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util/fifo8: Allow fifo8_pop_buf() to not populate popped length

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There might be cases where we know the number of bytes we can
pop from the FIFO, or we simply don't care how many bytes is
returned. Allow fifo8_pop_buf() to take a NULL numptr.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Francisco Iglesias <frasse.iglesias@gmail.com>
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: <20231109192814.95977-2-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 20:28:05 +01:00
committed by Mark Cave-Ayland
parent 9468484fe9
commit cd04033dbe
2 changed files with 13 additions and 9 deletions
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12
util/fifo8.c
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@@ -66,16 +66,20 @@ uint8_t fifo8_pop(Fifo8 *fifo)
return ret;
}
const uint8_t *fifo8_pop_buf(Fifo8 *fifo, uint32_t max, uint32_t *num)
const uint8_t *fifo8_pop_buf(Fifo8 *fifo, uint32_t max, uint32_t *numptr)
{
uint8_t *ret;
uint32_t num;
assert(max > 0 && max <= fifo->num);
*num = MIN(fifo->capacity - fifo->head, max);
num = MIN(fifo->capacity - fifo->head, max);
ret = &fifo->data[fifo->head];
fifo->head += *num;
fifo->head += num;
fifo->head %= fifo->capacity;
fifo->num -= *num;
fifo->num -= num;
if (numptr) {
*numptr = num;
}
return ret;
}