, 0, "abcdefghij", 0, 10, -10);
+    test("abcdefghij", 0, 0, "abcdefghij", 0, 11, -10);
+    test("abcdefghij", 0, 0, "abcdefghij", 1, 0, 0);
+    test("abcdefghij", 0, 0, "abcdefghij", 1, 1, -1);
+    test("abcdefghij", 0, 0, "abcdefghij", 1, 4, -4);
+    test("abcdefghij", 0, 0, "abcdefghij", 1, 8, -8);
+    test("abcdefghij", 0, 0, "abcdefghij", 1, 9, -9);
+    test("abcdefghij", 0, 0, "abcdefghij", 1, 10, -9);
+    test("abcdefghij", 0, 0, "abcdefghij", 5, 0, 0);
+    test("abcdefghij", 0, 0, "abcdefghij", 5, 1, -1);
+    test("abcdefghij", 0, 0, "abcdefghij", 5, 2, -2);
+    test("abcdefghij", 0, 0, "abcdefghij", 5, 4, -4);
+    test("abcdefghij", 0, 0, "abcdefghij", 5, 5, -5);
+    test("abcdefghij", 0, 0, "abcdefghij", 5, 6, -5);
+    test("abcdefghij", 0, 0, "abcdefghij", 9, 0, 0);
+    test("abcdefghij", 0, 0, "abcdefghij", 9, 1, -1);
+    test("abcdefghij", 0, 0, "abcdefghij", 9, 2, -1);
+    test("abcdefghij", 0, 0, "abcdefghij", 10, 0, 0);
+    test("abcdefghij", 0, 0, "abcdefghij", 10, 1, 0);
+    test("abcdefghij", 0, 0, "abcdefghij", 11, 0, 0);
+    test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", 0, 0, 0);
+    test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", 0, 1, -1);
+    test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", 0, 10, -10);
+    test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", 0, 19, -19);
+    test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", 0, 20, -20);
+    test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", 0, 21, -20);
+    test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", 1, 0, 0);
+    test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", 1, 9, -9);
+    test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", 1, 18, -18);
+    test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", 1, 19, -19);
+    test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", 1, 20, -19);
+    test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", 10, 0, 0);
+    test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", 10, 1, -1);
+    test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", 10, 5, -5);
+    test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", 10, 11, -10);
+    test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", 19, 0, 0);
+    test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", 19, 1, -1);
+    test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", 19, 2, -1);
+    test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", 20, 0, 0);
+    test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", 20, 1, 0);
+    test("abcdefghij", 0, 0, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghij", 0, 1, "", 0, 0, 1);
+    test("abcdefghij", 0, 1, "", 0, 1, 1);
+}
+
+void test20()
+{
+    test("abcdefghij", 0, 1, "", 1, 0, 0);
+    test("abcdefghij", 0, 1, "abcde", 0, 0, 1);
+    test("abcdefghij", 0, 1, "abcde", 0, 1, 0);
+    test("abcdefghij", 0, 1, "abcde", 0, 2, -1);
+    test("abcdefghij", 0, 1, "abcde", 0, 4, -3);
+    test("abcdefghij", 0, 1, "abcde", 0, 5, -4);
+    test("abcdefghij", 0, 1, "abcde", 0, 6, -4);
+    test("abcdefghij", 0, 1, "abcde", 1, 0, 1);
+    test("abcdefghij", 0, 1, "abcde", 1, 1, -1);
+    test("abcdefghij", 0, 1, "abcde", 1, 2, -1);
+    test("abcdefghij", 0, 1, "abcde", 1, 3, -1);
+    test("abcdefghij", 0, 1, "abcde", 1, 4, -1);
+    test("abcdefghij", 0, 1, "abcde", 1, 5, -1);
+    test("abcdefghij", 0, 1, "abcde", 2, 0, 1);
+    test("abcdefghij", 0, 1, "abcde", 2, 1, -2);
+    test("abcdefghij", 0, 1, "abcde", 2, 2, -2);
+    test("abcdefghij", 0, 1, "abcde", 2, 3, -2);
+    test("abcdefghij", 0, 1, "abcde", 2, 4, -2);
+    test("abcdefghij", 0, 1, "abcde", 4, 0, 1);
+    test("abcdefghij", 0, 1, "abcde", 4, 1, -4);
+    test("abcdefghij", 0, 1, "abcde", 4, 2, -4);
+    test("abcdefghij", 0, 1, "abcde", 5, 0, 1);
+    test("abcdefghij", 0, 1, "abcde", 5, 1, 1);
+    test("abcdefghij", 0, 1, "abcde", 6, 0, 0);
+    test("abcdefghij", 0, 1, "abcdefghij", 0, 0, 1);
+    test("abcdefghij", 0, 1, "abcdefghij", 0, 1, 0);
+    test("abcdefghij", 0, 1, "abcdefghij", 0, 5, -4);
+    test("abcdefghij", 0, 1, "abcdefghij", 0, 9, -8);
+    test("abcdefghij", 0, 1, "abcdefghij", 0, 10, -9);
+    test("abcdefghij", 0, 1, "abcdefghij", 0, 11, -9);
+    test("abcdefghij", 0, 1, "abcdefghij", 1, 0, 1);
+    test("abcdefghij", 0, 1, "abcdefghij", 1, 1, -1);
+    test("abcdefghij", 0, 1, "abcdefghij", 1, 4, -1);
+    test("abcdefghij", 0, 1, "abcdefghij", 1, 8, -1);
+    test("abcdefghij", 0, 1, "abcdefghij", 1, 9, -1);
+    test("abcdefghij", 0, 1, "abcdefghij", 1, 10, -1);
+    test("abcdefghij", 0, 1, "abcdefghij", 5, 0, 1);
+    test("abcdefghij", 0, 1, "abcdefghij", 5, 1, -5);
+    test("abcdefghij", 0, 1, "abcdefghij", 5, 2, -5);
+    test("abcdefghij", 0, 1, "abcdefghij", 5, 4, -5);
+    test("abcdefghij", 0, 1, "abcdefghij", 5, 5, -5);
+    test("abcdefghij", 0, 1, "abcdefghij", 5, 6, -5);
+    test("abcdefghij", 0, 1, "abcdefghij", 9, 0, 1);
+    test("abcdefghij", 0, 1, "abcdefghij", 9, 1, -9);
+    test("abcdefghij", 0, 1, "abcdefghij", 9, 2, -9);
+    test("abcdefghij", 0, 1, "abcdefghij", 10, 0, 1);
+    test("abcdefghij", 0, 1, "abcdefghij", 10, 1, 1);
+    test("abcdefghij", 0, 1, "abcdefghij", 11, 0, 0);
+    test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", 0, 0, 1);
+    test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", 0, 1, 0);
+    test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", 0, 10, -9);
+    test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", 0, 19, -18);
+    test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", 0, 20, -19);
+    test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", 0, 21, -19);
+    test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", 1, 0, 1);
+    test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", 1, 9, -1);
+    test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", 1, 18, -1);
+    test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", 1, 19, -1);
+    test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", 1, 20, -1);
+    test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", 10, 0, 1);
+    test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", 10, 1, -10);
+    test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", 10, 5, -10);
+    test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", 10, 9, -10);
+    test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", 10, 11, -10);
+    test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", 19, 0, 1);
+    test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", 19, 1, -19);
+    test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", 19, 2, -19);
+    test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", 20, 0, 1);
+    test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", 20, 1, 1);
+    test("abcdefghij", 0, 1, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghij", 0, 5, "", 0, 0, 5);
+    test("abcdefghij", 0, 5, "", 0, 1, 5);
+    test("abcdefghij", 0, 5, "", 1, 0, 0);
+    test("abcdefghij", 0, 5, "abcde", 0, 0, 5);
+    test("abcdefghij", 0, 5, "abcde", 0, 1, 4);
+    test("abcdefghij", 0, 5, "abcde", 0, 2, 3);
+    test("abcdefghij", 0, 5, "abcde", 0, 4, 1);
+    test("abcdefghij", 0, 5, "abcde", 0, 5, 0);
+    test("abcdefghij", 0, 5, "abcde", 0, 6, 0);
+    test("abcdefghij", 0, 5, "abcde", 1, 0, 5);
+    test("abcdefghij", 0, 5, "abcde", 1, 1, -1);
+    test("abcdefghij", 0, 5, "abcde", 1, 2, -1);
+    test("abcdefghij", 0, 5, "abcde", 1, 3, -1);
+    test("abcdefghij", 0, 5, "abcde", 1, 4, -1);
+    test("abcdefghij", 0, 5, "abcde", 1, 5, -1);
+    test("abcdefghij", 0, 5, "abcde", 2, 0, 5);
+    test("abcdefghij", 0, 5, "abcde", 2, 1, -2);
+    test("abcdefghij", 0, 5, "abcde", 2, 2, -2);
+    test("abcdefghij", 0, 5, "abcde", 2, 3, -2);
+    test("abcdefghij", 0, 5, "abcde", 2, 4, -2);
+    test("abcdefghij", 0, 5, "abcde", 4, 0, 5);
+    test("abcdefghij", 0, 5, "abcde", 4, 1, -4);
+    test("abcdefghij", 0, 5, "abcde", 4, 2, -4);
+    test("abcdefghij", 0, 5, "abcde", 5, 0, 5);
+    test("abcdefghij", 0, 5, "abcde", 5, 1, 5);
+    test("abcdefghij", 0, 5, "abcde", 6, 0, 0);
+    test("abcdefghij", 0, 5, "abcdefghij", 0, 0, 5);
+    test("abcdefghij", 0, 5, "abcdefghij", 0, 1, 4);
+}
+
+void test21()
+{
+    test("abcdefghij", 0, 5, "abcdefghij", 0, 5, 0);
+    test("abcdefghij", 0, 5, "abcdefghij", 0, 9, -4);
+    test("abcdefghij", 0, 5, "abcdefghij", 0, 10, -5);
+    test("abcdefghij", 0, 5, "abcdefghij", 0, 11, -5);
+    test("abcdefghij", 0, 5, "abcdefghij", 1, 0, 5);
+    test("abcdefghij", 0, 5, "abcdefghij", 1, 1, -1);
+    test("abcdefghij", 0, 5, "abcdefghij", 1, 4, -1);
+    test("abcdefghij", 0, 5, "abcdefghij", 1, 8, -1);
+    test("abcdefghij", 0, 5, "abcdefghij", 1, 9, -1);
+    test("abcdefghij", 0, 5, "abcdefghij", 1, 10, -1);
+    test("abcdefghij", 0, 5, "abcdefghij", 5, 0, 5);
+    test("abcdefghij", 0, 5, "abcdefghij", 5, 1, -5);
+    test("abcdefghij", 0, 5, "abcdefghij", 5, 2, -5);
+    test("abcdefghij", 0, 5, "abcdefghij", 5, 4, -5);
+    test("abcdefghij", 0, 5, "abcdefghij", 5, 5, -5);
+    test("abcdefghij", 0, 5, "abcdefghij", 5, 6, -5);
+    test("abcdefghij", 0, 5, "abcdefghij", 9, 0, 5);
+    test("abcdefghij", 0, 5, "abcdefghij", 9, 1, -9);
+    test("abcdefghij", 0, 5, "abcdefghij", 9, 2, -9);
+    test("abcdefghij", 0, 5, "abcdefghij", 10, 0, 5);
+    test("abcdefghij", 0, 5, "abcdefghij", 10, 1, 5);
+    test("abcdefghij", 0, 5, "abcdefghij", 11, 0, 0);
+    test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", 0, 0, 5);
+    test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", 0, 1, 4);
+    test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", 0, 10, -5);
+    test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", 0, 19, -14);
+    test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", 0, 20, -15);
+    test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", 0, 21, -15);
+    test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", 1, 0, 5);
+    test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", 1, 9, -1);
+    test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", 1, 18, -1);
+    test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", 1, 19, -1);
+    test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", 1, 20, -1);
+    test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", 10, 0, 5);
+    test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", 10, 1, -10);
+    test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", 10, 5, -10);
+    test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", 10, 9, -10);
+    test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", 10, 11, -10);
+    test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", 19, 0, 5);
+    test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", 19, 1, -19);
+    test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", 19, 2, -19);
+    test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", 20, 0, 5);
+    test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", 20, 1, 5);
+    test("abcdefghij", 0, 5, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghij", 0, 9, "", 0, 0, 9);
+    test("abcdefghij", 0, 9, "", 0, 1, 9);
+    test("abcdefghij", 0, 9, "", 1, 0, 0);
+    test("abcdefghij", 0, 9, "abcde", 0, 0, 9);
+    test("abcdefghij", 0, 9, "abcde", 0, 1, 8);
+    test("abcdefghij", 0, 9, "abcde", 0, 2, 7);
+    test("abcdefghij", 0, 9, "abcde", 0, 4, 5);
+    test("abcdefghij", 0, 9, "abcde", 0, 5, 4);
+    test("abcdefghij", 0, 9, "abcde", 0, 6, 4);
+    test("abcdefghij", 0, 9, "abcde", 1, 0, 9);
+    test("abcdefghij", 0, 9, "abcde", 1, 1, -1);
+    test("abcdefghij", 0, 9, "abcde", 1, 2, -1);
+    test("abcdefghij", 0, 9, "abcde", 1, 3, -1);
+    test("abcdefghij", 0, 9, "abcde", 1, 4, -1);
+    test("abcdefghij", 0, 9, "abcde", 1, 5, -1);
+    test("abcdefghij", 0, 9, "abcde", 2, 0, 9);
+    test("abcdefghij", 0, 9, "abcde", 2, 1, -2);
+    test("abcdefghij", 0, 9, "abcde", 2, 2, -2);
+    test("abcdefghij", 0, 9, "abcde", 2, 3, -2);
+    test("abcdefghij", 0, 9, "abcde", 2, 4, -2);
+    test("abcdefghij", 0, 9, "abcde", 4, 0, 9);
+    test("abcdefghij", 0, 9, "abcde", 4, 1, -4);
+    test("abcdefghij", 0, 9, "abcde", 4, 2, -4);
+    test("abcdefghij", 0, 9, "abcde", 5, 0, 9);
+    test("abcdefghij", 0, 9, "abcde", 5, 1, 9);
+    test("abcdefghij", 0, 9, "abcde", 6, 0, 0);
+    test("abcdefghij", 0, 9, "abcdefghij", 0, 0, 9);
+    test("abcdefghij", 0, 9, "abcdefghij", 0, 1, 8);
+    test("abcdefghij", 0, 9, "abcdefghij", 0, 5, 4);
+    test("abcdefghij", 0, 9, "abcdefghij", 0, 9, 0);
+    test("abcdefghij", 0, 9, "abcdefghij", 0, 10, -1);
+    test("abcdefghij", 0, 9, "abcdefghij", 0, 11, -1);
+    test("abcdefghij", 0, 9, "abcdefghij", 1, 0, 9);
+    test("abcdefghij", 0, 9, "abcdefghij", 1, 1, -1);
+    test("abcdefghij", 0, 9, "abcdefghij", 1, 4, -1);
+    test("abcdefghij", 0, 9, "abcdefghij", 1, 8, -1);
+    test("abcdefghij", 0, 9, "abcdefghij", 1, 9, -1);
+    test("abcdefghij", 0, 9, "abcdefghij", 1, 10, -1);
+    test("abcdefghij", 0, 9, "abcdefghij", 5, 0, 9);
+    test("abcdefghij", 0, 9, "abcdefghij", 5, 1, -5);
+    test("abcdefghij", 0, 9, "abcdefghij", 5, 2, -5);
+    test("abcdefghij", 0, 9, "abcdefghij", 5, 4, -5);
+    test("abcdefghij", 0, 9, "abcdefghij", 5, 5, -5);
+    test("abcdefghij", 0, 9, "abcdefghij", 5, 6, -5);
+    test("abcdefghij", 0, 9, "abcdefghij", 9, 0, 9);
+    test("abcdefghij", 0, 9, "abcdefghij", 9, 1, -9);
+    test("abcdefghij", 0, 9, "abcdefghij", 9, 2, -9);
+    test("abcdefghij", 0, 9, "abcdefghij", 10, 0, 9);
+    test("abcdefghij", 0, 9, "abcdefghij", 10, 1, 9);
+    test("abcdefghij", 0, 9, "abcdefghij", 11, 0, 0);
+    test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", 0, 0, 9);
+    test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", 0, 1, 8);
+    test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", 0, 10, -1);
+    test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", 0, 19, -10);
+}
+
+void test22()
+{
+    test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", 0, 20, -11);
+    test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", 0, 21, -11);
+    test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", 1, 0, 9);
+    test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", 1, 9, -1);
+    test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", 1, 18, -1);
+    test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", 1, 19, -1);
+    test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", 1, 20, -1);
+    test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", 10, 0, 9);
+    test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", 10, 1, -10);
+    test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", 10, 5, -10);
+    test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", 10, 9, -10);
+    test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", 10, 11, -10);
+    test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", 19, 0, 9);
+    test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", 19, 1, -19);
+    test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", 19, 2, -19);
+    test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", 20, 0, 9);
+    test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", 20, 1, 9);
+    test("abcdefghij", 0, 9, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghij", 0, 10, "", 0, 0, 10);
+    test("abcdefghij", 0, 10, "", 0, 1, 10);
+    test("abcdefghij", 0, 10, "", 1, 0, 0);
+    test("abcdefghij", 0, 10, "abcde", 0, 0, 10);
+    test("abcdefghij", 0, 10, "abcde", 0, 1, 9);
+    test("abcdefghij", 0, 10, "abcde", 0, 2, 8);
+    test("abcdefghij", 0, 10, "abcde", 0, 4, 6);
+    test("abcdefghij", 0, 10, "abcde", 0, 5, 5);
+    test("abcdefghij", 0, 10, "abcde", 0, 6, 5);
+    test("abcdefghij", 0, 10, "abcde", 1, 0, 10);
+    test("abcdefghij", 0, 10, "abcde", 1, 1, -1);
+    test("abcdefghij", 0, 10, "abcde", 1, 2, -1);
+    test("abcdefghij", 0, 10, "abcde", 1, 3, -1);
+    test("abcdefghij", 0, 10, "abcde", 1, 4, -1);
+    test("abcdefghij", 0, 10, "abcde", 1, 5, -1);
+    test("abcdefghij", 0, 10, "abcde", 2, 0, 10);
+    test("abcdefghij", 0, 10, "abcde", 2, 1, -2);
+    test("abcdefghij", 0, 10, "abcde", 2, 2, -2);
+    test("abcdefghij", 0, 10, "abcde", 2, 3, -2);
+    test("abcdefghij", 0, 10, "abcde", 2, 4, -2);
+    test("abcdefghij", 0, 10, "abcde", 4, 0, 10);
+    test("abcdefghij", 0, 10, "abcde", 4, 1, -4);
+    test("abcdefghij", 0, 10, "abcde", 4, 2, -4);
+    test("abcdefghij", 0, 10, "abcde", 5, 0, 10);
+    test("abcdefghij", 0, 10, "abcde", 5, 1, 10);
+    test("abcdefghij", 0, 10, "abcde", 6, 0, 0);
+    test("abcdefghij", 0, 10, "abcdefghij", 0, 0, 10);
+    test("abcdefghij", 0, 10, "abcdefghij", 0, 1, 9);
+    test("abcdefghij", 0, 10, "abcdefghij", 0, 5, 5);
+    test("abcdefghij", 0, 10, "abcdefghij", 0, 9, 1);
+    test("abcdefghij", 0, 10, "abcdefghij", 0, 10, 0);
+    test("abcdefghij", 0, 10, "abcdefghij", 0, 11, 0);
+    test("abcdefghij", 0, 10, "abcdefghij", 1, 0, 10);
+    test("abcdefghij", 0, 10, "abcdefghij", 1, 1, -1);
+    test("abcdefghij", 0, 10, "abcdefghij", 1, 4, -1);
+    test("abcdefghij", 0, 10, "abcdefghij", 1, 8, -1);
+    test("abcdefghij", 0, 10, "abcdefghij", 1, 9, -1);
+    test("abcdefghij", 0, 10, "abcdefghij", 1, 10, -1);
+    test("abcdefghij", 0, 10, "abcdefghij", 5, 0, 10);
+    test("abcdefghij", 0, 10, "abcdefghij", 5, 1, -5);
+    test("abcdefghij", 0, 10, "abcdefghij", 5, 2, -5);
+    test("abcdefghij", 0, 10, "abcdefghij", 5, 4, -5);
+    test("abcdefghij", 0, 10, "abcdefghij", 5, 5, -5);
+    test("abcdefghij", 0, 10, "abcdefghij", 5, 6, -5);
+    test("abcdefghij", 0, 10, "abcdefghij", 9, 0, 10);
+    test("abcdefghij", 0, 10, "abcdefghij", 9, 1, -9);
+    test("abcdefghij", 0, 10, "abcdefghij", 9, 2, -9);
+    test("abcdefghij", 0, 10, "abcdefghij", 10, 0, 10);
+    test("abcdefghij", 0, 10, "abcdefghij", 10, 1, 10);
+    test("abcdefghij", 0, 10, "abcdefghij", 11, 0, 0);
+    test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", 0, 0, 10);
+    test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", 0, 1, 9);
+    test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", 0, 10, 0);
+    test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", 0, 19, -9);
+    test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", 0, 20, -10);
+    test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", 0, 21, -10);
+    test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", 1, 0, 10);
+    test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", 1, 9, -1);
+    test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", 1, 18, -1);
+    test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", 1, 19, -1);
+    test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", 1, 20, -1);
+    test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", 10, 0, 10);
+    test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", 10, 1, -10);
+    test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", 10, 5, -10);
+    test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", 10, 9, -10);
+    test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", 10, 11, -10);
+    test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", 19, 0, 10);
+    test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", 19, 1, -19);
+    test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", 19, 2, -19);
+    test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", 20, 0, 10);
+    test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", 20, 1, 10);
+    test("abcdefghij", 0, 10, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghij", 0, 11, "", 0, 0, 10);
+    test("abcdefghij", 0, 11, "", 0, 1, 10);
+    test("abcdefghij", 0, 11, "", 1, 0, 0);
+    test("abcdefghij", 0, 11, "abcde", 0, 0, 10);
+    test("abcdefghij", 0, 11, "abcde", 0, 1, 9);
+    test("abcdefghij", 0, 11, "abcde", 0, 2, 8);
+}
+
+void test23()
+{
+    test("abcdefghij", 0, 11, "abcde", 0, 4, 6);
+    test("abcdefghij", 0, 11, "abcde", 0, 5, 5);
+    test("abcdefghij", 0, 11, "abcde", 0, 6, 5);
+    test("abcdefghij", 0, 11, "abcde", 1, 0, 10);
+    test("abcdefghij", 0, 11, "abcde", 1, 1, -1);
+    test("abcdefghij", 0, 11, "abcde", 1, 2, -1);
+    test("abcdefghij", 0, 11, "abcde", 1, 3, -1);
+    test("abcdefghij", 0, 11, "abcde", 1, 4, -1);
+    test("abcdefghij", 0, 11, "abcde", 1, 5, -1);
+    test("abcdefghij", 0, 11, "abcde", 2, 0, 10);
+    test("abcdefghij", 0, 11, "abcde", 2, 1, -2);
+    test("abcdefghij", 0, 11, "abcde", 2, 2, -2);
+    test("abcdefghij", 0, 11, "abcde", 2, 3, -2);
+    test("abcdefghij", 0, 11, "abcde", 2, 4, -2);
+    test("abcdefghij", 0, 11, "abcde", 4, 0, 10);
+    test("abcdefghij", 0, 11, "abcde", 4, 1, -4);
+    test("abcdefghij", 0, 11, "abcde", 4, 2, -4);
+    test("abcdefghij", 0, 11, "abcde", 5, 0, 10);
+    test("abcdefghij", 0, 11, "abcde", 5, 1, 10);
+    test("abcdefghij", 0, 11, "abcde", 6, 0, 0);
+    test("abcdefghij", 0, 11, "abcdefghij", 0, 0, 10);
+    test("abcdefghij", 0, 11, "abcdefghij", 0, 1, 9);
+    test("abcdefghij", 0, 11, "abcdefghij", 0, 5, 5);
+    test("abcdefghij", 0, 11, "abcdefghij", 0, 9, 1);
+    test("abcdefghij", 0, 11, "abcdefghij", 0, 10, 0);
+    test("abcdefghij", 0, 11, "abcdefghij", 0, 11, 0);
+    test("abcdefghij", 0, 11, "abcdefghij", 1, 0, 10);
+    test("abcdefghij", 0, 11, "abcdefghij", 1, 1, -1);
+    test("abcdefghij", 0, 11, "abcdefghij", 1, 4, -1);
+    test("abcdefghij", 0, 11, "abcdefghij", 1, 8, -1);
+    test("abcdefghij", 0, 11, "abcdefghij", 1, 9, -1);
+    test("abcdefghij", 0, 11, "abcdefghij", 1, 10, -1);
+    test("abcdefghij", 0, 11, "abcdefghij", 5, 0, 10);
+    test("abcdefghij", 0, 11, "abcdefghij", 5, 1, -5);
+    test("abcdefghij", 0, 11, "abcdefghij", 5, 2, -5);
+    test("abcdefghij", 0, 11, "abcdefghij", 5, 4, -5);
+    test("abcdefghij", 0, 11, "abcdefghij", 5, 5, -5);
+    test("abcdefghij", 0, 11, "abcdefghij", 5, 6, -5);
+    test("abcdefghij", 0, 11, "abcdefghij", 9, 0, 10);
+    test("abcdefghij", 0, 11, "abcdefghij", 9, 1, -9);
+    test("abcdefghij", 0, 11, "abcdefghij", 9, 2, -9);
+    test("abcdefghij", 0, 11, "abcdefghij", 10, 0, 10);
+    test("abcdefghij", 0, 11, "abcdefghij", 10, 1, 10);
+    test("abcdefghij", 0, 11, "abcdefghij", 11, 0, 0);
+    test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", 0, 0, 10);
+    test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", 0, 1, 9);
+    test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", 0, 10, 0);
+    test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", 0, 19, -9);
+    test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", 0, 20, -10);
+    test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", 0, 21, -10);
+    test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", 1, 0, 10);
+    test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", 1, 9, -1);
+    test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", 1, 18, -1);
+    test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", 1, 19, -1);
+    test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", 1, 20, -1);
+    test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", 10, 0, 10);
+    test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", 10, 1, -10);
+    test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", 10, 5, -10);
+    test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", 10, 9, -10);
+    test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", 10, 11, -10);
+    test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", 19, 0, 10);
+    test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", 19, 1, -19);
+    test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", 19, 2, -19);
+    test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", 20, 0, 10);
+    test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", 20, 1, 10);
+    test("abcdefghij", 0, 11, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghij", 1, 0, "", 0, 0, 0);
+    test("abcdefghij", 1, 0, "", 0, 1, 0);
+    test("abcdefghij", 1, 0, "", 1, 0, 0);
+    test("abcdefghij", 1, 0, "abcde", 0, 0, 0);
+    test("abcdefghij", 1, 0, "abcde", 0, 1, -1);
+    test("abcdefghij", 1, 0, "abcde", 0, 2, -2);
+    test("abcdefghij", 1, 0, "abcde", 0, 4, -4);
+    test("abcdefghij", 1, 0, "abcde", 0, 5, -5);
+    test("abcdefghij", 1, 0, "abcde", 0, 6, -5);
+    test("abcdefghij", 1, 0, "abcde", 1, 0, 0);
+    test("abcdefghij", 1, 0, "abcde", 1, 1, -1);
+    test("abcdefghij", 1, 0, "abcde", 1, 2, -2);
+    test("abcdefghij", 1, 0, "abcde", 1, 3, -3);
+    test("abcdefghij", 1, 0, "abcde", 1, 4, -4);
+    test("abcdefghij", 1, 0, "abcde", 1, 5, -4);
+    test("abcdefghij", 1, 0, "abcde", 2, 0, 0);
+    test("abcdefghij", 1, 0, "abcde", 2, 1, -1);
+    test("abcdefghij", 1, 0, "abcde", 2, 2, -2);
+    test("abcdefghij", 1, 0, "abcde", 2, 3, -3);
+    test("abcdefghij", 1, 0, "abcde", 2, 4, -3);
+    test("abcdefghij", 1, 0, "abcde", 4, 0, 0);
+    test("abcdefghij", 1, 0, "abcde", 4, 1, -1);
+    test("abcdefghij", 1, 0, "abcde", 4, 2, -1);
+    test("abcdefghij", 1, 0, "abcde", 5, 0, 0);
+    test("abcdefghij", 1, 0, "abcde", 5, 1, 0);
+    test("abcdefghij", 1, 0, "abcde", 6, 0, 0);
+    test("abcdefghij", 1, 0, "abcdefghij", 0, 0, 0);
+    test("abcdefghij", 1, 0, "abcdefghij", 0, 1, -1);
+    test("abcdefghij", 1, 0, "abcdefghij", 0, 5, -5);
+    test("abcdefghij", 1, 0, "abcdefghij", 0, 9, -9);
+    test("abcdefghij", 1, 0, "abcdefghij", 0, 10, -10);
+    test("abcdefghij", 1, 0, "abcdefghij", 0, 11, -10);
+}
+
+void test24()
+{
+    test("abcdefghij", 1, 0, "abcdefghij", 1, 0, 0);
+    test("abcdefghij", 1, 0, "abcdefghij", 1, 1, -1);
+    test("abcdefghij", 1, 0, "abcdefghij", 1, 4, -4);
+    test("abcdefghij", 1, 0, "abcdefghij", 1, 8, -8);
+    test("abcdefghij", 1, 0, "abcdefghij", 1, 9, -9);
+    test("abcdefghij", 1, 0, "abcdefghij", 1, 10, -9);
+    test("abcdefghij", 1, 0, "abcdefghij", 5, 0, 0);
+    test("abcdefghij", 1, 0, "abcdefghij", 5, 1, -1);
+    test("abcdefghij", 1, 0, "abcdefghij", 5, 2, -2);
+    test("abcdefghij", 1, 0, "abcdefghij", 5, 4, -4);
+    test("abcdefghij", 1, 0, "abcdefghij", 5, 5, -5);
+    test("abcdefghij", 1, 0, "abcdefghij", 5, 6, -5);
+    test("abcdefghij", 1, 0, "abcdefghij", 9, 0, 0);
+    test("abcdefghij", 1, 0, "abcdefghij", 9, 1, -1);
+    test("abcdefghij", 1, 0, "abcdefghij", 9, 2, -1);
+    test("abcdefghij", 1, 0, "abcdefghij", 10, 0, 0);
+    test("abcdefghij", 1, 0, "abcdefghij", 10, 1, 0);
+    test("abcdefghij", 1, 0, "abcdefghij", 11, 0, 0);
+    test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", 0, 0, 0);
+    test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", 0, 1, -1);
+    test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", 0, 10, -10);
+    test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", 0, 19, -19);
+    test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", 0, 20, -20);
+    test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", 0, 21, -20);
+    test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", 1, 0, 0);
+    test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", 1, 9, -9);
+    test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", 1, 18, -18);
+    test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", 1, 19, -19);
+    test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", 1, 20, -19);
+    test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", 10, 0, 0);
+    test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", 10, 1, -1);
+    test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", 10, 5, -5);
