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/*
* ini.c
*
* Copyright (c) 2013-2020 Pacman Development Team <pacman-dev@archlinux.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h> /* strdup */
#include "ini.h"
#include "util-common.h"
/**
* @brief Parse a pacman-style INI config file.
*
* @param file path to the config file
* @param cb callback for key/value pairs
* @param data caller defined data to be passed to the callback
*
* @return the callback return value
*
* @note The callback will be called at the beginning of each section with an
* empty key and value and for each key/value pair.
*
* @note If the parser encounters an error the callback will be called with
* section, key, and value set to NULL and errno set by fopen, fgets, or
* strdup.
*
* @note The @a key and @a value passed to @ cb will be overwritten between
* calls. The section name will remain valid until after @a cb is called to
* begin a new section.
*
* @note Parsing will immediately stop if the callback returns non-zero.
*/
int parse_ini(const char *file, ini_parser_fn cb, void *data)
{
char line[PATH_MAX], *section_name = NULL;
FILE *fp = NULL;
int linenum = 0;
int ret = 0;
fp = fopen(file, "r");
if(fp == NULL) {
return cb(file, 0, NULL, NULL, NULL, data);
}
while(safe_fgets(line, PATH_MAX, fp)) {
char *key, *value;
size_t line_len;
linenum++;
line_len = strtrim(line);
if(line_len == 0 || line[0] == '#') {
continue;
}
if(line[0] == '[' && line[line_len - 1] == ']') {
char *name;
/* new config section, skip the '[' */
name = strdup(line + 1);
name[line_len - 2] = '\0';
ret = cb(file, linenum, name, NULL, NULL, data);
free(section_name);
section_name = name;
/* we're at a new section; perform any post-actions for the prior */
if(ret) {
goto cleanup;
}
continue;
}
/* directive */
/* strsep modifies the 'line' string: 'key \0 value' */
key = line;
value = line;
strsep(&value, "=");
strtrim(key);
strtrim(value);
if((ret = cb(file, linenum, section_name, key, value, data)) != 0) {
goto cleanup;
}
}
cleanup:
fclose(fp);
free(section_name);
return ret;
}
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