This allows uses to peek the byte at the current head of the FIFO.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayl...@ilande.co.uk>
---
include/qemu/fifo8.h | 11 +++++++++++
util/fifo8.c | 6 ++++++
2 files changed, 17 insertions(+)
diff --git a/include/qemu/fifo8.h b/include/qemu/fifo8.h
index d09984b146..4f768d4ee3 100644
--- a/include/qemu/fifo8.h
+++ b/include/qemu/fifo8.h
@@ -62,6 +62,17 @@ 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
diff --git a/util/fifo8.c b/util/fifo8.c
index a8f5cea158..a26da66ad2 100644
--- a/util/fifo8.c
+++ b/util/fifo8.c
@@ -71,6 +71,12 @@ uint8_t fifo8_pop(Fifo8 *fifo)
return ret;
}
+uint8_t fifo8_peek(Fifo8 *fifo)
+{
+ assert(fifo->num > 0);
+ return fifo->data[fifo->head];
+}
+
static const uint8_t *fifo8_peekpop_bufptr(Fifo8 *fifo, uint32_t max,
uint32_t skip, uint32_t *numptr,
bool do_pop)
--
2.39.2
