openmv/common/ringbuf.c
iabdalkader daf2bb30da misc: Restructure repo.
Signed-off-by: iabdalkader <i.abdalkader@gmail.com>
2025-04-13 08:28:34 +02:00

58 lines
1.8 KiB
C

/*
* SPDX-License-Identifier: MIT
*
* Copyright (C) 2013-2024 OpenMV, LLC.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* Simple Ring Buffer implementation.
*/
#include <string.h>
#include "ringbuf.h"
void ring_buf_init(ring_buf_t *buf) {
memset(buf, 0, sizeof(*buf));
}
int ring_buf_empty(ring_buf_t *buf) {
return (buf->head == buf->tail);
}
void ring_buf_put(ring_buf_t *buf, uint8_t c) {
if ((buf->tail + 1) % BUFFER_SIZE == buf->head) {
/*buffer is full*/
return;
}
buf->data[buf->tail] = c;
buf->tail = (buf->tail + 1) % BUFFER_SIZE;
}
uint8_t ring_buf_get(ring_buf_t *buf) {
uint8_t c;
if (buf->head == buf->tail) {
/*buffer is empty*/
return 0;
}
c = buf->data[buf->head];
buf->head = (buf->head + 1) % BUFFER_SIZE;
return c;
}