diff options
| -rw-r--r-- | include/qemu/fifo8.h | 14 | ||||
| -rw-r--r-- | util/fifo8.c | 5 |
2 files changed, 19 insertions, 0 deletions
diff --git a/include/qemu/fifo8.h b/include/qemu/fifo8.h index d1d06754d8..d09984b146 100644 --- a/include/qemu/fifo8.h +++ b/include/qemu/fifo8.h @@ -77,6 +77,20 @@ uint8_t fifo8_pop(Fifo8 *fifo); uint32_t fifo8_pop_buf(Fifo8 *fifo, uint8_t *dest, uint32_t destlen); /** + * fifo8_peek_buf: + * @fifo: FIFO to read from + * @dest: the buffer to write the data into (can be NULL) + * @destlen: size of @dest and maximum number of bytes to peek + * + * Peek a number of elements from the FIFO up to a maximum of @destlen. + * The peeked data is copied into the @dest buffer. + * Care is taken when the data wraps around in the ring buffer. + * + * Returns: number of bytes peeked. + */ +uint32_t fifo8_peek_buf(Fifo8 *fifo, uint8_t *dest, uint32_t destlen); + +/** * fifo8_pop_bufptr: * @fifo: FIFO to pop from * @max: maximum number of bytes to pop diff --git a/util/fifo8.c b/util/fifo8.c index 1031ffbe7e..a8f5cea158 100644 --- a/util/fifo8.c +++ b/util/fifo8.c @@ -140,6 +140,11 @@ uint32_t fifo8_pop_buf(Fifo8 *fifo, uint8_t *dest, uint32_t destlen) return fifo8_peekpop_buf(fifo, dest, destlen, true); } +uint32_t fifo8_peek_buf(Fifo8 *fifo, uint8_t *dest, uint32_t destlen) +{ + return fifo8_peekpop_buf(fifo, dest, destlen, false); +} + void fifo8_drop(Fifo8 *fifo, uint32_t len) { len -= fifo8_pop_buf(fifo, NULL, len); |