fifo8: add fifo8_peek_buf() function

This is a wrapper function around fifo8_peekpop_buf() that allows the
caller to peek into the FIFO, including handling the case where there
is a wraparound of the internal FIFO buffer.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Octavian Purdila <tavip@google.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20240828122258.928947-8-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/util/fifo8.c b/util/fifo8.c
index 1031ffbe7e..a8f5cea158 100644
--- a/util/fifo8.c
+++ b/util/fifo8.c
@@ -140,6 +140,11 @@ uint32_t fifo8_pop_buf(Fifo8 *fifo, uint8_t *dest, uint32_t destlen)
     return fifo8_peekpop_buf(fifo, dest, destlen, true);
 }
 
+uint32_t fifo8_peek_buf(Fifo8 *fifo, uint8_t *dest, uint32_t destlen)
+{
+    return fifo8_peekpop_buf(fifo, dest, destlen, false);
+}
+
 void fifo8_drop(Fifo8 *fifo, uint32_t len)
 {
     len -= fifo8_pop_buf(fifo, NULL, len);