+    test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", 10, 11, -10);
+    test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", 19, 0, 0);
+    test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", 19, 1, -1);
+    test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", 19, 2, -1);
+    test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", 20, 0, 0);
+    test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", 20, 1, 0);
+    test("abcdefghij", 1, 0, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghij", 1, 1, "", 0, 0, 1);
+    test("abcdefghij", 1, 1, "", 0, 1, 1);
+    test("abcdefghij", 1, 1, "", 1, 0, 0);
+    test("abcdefghij", 1, 1, "abcde", 0, 0, 1);
+    test("abcdefghij", 1, 1, "abcde", 0, 1, 1);
+    test("abcdefghij", 1, 1, "abcde", 0, 2, 1);
+    test("abcdefghij", 1, 1, "abcde", 0, 4, 1);
+    test("abcdefghij", 1, 1, "abcde", 0, 5, 1);
+    test("abcdefghij", 1, 1, "abcde", 0, 6, 1);
+    test("abcdefghij", 1, 1, "abcde", 1, 0, 1);
+    test("abcdefghij", 1, 1, "abcde", 1, 1, 0);
+    test("abcdefghij", 1, 1, "abcde", 1, 2, -1);
+    test("abcdefghij", 1, 1, "abcde", 1, 3, -2);
+    test("abcdefghij", 1, 1, "abcde", 1, 4, -3);
+    test("abcdefghij", 1, 1, "abcde", 1, 5, -3);
+    test("abcdefghij", 1, 1, "abcde", 2, 0, 1);
+    test("abcdefghij", 1, 1, "abcde", 2, 1, -1);
+    test("abcdefghij", 1, 1, "abcde", 2, 2, -1);
+    test("abcdefghij", 1, 1, "abcde", 2, 3, -1);
+    test("abcdefghij", 1, 1, "abcde", 2, 4, -1);
+    test("abcdefghij", 1, 1, "abcde", 4, 0, 1);
+    test("abcdefghij", 1, 1, "abcde", 4, 1, -3);
+    test("abcdefghij", 1, 1, "abcde", 4, 2, -3);
+    test("abcdefghij", 1, 1, "abcde", 5, 0, 1);
+    test("abcdefghij", 1, 1, "abcde", 5, 1, 1);
+    test("abcdefghij", 1, 1, "abcde", 6, 0, 0);
+    test("abcdefghij", 1, 1, "abcdefghij", 0, 0, 1);
+    test("abcdefghij", 1, 1, "abcdefghij", 0, 1, 1);
+    test("abcdefghij", 1, 1, "abcdefghij", 0, 5, 1);
+    test("abcdefghij", 1, 1, "abcdefghij", 0, 9, 1);
+    test("abcdefghij", 1, 1, "abcdefghij", 0, 10, 1);
+    test("abcdefghij", 1, 1, "abcdefghij", 0, 11, 1);
+    test("abcdefghij", 1, 1, "abcdefghij", 1, 0, 1);
+    test("abcdefghij", 1, 1, "abcdefghij", 1, 1, 0);
+    test("abcdefghij", 1, 1, "abcdefghij", 1, 4, -3);
+    test("abcdefghij", 1, 1, "abcdefghij", 1, 8, -7);
+    test("abcdefghij", 1, 1, "abcdefghij", 1, 9, -8);
+    test("abcdefghij", 1, 1, "abcdefghij", 1, 10, -8);
+    test("abcdefghij", 1, 1, "abcdefghij", 5, 0, 1);
+    test("abcdefghij", 1, 1, "abcdefghij", 5, 1, -4);
+    test("abcdefghij", 1, 1, "abcdefghij", 5, 2, -4);
+    test("abcdefghij", 1, 1, "abcdefghij", 5, 4, -4);
+    test("abcdefghij", 1, 1, "abcdefghij", 5, 5, -4);
+    test("abcdefghij", 1, 1, "abcdefghij", 5, 6, -4);
+    test("abcdefghij", 1, 1, "abcdefghij", 9, 0, 1);
+    test("abcdefghij", 1, 1, "abcdefghij", 9, 1, -8);
+    test("abcdefghij", 1, 1, "abcdefghij", 9, 2, -8);
+    test("abcdefghij", 1, 1, "abcdefghij", 10, 0, 1);
+    test("abcdefghij", 1, 1, "abcdefghij", 10, 1, 1);
+    test("abcdefghij", 1, 1, "abcdefghij", 11, 0, 0);
+    test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 0, 0, 1);
+    test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 0, 1, 1);
+    test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 0, 10, 1);
+    test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 0, 19, 1);
+    test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 0, 20, 1);
+    test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 0, 21, 1);
+    test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 1, 0, 1);
+    test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 1, 1, 0);
+}
+
+void test25()
+{
+    test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 1, 9, -8);
+    test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 1, 18, -17);
+    test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 1, 19, -18);
+    test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 1, 20, -18);
+    test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 10, 0, 1);
+    test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 10, 1, -9);
+    test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 10, 5, -9);
+    test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 10, 10, -9);
+    test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 10, 11, -9);
+    test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 19, 0, 1);
+    test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 19, 1, -18);
+    test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 19, 2, -18);
+    test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 20, 0, 1);
+    test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 20, 1, 1);
+    test("abcdefghij", 1, 1, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghij", 1, 4, "", 0, 0, 4);
+    test("abcdefghij", 1, 4, "", 0, 1, 4);
+    test("abcdefghij", 1, 4, "", 1, 0, 0);
+    test("abcdefghij", 1, 4, "abcde", 0, 0, 4);
+    test("abcdefghij", 1, 4, "abcde", 0, 1, 1);
+    test("abcdefghij", 1, 4, "abcde", 0, 2, 1);
+    test("abcdefghij", 1, 4, "abcde", 0, 4, 1);
+    test("abcdefghij", 1, 4, "abcde", 0, 5, 1);
+    test("abcdefghij", 1, 4, "abcde", 0, 6, 1);
+    test("abcdefghij", 1, 4, "abcde", 1, 0, 4);
+    test("abcdefghij", 1, 4, "abcde", 1, 1, 3);
+    test("abcdefghij", 1, 4, "abcde", 1, 2, 2);
+    test("abcdefghij", 1, 4, "abcde", 1, 3, 1);
+    test("abcdefghij", 1, 4, "abcde", 1, 4, 0);
+    test("abcdefghij", 1, 4, "abcde", 1, 5, 0);
+    test("abcdefghij", 1, 4, "abcde", 2, 0, 4);
+    test("abcdefghij", 1, 4, "abcde", 2, 1, -1);
+    test("abcdefghij", 1, 4, "abcde", 2, 2, -1);
+    test("abcdefghij", 1, 4, "abcde", 2, 3, -1);
+    test("abcdefghij", 1, 4, "abcde", 2, 4, -1);
+    test("abcdefghij", 1, 4, "abcde", 4, 0, 4);
+    test("abcdefghij", 1, 4, "abcde", 4, 1, -3);
+    test("abcdefghij", 1, 4, "abcde", 4, 2, -3);
+    test("abcdefghij", 1, 4, "abcde", 5, 0, 4);
+    test("abcdefghij", 1, 4, "abcde", 5, 1, 4);
+    test("abcdefghij", 1, 4, "abcde", 6, 0, 0);
+    test("abcdefghij", 1, 4, "abcdefghij", 0, 0, 4);
+    test("abcdefghij", 1, 4, "abcdefghij", 0, 1, 1);
+    test("abcdefghij", 1, 4, "abcdefghij", 0, 5, 1);
+    test("abcdefghij", 1, 4, "abcdefghij", 0, 9, 1);
+    test("abcdefghij", 1, 4, "abcdefghij", 0, 10, 1);
+    test("abcdefghij", 1, 4, "abcdefghij", 0, 11, 1);
+    test("abcdefghij", 1, 4, "abcdefghij", 1, 0, 4);
+    test("abcdefghij", 1, 4, "abcdefghij", 1, 1, 3);
+    test("abcdefghij", 1, 4, "abcdefghij", 1, 4, 0);
+    test("abcdefghij", 1, 4, "abcdefghij", 1, 8, -4);
+    test("abcdefghij", 1, 4, "abcdefghij", 1, 9, -5);
+    test("abcdefghij", 1, 4, "abcdefghij", 1, 10, -5);
+    test("abcdefghij", 1, 4, "abcdefghij", 5, 0, 4);
+    test("abcdefghij", 1, 4, "abcdefghij", 5, 1, -4);
+    test("abcdefghij", 1, 4, "abcdefghij", 5, 2, -4);
+    test("abcdefghij", 1, 4, "abcdefghij", 5, 4, -4);
+    test("abcdefghij", 1, 4, "abcdefghij", 5, 5, -4);
+    test("abcdefghij", 1, 4, "abcdefghij", 5, 6, -4);
+    test("abcdefghij", 1, 4, "abcdefghij", 9, 0, 4);
+    test("abcdefghij", 1, 4, "abcdefghij", 9, 1, -8);
+    test("abcdefghij", 1, 4, "abcdefghij", 9, 2, -8);
+    test("abcdefghij", 1, 4, "abcdefghij", 10, 0, 4);
+    test("abcdefghij", 1, 4, "abcdefghij", 10, 1, 4);
+    test("abcdefghij", 1, 4, "abcdefghij", 11, 0, 0);
+    test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 0, 0, 4);
+    test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 0, 1, 1);
+    test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 0, 10, 1);
+    test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 0, 19, 1);
+    test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 0, 20, 1);
+    test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 0, 21, 1);
+    test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 1, 0, 4);
+    test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 1, 1, 3);
+    test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 1, 9, -5);
+    test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 1, 18, -14);
+    test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 1, 19, -15);
+    test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 1, 20, -15);
+    test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 10, 0, 4);
+    test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 10, 1, -9);
+    test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 10, 5, -9);
+    test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 10, 10, -9);
+    test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 10, 11, -9);
+    test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 19, 0, 4);
+    test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 19, 1, -18);
+    test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 19, 2, -18);
+    test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 20, 0, 4);
+    test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 20, 1, 4);
+    test("abcdefghij", 1, 4, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghij", 1, 8, "", 0, 0, 8);
+    test("abcdefghij", 1, 8, "", 0, 1, 8);
+    test("abcdefghij", 1, 8, "", 1, 0, 0);
+    test("abcdefghij", 1, 8, "abcde", 0, 0, 8);
+    test("abcdefghij", 1, 8, "abcde", 0, 1, 1);
+    test("abcdefghij", 1, 8, "abcde", 0, 2, 1);
+    test("abcdefghij", 1, 8, "abcde", 0, 4, 1);
+    test("abcdefghij", 1, 8, "abcde", 0, 5, 1);
+    test("abcdefghij", 1, 8, "abcde", 0, 6, 1);
+    test("abcdefghij", 1, 8, "abcde", 1, 0, 8);
+}
+
+void test26()
+{
+    test("abcdefghij", 1, 8, "abcde", 1, 1, 7);
+    test("abcdefghij", 1, 8, "abcde", 1, 2, 6);
+    test("abcdefghij", 1, 8, "abcde", 1, 3, 5);
+    test("abcdefghij", 1, 8, "abcde", 1, 4, 4);
+    test("abcdefghij", 1, 8, "abcde", 1, 5, 4);
+    test("abcdefghij", 1, 8, "abcde", 2, 0, 8);
+    test("abcdefghij", 1, 8, "abcde", 2, 1, -1);
+    test("abcdefghij", 1, 8, "abcde", 2, 2, -1);
+    test("abcdefghij", 1, 8, "abcde", 2, 3, -1);
+    test("abcdefghij", 1, 8, "abcde", 2, 4, -1);
+    test("abcdefghij", 1, 8, "abcde", 4, 0, 8);
+    test("abcdefghij", 1, 8, "abcde", 4, 1, -3);
+    test("abcdefghij", 1, 8, "abcde", 4, 2, -3);
+    test("abcdefghij", 1, 8, "abcde", 5, 0, 8);
+    test("abcdefghij", 1, 8, "abcde", 5, 1, 8);
+    test("abcdefghij", 1, 8, "abcde", 6, 0, 0);
+    test("abcdefghij", 1, 8, "abcdefghij", 0, 0, 8);
+    test("abcdefghij", 1, 8, "abcdefghij", 0, 1, 1);
+    test("abcdefghij", 1, 8, "abcdefghij", 0, 5, 1);
+    test("abcdefghij", 1, 8, "abcdefghij", 0, 9, 1);
+    test("abcdefghij", 1, 8, "abcdefghij", 0, 10, 1);
+    test("abcdefghij", 1, 8, "abcdefghij", 0, 11, 1);
+    test("abcdefghij", 1, 8, "abcdefghij", 1, 0, 8);
+    test("abcdefghij", 1, 8, "abcdefghij", 1, 1, 7);
+    test("abcdefghij", 1, 8, "abcdefghij", 1, 4, 4);
+    test("abcdefghij", 1, 8, "abcdefghij", 1, 8, 0);
+    test("abcdefghij", 1, 8, "abcdefghij", 1, 9, -1);
+    test("abcdefghij", 1, 8, "abcdefghij", 1, 10, -1);
+    test("abcdefghij", 1, 8, "abcdefghij", 5, 0, 8);
+    test("abcdefghij", 1, 8, "abcdefghij", 5, 1, -4);
+    test("abcdefghij", 1, 8, "abcdefghij", 5, 2, -4);
+    test("abcdefghij", 1, 8, "abcdefghij", 5, 4, -4);
+    test("abcdefghij", 1, 8, "abcdefghij", 5, 5, -4);
+    test("abcdefghij", 1, 8, "abcdefghij", 5, 6, -4);
+    test("abcdefghij", 1, 8, "abcdefghij", 9, 0, 8);
+    test("abcdefghij", 1, 8, "abcdefghij", 9, 1, -8);
+    test("abcdefghij", 1, 8, "abcdefghij", 9, 2, -8);
+    test("abcdefghij", 1, 8, "abcdefghij", 10, 0, 8);
+    test("abcdefghij", 1, 8, "abcdefghij", 10, 1, 8);
+    test("abcdefghij", 1, 8, "abcdefghij", 11, 0, 0);
+    test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 0, 0, 8);
+    test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 0, 1, 1);
+    test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 0, 10, 1);
+    test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 0, 19, 1);
+    test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 0, 20, 1);
+    test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 0, 21, 1);
+    test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 1, 0, 8);
+    test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 1, 1, 7);
+    test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 1, 9, -1);
+    test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 1, 18, -10);
+    test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 1, 19, -11);
+    test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 1, 20, -11);
+    test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 10, 0, 8);
+    test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 10, 1, -9);
+    test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 10, 5, -9);
+    test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 10, 10, -9);
+    test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 10, 11, -9);
+    test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 19, 0, 8);
+    test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 19, 1, -18);
+    test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 19, 2, -18);
+    test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 20, 0, 8);
+    test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 20, 1, 8);
+    test("abcdefghij", 1, 8, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghij", 1, 9, "", 0, 0, 9);
+    test("abcdefghij", 1, 9, "", 0, 1, 9);
+    test("abcdefghij", 1, 9, "", 1, 0, 0);
+    test("abcdefghij", 1, 9, "abcde", 0, 0, 9);
+    test("abcdefghij", 1, 9, "abcde", 0, 1, 1);
+    test("abcdefghij", 1, 9, "abcde", 0, 2, 1);
+    test("abcdefghij", 1, 9, "abcde", 0, 4, 1);
+    test("abcdefghij", 1, 9, "abcde", 0, 5, 1);
+    test("abcdefghij", 1, 9, "abcde", 0, 6, 1);
+    test("abcdefghij", 1, 9, "abcde", 1, 0, 9);
+    test("abcdefghij", 1, 9, "abcde", 1, 1, 8);
+    test("abcdefghij", 1, 9, "abcde", 1, 2, 7);
+    test("abcdefghij", 1, 9, "abcde", 1, 3, 6);
+    test("abcdefghij", 1, 9, "abcde", 1, 4, 5);
+    test("abcdefghij", 1, 9, "abcde", 1, 5, 5);
+    test("abcdefghij", 1, 9, "abcde", 2, 0, 9);
+    test("abcdefghij", 1, 9, "abcde", 2, 1, -1);
+    test("abcdefghij", 1, 9, "abcde", 2, 2, -1);
+    test("abcdefghij", 1, 9, "abcde", 2, 3, -1);
+    test("abcdefghij", 1, 9, "abcde", 2, 4, -1);
+    test("abcdefghij", 1, 9, "abcde", 4, 0, 9);
+    test("abcdefghij", 1, 9, "abcde", 4, 1, -3);
+    test("abcdefghij", 1, 9, "abcde", 4, 2, -3);
+    test("abcdefghij", 1, 9, "abcde", 5, 0, 9);
+    test("abcdefghij", 1, 9, "abcde", 5, 1, 9);
+    test("abcdefghij", 1, 9, "abcde", 6, 0, 0);
+    test("abcdefghij", 1, 9, "abcdefghij", 0, 0, 9);
+    test("abcdefghij", 1, 9, "abcdefghij", 0, 1, 1);
+    test("abcdefghij", 1, 9, "abcdefghij", 0, 5, 1);
+    test("abcdefghij", 1, 9, "abcdefghij", 0, 9, 1);
+    test("abcdefghij", 1, 9, "abcdefghij", 0, 10, 1);
+    test("abcdefghij", 1, 9, "abcdefghij", 0, 11, 1);
+    test("abcdefghij", 1, 9, "abcdefghij", 1, 0, 9);
+    test("abcdefghij", 1, 9, "abcdefghij", 1, 1, 8);
+    test("abcdefghij", 1, 9, "abcdefghij", 1, 4, 5);
+    test("abcdefghij", 1, 9, "abcdefghij", 1, 8, 1);
+}
+
+void test27()
+{
+    test("abcdefghij", 1, 9, "abcdefghij", 1, 9, 0);
+    test("abcdefghij", 1, 9, "abcdefghij", 1, 10, 0);
+    test("abcdefghij", 1, 9, "abcdefghij", 5, 0, 9);
+    test("abcdefghij", 1, 9, "abcdefghij", 5, 1, -4);
+    test("abcdefghij", 1, 9, "abcdefghij", 5, 2, -4);
+    test("abcdefghij", 1, 9, "abcdefghij", 5, 4, -4);
+    test("abcdefghij", 1, 9, "abcdefghij", 5, 5, -4);
+    test("abcdefghij", 1, 9, "abcdefghij", 5, 6, -4);
+    test("abcdefghij", 1, 9, "abcdefghij", 9, 0, 9);
+    test("abcdefghij", 1, 9, "abcdefghij", 9, 1, -8);
+    test("abcdefghij", 1, 9, "abcdefghij", 9, 2, -8);
+    test("abcdefghij", 1, 9, "abcdefghij", 10, 0, 9);
+    test("abcdefghij", 1, 9, "abcdefghij", 10, 1, 9);
+    test("abcdefghij", 1, 9, "abcdefghij", 11, 0, 0);
+    test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 0, 0, 9);
+    test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 0, 1, 1);
+    test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 0, 10, 1);
+    test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 0, 19, 1);
+    test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 0, 20, 1);
+    test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 0, 21, 1);
+    test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 1, 0, 9);
+    test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 1, 1, 8);
+    test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 1, 9, 0);
+    test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 1, 18, -9);
+    test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 1, 19, -10);
+    test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 1, 20, -10);
+    test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 10, 0, 9);
+    test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 10, 1, -9);
+    test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 10, 5, -9);
+    test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 10, 10, -9);
+    test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 10, 11, -9);
+    test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 19, 0, 9);
+    test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 19, 1, -18);
+    test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 19, 2, -18);
+    test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 20, 0, 9);
+    test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 20, 1, 9);
+    test("abcdefghij", 1, 9, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghij", 1, 10, "", 0, 0, 9);
+    test("abcdefghij", 1, 10, "", 0, 1, 9);
+    test("abcdefghij", 1, 10, "", 1, 0, 0);
+    test("abcdefghij", 1, 10, "abcde", 0, 0, 9);
+    test("abcdefghij", 1, 10, "abcde", 0, 1, 1);
+    test("abcdefghij", 1, 10, "abcde", 0, 2, 1);
+    test("abcdefghij", 1, 10, "abcde", 0, 4, 1);
+    test("abcdefghij", 1, 10, "abcde", 0, 5, 1);
+    test("abcdefghij", 1, 10, "abcde", 0, 6, 1);
+    test("abcdefghij", 1, 10, "abcde", 1, 0, 9);
+    test("abcdefghij", 1, 10, "abcde", 1, 1, 8);
+    test("abcdefghij", 1, 10, "abcde", 1, 2, 7);
+    test("abcdefghij", 1, 10, "abcde", 1, 3, 6);
+    test("abcdefghij", 1, 10, "abcde", 1, 4, 5);
+    test("abcdefghij", 1, 10, "abcde", 1, 5, 5);
+    test("abcdefghij", 1, 10, "abcde", 2, 0, 9);
+    test("abcdefghij", 1, 10, "abcde", 2, 1, -1);
+    test("abcdefghij", 1, 10, "abcde", 2, 2, -1);
+    test("abcdefghij", 1, 10, "abcde", 2, 3, -1);
+    test("abcdefghij", 1, 10, "abcde", 2, 4, -1);
+    test("abcdefghij", 1, 10, "abcde", 4, 0, 9);
+    test("abcdefghij", 1, 10, "abcde", 4, 1, -3);
+    test("abcdefghij", 1, 10, "abcde", 4, 2, -3);
+    test("abcdefghij", 1, 10, "abcde", 5, 0, 9);
+    test("abcdefghij", 1, 10, "abcde", 5, 1, 9);
+    test("abcdefghij", 1, 10, "abcde", 6, 0, 0);
+    test("abcdefghij", 1, 10, "abcdefghij", 0, 0, 9);
+    test("abcdefghij", 1, 10, "abcdefghij", 0, 1, 1);
+    test("abcdefghij", 1, 10, "abcdefghij", 0, 5, 1);
+    test("abcdefghij", 1, 10, "abcdefghij", 0, 9, 1);
+    test("abcdefghij", 1, 10, "abcdefghij", 0, 10, 1);
+    test("abcdefghij", 1, 10, "abcdefghij", 0, 11, 1);
+    test("abcdefghij", 1, 10, "abcdefghij", 1, 0, 9);
+    test("abcdefghij", 1, 10, "abcdefghij", 1, 1, 8);
+    test("abcdefghij", 1, 10, "abcdefghij", 1, 4, 5);
+    test("abcdefghij", 1, 10, "abcdefghij", 1, 8, 1);
+    test("abcdefghij", 1, 10, "abcdefghij", 1, 9, 0);
+    test("abcdefghij", 1, 10, "abcdefghij", 1, 10, 0);
+    test("abcdefghij", 1, 10, "abcdefghij", 5, 0, 9);
+    test("abcdefghij", 1, 10, "abcdefghij", 5, 1, -4);
+    test("abcdefghij", 1, 10, "abcdefghij", 5, 2, -4);
+    test("abcdefghij", 1, 10, "abcdefghij", 5, 4, -4);
+    test("abcdefghij", 1, 10, "abcdefghij", 5, 5, -4);
+    test("abcdefghij", 1, 10, "abcdefghij", 5, 6, -4);
+    test("abcdefghij", 1, 10, "abcdefghij", 9, 0, 9);
+    test("abcdefghij", 1, 10, "abcdefghij", 9, 1, -8);
+    test("abcdefghij", 1, 10, "abcdefghij", 9, 2, -8);
+    test("abcdefghij", 1, 10, "abcdefghij", 10, 0, 9);
+    test("abcdefghij", 1, 10, "abcdefghij", 10, 1, 9);
+    test("abcdefghij", 1, 10, "abcdefghij", 11, 0, 0);
+    test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 0, 0, 9);
+    test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 0, 1, 1);
+    test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 0, 10, 1);
+    test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 0, 19, 1);
+    test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 0, 20, 1);
+    test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 0, 21, 1);
+    test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 1, 0, 9);
+    test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 1, 1, 8);
+    test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 1, 9, 0);
+    test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 1, 18, -9);
+    test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 1, 19, -10);
+    test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 1, 20, -10);
+}
+
+void test28()
+{
+    test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 10, 0, 9);
+    test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 10, 1, -9);
+    test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 10, 5, -9);
+    test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 10, 10, -9);
+    test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 10, 11, -9);
+    test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 19, 0, 9);
+    test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 19, 1, -18);
+    test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 19, 2, -18);
+    test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 20, 0, 9);
+    test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 20, 1, 9);
+    test("abcdefghij", 1, 10, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghij", 5, 0, "", 0, 0, 0);
+    test("abcdefghij", 5, 0, "", 0, 1, 0);
+    test("abcdefghij", 5, 0, "", 1, 0, 0);
+    test("abcdefghij", 5, 0, "abcde", 0, 0, 0);
+    test("abcdefghij", 5, 0, "abcde", 0, 1, -1);
+    test("abcdefghij", 5, 0, "abcde", 0, 2, -2);
+    test("abcdefghij", 5, 0, "abcde", 0, 4, -4);
+    test("abcdefghij", 5, 0, "abcde", 0, 5, -5);
+    test("abcdefghij", 5, 0, "abcde", 0, 6, -5);
+    test("abcdefghij", 5, 0, "abcde", 1, 0, 0);
+    test("abcdefghij", 5, 0, "abcde", 1, 1, -1);
+    test("abcdefghij", 5, 0, "abcde", 1, 2, -2);
+    test("abcdefghij", 5, 0, "abcde", 1, 3, -3);
+    test("abcdefghij", 5, 0, "abcde", 1, 4, -4);
+    test("abcdefghij", 5, 0, "abcde", 1, 5, -4);
+    test("abcdefghij", 5, 0, "abcde", 2, 0, 0);
+    test("abcdefghij", 5, 0, "abcde", 2, 1, -1);
+    test("abcdefghij", 5, 0, "abcde", 2, 2, -2);
+    test("abcdefghij", 5, 0, "abcde", 2, 3, -3);
+    test("abcdefghij", 5, 0, "abcde", 2, 4, -3);
+    test("abcdefghij", 5, 0, "abcde", 4, 0, 0);
+    test("abcdefghij", 5, 0, "abcde", 4, 1, -1);
+    test("abcdefghij", 5, 0, "abcde", 4, 2, -1);
+    test("abcdefghij", 5, 0, "abcde", 5, 0, 0);
+    test("abcdefghij", 5, 0, "abcde", 5, 1, 0);
+    test("abcdefghij", 5, 0, "abcde", 6, 0, 0);
+    test("abcdefghij", 5, 0, "abcdefghij", 0, 0, 0);
+    test("abcdefghij", 5, 0, "abcdefghij", 0, 1, -1);
+    test("abcdefghij", 5, 0, "abcdefghij", 0, 5, -5);
+    test("abcdefghij", 5, 0, "abcdefghij", 0, 9, -9);
+    test("abcdefghij", 5, 0, "abcdefghij", 0, 10, -10);
+    test("abcdefghij", 5, 0, "abcdefghij", 0, 11, -10);
+    test("abcdefghij", 5, 0, "abcdefghij", 1, 0, 0);
+    test("abcdefghij", 5, 0, "abcdefghij", 1, 1, -1);
+    test("abcdefghij", 5, 0, "abcdefghij", 1, 4, -4);
+    test("abcdefghij", 5, 0, "abcdefghij", 1, 8, -8);
+    test("abcdefghij", 5, 0, "abcdefghij", 1, 9, -9);
+    test("abcdefghij", 5, 0, "abcdefghij", 1, 10, -9);
+    test("abcdefghij", 5, 0, "abcdefghij", 5, 0, 0);
+    test("abcdefghij", 5, 0, "abcdefghij", 5, 1, -1);
+    test("abcdefghij", 5, 0, "abcdefghij", 5, 2, -2);
+    test("abcdefghij", 5, 0, "abcdefghij", 5, 4, -4);
+    test("abcdefghij", 5, 0, "abcdefghij", 5, 5, -5);
+    test("abcdefghij", 5, 0, "abcdefghij", 5, 6, -5);
+    test("abcdefghij", 5, 0, "abcdefghij", 9, 0, 0);
+    test("abcdefghij", 5, 0, "abcdefghij", 9, 1, -1);
+    test("abcdefghij", 5, 0, "abcdefghij", 9, 2, -1);
+    test("abcdefghij", 5, 0, "abcdefghij", 10, 0, 0);
+    test("abcdefghij", 5, 0, "abcdefghij", 10, 1, 0);
+    test("abcdefghij", 5, 0, "abcdefghij", 11, 0, 0);
+    test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", 0, 0, 0);
+    test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", 0, 1, -1);
+    test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", 0, 10, -10);
+    test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", 0, 19, -19);
+    test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", 0, 20, -20);
+    test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", 0, 21, -20);
+    test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", 1, 0, 0);
+    test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", 1, 9, -9);
+    test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", 1, 18, -18);
+    test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", 1, 19, -19);
+    test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", 1, 20, -19);
+    test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", 10, 0, 0);
+    test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", 10, 1, -1);
+    test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", 10, 5, -5);
+    test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", 10, 11, -10);
+    test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", 19, 0, 0);
+    test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", 19, 1, -1);
+    test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", 19, 2, -1);
+    test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", 20, 0, 0);
+    test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", 20, 1, 0);
+    test("abcdefghij", 5, 0, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghij", 5, 1, "", 0, 0, 1);
+    test("abcdefghij", 5, 1, "", 0, 1, 1);
+    test("abcdefghij", 5, 1, "", 1, 0, 0);
+    test("abcdefghij", 5, 1, "abcde", 0, 0, 1);
+    test("abcdefghij", 5, 1, "abcde", 0, 1, 5);
+    test("abcdefghij", 5, 1, "abcde", 0, 2, 5);
+    test("abcdefghij", 5, 1, "abcde", 0, 4, 5);
+    test("abcdefghij", 5, 1, "abcde", 0, 5, 5);
+    test("abcdefghij", 5, 1, "abcde", 0, 6, 5);
+    test("abcdefghij", 5, 1, "abcde", 1, 0, 1);
+    test("abcdefghij", 5, 1, "abcde", 1, 1, 4);
+    test("abcdefghij", 5, 1, "abcde", 1, 2, 4);
+    test("abcdefghij", 5, 1, "abcde", 1, 3, 4);
+    test("abcdefghij", 5, 1, "abcde", 1, 4, 4);
+}
+
+void test29()
+{
+    test("abcdefghij", 5, 1, "abcde", 1, 5, 4);
+    test("abcdefghij", 5, 1, "abcde", 2, 0, 1);
+    test("abcdefghij", 5, 1, "abcde", 2, 1, 3);
+    test("abcdefghij", 5, 1, "abcde", 2, 2, 3);
+    test("abcdefghij", 5, 1, "abcde", 2, 3, 3);
+    test("abcdefghij", 5, 1, "abcde", 2, 4, 3);
+    test("abcdefghij", 5, 1, "abcde", 4, 0, 1);
+    test("abcdefghij", 5, 1, "abcde", 4, 1, 1);
+    test("abcdefghij", 5, 1, "abcde", 4, 2, 1);
+    test("abcdefghij", 5, 1, "abcde", 5, 0, 1);
+    test("abcdefghij", 5, 1, "abcde", 5, 1, 1);
+    test("abcdefghij", 5, 1, "abcde", 6, 0, 0);
+    test("abcdefghij", 5, 1, "abcdefghij", 0, 0, 1);
+    test("abcdefghij", 5, 1, "abcdefghij", 0, 1, 5);
+    test("abcdefghij", 5, 1, "abcdefghij", 0, 5, 5);
+    test("abcdefghij", 5, 1, "abcdefghij", 0, 9, 5);
+    test("abcdefghij", 5, 1, "abcdefghij", 0, 10, 5);
+    test("abcdefghij", 5, 1, "abcdefghij", 0, 11, 5);
