forked from Archive/PX4-Autopilot
297 lines
7.8 KiB
C
297 lines
7.8 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 <gnutt@nuttx.org>
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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 <stdlib.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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/****************************************************************************
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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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/****************************************************************************
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* Public Functions
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****************************************************************************/
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void parse_file(FILE *stream, struct variable_s **list)
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{
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struct variable_s *curr;
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struct variable_s *prev;
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struct variable_s *next;
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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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/* If the variable has not value (or the special value 'n'), then
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* ignore it.
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*/
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if (!varval || strcmp(varval, "n") == 0)
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{
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continue;
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}
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/* Make sure that a variable name was found. */
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if (varname)
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{
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int varlen = strlen(varname) + 1;
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int vallen = 0;
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/* Get the size of the value, including the NUL terminating
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* character.
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*/
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if (varval)
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{
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vallen = strlen(varval) + 1;
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}
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/* Allocate memory to hold the struct variable_s with the
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* variable name and the value.
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*/
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curr = (struct variable_s *)malloc(sizeof(struct variable_s) + varlen + vallen - 1);
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if (curr)
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{
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/* Add the variable to the list */
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curr->var = &curr->storage[0];
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strcpy(curr->var, varname);
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curr->val = NULL;
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if (varval)
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{
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curr->val = &curr->storage[varlen];
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strcpy(curr->val, varval);
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}
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}
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prev = 0;
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next = *list;
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while (next && strcmp(next->var, curr->var) <= 0)
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{
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prev = next;
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next = next->flink;
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}
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if (prev)
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{
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prev->flink = curr;
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}
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else
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{
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*list = curr;
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}
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curr->flink = next;
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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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struct variable_s *find_variable(const char *varname, struct variable_s *list)
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{
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while (list)
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{
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if (strcmp(varname, list->var) == 0)
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{
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return list;
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}
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list = list->flink;
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}
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return NULL;
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}
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