util/fifo8: Rename fifo8_pop_buf() -> fifo8_pop_bufptr()

Since fifo8_pop_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: <20240722160745.67904-6-philmd@linaro.org>

chardev/msmouse.c

@@ -81,7 +81,7 @@ static void msmouse_chr_accept_input(Chardev *chr)
         const uint8_t *buf;
         uint32_t size;
 
-        buf = fifo8_pop_buf(&mouse->outbuf, MIN(len, avail), &size);
+        buf = fifo8_pop_bufptr(&mouse->outbuf, MIN(len, avail), &size);
         qemu_chr_be_write(chr, buf, size);
         len = qemu_chr_be_can_write(chr);
         avail -= size;

hw/char/goldfish_tty.c

@@ -109,7 +109,7 @@ static void goldfish_tty_cmd(GoldfishTTYState *s, uint32_t cmd)
         len = s->data_len;
         ptr = s->data_ptr;
         while (len && !fifo8_is_empty(&s->rx_fifo)) {
-            const uint8_t *buf = fifo8_pop_buf(&s->rx_fifo, len, &to_copy);
+            const uint8_t *buf = fifo8_pop_bufptr(&s->rx_fifo, len, &to_copy);
 
             dma_memory_write_relaxed(&address_space_memory, ptr, buf, to_copy);
 

hw/net/allwinner_emac.c

@@ -349,7 +349,7 @@ static void aw_emac_write(void *opaque, hwaddr offset, uint64_t value,
                               "allwinner_emac: TX length > fifo data length\n");
             }
             if (len > 0) {
-                data = fifo8_pop_buf(fifo, len, &ret);
+                data = fifo8_pop_bufptr(fifo, len, &ret);
                 qemu_send_packet(nc, data, ret);
                 aw_emac_tx_reset(s, chan);
                 /* Raise TX interrupt */

hw/scsi/esp.c

@@ -208,7 +208,7 @@ static uint32_t esp_fifo8_pop_buf(Fifo8 *fifo, uint8_t *dest, int maxlen)
     }
 
     len = maxlen;
-    buf = fifo8_pop_buf(fifo, len, &n);
+    buf = fifo8_pop_bufptr(fifo, len, &n);
     if (dest) {
         memcpy(dest, buf, n);
     }
@@ -217,7 +217,7 @@ static uint32_t esp_fifo8_pop_buf(Fifo8 *fifo, uint8_t *dest, int maxlen)
     len -= n;
     len = MIN(len, fifo8_num_used(fifo));
     if (len) {
-        buf = fifo8_pop_buf(fifo, len, &n2);
+        buf = fifo8_pop_bufptr(fifo, len, &n2);
         if (dest) {
             memcpy(&dest[n], buf, n2);
         }

include/qemu/fifo8.h

@@ -63,15 +63,15 @@ void fifo8_push_all(Fifo8 *fifo, const uint8_t *data, uint32_t num);
 uint8_t fifo8_pop(Fifo8 *fifo);
 
 /**
- * fifo8_pop_buf:
+ * fifo8_pop_bufptr:
  * @fifo: FIFO to pop from
  * @max: maximum number of bytes to pop
  * @numptr: pointer filled with number of bytes returned (can be NULL)
  *
  * Pop a number of elements from the FIFO up to a maximum of @max. The buffer
  * containing the popped data is returned. This buffer points directly into
- * the FIFO backing store and data is invalidated once any of the fifo8_* APIs
- * are called on the FIFO.
+ * the internal FIFO backing store and data (without checking for overflow!)
+ * and is invalidated once any of the fifo8_* APIs are called on the FIFO.
  *
  * 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
@@ -86,7 +86,7 @@ uint8_t fifo8_pop(Fifo8 *fifo);
  *
  * Returns: A pointer to popped data.
  */
-const uint8_t *fifo8_pop_buf(Fifo8 *fifo, uint32_t max, uint32_t *numptr);
+const uint8_t *fifo8_pop_bufptr(Fifo8 *fifo, uint32_t max, uint32_t *numptr);
 
 /**
  * fifo8_peek_bufptr: read upto max bytes from the fifo
@@ -96,10 +96,9 @@ const uint8_t *fifo8_pop_buf(Fifo8 *fifo, uint32_t max, uint32_t *numptr);
  *
  * 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 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.
+ * 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.
  *
  * 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

ui/console-vc.c

@@ -287,7 +287,7 @@ static void kbd_send_chars(QemuTextConsole *s)
         const uint8_t *buf;
         uint32_t size;
 
-        buf = fifo8_pop_buf(&s->out_fifo, MIN(len, avail), &size);
+        buf = fifo8_pop_bufptr(&s->out_fifo, MIN(len, avail), &size);
         qemu_chr_be_write(s->chr, buf, size);
         len = qemu_chr_be_can_write(s->chr);
         avail -= size;

ui/gtk.c

@@ -1820,7 +1820,7 @@ static void gd_vc_send_chars(VirtualConsole *vc)
         const uint8_t *buf;
         uint32_t size;
 
-        buf = fifo8_pop_buf(&vc->vte.out_fifo, MIN(len, avail), &size);
+        buf = fifo8_pop_bufptr(&vc->vte.out_fifo, MIN(len, avail), &size);
         qemu_chr_be_write(vc->vte.chr, buf, size);
         len = qemu_chr_be_can_write(vc->vte.chr);
         avail -= size;

util/fifo8.c

@@ -97,7 +97,7 @@ const uint8_t *fifo8_peek_bufptr(Fifo8 *fifo, uint32_t max, uint32_t *numptr)
     return fifo8_peekpop_buf(fifo, max, numptr, false);
 }
 
-const uint8_t *fifo8_pop_buf(Fifo8 *fifo, uint32_t max, uint32_t *numptr)
+const uint8_t *fifo8_pop_bufptr(Fifo8 *fifo, uint32_t max, uint32_t *numptr)
 {
     return fifo8_peekpop_buf(fifo, max, numptr, true);
 }