forked from Archive/PX4-Autopilot
90 lines
2.9 KiB
C
90 lines
2.9 KiB
C
/****************************************************************************
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*
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* Copyright (C) 2012 PX4 Development Team. All rights reserved.
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* Author: Lorenz Meier <lm@inf.ethz.ch>
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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
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* are met:
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*
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* 1. 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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name PX4 nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* 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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****************************************************************************/
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/**
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* @file mavlink_log.c
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* MAVLink text logging.
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*
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* @author Lorenz Meier <lm@inf.ethz.ch>
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*/
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#include <string.h>
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#include <stdlib.h>
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#include "mavlink_log.h"
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void mavlink_logbuffer_init(struct mavlink_logbuffer *lb, int size)
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{
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lb->size = size;
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lb->start = 0;
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lb->count = 0;
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lb->elems = (struct mavlink_logmessage *)calloc(lb->size, sizeof(struct mavlink_logmessage));
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}
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int mavlink_logbuffer_is_full(struct mavlink_logbuffer *lb)
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{
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return lb->count == (int)lb->size;
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}
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int mavlink_logbuffer_is_empty(struct mavlink_logbuffer *lb)
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{
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return lb->count == 0;
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}
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void mavlink_logbuffer_write(struct mavlink_logbuffer *lb, const struct mavlink_logmessage *elem)
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{
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int end = (lb->start + lb->count) % lb->size;
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memcpy(&(lb->elems[end]), elem, sizeof(struct mavlink_logmessage));
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if (mavlink_logbuffer_is_full(lb)) {
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lb->start = (lb->start + 1) % lb->size; /* full, overwrite */
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} else {
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++lb->count;
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}
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}
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int mavlink_logbuffer_read(struct mavlink_logbuffer *lb, struct mavlink_logmessage *elem)
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{
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if (!mavlink_logbuffer_is_empty(lb)) {
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memcpy(elem, &(lb->elems[lb->start]), sizeof(struct mavlink_logmessage));
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lb->start = (lb->start + 1) % lb->size;
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--lb->count;
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return 0;
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} else {
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return 1;
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}
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}
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