fifo8: introduce fifo8_peek() function

This allows uses to peek the byte at the current head of the FIFO.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Octavian Purdila <tavip@google.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20240828122258.928947-9-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/include/qemu/fifo8.h b/include/qemu/fifo8.h
index d09984b..4f768d4 100644
--- a/include/qemu/fifo8.h
+++ b/include/qemu/fifo8.h
@@ -63,6 +63,17 @@ void fifo8_push_all(Fifo8 *fifo, const uint8_t *data, uint32_t num);
 uint8_t fifo8_pop(Fifo8 *fifo);
 
 /**
+ * fifo8_peek:
+ * @fifo: fifo to peek from
+ *
+ * Peek the data byte at the current head of the FIFO. Clients are responsible
+ * for checking for emptyness using fifo8_is_empty().
+ *
+ * Returns: The peeked data byte.
+ */
+uint8_t fifo8_peek(Fifo8 *fifo);
+
+/**
  * fifo8_pop_buf:
  * @fifo: FIFO to pop from
  * @dest: the buffer to write the data into (can be NULL)