+    test("abcdefghij", 5, 1, "abcdefghij", 1, 0, 1);
+    test("abcdefghij", 5, 1, "abcdefghij", 1, 1, 4);
+    test("abcdefghij", 5, 1, "abcdefghij", 1, 4, 4);
+    test("abcdefghij", 5, 1, "abcdefghij", 1, 8, 4);
+    test("abcdefghij", 5, 1, "abcdefghij", 1, 9, 4);
+    test("abcdefghij", 5, 1, "abcdefghij", 1, 10, 4);
+    test("abcdefghij", 5, 1, "abcdefghij", 5, 0, 1);
+    test("abcdefghij", 5, 1, "abcdefghij", 5, 1, 0);
+    test("abcdefghij", 5, 1, "abcdefghij", 5, 2, -1);
+    test("abcdefghij", 5, 1, "abcdefghij", 5, 4, -3);
+    test("abcdefghij", 5, 1, "abcdefghij", 5, 5, -4);
+    test("abcdefghij", 5, 1, "abcdefghij", 5, 6, -4);
+    test("abcdefghij", 5, 1, "abcdefghij", 9, 0, 1);
+    test("abcdefghij", 5, 1, "abcdefghij", 9, 1, -4);
+    test("abcdefghij", 5, 1, "abcdefghij", 9, 2, -4);
+    test("abcdefghij", 5, 1, "abcdefghij", 10, 0, 1);
+    test("abcdefghij", 5, 1, "abcdefghij", 10, 1, 1);
+    test("abcdefghij", 5, 1, "abcdefghij", 11, 0, 0);
+    test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 0, 0, 1);
+    test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 0, 1, 5);
+    test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 0, 10, 5);
+    test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 0, 19, 5);
+    test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 0, 20, 5);
+    test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 0, 21, 5);
+    test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 1, 0, 1);
+    test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 1, 1, 4);
+    test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 1, 9, 4);
+    test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 1, 18, 4);
+    test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 1, 19, 4);
+    test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 1, 20, 4);
+    test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 10, 0, 1);
+    test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 10, 1, -5);
+    test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 10, 5, -5);
+    test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 10, 9, -5);
+    test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 10, 10, -5);
+    test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 10, 11, -5);
+    test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 19, 0, 1);
+    test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 19, 1, -14);
+    test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 19, 2, -14);
+    test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 20, 0, 1);
+    test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 20, 1, 1);
+    test("abcdefghij", 5, 1, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghij", 5, 2, "", 0, 0, 2);
+    test("abcdefghij", 5, 2, "", 0, 1, 2);
+    test("abcdefghij", 5, 2, "", 1, 0, 0);
+    test("abcdefghij", 5, 2, "abcde", 0, 0, 2);
+    test("abcdefghij", 5, 2, "abcde", 0, 1, 5);
+    test("abcdefghij", 5, 2, "abcde", 0, 2, 5);
+    test("abcdefghij", 5, 2, "abcde", 0, 4, 5);
+    test("abcdefghij", 5, 2, "abcde", 0, 5, 5);
+    test("abcdefghij", 5, 2, "abcde", 0, 6, 5);
+    test("abcdefghij", 5, 2, "abcde", 1, 0, 2);
+    test("abcdefghij", 5, 2, "abcde", 1, 1, 4);
+    test("abcdefghij", 5, 2, "abcde", 1, 2, 4);
+    test("abcdefghij", 5, 2, "abcde", 1, 3, 4);
+    test("abcdefghij", 5, 2, "abcde", 1, 4, 4);
+    test("abcdefghij", 5, 2, "abcde", 1, 5, 4);
+    test("abcdefghij", 5, 2, "abcde", 2, 0, 2);
+    test("abcdefghij", 5, 2, "abcde", 2, 1, 3);
+    test("abcdefghij", 5, 2, "abcde", 2, 2, 3);
+    test("abcdefghij", 5, 2, "abcde", 2, 3, 3);
+    test("abcdefghij", 5, 2, "abcde", 2, 4, 3);
+    test("abcdefghij", 5, 2, "abcde", 4, 0, 2);
+    test("abcdefghij", 5, 2, "abcde", 4, 1, 1);
+    test("abcdefghij", 5, 2, "abcde", 4, 2, 1);
+    test("abcdefghij", 5, 2, "abcde", 5, 0, 2);
+    test("abcdefghij", 5, 2, "abcde", 5, 1, 2);
+    test("abcdefghij", 5, 2, "abcde", 6, 0, 0);
+    test("abcdefghij", 5, 2, "abcdefghij", 0, 0, 2);
+    test("abcdefghij", 5, 2, "abcdefghij", 0, 1, 5);
+    test("abcdefghij", 5, 2, "abcdefghij", 0, 5, 5);
+    test("abcdefghij", 5, 2, "abcdefghij", 0, 9, 5);
+    test("abcdefghij", 5, 2, "abcdefghij", 0, 10, 5);
+    test("abcdefghij", 5, 2, "abcdefghij", 0, 11, 5);
+    test("abcdefghij", 5, 2, "abcdefghij", 1, 0, 2);
+    test("abcdefghij", 5, 2, "abcdefghij", 1, 1, 4);
+    test("abcdefghij", 5, 2, "abcdefghij", 1, 4, 4);
+    test("abcdefghij", 5, 2, "abcdefghij", 1, 8, 4);
+    test("abcdefghij", 5, 2, "abcdefghij", 1, 9, 4);
+    test("abcdefghij", 5, 2, "abcdefghij", 1, 10, 4);
+    test("abcdefghij", 5, 2, "abcdefghij", 5, 0, 2);
+    test("abcdefghij", 5, 2, "abcdefghij", 5, 1, 1);
+}
+
+void test30()
+{
+    test("abcdefghij", 5, 2, "abcdefghij", 5, 2, 0);
+    test("abcdefghij", 5, 2, "abcdefghij", 5, 4, -2);
+    test("abcdefghij", 5, 2, "abcdefghij", 5, 5, -3);
+    test("abcdefghij", 5, 2, "abcdefghij", 5, 6, -3);
+    test("abcdefghij", 5, 2, "abcdefghij", 9, 0, 2);
+    test("abcdefghij", 5, 2, "abcdefghij", 9, 1, -4);
+    test("abcdefghij", 5, 2, "abcdefghij", 9, 2, -4);
+    test("abcdefghij", 5, 2, "abcdefghij", 10, 0, 2);
+    test("abcdefghij", 5, 2, "abcdefghij", 10, 1, 2);
+    test("abcdefghij", 5, 2, "abcdefghij", 11, 0, 0);
+    test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 0, 0, 2);
+    test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 0, 1, 5);
+    test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 0, 10, 5);
+    test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 0, 19, 5);
+    test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 0, 20, 5);
+    test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 0, 21, 5);
+    test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 1, 0, 2);
+    test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 1, 1, 4);
+    test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 1, 9, 4);
+    test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 1, 18, 4);
+    test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 1, 19, 4);
+    test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 1, 20, 4);
+    test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 10, 0, 2);
+    test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 10, 1, -5);
+    test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 10, 5, -5);
+    test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 10, 9, -5);
+    test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 10, 10, -5);
+    test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 10, 11, -5);
+    test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 19, 0, 2);
+    test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 19, 1, -14);
+    test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 19, 2, -14);
+    test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 20, 0, 2);
+    test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 20, 1, 2);
+    test("abcdefghij", 5, 2, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghij", 5, 4, "", 0, 0, 4);
+    test("abcdefghij", 5, 4, "", 0, 1, 4);
+    test("abcdefghij", 5, 4, "", 1, 0, 0);
+    test("abcdefghij", 5, 4, "abcde", 0, 0, 4);
+    test("abcdefghij", 5, 4, "abcde", 0, 1, 5);
+    test("abcdefghij", 5, 4, "abcde", 0, 2, 5);
+    test("abcdefghij", 5, 4, "abcde", 0, 4, 5);
+    test("abcdefghij", 5, 4, "abcde", 0, 5, 5);
+    test("abcdefghij", 5, 4, "abcde", 0, 6, 5);
+    test("abcdefghij", 5, 4, "abcde", 1, 0, 4);
+    test("abcdefghij", 5, 4, "abcde", 1, 1, 4);
+    test("abcdefghij", 5, 4, "abcde", 1, 2, 4);
+    test("abcdefghij", 5, 4, "abcde", 1, 3, 4);
+    test("abcdefghij", 5, 4, "abcde", 1, 4, 4);
+    test("abcdefghij", 5, 4, "abcde", 1, 5, 4);
+    test("abcdefghij", 5, 4, "abcde", 2, 0, 4);
+    test("abcdefghij", 5, 4, "abcde", 2, 1, 3);
+    test("abcdefghij", 5, 4, "abcde", 2, 2, 3);
+    test("abcdefghij", 5, 4, "abcde", 2, 3, 3);
+    test("abcdefghij", 5, 4, "abcde", 2, 4, 3);
+    test("abcdefghij", 5, 4, "abcde", 4, 0, 4);
+    test("abcdefghij", 5, 4, "abcde", 4, 1, 1);
+    test("abcdefghij", 5, 4, "abcde", 4, 2, 1);
+    test("abcdefghij", 5, 4, "abcde", 5, 0, 4);
+    test("abcdefghij", 5, 4, "abcde", 5, 1, 4);
+    test("abcdefghij", 5, 4, "abcde", 6, 0, 0);
+    test("abcdefghij", 5, 4, "abcdefghij", 0, 0, 4);
+    test("abcdefghij", 5, 4, "abcdefghij", 0, 1, 5);
+    test("abcdefghij", 5, 4, "abcdefghij", 0, 5, 5);
+    test("abcdefghij", 5, 4, "abcdefghij", 0, 9, 5);
+    test("abcdefghij", 5, 4, "abcdefghij", 0, 10, 5);
+    test("abcdefghij", 5, 4, "abcdefghij", 0, 11, 5);
+    test("abcdefghij", 5, 4, "abcdefghij", 1, 0, 4);
+    test("abcdefghij", 5, 4, "abcdefghij", 1, 1, 4);
+    test("abcdefghij", 5, 4, "abcdefghij", 1, 4, 4);
+    test("abcdefghij", 5, 4, "abcdefghij", 1, 8, 4);
+    test("abcdefghij", 5, 4, "abcdefghij", 1, 9, 4);
+    test("abcdefghij", 5, 4, "abcdefghij", 1, 10, 4);
+    test("abcdefghij", 5, 4, "abcdefghij", 5, 0, 4);
+    test("abcdefghij", 5, 4, "abcdefghij", 5, 1, 3);
+    test("abcdefghij", 5, 4, "abcdefghij", 5, 2, 2);
+    test("abcdefghij", 5, 4, "abcdefghij", 5, 4, 0);
+    test("abcdefghij", 5, 4, "abcdefghij", 5, 5, -1);
+    test("abcdefghij", 5, 4, "abcdefghij", 5, 6, -1);
+    test("abcdefghij", 5, 4, "abcdefghij", 9, 0, 4);
+    test("abcdefghij", 5, 4, "abcdefghij", 9, 1, -4);
+    test("abcdefghij", 5, 4, "abcdefghij", 9, 2, -4);
+    test("abcdefghij", 5, 4, "abcdefghij", 10, 0, 4);
+    test("abcdefghij", 5, 4, "abcdefghij", 10, 1, 4);
+    test("abcdefghij", 5, 4, "abcdefghij", 11, 0, 0);
+    test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 0, 0, 4);
+    test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 0, 1, 5);
+    test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 0, 10, 5);
+    test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 0, 19, 5);
+    test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 0, 20, 5);
+    test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 0, 21, 5);
+    test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 1, 0, 4);
+    test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 1, 1, 4);
+    test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 1, 9, 4);
+    test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 1, 18, 4);
+    test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 1, 19, 4);
+    test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 1, 20, 4);
+    test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 10, 0, 4);
+    test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 10, 1, -5);
+    test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 10, 5, -5);
+    test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 10, 9, -5);
+}
+
+void test31()
+{
+    test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 10, 10, -5);
+    test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 10, 11, -5);
+    test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 19, 0, 4);
+    test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 19, 1, -14);
+    test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 19, 2, -14);
+    test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 20, 0, 4);
+    test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 20, 1, 4);
+    test("abcdefghij", 5, 4, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghij", 5, 5, "", 0, 0, 5);
+    test("abcdefghij", 5, 5, "", 0, 1, 5);
+    test("abcdefghij", 5, 5, "", 1, 0, 0);
+    test("abcdefghij", 5, 5, "abcde", 0, 0, 5);
+    test("abcdefghij", 5, 5, "abcde", 0, 1, 5);
+    test("abcdefghij", 5, 5, "abcde", 0, 2, 5);
+    test("abcdefghij", 5, 5, "abcde", 0, 4, 5);
+    test("abcdefghij", 5, 5, "abcde", 0, 5, 5);
+    test("abcdefghij", 5, 5, "abcde", 0, 6, 5);
+    test("abcdefghij", 5, 5, "abcde", 1, 0, 5);
+    test("abcdefghij", 5, 5, "abcde", 1, 1, 4);
+    test("abcdefghij", 5, 5, "abcde", 1, 2, 4);
+    test("abcdefghij", 5, 5, "abcde", 1, 3, 4);
+    test("abcdefghij", 5, 5, "abcde", 1, 4, 4);
+    test("abcdefghij", 5, 5, "abcde", 1, 5, 4);
+    test("abcdefghij", 5, 5, "abcde", 2, 0, 5);
+    test("abcdefghij", 5, 5, "abcde", 2, 1, 3);
+    test("abcdefghij", 5, 5, "abcde", 2, 2, 3);
+    test("abcdefghij", 5, 5, "abcde", 2, 3, 3);
+    test("abcdefghij", 5, 5, "abcde", 2, 4, 3);
+    test("abcdefghij", 5, 5, "abcde", 4, 0, 5);
+    test("abcdefghij", 5, 5, "abcde", 4, 1, 1);
+    test("abcdefghij", 5, 5, "abcde", 4, 2, 1);
+    test("abcdefghij", 5, 5, "abcde", 5, 0, 5);
+    test("abcdefghij", 5, 5, "abcde", 5, 1, 5);
+    test("abcdefghij", 5, 5, "abcde", 6, 0, 0);
+    test("abcdefghij", 5, 5, "abcdefghij", 0, 0, 5);
+    test("abcdefghij", 5, 5, "abcdefghij", 0, 1, 5);
+    test("abcdefghij", 5, 5, "abcdefghij", 0, 5, 5);
+    test("abcdefghij", 5, 5, "abcdefghij", 0, 9, 5);
+    test("abcdefghij", 5, 5, "abcdefghij", 0, 10, 5);
+    test("abcdefghij", 5, 5, "abcdefghij", 0, 11, 5);
+    test("abcdefghij", 5, 5, "abcdefghij", 1, 0, 5);
+    test("abcdefghij", 5, 5, "abcdefghij", 1, 1, 4);
+    test("abcdefghij", 5, 5, "abcdefghij", 1, 4, 4);
+    test("abcdefghij", 5, 5, "abcdefghij", 1, 8, 4);
+    test("abcdefghij", 5, 5, "abcdefghij", 1, 9, 4);
+    test("abcdefghij", 5, 5, "abcdefghij", 1, 10, 4);
+    test("abcdefghij", 5, 5, "abcdefghij", 5, 0, 5);
+    test("abcdefghij", 5, 5, "abcdefghij", 5, 1, 4);
+    test("abcdefghij", 5, 5, "abcdefghij", 5, 2, 3);
+    test("abcdefghij", 5, 5, "abcdefghij", 5, 4, 1);
+    test("abcdefghij", 5, 5, "abcdefghij", 5, 5, 0);
+    test("abcdefghij", 5, 5, "abcdefghij", 5, 6, 0);
+    test("abcdefghij", 5, 5, "abcdefghij", 9, 0, 5);
+    test("abcdefghij", 5, 5, "abcdefghij", 9, 1, -4);
+    test("abcdefghij", 5, 5, "abcdefghij", 9, 2, -4);
+    test("abcdefghij", 5, 5, "abcdefghij", 10, 0, 5);
+    test("abcdefghij", 5, 5, "abcdefghij", 10, 1, 5);
+    test("abcdefghij", 5, 5, "abcdefghij", 11, 0, 0);
+    test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 0, 0, 5);
+    test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 0, 1, 5);
+    test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 0, 10, 5);
+    test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 0, 19, 5);
+    test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 0, 20, 5);
+    test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 0, 21, 5);
+    test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 1, 0, 5);
+    test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 1, 1, 4);
+    test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 1, 9, 4);
+    test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 1, 18, 4);
+    test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 1, 19, 4);
+    test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 1, 20, 4);
+    test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 10, 0, 5);
+    test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 10, 1, -5);
+    test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 10, 5, -5);
+    test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 10, 9, -5);
+    test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 10, 10, -5);
+    test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 10, 11, -5);
+    test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 19, 0, 5);
+    test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 19, 1, -14);
+    test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 19, 2, -14);
+    test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 20, 0, 5);
+    test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 20, 1, 5);
+    test("abcdefghij", 5, 5, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghij", 5, 6, "", 0, 0, 5);
+    test("abcdefghij", 5, 6, "", 0, 1, 5);
+    test("abcdefghij", 5, 6, "", 1, 0, 0);
+    test("abcdefghij", 5, 6, "abcde", 0, 0, 5);
+    test("abcdefghij", 5, 6, "abcde", 0, 1, 5);
+    test("abcdefghij", 5, 6, "abcde", 0, 2, 5);
+    test("abcdefghij", 5, 6, "abcde", 0, 4, 5);
+    test("abcdefghij", 5, 6, "abcde", 0, 5, 5);
+    test("abcdefghij", 5, 6, "abcde", 0, 6, 5);
+    test("abcdefghij", 5, 6, "abcde", 1, 0, 5);
+    test("abcdefghij", 5, 6, "abcde", 1, 1, 4);
+    test("abcdefghij", 5, 6, "abcde", 1, 2, 4);
+    test("abcdefghij", 5, 6, "abcde", 1, 3, 4);
+    test("abcdefghij", 5, 6, "abcde", 1, 4, 4);
+    test("abcdefghij", 5, 6, "abcde", 1, 5, 4);
+    test("abcdefghij", 5, 6, "abcde", 2, 0, 5);
+    test("abcdefghij", 5, 6, "abcde", 2, 1, 3);
+    test("abcdefghij", 5, 6, "abcde", 2, 2, 3);
+}
+
+void test32()
+{
+    test("abcdefghij", 5, 6, "abcde", 2, 3, 3);
+    test("abcdefghij", 5, 6, "abcde", 2, 4, 3);
+    test("abcdefghij", 5, 6, "abcde", 4, 0, 5);
+    test("abcdefghij", 5, 6, "abcde", 4, 1, 1);
+    test("abcdefghij", 5, 6, "abcde", 4, 2, 1);
+    test("abcdefghij", 5, 6, "abcde", 5, 0, 5);
+    test("abcdefghij", 5, 6, "abcde", 5, 1, 5);
+    test("abcdefghij", 5, 6, "abcde", 6, 0, 0);
+    test("abcdefghij", 5, 6, "abcdefghij", 0, 0, 5);
+    test("abcdefghij", 5, 6, "abcdefghij", 0, 1, 5);
+    test("abcdefghij", 5, 6, "abcdefghij", 0, 5, 5);
+    test("abcdefghij", 5, 6, "abcdefghij", 0, 9, 5);
+    test("abcdefghij", 5, 6, "abcdefghij", 0, 10, 5);
+    test("abcdefghij", 5, 6, "abcdefghij", 0, 11, 5);
+    test("abcdefghij", 5, 6, "abcdefghij", 1, 0, 5);
+    test("abcdefghij", 5, 6, "abcdefghij", 1, 1, 4);
+    test("abcdefghij", 5, 6, "abcdefghij", 1, 4, 4);
+    test("abcdefghij", 5, 6, "abcdefghij", 1, 8, 4);
+    test("abcdefghij", 5, 6, "abcdefghij", 1, 9, 4);
+    test("abcdefghij", 5, 6, "abcdefghij", 1, 10, 4);
+    test("abcdefghij", 5, 6, "abcdefghij", 5, 0, 5);
+    test("abcdefghij", 5, 6, "abcdefghij", 5, 1, 4);
+    test("abcdefghij", 5, 6, "abcdefghij", 5, 2, 3);
+    test("abcdefghij", 5, 6, "abcdefghij", 5, 4, 1);
+    test("abcdefghij", 5, 6, "abcdefghij", 5, 5, 0);
+    test("abcdefghij", 5, 6, "abcdefghij", 5, 6, 0);
+    test("abcdefghij", 5, 6, "abcdefghij", 9, 0, 5);
+    test("abcdefghij", 5, 6, "abcdefghij", 9, 1, -4);
+    test("abcdefghij", 5, 6, "abcdefghij", 9, 2, -4);
+    test("abcdefghij", 5, 6, "abcdefghij", 10, 0, 5);
+    test("abcdefghij", 5, 6, "abcdefghij", 10, 1, 5);
+    test("abcdefghij", 5, 6, "abcdefghij", 11, 0, 0);
+    test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 0, 0, 5);
+    test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 0, 1, 5);
+    test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 0, 10, 5);
+    test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 0, 19, 5);
+    test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 0, 20, 5);
+    test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 0, 21, 5);
+    test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 1, 0, 5);
+    test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 1, 1, 4);
+    test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 1, 9, 4);
+    test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 1, 18, 4);
+    test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 1, 19, 4);
+    test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 1, 20, 4);
+    test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 10, 0, 5);
+    test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 10, 1, -5);
+    test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 10, 5, -5);
+    test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 10, 9, -5);
+    test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 10, 10, -5);
+    test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 10, 11, -5);
+    test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 19, 0, 5);
+    test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 19, 1, -14);
+    test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 19, 2, -14);
+    test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 20, 0, 5);
+    test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 20, 1, 5);
+    test("abcdefghij", 5, 6, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghij", 9, 0, "", 0, 0, 0);
+    test("abcdefghij", 9, 0, "", 0, 1, 0);
+    test("abcdefghij", 9, 0, "", 1, 0, 0);
+    test("abcdefghij", 9, 0, "abcde", 0, 0, 0);
+    test("abcdefghij", 9, 0, "abcde", 0, 1, -1);
+    test("abcdefghij", 9, 0, "abcde", 0, 2, -2);
+    test("abcdefghij", 9, 0, "abcde", 0, 4, -4);
+    test("abcdefghij", 9, 0, "abcde", 0, 5, -5);
+    test("abcdefghij", 9, 0, "abcde", 0, 6, -5);
+    test("abcdefghij", 9, 0, "abcde", 1, 0, 0);
+    test("abcdefghij", 9, 0, "abcde", 1, 1, -1);
+    test("abcdefghij", 9, 0, "abcde", 1, 2, -2);
+    test("abcdefghij", 9, 0, "abcde", 1, 3, -3);
+    test("abcdefghij", 9, 0, "abcde", 1, 4, -4);
+    test("abcdefghij", 9, 0, "abcde", 1, 5, -4);
+    test("abcdefghij", 9, 0, "abcde", 2, 0, 0);
+    test("abcdefghij", 9, 0, "abcde", 2, 1, -1);
+    test("abcdefghij", 9, 0, "abcde", 2, 2, -2);
+    test("abcdefghij", 9, 0, "abcde", 2, 3, -3);
+    test("abcdefghij", 9, 0, "abcde", 2, 4, -3);
+    test("abcdefghij", 9, 0, "abcde", 4, 0, 0);
+    test("abcdefghij", 9, 0, "abcde", 4, 1, -1);
+    test("abcdefghij", 9, 0, "abcde", 4, 2, -1);
+    test("abcdefghij", 9, 0, "abcde", 5, 0, 0);
+    test("abcdefghij", 9, 0, "abcde", 5, 1, 0);
+    test("abcdefghij", 9, 0, "abcde", 6, 0, 0);
+    test("abcdefghij", 9, 0, "abcdefghij", 0, 0, 0);
+    test("abcdefghij", 9, 0, "abcdefghij", 0, 1, -1);
+    test("abcdefghij", 9, 0, "abcdefghij", 0, 5, -5);
+    test("abcdefghij", 9, 0, "abcdefghij", 0, 9, -9);
+    test("abcdefghij", 9, 0, "abcdefghij", 0, 10, -10);
+    test("abcdefghij", 9, 0, "abcdefghij", 0, 11, -10);
+    test("abcdefghij", 9, 0, "abcdefghij", 1, 0, 0);
+    test("abcdefghij", 9, 0, "abcdefghij", 1, 1, -1);
+    test("abcdefghij", 9, 0, "abcdefghij", 1, 4, -4);
+    test("abcdefghij", 9, 0, "abcdefghij", 1, 8, -8);
+    test("abcdefghij", 9, 0, "abcdefghij", 1, 9, -9);
+    test("abcdefghij", 9, 0, "abcdefghij", 1, 10, -9);
+    test("abcdefghij", 9, 0, "abcdefghij", 5, 0, 0);
+    test("abcdefghij", 9, 0, "abcdefghij", 5, 1, -1);
+    test("abcdefghij", 9, 0, "abcdefghij", 5, 2, -2);
+    test("abcdefghij", 9, 0, "abcdefghij", 5, 4, -4);
+    test("abcdefghij", 9, 0, "abcdefghij", 5, 5, -5);
+    test("abcdefghij", 9, 0, "abcdefghij", 5, 6, -5);
+}
+
+void test33()
+{
+    test("abcdefghij", 9, 0, "abcdefghij", 9, 0, 0);
+    test("abcdefghij", 9, 0, "abcdefghij", 9, 1, -1);
+    test("abcdefghij", 9, 0, "abcdefghij", 9, 2, -1);
+    test("abcdefghij", 9, 0, "abcdefghij", 10, 0, 0);
+    test("abcdefghij", 9, 0, "abcdefghij", 10, 1, 0);
+    test("abcdefghij", 9, 0, "abcdefghij", 11, 0, 0);
+    test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", 0, 0, 0);
+    test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", 0, 1, -1);
+    test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", 0, 10, -10);
+    test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", 0, 19, -19);
+    test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", 0, 20, -20);
+    test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", 0, 21, -20);
+    test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", 1, 0, 0);
+    test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", 1, 9, -9);
+    test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", 1, 18, -18);
+    test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", 1, 19, -19);
+    test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", 1, 20, -19);
+    test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", 10, 0, 0);
+    test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", 10, 1, -1);
+    test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", 10, 5, -5);
+    test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", 10, 11, -10);
+    test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", 19, 0, 0);
+    test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", 19, 1, -1);
+    test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", 19, 2, -1);
+    test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", 20, 0, 0);
+    test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", 20, 1, 0);
+    test("abcdefghij", 9, 0, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghij", 9, 1, "", 0, 0, 1);
+    test("abcdefghij", 9, 1, "", 0, 1, 1);
+    test("abcdefghij", 9, 1, "", 1, 0, 0);
+    test("abcdefghij", 9, 1, "abcde", 0, 0, 1);
+    test("abcdefghij", 9, 1, "abcde", 0, 1, 9);
+    test("abcdefghij", 9, 1, "abcde", 0, 2, 9);
+    test("abcdefghij", 9, 1, "abcde", 0, 4, 9);
+    test("abcdefghij", 9, 1, "abcde", 0, 5, 9);
+    test("abcdefghij", 9, 1, "abcde", 0, 6, 9);
+    test("abcdefghij", 9, 1, "abcde", 1, 0, 1);
+    test("abcdefghij", 9, 1, "abcde", 1, 1, 8);
+    test("abcdefghij", 9, 1, "abcde", 1, 2, 8);
+    test("abcdefghij", 9, 1, "abcde", 1, 3, 8);
+    test("abcdefghij", 9, 1, "abcde", 1, 4, 8);
+    test("abcdefghij", 9, 1, "abcde", 1, 5, 8);
+    test("abcdefghij", 9, 1, "abcde", 2, 0, 1);
+    test("abcdefghij", 9, 1, "abcde", 2, 1, 7);
+    test("abcdefghij", 9, 1, "abcde", 2, 2, 7);
+    test("abcdefghij", 9, 1, "abcde", 2, 3, 7);
+    test("abcdefghij", 9, 1, "abcde", 2, 4, 7);
+    test("abcdefghij", 9, 1, "abcde", 4, 0, 1);
+    test("abcdefghij", 9, 1, "abcde", 4, 1, 5);
+    test("abcdefghij", 9, 1, "abcde", 4, 2, 5);
+    test("abcdefghij", 9, 1, "abcde", 5, 0, 1);
+    test("abcdefghij", 9, 1, "abcde", 5, 1, 1);
+    test("abcdefghij", 9, 1, "abcde", 6, 0, 0);
+    test("abcdefghij", 9, 1, "abcdefghij", 0, 0, 1);
+    test("abcdefghij", 9, 1, "abcdefghij", 0, 1, 9);
+    test("abcdefghij", 9, 1, "abcdefghij", 0, 5, 9);
+    test("abcdefghij", 9, 1, "abcdefghij", 0, 9, 9);
+    test("abcdefghij", 9, 1, "abcdefghij", 0, 10, 9);
+    test("abcdefghij", 9, 1, "abcdefghij", 0, 11, 9);
+    test("abcdefghij", 9, 1, "abcdefghij", 1, 0, 1);
+    test("abcdefghij", 9, 1, "abcdefghij", 1, 1, 8);
+    test("abcdefghij", 9, 1, "abcdefghij", 1, 4, 8);
+    test("abcdefghij", 9, 1, "abcdefghij", 1, 8, 8);
+    test("abcdefghij", 9, 1, "abcdefghij", 1, 9, 8);
+    test("abcdefghij", 9, 1, "abcdefghij", 1, 10, 8);
+    test("abcdefghij", 9, 1, "abcdefghij", 5, 0, 1);
+    test("abcdefghij", 9, 1, "abcdefghij", 5, 1, 4);
+    test("abcdefghij", 9, 1, "abcdefghij", 5, 2, 4);
+    test("abcdefghij", 9, 1, "abcdefghij", 5, 4, 4);
+    test("abcdefghij", 9, 1, "abcdefghij", 5, 5, 4);
+    test("abcdefghij", 9, 1, "abcdefghij", 5, 6, 4);
+    test("abcdefghij", 9, 1, "abcdefghij", 9, 0, 1);
+    test("abcdefghij", 9, 1, "abcdefghij", 9, 1, 0);
+    test("abcdefghij", 9, 1, "abcdefghij", 9, 2, 0);
+    test("abcdefghij", 9, 1, "abcdefghij", 10, 0, 1);
+    test("abcdefghij", 9, 1, "abcdefghij", 10, 1, 1);
+    test("abcdefghij", 9, 1, "abcdefghij", 11, 0, 0);
+    test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 0, 0, 1);
+    test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 0, 1, 9);
+    test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 0, 10, 9);
+    test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 0, 19, 9);
+    test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 0, 20, 9);
+    test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 0, 21, 9);
+    test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 1, 0, 1);
+    test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 1, 1, 8);
+    test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 1, 9, 8);
+    test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 1, 18, 8);
+    test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 1, 19, 8);
+    test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 1, 20, 8);
+    test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 10, 0, 1);
