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de16f5e2a7
Move router code into "router" and move send_data into "tools", in order to make things cleaner as the implementation gains further components. Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
63 lines
2.1 KiB
C
63 lines
2.1 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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#include <stdlib.h>
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#include <unistd.h>
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#include "circ_buf.h"
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/**
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* circ_read() - read data into circular buffer
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* @fd: non-blocking file descriptor to read
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* @buf: circ_buf object to write to
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*
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* Return: 0 if fifo is full or fd depleted, negative errno on failure
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*/
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ssize_t circ_read(int fd, struct circ_buf *buf)
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{
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size_t space;
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ssize_t n;
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do {
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space = CIRC_SPACE_TO_END(buf);
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if (!space)
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return 0;
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n = read(fd, buf->buf + buf->head, space);
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if (n < 0)
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return n;
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buf->head = (buf->head + n) & (HDLC_BUF_SIZE - 1);
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} while (n == space);
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return 0;
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}
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