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bde90b4a15
Replace all license headers with the SPDX-License-Identitier headers to follow the current recommendations. Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
34 lines
779 B
C
34 lines
779 B
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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* SPDX-License-Identifier: BSD-3-Clause
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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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