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/*
* ini.c
*
* Copyright (c) 2013-2014 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 <glob.h>
#include <limits.h>
#include <string.h> /* strdup */
#include <alpm.h>
#include "ini.h"
#include "util.h"
static const int ini_max_recursion = 10;
/**
* @brief INI parser backend.
*
* @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
* @param section_name the name of the current section
* @param line buffer to read into, must be at least PATH_MAX long
* @param depth recursion depth, should initially be 0
*
* @return 0 on success, 1 on parsing errors, the callback return value
* otherwise
*/
static int _parse_ini(const char *file, ini_parser_fn cb, void *data,
char **section_name, char *line, int depth)
{
FILE *fp = NULL;
int linenum = 0;
int ret = 0;
if(depth >= ini_max_recursion) {
pm_printf(ALPM_LOG_ERROR,
_("config parsing exceeded max recursion depth of %d.\n"),
ini_max_recursion);
ret = 1;
goto cleanup;
}
pm_printf(ALPM_LOG_DEBUG, "config: attempting to read file %s\n", file);
fp = fopen(file, "r");
if(fp == NULL) {
pm_printf(ALPM_LOG_ERROR, _("config file %s could not be read: %s\n"),
file, strerror(errno));
ret = 1;
goto cleanup;
}
while(fgets(line, PATH_MAX, fp)) {
char *key, *value, *ptr;
size_t line_len;
linenum++;
/* ignore whole line and end of line comments */
if((ptr = strchr(line, '#'))) {
*ptr = '\0';
}
line_len = strtrim(line);
if(line_len == 0) {
continue;
}
if(line[0] == '[' && line[line_len - 1] == ']') {
char *name;
/* only possibility here is a line == '[]' */
if(line_len <= 2) {
pm_printf(ALPM_LOG_ERROR, _("config file %s, line %d: bad section name.\n"),
file, linenum);
ret = 1;
goto cleanup;
}
/* 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(key == NULL) {
pm_printf(ALPM_LOG_ERROR, _("config file %s, line %d: syntax error in config file- missing key.\n"),
file, linenum);
ret = 1;
goto cleanup;
}
/* Include is allowed in both options and repo sections */
if(strcmp(key, "Include") == 0) {
glob_t globbuf;
int globret;
size_t gindex;
if(value == NULL) {
pm_printf(ALPM_LOG_ERROR, _("config file %s, line %d: directive '%s' needs a value\n"),
file, linenum, key);
ret = 1;
goto cleanup;
}
/* Ignore include failures... assume non-critical */
globret = glob(value, GLOB_NOCHECK, NULL, &globbuf);
switch(globret) {
case GLOB_NOSPACE:
pm_printf(ALPM_LOG_DEBUG,
"config file %s, line %d: include globbing out of space\n",
file, linenum);
break;
case GLOB_ABORTED:
pm_printf(ALPM_LOG_DEBUG,
"config file %s, line %d: include globbing read error for %s\n",
file, linenum, value);
break;
case GLOB_NOMATCH:
pm_printf(ALPM_LOG_DEBUG,
"config file %s, line %d: no include found for %s\n",
file, linenum, value);
break;
default:
for(gindex = 0; gindex < globbuf.gl_pathc; gindex++) {
pm_printf(ALPM_LOG_DEBUG, "config file %s, line %d: including %s\n",
file, linenum, globbuf.gl_pathv[gindex]);
ret =_parse_ini(globbuf.gl_pathv[gindex], cb, data,
section_name, line, depth + 1);
if(ret) {
globfree(&globbuf);
goto cleanup;
}
}
break;
}
globfree(&globbuf);
continue;
}
if((ret = cb(file, linenum, *section_name, key, value, data)) != 0) {
goto cleanup;
}
}
if(depth == 0) {
ret = cb(NULL, 0, NULL, NULL, NULL, data);
}
cleanup:
if(fp) {
fclose(fp);
}
if(depth == 0) {
free(*section_name);
*section_name = NULL;
}
pm_printf(ALPM_LOG_DEBUG, "config: finished parsing %s\n", file);
return ret;
}
/**
* @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 0 on success, 1 on parsing errors, the callback return value
* otherwise
*
* @note The callback will be called at the beginning of each section with an
* empty key and value, for each key/value pair, and when parsing is complete
* with all arguments except @a data empty.
*
* @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 *section_name = NULL, line[PATH_MAX];
return _parse_ini(file, cb, data, §ion_name, line, 0);
}
/* vim: set ts=2 sw=2 noet: */
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