+    test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 10, 1, -1);
+    test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 10, 5, -1);
+    test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 10, 9, -1);
+    test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 10, 10, -1);
+    test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 10, 11, -1);
+    test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 19, 0, 1);
+    test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 19, 1, -10);
+}
+
+void test34()
+{
+    test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 19, 2, -10);
+    test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 20, 0, 1);
+    test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 20, 1, 1);
+    test("abcdefghij", 9, 1, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghij", 9, 2, "", 0, 0, 1);
+    test("abcdefghij", 9, 2, "", 0, 1, 1);
+    test("abcdefghij", 9, 2, "", 1, 0, 0);
+    test("abcdefghij", 9, 2, "abcde", 0, 0, 1);
+    test("abcdefghij", 9, 2, "abcde", 0, 1, 9);
+    test("abcdefghij", 9, 2, "abcde", 0, 2, 9);
+    test("abcdefghij", 9, 2, "abcde", 0, 4, 9);
+    test("abcdefghij", 9, 2, "abcde", 0, 5, 9);
+    test("abcdefghij", 9, 2, "abcde", 0, 6, 9);
+    test("abcdefghij", 9, 2, "abcde", 1, 0, 1);
+    test("abcdefghij", 9, 2, "abcde", 1, 1, 8);
+    test("abcdefghij", 9, 2, "abcde", 1, 2, 8);
+    test("abcdefghij", 9, 2, "abcde", 1, 3, 8);
+    test("abcdefghij", 9, 2, "abcde", 1, 4, 8);
+    test("abcdefghij", 9, 2, "abcde", 1, 5, 8);
+    test("abcdefghij", 9, 2, "abcde", 2, 0, 1);
+    test("abcdefghij", 9, 2, "abcde", 2, 1, 7);
+    test("abcdefghij", 9, 2, "abcde", 2, 2, 7);
+    test("abcdefghij", 9, 2, "abcde", 2, 3, 7);
+    test("abcdefghij", 9, 2, "abcde", 2, 4, 7);
+    test("abcdefghij", 9, 2, "abcde", 4, 0, 1);
+    test("abcdefghij", 9, 2, "abcde", 4, 1, 5);
+    test("abcdefghij", 9, 2, "abcde", 4, 2, 5);
+    test("abcdefghij", 9, 2, "abcde", 5, 0, 1);
+    test("abcdefghij", 9, 2, "abcde", 5, 1, 1);
+    test("abcdefghij", 9, 2, "abcde", 6, 0, 0);
+    test("abcdefghij", 9, 2, "abcdefghij", 0, 0, 1);
+    test("abcdefghij", 9, 2, "abcdefghij", 0, 1, 9);
+    test("abcdefghij", 9, 2, "abcdefghij", 0, 5, 9);
+    test("abcdefghij", 9, 2, "abcdefghij", 0, 9, 9);
+    test("abcdefghij", 9, 2, "abcdefghij", 0, 10, 9);
+    test("abcdefghij", 9, 2, "abcdefghij", 0, 11, 9);
+    test("abcdefghij", 9, 2, "abcdefghij", 1, 0, 1);
+    test("abcdefghij", 9, 2, "abcdefghij", 1, 1, 8);
+    test("abcdefghij", 9, 2, "abcdefghij", 1, 4, 8);
+    test("abcdefghij", 9, 2, "abcdefghij", 1, 8, 8);
+    test("abcdefghij", 9, 2, "abcdefghij", 1, 9, 8);
+    test("abcdefghij", 9, 2, "abcdefghij", 1, 10, 8);
+    test("abcdefghij", 9, 2, "abcdefghij", 5, 0, 1);
+    test("abcdefghij", 9, 2, "abcdefghij", 5, 1, 4);
+    test("abcdefghij", 9, 2, "abcdefghij", 5, 2, 4);
+    test("abcdefghij", 9, 2, "abcdefghij", 5, 4, 4);
+    test("abcdefghij", 9, 2, "abcdefghij", 5, 5, 4);
+    test("abcdefghij", 9, 2, "abcdefghij", 5, 6, 4);
+    test("abcdefghij", 9, 2, "abcdefghij", 9, 0, 1);
+    test("abcdefghij", 9, 2, "abcdefghij", 9, 1, 0);
+    test("abcdefghij", 9, 2, "abcdefghij", 9, 2, 0);
+    test("abcdefghij", 9, 2, "abcdefghij", 10, 0, 1);
+    test("abcdefghij", 9, 2, "abcdefghij", 10, 1, 1);
+    test("abcdefghij", 9, 2, "abcdefghij", 11, 0, 0);
+    test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 0, 0, 1);
+    test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 0, 1, 9);
+    test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 0, 10, 9);
+    test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 0, 19, 9);
+    test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 0, 20, 9);
+    test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 0, 21, 9);
+    test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 1, 0, 1);
+    test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 1, 1, 8);
+    test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 1, 9, 8);
+    test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 1, 18, 8);
+    test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 1, 19, 8);
+    test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 1, 20, 8);
+    test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 10, 0, 1);
+    test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 10, 1, -1);
+    test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 10, 5, -1);
+    test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 10, 9, -1);
+    test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 10, 10, -1);
+    test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 10, 11, -1);
+    test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 19, 0, 1);
+    test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 19, 1, -10);
+    test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 19, 2, -10);
+    test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 20, 0, 1);
+    test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 20, 1, 1);
+    test("abcdefghij", 9, 2, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghij", 10, 0, "", 0, 0, 0);
+    test("abcdefghij", 10, 0, "", 0, 1, 0);
+    test("abcdefghij", 10, 0, "", 1, 0, 0);
+    test("abcdefghij", 10, 0, "abcde", 0, 0, 0);
+    test("abcdefghij", 10, 0, "abcde", 0, 1, -1);
+    test("abcdefghij", 10, 0, "abcde", 0, 2, -2);
+    test("abcdefghij", 10, 0, "abcde", 0, 4, -4);
+    test("abcdefghij", 10, 0, "abcde", 0, 5, -5);
+    test("abcdefghij", 10, 0, "abcde", 0, 6, -5);
+    test("abcdefghij", 10, 0, "abcde", 1, 0, 0);
+    test("abcdefghij", 10, 0, "abcde", 1, 1, -1);
+    test("abcdefghij", 10, 0, "abcde", 1, 2, -2);
+    test("abcdefghij", 10, 0, "abcde", 1, 3, -3);
+    test("abcdefghij", 10, 0, "abcde", 1, 4, -4);
+    test("abcdefghij", 10, 0, "abcde", 1, 5, -4);
+    test("abcdefghij", 10, 0, "abcde", 2, 0, 0);
+    test("abcdefghij", 10, 0, "abcde", 2, 1, -1);
+    test("abcdefghij", 10, 0, "abcde", 2, 2, -2);
+    test("abcdefghij", 10, 0, "abcde", 2, 3, -3);
+    test("abcdefghij", 10, 0, "abcde", 2, 4, -3);
+    test("abcdefghij", 10, 0, "abcde", 4, 0, 0);
+    test("abcdefghij", 10, 0, "abcde", 4, 1, -1);
+}
+
+void test35()
+{
+    test("abcdefghij", 10, 0, "abcde", 4, 2, -1);
+    test("abcdefghij", 10, 0, "abcde", 5, 0, 0);
+    test("abcdefghij", 10, 0, "abcde", 5, 1, 0);
+    test("abcdefghij", 10, 0, "abcde", 6, 0, 0);
+    test("abcdefghij", 10, 0, "abcdefghij", 0, 0, 0);
+    test("abcdefghij", 10, 0, "abcdefghij", 0, 1, -1);
+    test("abcdefghij", 10, 0, "abcdefghij", 0, 5, -5);
+    test("abcdefghij", 10, 0, "abcdefghij", 0, 9, -9);
+    test("abcdefghij", 10, 0, "abcdefghij", 0, 10, -10);
+    test("abcdefghij", 10, 0, "abcdefghij", 0, 11, -10);
+    test("abcdefghij", 10, 0, "abcdefghij", 1, 0, 0);
+    test("abcdefghij", 10, 0, "abcdefghij", 1, 1, -1);
+    test("abcdefghij", 10, 0, "abcdefghij", 1, 4, -4);
+    test("abcdefghij", 10, 0, "abcdefghij", 1, 8, -8);
+    test("abcdefghij", 10, 0, "abcdefghij", 1, 9, -9);
+    test("abcdefghij", 10, 0, "abcdefghij", 1, 10, -9);
+    test("abcdefghij", 10, 0, "abcdefghij", 5, 0, 0);
+    test("abcdefghij", 10, 0, "abcdefghij", 5, 1, -1);
+    test("abcdefghij", 10, 0, "abcdefghij", 5, 2, -2);
+    test("abcdefghij", 10, 0, "abcdefghij", 5, 4, -4);
+    test("abcdefghij", 10, 0, "abcdefghij", 5, 5, -5);
+    test("abcdefghij", 10, 0, "abcdefghij", 5, 6, -5);
+    test("abcdefghij", 10, 0, "abcdefghij", 9, 0, 0);
+    test("abcdefghij", 10, 0, "abcdefghij", 9, 1, -1);
+    test("abcdefghij", 10, 0, "abcdefghij", 9, 2, -1);
+    test("abcdefghij", 10, 0, "abcdefghij", 10, 0, 0);
+    test("abcdefghij", 10, 0, "abcdefghij", 10, 1, 0);
+    test("abcdefghij", 10, 0, "abcdefghij", 11, 0, 0);
+    test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", 0, 0, 0);
+    test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", 0, 1, -1);
+    test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", 0, 10, -10);
+    test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", 0, 19, -19);
+    test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", 0, 20, -20);
+    test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", 0, 21, -20);
+    test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", 1, 0, 0);
+    test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", 1, 9, -9);
+    test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", 1, 18, -18);
+    test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", 1, 19, -19);
+    test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", 1, 20, -19);
+    test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", 10, 0, 0);
+    test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", 10, 1, -1);
+    test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", 10, 5, -5);
+    test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", 10, 11, -10);
+    test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", 19, 0, 0);
+    test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", 19, 1, -1);
+    test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", 19, 2, -1);
+    test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", 20, 0, 0);
+    test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", 20, 1, 0);
+    test("abcdefghij", 10, 0, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghij", 10, 1, "", 0, 0, 0);
+    test("abcdefghij", 10, 1, "", 0, 1, 0);
+    test("abcdefghij", 10, 1, "", 1, 0, 0);
+    test("abcdefghij", 10, 1, "abcde", 0, 0, 0);
+    test("abcdefghij", 10, 1, "abcde", 0, 1, -1);
+    test("abcdefghij", 10, 1, "abcde", 0, 2, -2);
+    test("abcdefghij", 10, 1, "abcde", 0, 4, -4);
+    test("abcdefghij", 10, 1, "abcde", 0, 5, -5);
+    test("abcdefghij", 10, 1, "abcde", 0, 6, -5);
+    test("abcdefghij", 10, 1, "abcde", 1, 0, 0);
+    test("abcdefghij", 10, 1, "abcde", 1, 1, -1);
+    test("abcdefghij", 10, 1, "abcde", 1, 2, -2);
+    test("abcdefghij", 10, 1, "abcde", 1, 3, -3);
+    test("abcdefghij", 10, 1, "abcde", 1, 4, -4);
+    test("abcdefghij", 10, 1, "abcde", 1, 5, -4);
+    test("abcdefghij", 10, 1, "abcde", 2, 0, 0);
+    test("abcdefghij", 10, 1, "abcde", 2, 1, -1);
+    test("abcdefghij", 10, 1, "abcde", 2, 2, -2);
+    test("abcdefghij", 10, 1, "abcde", 2, 3, -3);
+    test("abcdefghij", 10, 1, "abcde", 2, 4, -3);
+    test("abcdefghij", 10, 1, "abcde", 4, 0, 0);
+    test("abcdefghij", 10, 1, "abcde", 4, 1, -1);
+    test("abcdefghij", 10, 1, "abcde", 4, 2, -1);
+    test("abcdefghij", 10, 1, "abcde", 5, 0, 0);
+    test("abcdefghij", 10, 1, "abcde", 5, 1, 0);
+    test("abcdefghij", 10, 1, "abcde", 6, 0, 0);
+    test("abcdefghij", 10, 1, "abcdefghij", 0, 0, 0);
+    test("abcdefghij", 10, 1, "abcdefghij", 0, 1, -1);
+    test("abcdefghij", 10, 1, "abcdefghij", 0, 5, -5);
+    test("abcdefghij", 10, 1, "abcdefghij", 0, 9, -9);
+    test("abcdefghij", 10, 1, "abcdefghij", 0, 10, -10);
+    test("abcdefghij", 10, 1, "abcdefghij", 0, 11, -10);
+    test("abcdefghij", 10, 1, "abcdefghij", 1, 0, 0);
+    test("abcdefghij", 10, 1, "abcdefghij", 1, 1, -1);
+    test("abcdefghij", 10, 1, "abcdefghij", 1, 4, -4);
+    test("abcdefghij", 10, 1, "abcdefghij", 1, 8, -8);
+    test("abcdefghij", 10, 1, "abcdefghij", 1, 9, -9);
+    test("abcdefghij", 10, 1, "abcdefghij", 1, 10, -9);
+    test("abcdefghij", 10, 1, "abcdefghij", 5, 0, 0);
+    test("abcdefghij", 10, 1, "abcdefghij", 5, 1, -1);
+    test("abcdefghij", 10, 1, "abcdefghij", 5, 2, -2);
+    test("abcdefghij", 10, 1, "abcdefghij", 5, 4, -4);
+    test("abcdefghij", 10, 1, "abcdefghij", 5, 5, -5);
+    test("abcdefghij", 10, 1, "abcdefghij", 5, 6, -5);
+    test("abcdefghij", 10, 1, "abcdefghij", 9, 0, 0);
+    test("abcdefghij", 10, 1, "abcdefghij", 9, 1, -1);
+    test("abcdefghij", 10, 1, "abcdefghij", 9, 2, -1);
+    test("abcdefghij", 10, 1, "abcdefghij", 10, 0, 0);
+}
+
+void test36()
+{
+    test("abcdefghij", 10, 1, "abcdefghij", 10, 1, 0);
+    test("abcdefghij", 10, 1, "abcdefghij", 11, 0, 0);
+    test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", 0, 0, 0);
+    test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", 0, 1, -1);
+    test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", 0, 10, -10);
+    test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", 0, 19, -19);
+    test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", 0, 20, -20);
+    test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", 0, 21, -20);
+    test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", 1, 0, 0);
+    test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", 1, 9, -9);
+    test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", 1, 18, -18);
+    test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", 1, 19, -19);
+    test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", 1, 20, -19);
+    test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", 10, 0, 0);
+    test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", 10, 1, -1);
+    test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", 10, 5, -5);
+    test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", 10, 11, -10);
+    test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", 19, 0, 0);
+    test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", 19, 1, -1);
+    test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", 19, 2, -1);
+    test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", 20, 0, 0);
+    test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", 20, 1, 0);
+    test("abcdefghij", 10, 1, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghij", 11, 0, "", 0, 0, 0);
+    test("abcdefghij", 11, 0, "", 0, 1, 0);
+    test("abcdefghij", 11, 0, "", 1, 0, 0);
+    test("abcdefghij", 11, 0, "abcde", 0, 0, 0);
+    test("abcdefghij", 11, 0, "abcde", 0, 1, 0);
+    test("abcdefghij", 11, 0, "abcde", 0, 2, 0);
+    test("abcdefghij", 11, 0, "abcde", 0, 4, 0);
+    test("abcdefghij", 11, 0, "abcde", 0, 5, 0);
+    test("abcdefghij", 11, 0, "abcde", 0, 6, 0);
+    test("abcdefghij", 11, 0, "abcde", 1, 0, 0);
+    test("abcdefghij", 11, 0, "abcde", 1, 1, 0);
+    test("abcdefghij", 11, 0, "abcde", 1, 2, 0);
+    test("abcdefghij", 11, 0, "abcde", 1, 3, 0);
+    test("abcdefghij", 11, 0, "abcde", 1, 4, 0);
+    test("abcdefghij", 11, 0, "abcde", 1, 5, 0);
+    test("abcdefghij", 11, 0, "abcde", 2, 0, 0);
+    test("abcdefghij", 11, 0, "abcde", 2, 1, 0);
+    test("abcdefghij", 11, 0, "abcde", 2, 2, 0);
+    test("abcdefghij", 11, 0, "abcde", 2, 3, 0);
+    test("abcdefghij", 11, 0, "abcde", 2, 4, 0);
+    test("abcdefghij", 11, 0, "abcde", 4, 0, 0);
+    test("abcdefghij", 11, 0, "abcde", 4, 1, 0);
+    test("abcdefghij", 11, 0, "abcde", 4, 2, 0);
+    test("abcdefghij", 11, 0, "abcde", 5, 0, 0);
+    test("abcdefghij", 11, 0, "abcde", 5, 1, 0);
+    test("abcdefghij", 11, 0, "abcde", 6, 0, 0);
+    test("abcdefghij", 11, 0, "abcdefghij", 0, 0, 0);
+    test("abcdefghij", 11, 0, "abcdefghij", 0, 1, 0);
+    test("abcdefghij", 11, 0, "abcdefghij", 0, 5, 0);
+    test("abcdefghij", 11, 0, "abcdefghij", 0, 9, 0);
+    test("abcdefghij", 11, 0, "abcdefghij", 0, 10, 0);
+    test("abcdefghij", 11, 0, "abcdefghij", 0, 11, 0);
+    test("abcdefghij", 11, 0, "abcdefghij", 1, 0, 0);
+    test("abcdefghij", 11, 0, "abcdefghij", 1, 1, 0);
+    test("abcdefghij", 11, 0, "abcdefghij", 1, 4, 0);
+    test("abcdefghij", 11, 0, "abcdefghij", 1, 8, 0);
+    test("abcdefghij", 11, 0, "abcdefghij", 1, 9, 0);
+    test("abcdefghij", 11, 0, "abcdefghij", 1, 10, 0);
+    test("abcdefghij", 11, 0, "abcdefghij", 5, 0, 0);
+    test("abcdefghij", 11, 0, "abcdefghij", 5, 1, 0);
+    test("abcdefghij", 11, 0, "abcdefghij", 5, 2, 0);
+    test("abcdefghij", 11, 0, "abcdefghij", 5, 4, 0);
+    test("abcdefghij", 11, 0, "abcdefghij", 5, 5, 0);
+    test("abcdefghij", 11, 0, "abcdefghij", 5, 6, 0);
+    test("abcdefghij", 11, 0, "abcdefghij", 9, 0, 0);
+    test("abcdefghij", 11, 0, "abcdefghij", 9, 1, 0);
+    test("abcdefghij", 11, 0, "abcdefghij", 9, 2, 0);
+    test("abcdefghij", 11, 0, "abcdefghij", 10, 0, 0);
+    test("abcdefghij", 11, 0, "abcdefghij", 10, 1, 0);
+    test("abcdefghij", 11, 0, "abcdefghij", 11, 0, 0);
+    test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 0, 0, 0);
+    test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 0, 1, 0);
+    test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 0, 10, 0);
+    test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 0, 19, 0);
+    test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 0, 20, 0);
+    test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 0, 21, 0);
+    test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 1, 0, 0);
+    test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 1, 1, 0);
+    test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 1, 9, 0);
+    test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 1, 18, 0);
+    test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 1, 19, 0);
+    test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 1, 20, 0);
+    test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 10, 0, 0);
+    test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 10, 1, 0);
+    test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 10, 5, 0);
+    test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 10, 9, 0);
+    test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 10, 10, 0);
+    test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 10, 11, 0);
+    test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 19, 0, 0);
+    test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 19, 1, 0);
+    test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 19, 2, 0);
+    test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 20, 0, 0);
+    test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 20, 1, 0);
+    test("abcdefghij", 11, 0, "abcdefghijklmnopqrst", 21, 0, 0);
+}
+
+void test37()
+{
+    test("abcdefghijklmnopqrst", 0, 0, "", 0, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 0, "", 0, 1, 0);
+    test("abcdefghijklmnopqrst", 0, 0, "", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 0, "abcde", 0, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 0, "abcde", 0, 1, -1);
+    test("abcdefghijklmnopqrst", 0, 0, "abcde", 0, 2, -2);
+    test("abcdefghijklmnopqrst", 0, 0, "abcde", 0, 4, -4);
+    test("abcdefghijklmnopqrst", 0, 0, "abcde", 0, 5, -5);
+    test("abcdefghijklmnopqrst", 0, 0, "abcde", 0, 6, -5);
+    test("abcdefghijklmnopqrst", 0, 0, "abcde", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 0, "abcde", 1, 1, -1);
+    test("abcdefghijklmnopqrst", 0, 0, "abcde", 1, 2, -2);
+    test("abcdefghijklmnopqrst", 0, 0, "abcde", 1, 3, -3);
+    test("abcdefghijklmnopqrst", 0, 0, "abcde", 1, 4, -4);
+    test("abcdefghijklmnopqrst", 0, 0, "abcde", 1, 5, -4);
+    test("abcdefghijklmnopqrst", 0, 0, "abcde", 2, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 0, "abcde", 2, 1, -1);
+    test("abcdefghijklmnopqrst", 0, 0, "abcde", 2, 2, -2);
+    test("abcdefghijklmnopqrst", 0, 0, "abcde", 2, 3, -3);
+    test("abcdefghijklmnopqrst", 0, 0, "abcde", 2, 4, -3);
+    test("abcdefghijklmnopqrst", 0, 0, "abcde", 4, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 0, "abcde", 4, 1, -1);
+    test("abcdefghijklmnopqrst", 0, 0, "abcde", 4, 2, -1);
+    test("abcdefghijklmnopqrst", 0, 0, "abcde", 5, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 0, "abcde", 5, 1, 0);
+    test("abcdefghijklmnopqrst", 0, 0, "abcde", 6, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", 0, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", 0, 1, -1);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", 0, 5, -5);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", 0, 9, -9);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", 0, 10, -10);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", 0, 11, -10);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", 1, 1, -1);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", 1, 4, -4);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", 1, 8, -8);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", 1, 9, -9);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", 1, 10, -9);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", 5, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", 5, 1, -1);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", 5, 2, -2);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", 5, 4, -4);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", 5, 5, -5);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", 5, 6, -5);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", 9, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", 9, 1, -1);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", 9, 2, -1);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", 10, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", 10, 1, 0);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghij", 11, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", 0, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", 0, 1, -1);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", 0, 10, -10);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", 0, 19, -19);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", 0, 20, -20);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", 0, 21, -20);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", 1, 9, -9);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", 1, 18, -18);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", 1, 19, -19);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", 1, 20, -19);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", 10, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", 10, 1, -1);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", 10, 5, -5);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", 10, 11, -10);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", 19, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", 19, 1, -1);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", 19, 2, -1);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", 20, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", 20, 1, 0);
+    test("abcdefghijklmnopqrst", 0, 0, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 1, "", 0, 0, 1);
+    test("abcdefghijklmnopqrst", 0, 1, "", 0, 1, 1);
+    test("abcdefghijklmnopqrst", 0, 1, "", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 1, "abcde", 0, 0, 1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcde", 0, 1, 0);
+    test("abcdefghijklmnopqrst", 0, 1, "abcde", 0, 2, -1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcde", 0, 4, -3);
+    test("abcdefghijklmnopqrst", 0, 1, "abcde", 0, 5, -4);
+    test("abcdefghijklmnopqrst", 0, 1, "abcde", 0, 6, -4);
+    test("abcdefghijklmnopqrst", 0, 1, "abcde", 1, 0, 1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcde", 1, 1, -1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcde", 1, 2, -1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcde", 1, 3, -1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcde", 1, 4, -1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcde", 1, 5, -1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcde", 2, 0, 1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcde", 2, 1, -2);
+    test("abcdefghijklmnopqrst", 0, 1, "abcde", 2, 2, -2);
+    test("abcdefghijklmnopqrst", 0, 1, "abcde", 2, 3, -2);
+    test("abcdefghijklmnopqrst", 0, 1, "abcde", 2, 4, -2);
+    test("abcdefghijklmnopqrst", 0, 1, "abcde", 4, 0, 1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcde", 4, 1, -4);
+    test("abcdefghijklmnopqrst", 0, 1, "abcde", 4, 2, -4);
+    test("abcdefghijklmnopqrst", 0, 1, "abcde", 5, 0, 1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcde", 5, 1, 1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcde", 6, 0, 0);
+}
+
+void test38()
+{
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", 0, 0, 1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", 0, 1, 0);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", 0, 5, -4);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", 0, 9, -8);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", 0, 10, -9);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", 0, 11, -9);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", 1, 0, 1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", 1, 1, -1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", 1, 4, -1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", 1, 8, -1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", 1, 9, -1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", 1, 10, -1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", 5, 0, 1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", 5, 1, -5);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", 5, 2, -5);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", 5, 4, -5);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", 5, 5, -5);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", 5, 6, -5);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", 9, 0, 1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", 9, 1, -9);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", 9, 2, -9);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", 10, 0, 1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", 10, 1, 1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghij", 11, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", 0, 0, 1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", 0, 1, 0);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", 0, 10, -9);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", 0, 19, -18);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", 0, 20, -19);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", 0, 21, -19);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", 1, 0, 1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", 1, 9, -1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", 1, 18, -1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", 1, 19, -1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", 1, 20, -1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", 10, 0, 1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", 10, 1, -10);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", 10, 5, -10);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", 10, 9, -10);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", 10, 11, -10);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", 19, 0, 1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", 19, 1, -19);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", 19, 2, -19);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", 20, 0, 1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", 20, 1, 1);
+    test("abcdefghijklmnopqrst", 0, 1, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 10, "", 0, 0, 10);
+    test("abcdefghijklmnopqrst", 0, 10, "", 0, 1, 10);
+    test("abcdefghijklmnopqrst", 0, 10, "", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 10, "abcde", 0, 0, 10);
+    test("abcdefghijklmnopqrst", 0, 10, "abcde", 0, 1, 9);
+    test("abcdefghijklmnopqrst", 0, 10, "abcde", 0, 2, 8);
+    test("abcdefghijklmnopqrst", 0, 10, "abcde", 0, 4, 6);
+    test("abcdefghijklmnopqrst", 0, 10, "abcde", 0, 5, 5);
+    test("abcdefghijklmnopqrst", 0, 10, "abcde", 0, 6, 5);
+    test("abcdefghijklmnopqrst", 0, 10, "abcde", 1, 0, 10);
+    test("abcdefghijklmnopqrst", 0, 10, "abcde", 1, 1, -1);
+    test("abcdefghijklmnopqrst", 0, 10, "abcde", 1, 2, -1);
+    test("abcdefghijklmnopqrst", 0, 10, "abcde", 1, 3, -1);
