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util/fifo8: Introduce fifo8_peek_buf()

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To be able to peek at FIFO content without popping it,
introduce the fifo8_peek_buf() method by factoring
common content from fifo8_pop_buf().

Reviewed-by: Francisco Iglesias <frasse.iglesias@gmail.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Tested-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20231109192814.95977-3-philmd@linaro.org>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
This commit is contained in:
Philippe Mathieu-Daudé
2023-11-09 20:28:06 +01:00
committed by Mark Cave-Ayland
parent cd04033dbe
commit 995d8348eb
2 changed files with 45 additions and 4 deletions
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22
util/fifo8.c
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@ -66,7 +66,8 @@ uint8_t fifo8_pop(Fifo8 *fifo)
return ret;
}
const uint8_t *fifo8_pop_buf(Fifo8 *fifo, uint32_t max, uint32_t *numptr)
static const uint8_t *fifo8_peekpop_buf(Fifo8 *fifo, uint32_t max,
uint32_t *numptr, bool do_pop)
{
uint8_t *ret;
uint32_t num;
@ -74,15 +75,28 @@ const uint8_t *fifo8_pop_buf(Fifo8 *fifo, uint32_t max, uint32_t *numptr)
assert(max > 0 && max <= fifo->num);
num = MIN(fifo->capacity - fifo->head, max);
ret = &fifo->data[fifo->head];
fifo->head += num;
fifo->head %= fifo->capacity;
fifo->num -= num;
if (do_pop) {
fifo->head += num;
fifo->head %= fifo->capacity;
fifo->num -= num;
}
if (numptr) {
*numptr = num;
}
return ret;
}
const uint8_t *fifo8_peek_buf(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)
{
return fifo8_peekpop_buf(fifo, max, numptr, true);
}
void fifo8_reset(Fifo8 *fifo)
{
fifo->num = 0;