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