dark0707
/
px4-firmware
forked from Archive/PX4-Autopilot
1
0
Fork 0
Code Pull Requests Activity
px4-firmware/nuttx/tools/cfgparser.c

323 lines
8.5 KiB
C
Raw Blame History

/****************************************************************************
* tools/cfgpaser.c
*
* Copyright (C) 2007-2012 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <>
*
* 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 Data
****************************************************************************/
/* These are configuration variable name that are quoted by configuration tool
* but which must be unquoted when used in C code.
*/
static const char *dequote_list[] =
{
/* NuttX */
"CONFIG_USER_ENTRYPOINT", /* Name of entry point function */
/* NxWidgets/NxWM */
"CONFIG_NXWM_BACKGROUND_IMAGE", /* Name of bitmap image class */
"CONFIG_NXWM_STARTWINDOW_ICON", /* Name of bitmap image class */
"CONFIG_NXWM_NXCONSOLE_ICON", /* Name of bitmap image class */
"CONFIG_NXWM_CALIBRATION_ICON", /* Name of bitmap image class */
"CONFIG_NXWM_HEXCALCULATOR_ICON", /* Name of bitmap image class */
NULL /* Marks the end of the list */
};
/****************************************************************************
* Private Functions
****************************************************************************/
/* Skip over any spaces */
static char *skip_space(char *ptr)
{
while (*ptr && isspace((int)*ptr)) ptr++;
return ptr;
}
/* Find the end of a variable string */
static char *find_name_end(char *ptr)
{
while (*ptr && (isalnum((int)*ptr) || *ptr == '_')) ptr++;
return ptr;
}
/* Find the end of a value string */
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;
}
/* Read the next line from the configuration file */
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;
}
}
}
}
/* Parse the line from the configuration file into a variable name
* string and a value string.
*/
static void parse_line(char *ptr, char **varname, char **varval)
{
/* Skip over any leading spaces */
ptr = skip_space(ptr);
/* The first no-space is the beginning of the variable name */
*varname = skip_space(ptr);
*varval = NULL;
/* Parse to the end of the variable name */
ptr = find_name_end(ptr);
/* An equal sign is expected next, perhaps after some white space */
if (*ptr && *ptr != '=')
{
/* Some else follows the variable name. Terminate the variable
* name and skip over any spaces.
*/
*ptr = '\0';
ptr = skip_space(ptr + 1);
}
/* Verify that the equal sign is present */
if (*ptr == '=')
{
/* Make sure that the variable name is terminated (this was already
* done if the name was followed by white space.
*/
*ptr = '\0';
/* The variable value should follow =, perhaps separated by some
* white space.
*/
ptr = skip_space(ptr + 1);
if (*ptr)
{
/* Yes.. a variable follows. Save the pointer to the start
* of the variable string.
*/
*varval = ptr;
/* Find the end of the variable string and make sure that it
* is terminated.
*/
ptr = find_value_end(ptr);
*ptr = '\0';
}
}
}
static char *dequote_value(const char *varname, char *varval)
{
const char **dqnam;
char *dqval = varval;
int len;
if (dqval)
{
/* Check if the variable name is in the list of strings to be dequoated */
for (dqnam = dequote_list; *dqnam; dqnam++)
{
if (strcmp(*dqnam, varname) == 0)
{
break;
}
}
/* Did we find the variable name in the list of configuration variables
* to be dequoated?
*/
if (*dqnam)
{
/* Yes... Check if there is a traiing quote */
len = strlen(dqval);
if (dqval[len-1] == '"')
{
/* Yes... replace it with a terminator */
dqval[len-1] = '\0';
len--;
}
/* Is there a leading quote? */
if (dqval[0] == '"')
{
/* Yes.. skip over the leading quote */
dqval++;
len--;
}
/* Handle the case where nothing is left after dequoting */
if (len <= 0)
{
dqval = NULL;
}
}
}
return dqval;
}
/****************************************************************************
* Public Functions
****************************************************************************/
void parse_file(FILE *stream)
{
char *varname;
char *varval;
char *ptr;
/* Loop until the entire file has been parsed. */
do
{
/* Read the next line from the file */
ptr = read_line(stream);
if (ptr)
{
/* Parse the line into a variable and a value field */
parse_line(ptr, &varname, &varval);
/* Was a variable name found? */
if (varname)
{
/* Yes.. dequote the value if necessary */
varval = dequote_value(varname, varval);
/* If no value was provided or if the special value 'n' was provided,
* then undefine the configuration variable.
*/
if (!varval || strcmp(varval, "n") == 0)
{
printf("#undef %s\n", varname);
}
/* Simply define the configuration variable if it has the special
* value "y"
*/
else if (strcmp(varval, "y") == 0)
{
printf("#define %s 1\n", varname);
}
/* Otherwise, use the value as provided */
else
{
printf("#define %s %s\n", varname, varval);
}
}
}
}
while (ptr);
}
View Git Blame Copy Permalink