+    test("abcdefghijklmnopqrst", 0, 10, "abcde", 1, 4, -1);
+    test("abcdefghijklmnopqrst", 0, 10, "abcde", 1, 5, -1);
+    test("abcdefghijklmnopqrst", 0, 10, "abcde", 2, 0, 10);
+    test("abcdefghijklmnopqrst", 0, 10, "abcde", 2, 1, -2);
+    test("abcdefghijklmnopqrst", 0, 10, "abcde", 2, 2, -2);
+    test("abcdefghijklmnopqrst", 0, 10, "abcde", 2, 3, -2);
+    test("abcdefghijklmnopqrst", 0, 10, "abcde", 2, 4, -2);
+    test("abcdefghijklmnopqrst", 0, 10, "abcde", 4, 0, 10);
+    test("abcdefghijklmnopqrst", 0, 10, "abcde", 4, 1, -4);
+    test("abcdefghijklmnopqrst", 0, 10, "abcde", 4, 2, -4);
+    test("abcdefghijklmnopqrst", 0, 10, "abcde", 5, 0, 10);
+    test("abcdefghijklmnopqrst", 0, 10, "abcde", 5, 1, 10);
+    test("abcdefghijklmnopqrst", 0, 10, "abcde", 6, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 0, 0, 10);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 0, 1, 9);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 0, 5, 5);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 0, 9, 1);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 0, 10, 0);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 0, 11, 0);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 1, 0, 10);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 1, 1, -1);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 1, 4, -1);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 1, 8, -1);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 1, 9, -1);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 1, 10, -1);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 5, 0, 10);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 5, 1, -5);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 5, 2, -5);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 5, 4, -5);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 5, 5, -5);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 5, 6, -5);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 9, 0, 10);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 9, 1, -9);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 9, 2, -9);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 10, 0, 10);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 10, 1, 10);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghij", 11, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", 0, 0, 10);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", 0, 1, 9);
+}
+
+void test39()
+{
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", 0, 10, 0);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", 0, 19, -9);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", 0, 20, -10);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", 0, 21, -10);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", 1, 0, 10);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", 1, 9, -1);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", 1, 18, -1);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", 1, 19, -1);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", 1, 20, -1);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", 10, 0, 10);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", 10, 1, -10);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", 10, 5, -10);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", 10, 9, -10);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", 10, 11, -10);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", 19, 0, 10);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", 19, 1, -19);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", 19, 2, -19);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", 20, 0, 10);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", 20, 1, 10);
+    test("abcdefghijklmnopqrst", 0, 10, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 19, "", 0, 0, 19);
+    test("abcdefghijklmnopqrst", 0, 19, "", 0, 1, 19);
+    test("abcdefghijklmnopqrst", 0, 19, "", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 19, "abcde", 0, 0, 19);
+    test("abcdefghijklmnopqrst", 0, 19, "abcde", 0, 1, 18);
+    test("abcdefghijklmnopqrst", 0, 19, "abcde", 0, 2, 17);
+    test("abcdefghijklmnopqrst", 0, 19, "abcde", 0, 4, 15);
+    test("abcdefghijklmnopqrst", 0, 19, "abcde", 0, 5, 14);
+    test("abcdefghijklmnopqrst", 0, 19, "abcde", 0, 6, 14);
+    test("abcdefghijklmnopqrst", 0, 19, "abcde", 1, 0, 19);
+    test("abcdefghijklmnopqrst", 0, 19, "abcde", 1, 1, -1);
+    test("abcdefghijklmnopqrst", 0, 19, "abcde", 1, 2, -1);
+    test("abcdefghijklmnopqrst", 0, 19, "abcde", 1, 3, -1);
+    test("abcdefghijklmnopqrst", 0, 19, "abcde", 1, 4, -1);
+    test("abcdefghijklmnopqrst", 0, 19, "abcde", 1, 5, -1);
+    test("abcdefghijklmnopqrst", 0, 19, "abcde", 2, 0, 19);
+    test("abcdefghijklmnopqrst", 0, 19, "abcde", 2, 1, -2);
+    test("abcdefghijklmnopqrst", 0, 19, "abcde", 2, 2, -2);
+    test("abcdefghijklmnopqrst", 0, 19, "abcde", 2, 3, -2);
+    test("abcdefghijklmnopqrst", 0, 19, "abcde", 2, 4, -2);
+    test("abcdefghijklmnopqrst", 0, 19, "abcde", 4, 0, 19);
+    test("abcdefghijklmnopqrst", 0, 19, "abcde", 4, 1, -4);
+    test("abcdefghijklmnopqrst", 0, 19, "abcde", 4, 2, -4);
+    test("abcdefghijklmnopqrst", 0, 19, "abcde", 5, 0, 19);
+    test("abcdefghijklmnopqrst", 0, 19, "abcde", 5, 1, 19);
+    test("abcdefghijklmnopqrst", 0, 19, "abcde", 6, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 0, 0, 19);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 0, 1, 18);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 0, 5, 14);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 0, 9, 10);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 0, 10, 9);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 0, 11, 9);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 1, 0, 19);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 1, 1, -1);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 1, 4, -1);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 1, 8, -1);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 1, 9, -1);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 1, 10, -1);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 5, 0, 19);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 5, 1, -5);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 5, 2, -5);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 5, 4, -5);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 5, 5, -5);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 5, 6, -5);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 9, 0, 19);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 9, 1, -9);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 9, 2, -9);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 10, 0, 19);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 10, 1, 19);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghij", 11, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", 0, 0, 19);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", 0, 1, 18);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", 0, 10, 9);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", 0, 19, 0);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", 0, 20, -1);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", 0, 21, -1);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", 1, 0, 19);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", 1, 9, -1);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", 1, 18, -1);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", 1, 19, -1);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", 1, 20, -1);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", 10, 0, 19);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", 10, 1, -10);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", 10, 5, -10);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", 10, 9, -10);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", 10, 11, -10);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", 19, 0, 19);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", 19, 1, -19);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", 19, 2, -19);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", 20, 0, 19);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", 20, 1, 19);
+    test("abcdefghijklmnopqrst", 0, 19, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 20, "", 0, 0, 20);
+    test("abcdefghijklmnopqrst", 0, 20, "", 0, 1, 20);
+    test("abcdefghijklmnopqrst", 0, 20, "", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 20, "abcde", 0, 0, 20);
+}
+
+void test40()
+{
+    test("abcdefghijklmnopqrst", 0, 20, "abcde", 0, 1, 19);
+    test("abcdefghijklmnopqrst", 0, 20, "abcde", 0, 2, 18);
+    test("abcdefghijklmnopqrst", 0, 20, "abcde", 0, 4, 16);
+    test("abcdefghijklmnopqrst", 0, 20, "abcde", 0, 5, 15);
+    test("abcdefghijklmnopqrst", 0, 20, "abcde", 0, 6, 15);
+    test("abcdefghijklmnopqrst", 0, 20, "abcde", 1, 0, 20);
+    test("abcdefghijklmnopqrst", 0, 20, "abcde", 1, 1, -1);
+    test("abcdefghijklmnopqrst", 0, 20, "abcde", 1, 2, -1);
+    test("abcdefghijklmnopqrst", 0, 20, "abcde", 1, 3, -1);
+    test("abcdefghijklmnopqrst", 0, 20, "abcde", 1, 4, -1);
+    test("abcdefghijklmnopqrst", 0, 20, "abcde", 1, 5, -1);
+    test("abcdefghijklmnopqrst", 0, 20, "abcde", 2, 0, 20);
+    test("abcdefghijklmnopqrst", 0, 20, "abcde", 2, 1, -2);
+    test("abcdefghijklmnopqrst", 0, 20, "abcde", 2, 2, -2);
+    test("abcdefghijklmnopqrst", 0, 20, "abcde", 2, 3, -2);
+    test("abcdefghijklmnopqrst", 0, 20, "abcde", 2, 4, -2);
+    test("abcdefghijklmnopqrst", 0, 20, "abcde", 4, 0, 20);
+    test("abcdefghijklmnopqrst", 0, 20, "abcde", 4, 1, -4);
+    test("abcdefghijklmnopqrst", 0, 20, "abcde", 4, 2, -4);
+    test("abcdefghijklmnopqrst", 0, 20, "abcde", 5, 0, 20);
+    test("abcdefghijklmnopqrst", 0, 20, "abcde", 5, 1, 20);
+    test("abcdefghijklmnopqrst", 0, 20, "abcde", 6, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 0, 0, 20);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 0, 1, 19);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 0, 5, 15);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 0, 9, 11);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 0, 10, 10);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 0, 11, 10);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 1, 0, 20);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 1, 1, -1);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 1, 4, -1);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 1, 8, -1);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 1, 9, -1);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 1, 10, -1);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 5, 0, 20);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 5, 1, -5);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 5, 2, -5);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 5, 4, -5);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 5, 5, -5);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 5, 6, -5);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 9, 0, 20);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 9, 1, -9);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 9, 2, -9);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 10, 0, 20);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 10, 1, 20);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghij", 11, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 0, 0, 20);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 0, 1, 19);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 0, 10, 10);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 0, 19, 1);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 0, 20, 0);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 0, 21, 0);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 1, 0, 20);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 1, 9, -1);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 1, 18, -1);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 1, 19, -1);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 1, 20, -1);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 10, 0, 20);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 10, 1, -10);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 10, 5, -10);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 10, 9, -10);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 10, 11, -10);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 19, 0, 20);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 19, 1, -19);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 19, 2, -19);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 20, 0, 20);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 20, 1, 20);
+    test("abcdefghijklmnopqrst", 0, 20, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 21, "", 0, 0, 20);
+    test("abcdefghijklmnopqrst", 0, 21, "", 0, 1, 20);
+    test("abcdefghijklmnopqrst", 0, 21, "", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 21, "abcde", 0, 0, 20);
+    test("abcdefghijklmnopqrst", 0, 21, "abcde", 0, 1, 19);
+    test("abcdefghijklmnopqrst", 0, 21, "abcde", 0, 2, 18);
+    test("abcdefghijklmnopqrst", 0, 21, "abcde", 0, 4, 16);
+    test("abcdefghijklmnopqrst", 0, 21, "abcde", 0, 5, 15);
+    test("abcdefghijklmnopqrst", 0, 21, "abcde", 0, 6, 15);
+    test("abcdefghijklmnopqrst", 0, 21, "abcde", 1, 0, 20);
+    test("abcdefghijklmnopqrst", 0, 21, "abcde", 1, 1, -1);
+    test("abcdefghijklmnopqrst", 0, 21, "abcde", 1, 2, -1);
+    test("abcdefghijklmnopqrst", 0, 21, "abcde", 1, 3, -1);
+    test("abcdefghijklmnopqrst", 0, 21, "abcde", 1, 4, -1);
+    test("abcdefghijklmnopqrst", 0, 21, "abcde", 1, 5, -1);
+    test("abcdefghijklmnopqrst", 0, 21, "abcde", 2, 0, 20);
+    test("abcdefghijklmnopqrst", 0, 21, "abcde", 2, 1, -2);
+    test("abcdefghijklmnopqrst", 0, 21, "abcde", 2, 2, -2);
+    test("abcdefghijklmnopqrst", 0, 21, "abcde", 2, 3, -2);
+    test("abcdefghijklmnopqrst", 0, 21, "abcde", 2, 4, -2);
+    test("abcdefghijklmnopqrst", 0, 21, "abcde", 4, 0, 20);
+    test("abcdefghijklmnopqrst", 0, 21, "abcde", 4, 1, -4);
+    test("abcdefghijklmnopqrst", 0, 21, "abcde", 4, 2, -4);
+    test("abcdefghijklmnopqrst", 0, 21, "abcde", 5, 0, 20);
+    test("abcdefghijklmnopqrst", 0, 21, "abcde", 5, 1, 20);
+    test("abcdefghijklmnopqrst", 0, 21, "abcde", 6, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 0, 0, 20);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 0, 1, 19);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 0, 5, 15);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 0, 9, 11);
+}
+
+void test41()
+{
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 0, 10, 10);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 0, 11, 10);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 1, 0, 20);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 1, 1, -1);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 1, 4, -1);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 1, 8, -1);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 1, 9, -1);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 1, 10, -1);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 5, 0, 20);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 5, 1, -5);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 5, 2, -5);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 5, 4, -5);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 5, 5, -5);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 5, 6, -5);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 9, 0, 20);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 9, 1, -9);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 9, 2, -9);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 10, 0, 20);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 10, 1, 20);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghij", 11, 0, 0);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 0, 0, 20);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 0, 1, 19);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 0, 10, 10);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 0, 19, 1);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 0, 20, 0);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 0, 21, 0);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 1, 0, 20);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 1, 9, -1);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 1, 18, -1);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 1, 19, -1);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 1, 20, -1);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 10, 0, 20);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 10, 1, -10);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 10, 5, -10);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 10, 9, -10);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 10, 11, -10);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 19, 0, 20);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 19, 1, -19);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 19, 2, -19);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 20, 0, 20);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 20, 1, 20);
+    test("abcdefghijklmnopqrst", 0, 21, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 0, "", 0, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 0, "", 0, 1, 0);
+    test("abcdefghijklmnopqrst", 1, 0, "", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 0, "abcde", 0, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 0, "abcde", 0, 1, -1);
+    test("abcdefghijklmnopqrst", 1, 0, "abcde", 0, 2, -2);
+    test("abcdefghijklmnopqrst", 1, 0, "abcde", 0, 4, -4);
+    test("abcdefghijklmnopqrst", 1, 0, "abcde", 0, 5, -5);
+    test("abcdefghijklmnopqrst", 1, 0, "abcde", 0, 6, -5);
+    test("abcdefghijklmnopqrst", 1, 0, "abcde", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 0, "abcde", 1, 1, -1);
+    test("abcdefghijklmnopqrst", 1, 0, "abcde", 1, 2, -2);
+    test("abcdefghijklmnopqrst", 1, 0, "abcde", 1, 3, -3);
+    test("abcdefghijklmnopqrst", 1, 0, "abcde", 1, 4, -4);
+    test("abcdefghijklmnopqrst", 1, 0, "abcde", 1, 5, -4);
+    test("abcdefghijklmnopqrst", 1, 0, "abcde", 2, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 0, "abcde", 2, 1, -1);
+    test("abcdefghijklmnopqrst", 1, 0, "abcde", 2, 2, -2);
+    test("abcdefghijklmnopqrst", 1, 0, "abcde", 2, 3, -3);
+    test("abcdefghijklmnopqrst", 1, 0, "abcde", 2, 4, -3);
+    test("abcdefghijklmnopqrst", 1, 0, "abcde", 4, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 0, "abcde", 4, 1, -1);
+    test("abcdefghijklmnopqrst", 1, 0, "abcde", 4, 2, -1);
+    test("abcdefghijklmnopqrst", 1, 0, "abcde", 5, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 0, "abcde", 5, 1, 0);
+    test("abcdefghijklmnopqrst", 1, 0, "abcde", 6, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", 0, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", 0, 1, -1);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", 0, 5, -5);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", 0, 9, -9);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", 0, 10, -10);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", 0, 11, -10);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", 1, 1, -1);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", 1, 4, -4);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", 1, 8, -8);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", 1, 9, -9);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", 1, 10, -9);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", 5, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", 5, 1, -1);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", 5, 2, -2);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", 5, 4, -4);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", 5, 5, -5);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", 5, 6, -5);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", 9, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", 9, 1, -1);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", 9, 2, -1);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", 10, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", 10, 1, 0);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghij", 11, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", 0, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", 0, 1, -1);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", 0, 10, -10);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", 0, 19, -19);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", 0, 20, -20);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", 0, 21, -20);
+}
+
+void test42()
+{
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", 1, 9, -9);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", 1, 18, -18);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", 1, 19, -19);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", 1, 20, -19);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", 10, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", 10, 1, -1);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", 10, 5, -5);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", 10, 11, -10);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", 19, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", 19, 1, -1);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", 19, 2, -1);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", 20, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", 20, 1, 0);
+    test("abcdefghijklmnopqrst", 1, 0, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 1, "", 0, 0, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "", 0, 1, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 1, "abcde", 0, 0, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcde", 0, 1, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcde", 0, 2, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcde", 0, 4, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcde", 0, 5, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcde", 0, 6, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcde", 1, 0, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcde", 1, 1, 0);
+    test("abcdefghijklmnopqrst", 1, 1, "abcde", 1, 2, -1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcde", 1, 3, -2);
+    test("abcdefghijklmnopqrst", 1, 1, "abcde", 1, 4, -3);
+    test("abcdefghijklmnopqrst", 1, 1, "abcde", 1, 5, -3);
+    test("abcdefghijklmnopqrst", 1, 1, "abcde", 2, 0, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcde", 2, 1, -1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcde", 2, 2, -1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcde", 2, 3, -1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcde", 2, 4, -1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcde", 4, 0, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcde", 4, 1, -3);
+    test("abcdefghijklmnopqrst", 1, 1, "abcde", 4, 2, -3);
+    test("abcdefghijklmnopqrst", 1, 1, "abcde", 5, 0, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcde", 5, 1, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcde", 6, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 0, 0, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 0, 1, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 0, 5, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 0, 9, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 0, 10, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 0, 11, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 1, 0, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 1, 1, 0);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 1, 4, -3);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 1, 8, -7);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 1, 9, -8);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 1, 10, -8);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 5, 0, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 5, 1, -4);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 5, 2, -4);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 5, 4, -4);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 5, 5, -4);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 5, 6, -4);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 9, 0, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 9, 1, -8);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 9, 2, -8);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 10, 0, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 10, 1, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghij", 11, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 0, 0, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 0, 1, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 0, 10, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 0, 19, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 0, 20, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 0, 21, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 1, 0, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 1, 1, 0);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 1, 9, -8);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 1, 18, -17);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 1, 19, -18);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 1, 20, -18);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 10, 0, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 10, 1, -9);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 10, 5, -9);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 10, 10, -9);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 10, 11, -9);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 19, 0, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 19, 1, -18);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 19, 2, -18);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 20, 0, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 20, 1, 1);
+    test("abcdefghijklmnopqrst", 1, 1, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 9, "", 0, 0, 9);
+    test("abcdefghijklmnopqrst", 1, 9, "", 0, 1, 9);
+    test("abcdefghijklmnopqrst", 1, 9, "", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 9, "abcde", 0, 0, 9);
+    test("abcdefghijklmnopqrst", 1, 9, "abcde", 0, 1, 1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcde", 0, 2, 1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcde", 0, 4, 1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcde", 0, 5, 1);
+}
+
+void test43()
+{
+    test("abcdefghijklmnopqrst", 1, 9, "abcde", 0, 6, 1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcde", 1, 0, 9);
+    test("abcdefghijklmnopqrst", 1, 9, "abcde", 1, 1, 8);
+    test("abcdefghijklmnopqrst", 1, 9, "abcde", 1, 2, 7);
+    test("abcdefghijklmnopqrst", 1, 9, "abcde", 1, 3, 6);
+    test("abcdefghijklmnopqrst", 1, 9, "abcde", 1, 4, 5);
+    test("abcdefghijklmnopqrst", 1, 9, "abcde", 1, 5, 5);
+    test("abcdefghijklmnopqrst", 1, 9, "abcde", 2, 0, 9);
+    test("abcdefghijklmnopqrst", 1, 9, "abcde", 2, 1, -1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcde", 2, 2, -1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcde", 2, 3, -1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcde", 2, 4, -1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcde", 4, 0, 9);
+    test("abcdefghijklmnopqrst", 1, 9, "abcde", 4, 1, -3);
+    test("abcdefghijklmnopqrst", 1, 9, "abcde", 4, 2, -3);
+    test("abcdefghijklmnopqrst", 1, 9, "abcde", 5, 0, 9);
+    test("abcdefghijklmnopqrst", 1, 9, "abcde", 5, 1, 9);
