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58 lines
2.2 KiB
C
58 lines
2.2 KiB
C
/*
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* Copyright (c) 2018, Linaro Ltd.
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* All rights reserved.
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*
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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 are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its contributors
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* may be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __CIRC_BUF_H__
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#define __CIRC_BUF_H__
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#include <stdlib.h>
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#ifndef MIN
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#define MIN(x, y) ((x) < (y) ? (x) : (y))
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#endif
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#define CIRC_BUF_SIZE 16384
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struct circ_buf {
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char buf[CIRC_BUF_SIZE];
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size_t head;
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size_t tail;
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};
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#define CIRC_AVAIL(circ) (((circ)->head - (circ)->tail) & (CIRC_BUF_SIZE - 1))
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#define CIRC_SPACE(circ) (((circ)->tail - (circ)->head - 1) & (CIRC_BUF_SIZE - 1))
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#define CIRC_SPACE_TO_END(circ) MIN(CIRC_SPACE(circ), CIRC_BUF_SIZE - (circ)->head)
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ssize_t circ_fill(int fd, struct circ_buf *circ);
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size_t circ_peak(struct circ_buf *circ, void *buf, size_t len);
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size_t circ_read(struct circ_buf *circ, void *buf, size_t len);
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#endif
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