83 lines
2.6 KiB
C
83 lines
2.6 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause */
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/* See the end of this file for copyright, licensing, and warranty information. */
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/* Simple ring buffer implementation. */
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#include <ardix/malloc.h>
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#include <ardix/ringbuf.h>
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#include <ardix/types.h>
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#include <stddef.h>
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struct ringbuf *ringbuf_create(size_t size)
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{
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struct ringbuf *buf = malloc(sizeof(*buf) + size);
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if (buf == NULL)
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return NULL;
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buf->capacity = size;
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buf->len = 0;
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buf->rpos = 0;
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buf->wpos = 0;
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return buf;
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}
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inline void ringbuf_destroy(struct ringbuf *buf)
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{
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free(buf);
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}
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size_t ringbuf_read(void *dest, struct ringbuf *buf, size_t len)
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{
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uint8_t *tmp = dest;
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while (len-- > 0 && buf->len > 0) {
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*tmp++ = buf->data[buf->rpos++];
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buf->len--;
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/* wrap around if required */
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buf->rpos %= buf->capacity;
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}
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return (size_t)tmp - (size_t)dest;
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}
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size_t ringbuf_write(struct ringbuf *buf, const void *src, size_t len)
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{
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const uint8_t *tmp = src;
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while (len-- > 0 && buf->len < buf->capacity) {
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buf->data[buf->wpos++] = *tmp++;
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buf->len++;
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/* wrap around if required */
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buf->wpos %= buf->capacity;
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}
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return (size_t)tmp - (size_t)src;
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}
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/*
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* Copyright (c) 2020 Felix Kopp <sandtler@sandtler.club>
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*
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* Redistribution and use in source and binary forms, with or without modification, are permitted
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* provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of its contributors may be
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* used to endorse or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
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* WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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