+    test("abcdefghijklmnopqrst", 1, 9, "abcde", 6, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 0, 0, 9);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 0, 1, 1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 0, 5, 1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 0, 9, 1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 0, 10, 1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 0, 11, 1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 1, 0, 9);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 1, 1, 8);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 1, 4, 5);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 1, 8, 1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 1, 9, 0);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 1, 10, 0);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 5, 0, 9);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 5, 1, -4);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 5, 2, -4);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 5, 4, -4);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 5, 5, -4);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 5, 6, -4);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 9, 0, 9);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 9, 1, -8);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 9, 2, -8);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 10, 0, 9);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 10, 1, 9);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghij", 11, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 0, 0, 9);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 0, 1, 1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 0, 10, 1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 0, 19, 1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 0, 20, 1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 0, 21, 1);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 1, 0, 9);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 1, 1, 8);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 1, 9, 0);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 1, 18, -9);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 1, 19, -10);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 1, 20, -10);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 10, 0, 9);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 10, 1, -9);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 10, 5, -9);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 10, 10, -9);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 10, 11, -9);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 19, 0, 9);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 19, 1, -18);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 19, 2, -18);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 20, 0, 9);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 20, 1, 9);
+    test("abcdefghijklmnopqrst", 1, 9, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 18, "", 0, 0, 18);
+    test("abcdefghijklmnopqrst", 1, 18, "", 0, 1, 18);
+    test("abcdefghijklmnopqrst", 1, 18, "", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 18, "abcde", 0, 0, 18);
+    test("abcdefghijklmnopqrst", 1, 18, "abcde", 0, 1, 1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcde", 0, 2, 1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcde", 0, 4, 1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcde", 0, 5, 1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcde", 0, 6, 1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcde", 1, 0, 18);
+    test("abcdefghijklmnopqrst", 1, 18, "abcde", 1, 1, 17);
+    test("abcdefghijklmnopqrst", 1, 18, "abcde", 1, 2, 16);
+    test("abcdefghijklmnopqrst", 1, 18, "abcde", 1, 3, 15);
+    test("abcdefghijklmnopqrst", 1, 18, "abcde", 1, 4, 14);
+    test("abcdefghijklmnopqrst", 1, 18, "abcde", 1, 5, 14);
+    test("abcdefghijklmnopqrst", 1, 18, "abcde", 2, 0, 18);
+    test("abcdefghijklmnopqrst", 1, 18, "abcde", 2, 1, -1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcde", 2, 2, -1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcde", 2, 3, -1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcde", 2, 4, -1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcde", 4, 0, 18);
+    test("abcdefghijklmnopqrst", 1, 18, "abcde", 4, 1, -3);
+    test("abcdefghijklmnopqrst", 1, 18, "abcde", 4, 2, -3);
+    test("abcdefghijklmnopqrst", 1, 18, "abcde", 5, 0, 18);
+    test("abcdefghijklmnopqrst", 1, 18, "abcde", 5, 1, 18);
+    test("abcdefghijklmnopqrst", 1, 18, "abcde", 6, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 0, 0, 18);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 0, 1, 1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 0, 5, 1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 0, 9, 1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 0, 10, 1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 0, 11, 1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 1, 0, 18);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 1, 1, 17);
+}
+
+void test44()
+{
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 1, 4, 14);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 1, 8, 10);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 1, 9, 9);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 1, 10, 9);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 5, 0, 18);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 5, 1, -4);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 5, 2, -4);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 5, 4, -4);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 5, 5, -4);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 5, 6, -4);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 9, 0, 18);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 9, 1, -8);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 9, 2, -8);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 10, 0, 18);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 10, 1, 18);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghij", 11, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 0, 0, 18);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 0, 1, 1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 0, 10, 1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 0, 19, 1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 0, 20, 1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 0, 21, 1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 1, 0, 18);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 1, 1, 17);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 1, 9, 9);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 1, 18, 0);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 1, 19, -1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 1, 20, -1);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 10, 0, 18);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 10, 1, -9);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 10, 5, -9);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 10, 10, -9);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 10, 11, -9);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 19, 0, 18);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 19, 1, -18);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 19, 2, -18);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 20, 0, 18);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 20, 1, 18);
+    test("abcdefghijklmnopqrst", 1, 18, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 19, "", 0, 0, 19);
+    test("abcdefghijklmnopqrst", 1, 19, "", 0, 1, 19);
+    test("abcdefghijklmnopqrst", 1, 19, "", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 19, "abcde", 0, 0, 19);
+    test("abcdefghijklmnopqrst", 1, 19, "abcde", 0, 1, 1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcde", 0, 2, 1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcde", 0, 4, 1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcde", 0, 5, 1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcde", 0, 6, 1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcde", 1, 0, 19);
+    test("abcdefghijklmnopqrst", 1, 19, "abcde", 1, 1, 18);
+    test("abcdefghijklmnopqrst", 1, 19, "abcde", 1, 2, 17);
+    test("abcdefghijklmnopqrst", 1, 19, "abcde", 1, 3, 16);
+    test("abcdefghijklmnopqrst", 1, 19, "abcde", 1, 4, 15);
+    test("abcdefghijklmnopqrst", 1, 19, "abcde", 1, 5, 15);
+    test("abcdefghijklmnopqrst", 1, 19, "abcde", 2, 0, 19);
+    test("abcdefghijklmnopqrst", 1, 19, "abcde", 2, 1, -1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcde", 2, 2, -1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcde", 2, 3, -1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcde", 2, 4, -1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcde", 4, 0, 19);
+    test("abcdefghijklmnopqrst", 1, 19, "abcde", 4, 1, -3);
+    test("abcdefghijklmnopqrst", 1, 19, "abcde", 4, 2, -3);
+    test("abcdefghijklmnopqrst", 1, 19, "abcde", 5, 0, 19);
+    test("abcdefghijklmnopqrst", 1, 19, "abcde", 5, 1, 19);
+    test("abcdefghijklmnopqrst", 1, 19, "abcde", 6, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 0, 0, 19);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 0, 1, 1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 0, 5, 1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 0, 9, 1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 0, 10, 1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 0, 11, 1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 1, 0, 19);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 1, 1, 18);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 1, 4, 15);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 1, 8, 11);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 1, 9, 10);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 1, 10, 10);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 5, 0, 19);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 5, 1, -4);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 5, 2, -4);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 5, 4, -4);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 5, 5, -4);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 5, 6, -4);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 9, 0, 19);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 9, 1, -8);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 9, 2, -8);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 10, 0, 19);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 10, 1, 19);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghij", 11, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 0, 0, 19);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 0, 1, 1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 0, 10, 1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 0, 19, 1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 0, 20, 1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 0, 21, 1);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 1, 0, 19);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 1, 1, 18);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 1, 9, 10);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 1, 18, 1);
+}
+
+void test45()
+{
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 1, 19, 0);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 1, 20, 0);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 10, 0, 19);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 10, 1, -9);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 10, 5, -9);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 10, 10, -9);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 10, 11, -9);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 19, 0, 19);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 19, 1, -18);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 19, 2, -18);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 20, 0, 19);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 20, 1, 19);
+    test("abcdefghijklmnopqrst", 1, 19, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 20, "", 0, 0, 19);
+    test("abcdefghijklmnopqrst", 1, 20, "", 0, 1, 19);
+    test("abcdefghijklmnopqrst", 1, 20, "", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 20, "abcde", 0, 0, 19);
+    test("abcdefghijklmnopqrst", 1, 20, "abcde", 0, 1, 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcde", 0, 2, 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcde", 0, 4, 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcde", 0, 5, 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcde", 0, 6, 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcde", 1, 0, 19);
+    test("abcdefghijklmnopqrst", 1, 20, "abcde", 1, 1, 18);
+    test("abcdefghijklmnopqrst", 1, 20, "abcde", 1, 2, 17);
+    test("abcdefghijklmnopqrst", 1, 20, "abcde", 1, 3, 16);
+    test("abcdefghijklmnopqrst", 1, 20, "abcde", 1, 4, 15);
+    test("abcdefghijklmnopqrst", 1, 20, "abcde", 1, 5, 15);
+    test("abcdefghijklmnopqrst", 1, 20, "abcde", 2, 0, 19);
+    test("abcdefghijklmnopqrst", 1, 20, "abcde", 2, 1, -1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcde", 2, 2, -1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcde", 2, 3, -1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcde", 2, 4, -1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcde", 4, 0, 19);
+    test("abcdefghijklmnopqrst", 1, 20, "abcde", 4, 1, -3);
+    test("abcdefghijklmnopqrst", 1, 20, "abcde", 4, 2, -3);
+    test("abcdefghijklmnopqrst", 1, 20, "abcde", 5, 0, 19);
+    test("abcdefghijklmnopqrst", 1, 20, "abcde", 5, 1, 19);
+    test("abcdefghijklmnopqrst", 1, 20, "abcde", 6, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 0, 0, 19);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 0, 1, 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 0, 5, 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 0, 9, 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 0, 10, 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 0, 11, 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 1, 0, 19);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 1, 1, 18);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 1, 4, 15);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 1, 8, 11);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 1, 9, 10);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 1, 10, 10);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 5, 0, 19);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 5, 1, -4);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 5, 2, -4);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 5, 4, -4);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 5, 5, -4);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 5, 6, -4);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 9, 0, 19);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 9, 1, -8);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 9, 2, -8);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 10, 0, 19);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 10, 1, 19);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghij", 11, 0, 0);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 0, 0, 19);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 0, 1, 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 0, 10, 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 0, 19, 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 0, 20, 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 0, 21, 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 1, 0, 19);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 1, 1, 18);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 1, 9, 10);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 1, 18, 1);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 1, 19, 0);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 1, 20, 0);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 10, 0, 19);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 10, 1, -9);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 10, 5, -9);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 10, 10, -9);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 10, 11, -9);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 19, 0, 19);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 19, 1, -18);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 19, 2, -18);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 20, 0, 19);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 20, 1, 19);
+    test("abcdefghijklmnopqrst", 1, 20, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 0, "", 0, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 0, "", 0, 1, 0);
+    test("abcdefghijklmnopqrst", 10, 0, "", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 0, "abcde", 0, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 0, "abcde", 0, 1, -1);
+    test("abcdefghijklmnopqrst", 10, 0, "abcde", 0, 2, -2);
+    test("abcdefghijklmnopqrst", 10, 0, "abcde", 0, 4, -4);
+    test("abcdefghijklmnopqrst", 10, 0, "abcde", 0, 5, -5);
+    test("abcdefghijklmnopqrst", 10, 0, "abcde", 0, 6, -5);
+    test("abcdefghijklmnopqrst", 10, 0, "abcde", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 0, "abcde", 1, 1, -1);
+    test("abcdefghijklmnopqrst", 10, 0, "abcde", 1, 2, -2);
+}
+
+void test46()
+{
+    test("abcdefghijklmnopqrst", 10, 0, "abcde", 1, 3, -3);
+    test("abcdefghijklmnopqrst", 10, 0, "abcde", 1, 4, -4);
+    test("abcdefghijklmnopqrst", 10, 0, "abcde", 1, 5, -4);
+    test("abcdefghijklmnopqrst", 10, 0, "abcde", 2, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 0, "abcde", 2, 1, -1);
+    test("abcdefghijklmnopqrst", 10, 0, "abcde", 2, 2, -2);
+    test("abcdefghijklmnopqrst", 10, 0, "abcde", 2, 3, -3);
+    test("abcdefghijklmnopqrst", 10, 0, "abcde", 2, 4, -3);
+    test("abcdefghijklmnopqrst", 10, 0, "abcde", 4, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 0, "abcde", 4, 1, -1);
+    test("abcdefghijklmnopqrst", 10, 0, "abcde", 4, 2, -1);
+    test("abcdefghijklmnopqrst", 10, 0, "abcde", 5, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 0, "abcde", 5, 1, 0);
+    test("abcdefghijklmnopqrst", 10, 0, "abcde", 6, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", 0, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", 0, 1, -1);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", 0, 5, -5);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", 0, 9, -9);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", 0, 10, -10);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", 0, 11, -10);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", 1, 1, -1);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", 1, 4, -4);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", 1, 8, -8);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", 1, 9, -9);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", 1, 10, -9);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", 5, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", 5, 1, -1);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", 5, 2, -2);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", 5, 4, -4);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", 5, 5, -5);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", 5, 6, -5);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", 9, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", 9, 1, -1);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", 9, 2, -1);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", 10, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", 10, 1, 0);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghij", 11, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", 0, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", 0, 1, -1);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", 0, 10, -10);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", 0, 19, -19);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", 0, 20, -20);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", 0, 21, -20);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", 1, 9, -9);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", 1, 18, -18);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", 1, 19, -19);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", 1, 20, -19);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", 10, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", 10, 1, -1);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", 10, 5, -5);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", 10, 11, -10);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", 19, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", 19, 1, -1);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", 19, 2, -1);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", 20, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", 20, 1, 0);
+    test("abcdefghijklmnopqrst", 10, 0, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 1, "", 0, 0, 1);
+    test("abcdefghijklmnopqrst", 10, 1, "", 0, 1, 1);
+    test("abcdefghijklmnopqrst", 10, 1, "", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 1, "abcde", 0, 0, 1);
+    test("abcdefghijklmnopqrst", 10, 1, "abcde", 0, 1, 10);
+    test("abcdefghijklmnopqrst", 10, 1, "abcde", 0, 2, 10);
+    test("abcdefghijklmnopqrst", 10, 1, "abcde", 0, 4, 10);
+    test("abcdefghijklmnopqrst", 10, 1, "abcde", 0, 5, 10);
+    test("abcdefghijklmnopqrst", 10, 1, "abcde", 0, 6, 10);
+    test("abcdefghijklmnopqrst", 10, 1, "abcde", 1, 0, 1);
+    test("abcdefghijklmnopqrst", 10, 1, "abcde", 1, 1, 9);
+    test("abcdefghijklmnopqrst", 10, 1, "abcde", 1, 2, 9);
+    test("abcdefghijklmnopqrst", 10, 1, "abcde", 1, 3, 9);
+    test("abcdefghijklmnopqrst", 10, 1, "abcde", 1, 4, 9);
+    test("abcdefghijklmnopqrst", 10, 1, "abcde", 1, 5, 9);
+    test("abcdefghijklmnopqrst", 10, 1, "abcde", 2, 0, 1);
+    test("abcdefghijklmnopqrst", 10, 1, "abcde", 2, 1, 8);
+    test("abcdefghijklmnopqrst", 10, 1, "abcde", 2, 2, 8);
+    test("abcdefghijklmnopqrst", 10, 1, "abcde", 2, 3, 8);
+    test("abcdefghijklmnopqrst", 10, 1, "abcde", 2, 4, 8);
+    test("abcdefghijklmnopqrst", 10, 1, "abcde", 4, 0, 1);
+    test("abcdefghijklmnopqrst", 10, 1, "abcde", 4, 1, 6);
+    test("abcdefghijklmnopqrst", 10, 1, "abcde", 4, 2, 6);
+    test("abcdefghijklmnopqrst", 10, 1, "abcde", 5, 0, 1);
+    test("abcdefghijklmnopqrst", 10, 1, "abcde", 5, 1, 1);
+    test("abcdefghijklmnopqrst", 10, 1, "abcde", 6, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 0, 0, 1);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 0, 1, 10);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 0, 5, 10);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 0, 9, 10);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 0, 10, 10);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 0, 11, 10);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 1, 0, 1);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 1, 1, 9);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 1, 4, 9);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 1, 8, 9);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 1, 9, 9);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 1, 10, 9);
+}
+
+void test47()
+{
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 5, 0, 1);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 5, 1, 5);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 5, 2, 5);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 5, 4, 5);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 5, 5, 5);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 5, 6, 5);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 9, 0, 1);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 9, 1, 1);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 9, 2, 1);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 10, 0, 1);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 10, 1, 1);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghij", 11, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 0, 0, 1);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 0, 1, 10);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 0, 10, 10);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 0, 19, 10);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 0, 20, 10);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 0, 21, 10);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 1, 0, 1);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 1, 1, 9);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 1, 9, 9);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 1, 18, 9);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 1, 19, 9);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 1, 20, 9);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 10, 0, 1);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 10, 1, 0);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 10, 5, -4);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 10, 9, -8);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 10, 10, -9);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 10, 11, -9);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 19, 0, 1);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 19, 1, -9);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 19, 2, -9);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 20, 0, 1);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 20, 1, 1);
+    test("abcdefghijklmnopqrst", 10, 1, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 5, "", 0, 0, 5);
+    test("abcdefghijklmnopqrst", 10, 5, "", 0, 1, 5);
+    test("abcdefghijklmnopqrst", 10, 5, "", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 5, "abcde", 0, 0, 5);
+    test("abcdefghijklmnopqrst", 10, 5, "abcde", 0, 1, 10);
+    test("abcdefghijklmnopqrst", 10, 5, "abcde", 0, 2, 10);
+    test("abcdefghijklmnopqrst", 10, 5, "abcde", 0, 4, 10);
+    test("abcdefghijklmnopqrst", 10, 5, "abcde", 0, 5, 10);
+    test("abcdefghijklmnopqrst", 10, 5, "abcde", 0, 6, 10);
+    test("abcdefghijklmnopqrst", 10, 5, "abcde", 1, 0, 5);
+    test("abcdefghijklmnopqrst", 10, 5, "abcde", 1, 1, 9);
+    test("abcdefghijklmnopqrst", 10, 5, "abcde", 1, 2, 9);
+    test("abcdefghijklmnopqrst", 10, 5, "abcde", 1, 3, 9);
+    test("abcdefghijklmnopqrst", 10, 5, "abcde", 1, 4, 9);
+    test("abcdefghijklmnopqrst", 10, 5, "abcde", 1, 5, 9);
+    test("abcdefghijklmnopqrst", 10, 5, "abcde", 2, 0, 5);
+    test("abcdefghijklmnopqrst", 10, 5, "abcde", 2, 1, 8);
+    test("abcdefghijklmnopqrst", 10, 5, "abcde", 2, 2, 8);
+    test("abcdefghijklmnopqrst", 10, 5, "abcde", 2, 3, 8);
+    test("abcdefghijklmnopqrst", 10, 5, "abcde", 2, 4, 8);
+    test("abcdefghijklmnopqrst", 10, 5, "abcde", 4, 0, 5);
+    test("abcdefghijklmnopqrst", 10, 5, "abcde", 4, 1, 6);
+    test("abcdefghijklmnopqrst", 10, 5, "abcde", 4, 2, 6);
+    test("abcdefghijklmnopqrst", 10, 5, "abcde", 5, 0, 5);
+    test("abcdefghijklmnopqrst", 10, 5, "abcde", 5, 1, 5);
