On Wed, Aug 28, 2024 at 5:23 AM Mark Cave-Ayland
<mark.cave-ayl...@ilande.co.uk> wrote:
>
> 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>
Reviewed-by: Octavian Purdila <ta...@google.com>
> ---
> 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
>
