Mixer.cpp
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/****************************************************************************
*
* Copyright (C) 2012 PX4 Development Team. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name PX4 nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/**
* @file mixer.cpp
*
* Programmable multi-channel mixer library.
*/
#include "Mixer.hpp"
#include <math.h>
#include <cstring>
#include <ctype.h>
#define debug(fmt, args...) do { } while(0)
//#define debug(fmt, args...) do { printf("[mixer] " fmt "\n", ##args); } while(0)
float
Mixer::get_control(uint8_t group, uint8_t index)
{
float value;
_control_cb(_cb_handle, group, index, value);
return value;
}
const char *
Mixer::findtag(const char *buf, unsigned &buflen, char tag)
{
while (buflen >= 2) {
if ((buf[0] == tag) && (buf[1] == ':')) {
return buf;
}
buf++;
buflen--;
}
return nullptr;
}
char
Mixer::findnexttag(const char *buf, unsigned buflen)
{
while (buflen >= 2) {
if (isupper(buf[0]) && buf[1] == ':') {
return buf[0];
}
buf++;
buflen--;
}
return 0;
}
const char *
Mixer::skipline(const char *buf, unsigned &buflen)
{
const char *p;
/* if we can find a CR or NL in the buffer, skip up to it */
if ((p = (const char *)memchr(buf, '\r', buflen)) || (p = (const char *)memchr(buf, '\n', buflen))) {
/* skip up to it AND one beyond - could be on the NUL symbol now */
buflen -= (p - buf) + 1;
return p + 1;
}
return nullptr;
}
bool
Mixer::string_well_formed(const char *buf, unsigned &buflen)
{
/* enforce that the mixer ends with a new line */
for (int i = buflen - 1; i >= 0; i--) {
if (buf[i] == '\0') {
continue;
}
/* require a space or newline at the end of the buffer, fail on printable chars */
if (buf[i] == '\n' || buf[i] == '\r') {
/* found a line ending, so no split symbols / numbers. good. */
return true;
}
}
debug("pre-parser rejected: No newline in buf");
return false;
}