+    test("abcdefghijklmnopqrst", 10, 5, "abcde", 6, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 0, 0, 5);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 0, 1, 10);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 0, 5, 10);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 0, 9, 10);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 0, 10, 10);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 0, 11, 10);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 1, 0, 5);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 1, 1, 9);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 1, 4, 9);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 1, 8, 9);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 1, 9, 9);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 1, 10, 9);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 5, 0, 5);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 5, 1, 5);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 5, 2, 5);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 5, 4, 5);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 5, 5, 5);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 5, 6, 5);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 9, 0, 5);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 9, 1, 1);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 9, 2, 1);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 10, 0, 5);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 10, 1, 5);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghij", 11, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 0, 0, 5);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 0, 1, 10);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 0, 10, 10);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 0, 19, 10);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 0, 20, 10);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 0, 21, 10);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 1, 0, 5);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 1, 1, 9);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 1, 9, 9);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 1, 18, 9);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 1, 19, 9);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 1, 20, 9);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 10, 0, 5);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 10, 1, 4);
+}
+
+void test48()
+{
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 10, 5, 0);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 10, 9, -4);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 10, 10, -5);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 10, 11, -5);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 19, 0, 5);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 19, 1, -9);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 19, 2, -9);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 20, 0, 5);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 20, 1, 5);
+    test("abcdefghijklmnopqrst", 10, 5, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 9, "", 0, 0, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "", 0, 1, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 9, "abcde", 0, 0, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcde", 0, 1, 10);
+    test("abcdefghijklmnopqrst", 10, 9, "abcde", 0, 2, 10);
+    test("abcdefghijklmnopqrst", 10, 9, "abcde", 0, 4, 10);
+    test("abcdefghijklmnopqrst", 10, 9, "abcde", 0, 5, 10);
+    test("abcdefghijklmnopqrst", 10, 9, "abcde", 0, 6, 10);
+    test("abcdefghijklmnopqrst", 10, 9, "abcde", 1, 0, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcde", 1, 1, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcde", 1, 2, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcde", 1, 3, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcde", 1, 4, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcde", 1, 5, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcde", 2, 0, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcde", 2, 1, 8);
+    test("abcdefghijklmnopqrst", 10, 9, "abcde", 2, 2, 8);
+    test("abcdefghijklmnopqrst", 10, 9, "abcde", 2, 3, 8);
+    test("abcdefghijklmnopqrst", 10, 9, "abcde", 2, 4, 8);
+    test("abcdefghijklmnopqrst", 10, 9, "abcde", 4, 0, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcde", 4, 1, 6);
+    test("abcdefghijklmnopqrst", 10, 9, "abcde", 4, 2, 6);
+    test("abcdefghijklmnopqrst", 10, 9, "abcde", 5, 0, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcde", 5, 1, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcde", 6, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 0, 0, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 0, 1, 10);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 0, 5, 10);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 0, 9, 10);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 0, 10, 10);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 0, 11, 10);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 1, 0, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 1, 1, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 1, 4, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 1, 8, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 1, 9, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 1, 10, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 5, 0, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 5, 1, 5);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 5, 2, 5);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 5, 4, 5);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 5, 5, 5);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 5, 6, 5);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 9, 0, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 9, 1, 1);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 9, 2, 1);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 10, 0, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 10, 1, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghij", 11, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 0, 0, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 0, 1, 10);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 0, 10, 10);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 0, 19, 10);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 0, 20, 10);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 0, 21, 10);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 1, 0, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 1, 1, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 1, 9, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 1, 18, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 1, 19, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 1, 20, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 10, 0, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 10, 1, 8);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 10, 5, 4);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 10, 9, 0);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 10, 10, -1);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 10, 11, -1);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 19, 0, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 19, 1, -9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 19, 2, -9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 20, 0, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 20, 1, 9);
+    test("abcdefghijklmnopqrst", 10, 9, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 10, "", 0, 0, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "", 0, 1, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 10, "abcde", 0, 0, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcde", 0, 1, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcde", 0, 2, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcde", 0, 4, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcde", 0, 5, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcde", 0, 6, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcde", 1, 0, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcde", 1, 1, 9);
+    test("abcdefghijklmnopqrst", 10, 10, "abcde", 1, 2, 9);
+    test("abcdefghijklmnopqrst", 10, 10, "abcde", 1, 3, 9);
+    test("abcdefghijklmnopqrst", 10, 10, "abcde", 1, 4, 9);
+    test("abcdefghijklmnopqrst", 10, 10, "abcde", 1, 5, 9);
+    test("abcdefghijklmnopqrst", 10, 10, "abcde", 2, 0, 10);
+}
+
+void test49()
+{
+    test("abcdefghijklmnopqrst", 10, 10, "abcde", 2, 1, 8);
+    test("abcdefghijklmnopqrst", 10, 10, "abcde", 2, 2, 8);
+    test("abcdefghijklmnopqrst", 10, 10, "abcde", 2, 3, 8);
+    test("abcdefghijklmnopqrst", 10, 10, "abcde", 2, 4, 8);
+    test("abcdefghijklmnopqrst", 10, 10, "abcde", 4, 0, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcde", 4, 1, 6);
+    test("abcdefghijklmnopqrst", 10, 10, "abcde", 4, 2, 6);
+    test("abcdefghijklmnopqrst", 10, 10, "abcde", 5, 0, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcde", 5, 1, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcde", 6, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 0, 0, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 0, 1, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 0, 5, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 0, 9, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 0, 10, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 0, 11, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 1, 0, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 1, 1, 9);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 1, 4, 9);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 1, 8, 9);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 1, 9, 9);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 1, 10, 9);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 5, 0, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 5, 1, 5);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 5, 2, 5);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 5, 4, 5);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 5, 5, 5);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 5, 6, 5);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 9, 0, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 9, 1, 1);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 9, 2, 1);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 10, 0, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 10, 1, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghij", 11, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 0, 0, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 0, 1, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 0, 10, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 0, 19, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 0, 20, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 0, 21, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 1, 0, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 1, 1, 9);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 1, 9, 9);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 1, 18, 9);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 1, 19, 9);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 1, 20, 9);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 10, 0, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 10, 1, 9);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 10, 5, 5);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 10, 9, 1);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 10, 10, 0);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 10, 11, 0);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 19, 0, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 19, 1, -9);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 19, 2, -9);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 20, 0, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 20, 1, 10);
+    test("abcdefghijklmnopqrst", 10, 10, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 11, "", 0, 0, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "", 0, 1, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 11, "abcde", 0, 0, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcde", 0, 1, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcde", 0, 2, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcde", 0, 4, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcde", 0, 5, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcde", 0, 6, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcde", 1, 0, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcde", 1, 1, 9);
+    test("abcdefghijklmnopqrst", 10, 11, "abcde", 1, 2, 9);
+    test("abcdefghijklmnopqrst", 10, 11, "abcde", 1, 3, 9);
+    test("abcdefghijklmnopqrst", 10, 11, "abcde", 1, 4, 9);
+    test("abcdefghijklmnopqrst", 10, 11, "abcde", 1, 5, 9);
+    test("abcdefghijklmnopqrst", 10, 11, "abcde", 2, 0, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcde", 2, 1, 8);
+    test("abcdefghijklmnopqrst", 10, 11, "abcde", 2, 2, 8);
+    test("abcdefghijklmnopqrst", 10, 11, "abcde", 2, 3, 8);
+    test("abcdefghijklmnopqrst", 10, 11, "abcde", 2, 4, 8);
+    test("abcdefghijklmnopqrst", 10, 11, "abcde", 4, 0, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcde", 4, 1, 6);
+    test("abcdefghijklmnopqrst", 10, 11, "abcde", 4, 2, 6);
+    test("abcdefghijklmnopqrst", 10, 11, "abcde", 5, 0, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcde", 5, 1, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcde", 6, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 0, 0, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 0, 1, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 0, 5, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 0, 9, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 0, 10, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 0, 11, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 1, 0, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 1, 1, 9);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 1, 4, 9);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 1, 8, 9);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 1, 9, 9);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 1, 10, 9);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 5, 0, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 5, 1, 5);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 5, 2, 5);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 5, 4, 5);
+}
+
+void test50()
+{
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 5, 5, 5);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 5, 6, 5);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 9, 0, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 9, 1, 1);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 9, 2, 1);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 10, 0, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 10, 1, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghij", 11, 0, 0);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 0, 0, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 0, 1, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 0, 10, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 0, 19, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 0, 20, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 0, 21, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 1, 0, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 1, 1, 9);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 1, 9, 9);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 1, 18, 9);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 1, 19, 9);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 1, 20, 9);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 10, 0, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 10, 1, 9);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 10, 5, 5);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 10, 9, 1);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 10, 10, 0);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 10, 11, 0);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 19, 0, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 19, 1, -9);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 19, 2, -9);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 20, 0, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 20, 1, 10);
+    test("abcdefghijklmnopqrst", 10, 11, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghijklmnopqrst", 19, 0, "", 0, 0, 0);
+    test("abcdefghijklmnopqrst", 19, 0, "", 0, 1, 0);
+    test("abcdefghijklmnopqrst", 19, 0, "", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 19, 0, "abcde", 0, 0, 0);
+    test("abcdefghijklmnopqrst", 19, 0, "abcde", 0, 1, -1);
+    test("abcdefghijklmnopqrst", 19, 0, "abcde", 0, 2, -2);
+    test("abcdefghijklmnopqrst", 19, 0, "abcde", 0, 4, -4);
+    test("abcdefghijklmnopqrst", 19, 0, "abcde", 0, 5, -5);
+    test("abcdefghijklmnopqrst", 19, 0, "abcde", 0, 6, -5);
+    test("abcdefghijklmnopqrst", 19, 0, "abcde", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 19, 0, "abcde", 1, 1, -1);
+    test("abcdefghijklmnopqrst", 19, 0, "abcde", 1, 2, -2);
+    test("abcdefghijklmnopqrst", 19, 0, "abcde", 1, 3, -3);
+    test("abcdefghijklmnopqrst", 19, 0, "abcde", 1, 4, -4);
+    test("abcdefghijklmnopqrst", 19, 0, "abcde", 1, 5, -4);
+    test("abcdefghijklmnopqrst", 19, 0, "abcde", 2, 0, 0);
+    test("abcdefghijklmnopqrst", 19, 0, "abcde", 2, 1, -1);
+    test("abcdefghijklmnopqrst", 19, 0, "abcde", 2, 2, -2);
+    test("abcdefghijklmnopqrst", 19, 0, "abcde", 2, 3, -3);
+    test("abcdefghijklmnopqrst", 19, 0, "abcde", 2, 4, -3);
+    test("abcdefghijklmnopqrst", 19, 0, "abcde", 4, 0, 0);
+    test("abcdefghijklmnopqrst", 19, 0, "abcde", 4, 1, -1);
+    test("abcdefghijklmnopqrst", 19, 0, "abcde", 4, 2, -1);
+    test("abcdefghijklmnopqrst", 19, 0, "abcde", 5, 0, 0);
+    test("abcdefghijklmnopqrst", 19, 0, "abcde", 5, 1, 0);
+    test("abcdefghijklmnopqrst", 19, 0, "abcde", 6, 0, 0);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", 0, 0, 0);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", 0, 1, -1);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", 0, 5, -5);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", 0, 9, -9);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", 0, 10, -10);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", 0, 11, -10);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", 1, 1, -1);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", 1, 4, -4);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", 1, 8, -8);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", 1, 9, -9);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", 1, 10, -9);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", 5, 0, 0);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", 5, 1, -1);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", 5, 2, -2);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", 5, 4, -4);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", 5, 5, -5);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", 5, 6, -5);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", 9, 0, 0);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", 9, 1, -1);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", 9, 2, -1);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", 10, 0, 0);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", 10, 1, 0);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghij", 11, 0, 0);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", 0, 0, 0);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", 0, 1, -1);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", 0, 10, -10);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", 0, 19, -19);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", 0, 20, -20);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", 0, 21, -20);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", 1, 9, -9);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", 1, 18, -18);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", 1, 19, -19);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", 1, 20, -19);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", 10, 0, 0);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", 10, 1, -1);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", 10, 5, -5);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", 10, 11, -10);
+}
+
+void test51()
+{
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", 19, 0, 0);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", 19, 1, -1);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", 19, 2, -1);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", 20, 0, 0);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", 20, 1, 0);
+    test("abcdefghijklmnopqrst", 19, 0, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghijklmnopqrst", 19, 1, "", 0, 0, 1);
+    test("abcdefghijklmnopqrst", 19, 1, "", 0, 1, 1);
+    test("abcdefghijklmnopqrst", 19, 1, "", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 19, 1, "abcde", 0, 0, 1);
+    test("abcdefghijklmnopqrst", 19, 1, "abcde", 0, 1, 19);
+    test("abcdefghijklmnopqrst", 19, 1, "abcde", 0, 2, 19);
+    test("abcdefghijklmnopqrst", 19, 1, "abcde", 0, 4, 19);
+    test("abcdefghijklmnopqrst", 19, 1, "abcde", 0, 5, 19);
+    test("abcdefghijklmnopqrst", 19, 1, "abcde", 0, 6, 19);
+    test("abcdefghijklmnopqrst", 19, 1, "abcde", 1, 0, 1);
+    test("abcdefghijklmnopqrst", 19, 1, "abcde", 1, 1, 18);
+    test("abcdefghijklmnopqrst", 19, 1, "abcde", 1, 2, 18);
+    test("abcdefghijklmnopqrst", 19, 1, "abcde", 1, 3, 18);
+    test("abcdefghijklmnopqrst", 19, 1, "abcde", 1, 4, 18);
+    test("abcdefghijklmnopqrst", 19, 1, "abcde", 1, 5, 18);
+    test("abcdefghijklmnopqrst", 19, 1, "abcde", 2, 0, 1);
+    test("abcdefghijklmnopqrst", 19, 1, "abcde", 2, 1, 17);
+    test("abcdefghijklmnopqrst", 19, 1, "abcde", 2, 2, 17);
+    test("abcdefghijklmnopqrst", 19, 1, "abcde", 2, 3, 17);
+    test("abcdefghijklmnopqrst", 19, 1, "abcde", 2, 4, 17);
+    test("abcdefghijklmnopqrst", 19, 1, "abcde", 4, 0, 1);
+    test("abcdefghijklmnopqrst", 19, 1, "abcde", 4, 1, 15);
+    test("abcdefghijklmnopqrst", 19, 1, "abcde", 4, 2, 15);
+    test("abcdefghijklmnopqrst", 19, 1, "abcde", 5, 0, 1);
+    test("abcdefghijklmnopqrst", 19, 1, "abcde", 5, 1, 1);
+    test("abcdefghijklmnopqrst", 19, 1, "abcde", 6, 0, 0);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 0, 0, 1);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 0, 1, 19);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 0, 5, 19);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 0, 9, 19);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 0, 10, 19);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 0, 11, 19);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 1, 0, 1);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 1, 1, 18);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 1, 4, 18);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 1, 8, 18);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 1, 9, 18);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 1, 10, 18);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 5, 0, 1);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 5, 1, 14);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 5, 2, 14);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 5, 4, 14);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 5, 5, 14);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 5, 6, 14);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 9, 0, 1);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 9, 1, 10);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 9, 2, 10);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 10, 0, 1);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 10, 1, 1);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghij", 11, 0, 0);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 0, 0, 1);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 0, 1, 19);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 0, 10, 19);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 0, 19, 19);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 0, 20, 19);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 0, 21, 19);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 1, 0, 1);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 1, 1, 18);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 1, 9, 18);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 1, 18, 18);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 1, 19, 18);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 1, 20, 18);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 10, 0, 1);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 10, 1, 9);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 10, 5, 9);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 10, 9, 9);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 10, 10, 9);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 10, 11, 9);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 19, 0, 1);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 19, 1, 0);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 19, 2, 0);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 20, 0, 1);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 20, 1, 1);
+    test("abcdefghijklmnopqrst", 19, 1, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghijklmnopqrst", 19, 2, "", 0, 0, 1);
+    test("abcdefghijklmnopqrst", 19, 2, "", 0, 1, 1);
+    test("abcdefghijklmnopqrst", 19, 2, "", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 19, 2, "abcde", 0, 0, 1);
+    test("abcdefghijklmnopqrst", 19, 2, "abcde", 0, 1, 19);
+    test("abcdefghijklmnopqrst", 19, 2, "abcde", 0, 2, 19);
+    test("abcdefghijklmnopqrst", 19, 2, "abcde", 0, 4, 19);
+    test("abcdefghijklmnopqrst", 19, 2, "abcde", 0, 5, 19);
+    test("abcdefghijklmnopqrst", 19, 2, "abcde", 0, 6, 19);
+    test("abcdefghijklmnopqrst", 19, 2, "abcde", 1, 0, 1);
+    test("abcdefghijklmnopqrst", 19, 2, "abcde", 1, 1, 18);
+    test("abcdefghijklmnopqrst", 19, 2, "abcde", 1, 2, 18);
+    test("abcdefghijklmnopqrst", 19, 2, "abcde", 1, 3, 18);
+    test("abcdefghijklmnopqrst", 19, 2, "abcde", 1, 4, 18);
+    test("abcdefghijklmnopqrst", 19, 2, "abcde", 1, 5, 18);
+    test("abcdefghijklmnopqrst", 19, 2, "abcde", 2, 0, 1);
+    test("abcdefghijklmnopqrst", 19, 2, "abcde", 2, 1, 17);
+    test("abcdefghijklmnopqrst", 19, 2, "abcde", 2, 2, 17);
+    test("abcdefghijklmnopqrst", 19, 2, "abcde", 2, 3, 17);
+    test("abcdefghijklmnopqrst", 19, 2, "abcde", 2, 4, 17);
+}
+
+void test52()
+{
+    test("abcdefghijklmnopqrst", 19, 2, "abcde", 4, 0, 1);
+    test("abcdefghijklmnopqrst", 19, 2, "abcde", 4, 1, 15);
+    test("abcdefghijklmnopqrst", 19, 2, "abcde", 4, 2, 15);
+    test("abcdefghijklmnopqrst", 19, 2, "abcde", 5, 0, 1);
+    test("abcdefghijklmnopqrst", 19, 2, "abcde", 5, 1, 1);
