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* Copyright (c) 2010 Lenka Trochtova
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* - The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* 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
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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/** @addtogroup ns8250
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#ifndef CYCLIC_BUFFER_H_
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#define CYCLIC_BUFFER_H_
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typedef struct cyclic_buffer {
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* @return False if the buffer is full.
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static inline bool buf_push_back(cyclic_buffer_t *buf, uint8_t item)
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if (buf->cnt >= BUF_LEN)
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int pos = (buf->start + buf->cnt) % BUF_LEN;
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static inline bool buf_is_empty(cyclic_buffer_t *buf)
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static inline uint8_t buf_pop_front(cyclic_buffer_t *buf)
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assert(!buf_is_empty(buf));
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uint8_t res = buf->buf[buf->start];
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buf->start = (buf->start + 1) % BUF_LEN;
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static inline void buf_clear(cyclic_buffer_t *buf)