89 lines
2.6 KiB
C
89 lines
2.6 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2016 Paul Sokolovsky
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef MICROPY_INCLUDED_PY_RINGBUF_H
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#define MICROPY_INCLUDED_PY_RINGBUF_H
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#include <stddef.h>
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#include <stdint.h>
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typedef struct _ringbuf_t {
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uint8_t *buf;
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uint16_t size;
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uint16_t iget;
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uint16_t iput;
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} ringbuf_t;
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// Static initialization:
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// byte buf_array[N];
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// ringbuf_t buf = {buf_array, sizeof(buf_array)};
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// Dynamic initialization. This needs to become findable as a root pointer!
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#define ringbuf_alloc(r, sz) \
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{ \
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(r)->buf = m_new(uint8_t, sz); \
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(r)->size = sz; \
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(r)->iget = (r)->iput = 0; \
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}
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static inline int ringbuf_get(ringbuf_t *r) {
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if (r->iget == r->iput) {
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return -1;
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}
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uint8_t v = r->buf[r->iget++];
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if (r->iget >= r->size) {
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r->iget = 0;
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}
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return v;
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}
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static inline int ringbuf_put(ringbuf_t *r, uint8_t v) {
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uint32_t iput_new = r->iput + 1;
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if (iput_new >= r->size) {
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iput_new = 0;
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}
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if (iput_new == r->iget) {
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return -1;
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}
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r->buf[r->iput] = v;
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r->iput = iput_new;
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return 0;
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}
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static inline size_t ringbuf_free(ringbuf_t *r) {
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return (r->size + r->iget - r->iput - 1) % r->size;
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}
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static inline size_t ringbuf_avail(ringbuf_t *r) {
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return (r->size + r->iput - r->iget) % r->size;
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}
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// Note: big-endian. No-op if not enough room available for both bytes.
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int ringbuf_get16(ringbuf_t *r);
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int ringbuf_peek16(ringbuf_t *r);
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int ringbuf_put16(ringbuf_t *r, uint16_t v);
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#endif // MICROPY_INCLUDED_PY_RINGBUF_H
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