+    test("abcdefghijklmnopqrst", 19, 2, "abcde", 6, 0, 0);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 0, 0, 1);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 0, 1, 19);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 0, 5, 19);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 0, 9, 19);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 0, 10, 19);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 0, 11, 19);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 1, 0, 1);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 1, 1, 18);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 1, 4, 18);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 1, 8, 18);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 1, 9, 18);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 1, 10, 18);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 5, 0, 1);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 5, 1, 14);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 5, 2, 14);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 5, 4, 14);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 5, 5, 14);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 5, 6, 14);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 9, 0, 1);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 9, 1, 10);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 9, 2, 10);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 10, 0, 1);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 10, 1, 1);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghij", 11, 0, 0);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 0, 0, 1);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 0, 1, 19);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 0, 10, 19);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 0, 19, 19);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 0, 20, 19);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 0, 21, 19);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 1, 0, 1);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 1, 1, 18);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 1, 9, 18);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 1, 18, 18);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 1, 19, 18);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 1, 20, 18);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 10, 0, 1);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 10, 1, 9);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 10, 5, 9);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 10, 9, 9);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 10, 10, 9);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 10, 11, 9);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 19, 0, 1);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 19, 1, 0);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 19, 2, 0);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 20, 0, 1);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 20, 1, 1);
+    test("abcdefghijklmnopqrst", 19, 2, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 0, "", 0, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 0, "", 0, 1, 0);
+    test("abcdefghijklmnopqrst", 20, 0, "", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 0, "abcde", 0, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 0, "abcde", 0, 1, -1);
+    test("abcdefghijklmnopqrst", 20, 0, "abcde", 0, 2, -2);
+    test("abcdefghijklmnopqrst", 20, 0, "abcde", 0, 4, -4);
+    test("abcdefghijklmnopqrst", 20, 0, "abcde", 0, 5, -5);
+    test("abcdefghijklmnopqrst", 20, 0, "abcde", 0, 6, -5);
+    test("abcdefghijklmnopqrst", 20, 0, "abcde", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 0, "abcde", 1, 1, -1);
+    test("abcdefghijklmnopqrst", 20, 0, "abcde", 1, 2, -2);
+    test("abcdefghijklmnopqrst", 20, 0, "abcde", 1, 3, -3);
+    test("abcdefghijklmnopqrst", 20, 0, "abcde", 1, 4, -4);
+    test("abcdefghijklmnopqrst", 20, 0, "abcde", 1, 5, -4);
+    test("abcdefghijklmnopqrst", 20, 0, "abcde", 2, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 0, "abcde", 2, 1, -1);
+    test("abcdefghijklmnopqrst", 20, 0, "abcde", 2, 2, -2);
+    test("abcdefghijklmnopqrst", 20, 0, "abcde", 2, 3, -3);
+    test("abcdefghijklmnopqrst", 20, 0, "abcde", 2, 4, -3);
+    test("abcdefghijklmnopqrst", 20, 0, "abcde", 4, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 0, "abcde", 4, 1, -1);
+    test("abcdefghijklmnopqrst", 20, 0, "abcde", 4, 2, -1);
+    test("abcdefghijklmnopqrst", 20, 0, "abcde", 5, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 0, "abcde", 5, 1, 0);
+    test("abcdefghijklmnopqrst", 20, 0, "abcde", 6, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", 0, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", 0, 1, -1);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", 0, 5, -5);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", 0, 9, -9);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", 0, 10, -10);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", 0, 11, -10);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", 1, 1, -1);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", 1, 4, -4);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", 1, 8, -8);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", 1, 9, -9);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", 1, 10, -9);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", 5, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", 5, 1, -1);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", 5, 2, -2);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", 5, 4, -4);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", 5, 5, -5);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", 5, 6, -5);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", 9, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", 9, 1, -1);
+}
+
+void test53()
+{
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", 9, 2, -1);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", 10, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", 10, 1, 0);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghij", 11, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", 0, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", 0, 1, -1);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", 0, 10, -10);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", 0, 19, -19);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", 0, 20, -20);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", 0, 21, -20);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", 1, 9, -9);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", 1, 18, -18);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", 1, 19, -19);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", 1, 20, -19);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", 10, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", 10, 1, -1);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", 10, 5, -5);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", 10, 11, -10);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", 19, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", 19, 1, -1);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", 19, 2, -1);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", 20, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", 20, 1, 0);
+    test("abcdefghijklmnopqrst", 20, 0, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 1, "", 0, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 1, "", 0, 1, 0);
+    test("abcdefghijklmnopqrst", 20, 1, "", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 1, "abcde", 0, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 1, "abcde", 0, 1, -1);
+    test("abcdefghijklmnopqrst", 20, 1, "abcde", 0, 2, -2);
+    test("abcdefghijklmnopqrst", 20, 1, "abcde", 0, 4, -4);
+    test("abcdefghijklmnopqrst", 20, 1, "abcde", 0, 5, -5);
+    test("abcdefghijklmnopqrst", 20, 1, "abcde", 0, 6, -5);
+    test("abcdefghijklmnopqrst", 20, 1, "abcde", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 1, "abcde", 1, 1, -1);
+    test("abcdefghijklmnopqrst", 20, 1, "abcde", 1, 2, -2);
+    test("abcdefghijklmnopqrst", 20, 1, "abcde", 1, 3, -3);
+    test("abcdefghijklmnopqrst", 20, 1, "abcde", 1, 4, -4);
+    test("abcdefghijklmnopqrst", 20, 1, "abcde", 1, 5, -4);
+    test("abcdefghijklmnopqrst", 20, 1, "abcde", 2, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 1, "abcde", 2, 1, -1);
+    test("abcdefghijklmnopqrst", 20, 1, "abcde", 2, 2, -2);
+    test("abcdefghijklmnopqrst", 20, 1, "abcde", 2, 3, -3);
+    test("abcdefghijklmnopqrst", 20, 1, "abcde", 2, 4, -3);
+    test("abcdefghijklmnopqrst", 20, 1, "abcde", 4, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 1, "abcde", 4, 1, -1);
+    test("abcdefghijklmnopqrst", 20, 1, "abcde", 4, 2, -1);
+    test("abcdefghijklmnopqrst", 20, 1, "abcde", 5, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 1, "abcde", 5, 1, 0);
+    test("abcdefghijklmnopqrst", 20, 1, "abcde", 6, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", 0, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", 0, 1, -1);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", 0, 5, -5);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", 0, 9, -9);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", 0, 10, -10);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", 0, 11, -10);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", 1, 1, -1);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", 1, 4, -4);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", 1, 8, -8);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", 1, 9, -9);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", 1, 10, -9);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", 5, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", 5, 1, -1);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", 5, 2, -2);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", 5, 4, -4);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", 5, 5, -5);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", 5, 6, -5);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", 9, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", 9, 1, -1);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", 9, 2, -1);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", 10, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", 10, 1, 0);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghij", 11, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", 0, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", 0, 1, -1);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", 0, 10, -10);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", 0, 19, -19);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", 0, 20, -20);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", 0, 21, -20);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", 1, 1, -1);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", 1, 9, -9);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", 1, 18, -18);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", 1, 19, -19);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", 1, 20, -19);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", 10, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", 10, 1, -1);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", 10, 5, -5);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", 10, 9, -9);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", 10, 10, -10);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", 10, 11, -10);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", 19, 0, 0);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", 19, 1, -1);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", 19, 2, -1);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", 20, 0, 0);
+}
+
+void test54()
+{
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", 20, 1, 0);
+    test("abcdefghijklmnopqrst", 20, 1, "abcdefghijklmnopqrst", 21, 0, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "", 0, 0, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "", 0, 1, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcde", 0, 0, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcde", 0, 1, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcde", 0, 2, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcde", 0, 4, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcde", 0, 5, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcde", 0, 6, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcde", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcde", 1, 1, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcde", 1, 2, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcde", 1, 3, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcde", 1, 4, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcde", 1, 5, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcde", 2, 0, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcde", 2, 1, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcde", 2, 2, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcde", 2, 3, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcde", 2, 4, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcde", 4, 0, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcde", 4, 1, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcde", 4, 2, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcde", 5, 0, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcde", 5, 1, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcde", 6, 0, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 0, 0, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 0, 1, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 0, 5, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 0, 9, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 0, 10, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 0, 11, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 1, 1, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 1, 4, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 1, 8, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 1, 9, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 1, 10, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 5, 0, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 5, 1, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 5, 2, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 5, 4, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 5, 5, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 5, 6, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 9, 0, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 9, 1, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 9, 2, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 10, 0, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 10, 1, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghij", 11, 0, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 0, 0, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 0, 1, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 0, 10, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 0, 19, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 0, 20, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 0, 21, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 1, 0, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 1, 1, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 1, 9, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 1, 18, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 1, 19, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 1, 20, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 10, 0, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 10, 1, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 10, 5, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 10, 9, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 10, 10, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 10, 11, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 19, 0, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 19, 1, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 19, 2, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 20, 0, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 20, 1, 0);
+    test("abcdefghijklmnopqrst", 21, 0, "abcdefghijklmnopqrst", 21, 0, 0);
+}
+
+
+int main () {
+    test0();
+    test1();
+    test2();
+    test3();
+    test4();
+    test5();
+    test6();
+    test7();
+    test8();
+    test9();
+    test10();
+    test11();
+    test12();
+    test13();
+    test14();
+    test15();
+    test16();
+    test17();
+    test18();
+    test19();
+    test20();
+    test21();
+    test22();
+    test23();
+    test24();
+    test25();
+    test26();
+    test27();
+    test28();
+    test29();
+    test30();
+    test31();
+    test32();
+    test33();
+    test34();
+    test35();
+    test36();
+    test37();
+    test38();
+    test39();
+    test40();
+    test41();
+    test42();
+    test43();
+    test44();
+    test45();
+    test46();
+    test47();
+    test48();
+    test49();
+    test50();
+    test51();
+    test52();
+    test53();
+    test54();
+
+
+    {
+    test("abcde", 5, 1, "", 0, 0, 0);
+    test("abcde", 2, 4, "", 0, 0, 3);
+    test("abcde", 2, 4, "abcde", 3, 4, -2);
+    test("ABCde", 2, 4, "abcde", 2, 4, -1);
+    }
+
+    {
+    test(L"abcde", 5, 1, L"", 0, 0, 0);
+    test(L"abcde", 2, 4, L"", 0, 0, 3);
+    test(L"abcde", 2, 4, L"abcde", 3, 4, -2);
+    test(L"ABCde", 2, 4, L"abcde", 2, 4, -1);
+    }
+
+#if TEST_STD_VER >= 11
+    {
+    test(u"abcde", 5, 1, u"", 0, 0, 0);
+    test(u"abcde", 2, 4, u"", 0, 0, 3);
+    test(u"abcde", 2, 4, u"abcde", 3, 4, -2);
+    test(u"ABCde", 2, 4, u"abcde", 2, 4, -1);
+    }
+
+    {
+    test(U"abcde", 5, 1, U"", 0, 0, 0);
+    test(U"abcde", 2, 4, U"", 0, 0, 3);
+    test(U"abcde", 2, 4, U"abcde", 3, 4, -2);
+    test(U"ABCde", 2, 4, U"abcde", 2, 4, -1);
+    }
+#endif
+
+#if TEST_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1 { "abcde", 5 };
+    static_assert ( sv1.compare(5, 1, "", 0, 0) == 0, "" );
+    static_assert ( sv1.compare(2, 4, "", 0, 0) == 1, "" );
+    static_assert ( sv1.compare(2, 4, "abcde", 3, 4) == -1, "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.ops/compare.sv.pass.cpp

@@ -0,0 +1,121 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+
+// <string_view>
+// constexpr int compare(basic_string_view str) const noexcept;
+
+#include <string_view>
+#include <cassert>
+
+#include "constexpr_char_traits.hpp"
+
+int sign ( int x ) { return x > 0 ? 1 : ( x < 0 ? -1 : 0 ); }
+
+template<typename CharT>
+void test1 ( std::basic_string_view<CharT> sv1,
+            std::basic_string_view<CharT> sv2, int expected ) {
+    assert ( sign( sv1.compare(sv2)) == sign(expected));
+}
+
+
+template<typename CharT>
+void test ( const CharT *s1, const CharT  *s2, int expected ) {
+    typedef std::basic_string_view<CharT> string_view_t;
+
+    string_view_t sv1 ( s1 );
+    string_view_t sv2 ( s2 );
+    test1(sv1, sv2, expected);
+}
+
+int main () {
+
+    test("",                     "", 0);
+    test("",                     "abcde", -5);
+    test("",                     "abcdefghij", -10);
+    test("",                     "abcdefghijklmnopqrst", -20);
+    test("abcde",                "", 5);
+    test("abcde",                "abcde", 0);
+    test("abcde",                "abcdefghij", -5);
+    test("abcde",                "abcdefghijklmnopqrst", -15);
+    test("abcdefghij",           "", 10);
+    test("abcdefghij",           "abcde", 5);
+    test("abcdefghij",           "abcdefghij", 0);
+    test("abcdefghij",           "abcdefghijklmnopqrst", -10);
+    test("abcdefghijklmnopqrst", "", 20);
+    test("abcdefghijklmnopqrst", "abcde", 15);
+    test("abcdefghijklmnopqrst", "abcdefghij", 10);
+    test("abcdefghijklmnopqrst", "abcdefghijklmnopqrst", 0);
+
+    test(L"",                     L"", 0);
+    test(L"",                     L"abcde", -5);
+    test(L"",                     L"abcdefghij", -10);
+    test(L"",                     L"abcdefghijklmnopqrst", -20);
+    test(L"abcde",                L"", 5);
+    test(L"abcde",                L"abcde", 0);
+    test(L"abcde",                L"abcdefghij", -5);
+    test(L"abcde",                L"abcdefghijklmnopqrst", -15);
+    test(L"abcdefghij",           L"", 10);
+    test(L"abcdefghij",           L"abcde", 5);
+    test(L"abcdefghij",           L"abcdefghij", 0);
+    test(L"abcdefghij",           L"abcdefghijklmnopqrst", -10);
+    test(L"abcdefghijklmnopqrst", L"", 20);
+    test(L"abcdefghijklmnopqrst", L"abcde", 15);
+    test(L"abcdefghijklmnopqrst", L"abcdefghij", 10);
+    test(L"abcdefghijklmnopqrst", L"abcdefghijklmnopqrst", 0);
+
+#if TEST_STD_VER >= 11
+    test(u"",                     u"", 0);
+    test(u"",                     u"abcde", -5);
+    test(u"",                     u"abcdefghij", -10);
+    test(u"",                     u"abcdefghijklmnopqrst", -20);
+    test(u"abcde",                u"", 5);
+    test(u"abcde",                u"abcde", 0);
+    test(u"abcde",                u"abcdefghij", -5);
+    test(u"abcde",                u"abcdefghijklmnopqrst", -15);
+    test(u"abcdefghij",           u"", 10);
+    test(u"abcdefghij",           u"abcde", 5);
+    test(u"abcdefghij",           u"abcdefghij", 0);
+    test(u"abcdefghij",           u"abcdefghijklmnopqrst", -10);
+    test(u"abcdefghijklmnopqrst", u"", 20);
+    test(u"abcdefghijklmnopqrst", u"abcde", 15);
+    test(u"abcdefghijklmnopqrst", u"abcdefghij", 10);
+    test(u"abcdefghijklmnopqrst", u"abcdefghijklmnopqrst", 0);
+
+    test(U"",                     U"", 0);
+    test(U"",                     U"abcde", -5);
+    test(U"",                     U"abcdefghij", -10);
+    test(U"",                     U"abcdefghijklmnopqrst", -20);
+    test(U"abcde",                U"", 5);
+    test(U"abcde",                U"abcde", 0);
+    test(U"abcde",                U"abcdefghij", -5);
+    test(U"abcde",                U"abcdefghijklmnopqrst", -15);
+    test(U"abcdefghij",           U"", 10);
+    test(U"abcdefghij",           U"abcde", 5);
+    test(U"abcdefghij",           U"abcdefghij", 0);
+    test(U"abcdefghij",           U"abcdefghijklmnopqrst", -10);
+    test(U"abcdefghijklmnopqrst", U"", 20);
+    test(U"abcdefghijklmnopqrst", U"abcde", 15);
+    test(U"abcdefghijklmnopqrst", U"abcdefghij", 10);
+    test(U"abcdefghijklmnopqrst", U"abcdefghijklmnopqrst", 0);
+#endif
+
+#if _LIBCPP_STD_VER > 11
+    {
+    typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
+    constexpr SV  sv1 { "abcde", 5 };
+    constexpr SV  sv2 { "abcde", 5 };
+    constexpr SV  sv3 { "edcba0", 6 };
+    static_assert ( sv1.compare(sv2) == 0, "" );
+    static_assert ( sv2.compare(sv1) == 0, "" );
+    static_assert ( sv3.compare(sv2)  > 0, "" );
+    static_assert ( sv2.compare(sv3)  < 0, "" );
+    }
+#endif
+}

test/std/strings/string.view/string.view.ops/copy.pass.cpp

@@ -0,0 +1,101 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// size_type copy(charT* s, size_type n, size_type pos = 0) const;
+
+// Throws: out_of_range if pos > size().
+// Remarks: Let rlen be the smaller of n and size() - pos.
+// Requires: [s, s+rlen) is a valid range.
+// Effects: Equivalent to std::copy_n(begin() + pos, rlen, s).
+// Returns: rlen.
+
+
+#include <string_view>
+#include <cassert>
+
+#include "test_macros.h"
+
+template<typename CharT>
+void test1 ( std::basic_string_view<CharT> sv, size_t n, size_t pos ) {
+    const size_t rlen = std::min ( n, sv.size() - pos );
+
+    CharT *dest1 = new CharT [rlen + 1];    dest1[rlen] = 0;
+    CharT *dest2 = new CharT [rlen + 1];    dest2[rlen] = 0;
+
+    if (pos > sv.size()) {
+#ifndef TEST_HAS_NO_EXCEPTIONS
+        try {
+            sv.copy(dest1, n, pos);
+            assert(false);
+        } catch (const std::out_of_range&) {
+        } catch (...) {
+            assert(false);
+        }
+#endif
+    } else {
+        sv.copy(dest1, n, pos);
+        std::copy_n(sv.begin() + pos, rlen, dest2);
+        for ( size_t i = 0; i <= rlen; ++i )
+            assert ( dest1[i] == dest2[i] );
+    }
+    delete [] dest1;
+    delete [] dest2;
+}
+
+
+template<typename CharT>
+void test ( const CharT *s ) {
+    typedef std::basic_string_view<CharT> string_view_t;
+
+    string_view_t sv1 ( s );
+
+    test1(sv1,  0, 0);
+    test1(sv1,  1, 0);
+    test1(sv1, 20, 0);
+    test1(sv1, sv1.size(), 0);
+    test1(sv1, 20, string_view_t::npos);
+
+    test1(sv1,   0, 3);
+    test1(sv1,   2, 3);
+    test1(sv1, 100, 3);
+    test1(sv1, 100, string_view_t::npos);
+
+    test1(sv1, sv1.size(), string_view_t::npos);
+
+    test1(sv1, sv1.size() + 1, 0);
+    test1(sv1, sv1.size() + 1, 1);
+    test1(sv1, sv1.size() + 1, string_view_t::npos);
+
+}
+
+int main () {
+    test ( "ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
+    test ( "ABCDE");
+    test ( "a" );
+    test ( "" );
+
+    test ( L"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
+    test ( L"ABCDE" );
+    test ( L"a" );
+    test ( L"" );
+
+#if TEST_STD_VER >= 11
+    test ( u"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
+    test ( u"ABCDE" );
+    test ( u"a" );
+    test ( u"" );
+
+    test ( U"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
+    test ( U"ABCDE" );
+    test ( U"a" );
+    test ( U"" );
+#endif
+}

test/std/strings/string.view/string.view.ops/substr.pass.cpp

@@ -0,0 +1,110 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string_view>
+
+// constexpr basic_string_view substr(size_type pos = 0, size_type n = npos) const;
+
+// Throws: out_of_range if pos > size().
+// Effects: Determines the effective length rlen of the string to reference as the smaller of n and size() - pos.
+// Returns: basic_string_view(data()+pos, rlen).
+
+#include <string_view>
+#include <cassert>
+
+#include "test_macros.h"
+
+template<typename CharT>
+void test1(std::basic_string_view<CharT> sv, size_t n, size_t pos) {
+	try {
+		std::basic_string_view<CharT> sv1 = sv.substr(pos, n);
+        const size_t rlen = std::min(n, sv.size() - pos);
+        assert (sv1.size() == rlen);
+        for (size_t i = 0; i <= rlen; ++i)
+            assert(sv[pos+i] == sv1[i]);
+	}
+	catch (const std::out_of_range&) {
+		assert(pos > sv.size());
+	}
+}
+
+
+template<typename CharT>
+void test ( const CharT *s ) {
+    typedef std::basic_string_view<CharT> string_view_t;
+
+    string_view_t sv1 ( s );
+
+    test1(sv1,  0, 0);
+    test1(sv1,  1, 0);
+    test1(sv1, 20, 0);
+    test1(sv1, sv1.size(), 0);
+
+    test1(sv1,   0, 3);
+    test1(sv1,   2, 3);
+    test1(sv1, 100, 3);
+
+    test1(sv1, 0, string_view_t::npos);
+    test1(sv1, 2, string_view_t::npos);
+    test1(sv1, sv1.size(), string_view_t::npos);
+
+    test1(sv1, sv1.size() + 1, 0);
+    test1(sv1, sv1.size() + 1, 1);
+    test1(sv1, sv1.size() + 1, string_view_t::npos);
+}
+
+int main () {
+    test ( "ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
+    test ( "ABCDE");
+    test ( "a" );
+    test ( "" );
+
+    test ( L"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
+    test ( L"ABCDE" );
+    test ( L"a" );
+    test ( L"" );
+
+#if TEST_STD_VER >= 11
+    test ( u"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
+    test ( u"ABCDE" );
+    test ( u"a" );
+    test ( u"" );
+
+    test ( U"ABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDEABCDE" );
+    test ( U"ABCDE" );
+    test ( U"a" );
+    test ( U"" );
+#endif
+
+#if TEST_STD_VER > 11
+    {
+    constexpr std::string_view sv1 { "ABCDE", 5 };
+
+    {
+    constexpr std::string_view sv2 = sv1.substr ( 0, 3 );
+    static_assert ( sv2.size() == 3, "" );
+    static_assert ( sv2[0] == 'A', "" );
+    static_assert ( sv2[1] == 'B', "" );
+    static_assert ( sv2[2] == 'C', "" );
+    }
+
+    {
+    constexpr std::string_view sv2 = sv1.substr ( 3, 0 );
+    static_assert ( sv2.size() == 0, "" );
+    }
+
+    {
+    constexpr std::string_view sv2 = sv1.substr ( 3, 3 );
+    static_assert ( sv2.size() == 2, "" );
+    static_assert ( sv2[0] == 'D', "" );
+    static_assert ( sv2[1] == 'E', "" );
+    }
+    }
+#endif
+}

test/std/strings/string.view/string.view.synop/nothing_to_do.pass.cpp

@@ -0,0 +1,12 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include <string_view>
+
+int main () {}

test/std/strings/string.view/string.view.template/nothing_to_do.pass.cpp

@@ -0,0 +1,12 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include <string_view>
+
+int main () {}