util/fifo8: Rename fifo8_peek_buf() -> fifo8_peek_bufptr()

Since fifo8_peek_buf() return a const buffer (which points
directly into the FIFO backing store). Rename it using the
'bufptr' suffix to better reflect that it is a pointer to
the internal buffer that is being returned. This will help
differentiate with methods *copying* the FIFO data.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Message-Id: <20240722160745.67904-5-philmd@linaro.org>

hw/scsi/esp.c

@@ -486,7 +486,7 @@ static bool esp_cdb_ready(ESPState *s)
         return false;
     }
 
-    pbuf = fifo8_peek_buf(&s->cmdfifo, len, &n);
+    pbuf = fifo8_peek_bufptr(&s->cmdfifo, len, &n);
     if (n < len) {
         /*
          * In normal use the cmdfifo should never wrap, but include this check

include/qemu/fifo8.h

@@ -89,16 +89,17 @@ uint8_t fifo8_pop(Fifo8 *fifo);
 const uint8_t *fifo8_pop_buf(Fifo8 *fifo, uint32_t max, uint32_t *numptr);
 
 /**
- * fifo8_peek_buf: read upto max bytes from the fifo
+ * fifo8_peek_bufptr: read upto max bytes from the fifo
  * @fifo: FIFO to read from
  * @max: maximum number of bytes to peek
  * @numptr: pointer filled with number of bytes returned (can be NULL)
  *
  * Peek into a number of elements from the FIFO up to a maximum of @max.
  * The buffer containing the data peeked into is returned. This buffer points
- * directly into the FIFO backing store. Since data is invalidated once any
- * of the fifo8_* APIs are called on the FIFO, it is the caller responsibility
- * to access it before doing further API calls.
+ * directly into the internal FIFO backing store (without checking for
+ * overflow!). Since data is invalidated once any of the fifo8_* APIs are
+ * called on the FIFO, it is the caller responsibility to access it before
+ * doing further API calls.
  *
  * The function may return fewer bytes than requested when the data wraps
  * around in the ring buffer; in this case only a contiguous part of the data
@@ -113,7 +114,7 @@ const uint8_t *fifo8_pop_buf(Fifo8 *fifo, uint32_t max, uint32_t *numptr);
  *
  * Returns: A pointer to peekable data.
  */
-const uint8_t *fifo8_peek_buf(Fifo8 *fifo, uint32_t max, uint32_t *numptr);
+const uint8_t *fifo8_peek_bufptr(Fifo8 *fifo, uint32_t max, uint32_t *numptr);
 
 /**
  * fifo8_reset:

util/fifo8.c

@@ -92,7 +92,7 @@ static const uint8_t *fifo8_peekpop_buf(Fifo8 *fifo, uint32_t max,
     return ret;
 }
 
-const uint8_t *fifo8_peek_buf(Fifo8 *fifo, uint32_t max, uint32_t *numptr)
+const uint8_t *fifo8_peek_bufptr(Fifo8 *fifo, uint32_t max, uint32_t *numptr)
 {
     return fifo8_peekpop_buf(fifo, max, numptr, false);
 }