px4-firmware/nuttx/tools/cfgparser.c

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/****************************************************************************
* tools/cfgpaser.c
*
* Copyright (C) 2007-2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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 NuttX 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <string.h>
#include <ctype.h>
#include "cfgparser.h"
/****************************************************************************
* Definitions
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
char line[LINESIZE+1];
/****************************************************************************
* Private Functions
****************************************************************************/
static char *skip_space(char *ptr)
{
while (*ptr && isspace((int)*ptr)) ptr++;
return ptr;
}
static char *find_name_end(char *ptr)
{
while (*ptr && (isalnum((int)*ptr) || *ptr == '_')) ptr++;
return ptr;
}
static char *find_value_end(char *ptr)
{
while (*ptr && !isspace((int)*ptr))
{
if (*ptr == '"')
{
do ptr++; while (*ptr && *ptr != '"');
if (*ptr) ptr++;
}
else
{
do ptr++; while (*ptr && !isspace((int)*ptr) && *ptr != '"');
}
}
return ptr;
}
static char *read_line(FILE *stream)
{
char *ptr;
for (;;)
{
line[LINESIZE] = '\0';
if (!fgets(line, LINESIZE, stream))
{
return NULL;
}
else
{
ptr = skip_space(line);
if (*ptr && *ptr != '#' && *ptr != '\n')
{
return ptr;
}
}
}
}
static void parse_line(char *ptr, char **varname, char **varval)
{
*varname = ptr;
*varval = NULL;
ptr = find_name_end(ptr);
if (*ptr && *ptr != '=')
{
*ptr = '\0';
ptr = skip_space(ptr + 1);
}
if (*ptr == '=')
{
*ptr = '\0';
ptr = skip_space(ptr + 1);
if (*ptr)
{
*varval = ptr;
ptr = find_value_end(ptr);
*ptr = '\0';
}
}
}
/****************************************************************************
* Public Functions
****************************************************************************/
void parse_file(FILE *stream)
{
char *varname;
char *varval;
char *ptr;
do
{
ptr = read_line(stream);
if (ptr)
{
parse_line(ptr, &varname, &varval);
if (varname)
{
if (!varval || strcmp(varval, "n") == 0)
{
printf("#undef %s\n", varname);
}
else if (strcmp(varval, "y") == 0)
{
printf("#define %s 1\n", varname);
}
else
{
printf("#define %s %s\n", varname, varval);
}
}
}
}
while (ptr);
}