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/* eurephia_cfgfile.c
*
* Simple generic ini-style config file parser
*
* GPLv2 only - Copyright (C) 2011
* David Sommerseth <dazo@users.sourceforge.net>
*
* 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; version 2
* of the License.
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
/**
* @file eurephia_cfgfile.c
* @author David Sommerseth <dazo@users.sourceforge.net>
* @date 2011-07-23
*
* @brief A simple, generic ini-style config file parser
*
*/
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <eurephia_nullsafe.h>
#include <eurephia_context.h>
#include <eurephia_log.h>
#include <eurephia_values.h>
/**
* Parse one single configuration line into a eurephiaVALUES key/value
* pair. It will also ignore comment lines, and also remove the
* comments on the line of the configuration line so that only the
* key/value information is extracted.
*
* @param line Input configuration line
*
* @return eurephiaVALUES pointer containing the parsed result. On
* error or if no valid config line was found, NULL is returned.
*/
static inline eurephiaVALUES *parse_config_line(eurephiaCTX *ctx, const char *line) {
char *cp = NULL, *key = NULL, *val = NULL, *ptr = NULL;
eurephiaVALUES *ret = NULL;
if( *line == '#' ) {
return NULL;
}
cp = strdup(line);
key = cp;
val = strpbrk(cp, "=");
if( val == NULL ) {
free_nullsafe(NULL, cp);
return NULL;
}
*val = '\0'; val++;
// Discard comments at the end of a line
if( (ptr = strpbrk(val, "#")) != NULL ) {
*ptr = '\0';
}
// Left trim
while( ((*key == 0x20) || (*key == 0x0A) || (*key == 0x0D)) ) {
key++;
}
while( ((*val == 0x20) || (*val == 0x0A) || (*val == 0x0D)) ) {
val++;
}
// Right trim
ptr = key + strlen_nullsafe(key) - 1;
while( ((*ptr == 0x20) || (*ptr == 0x0A) || (*ptr == 0x0D)) && (ptr > key) ) {
ptr--;
}
ptr++;
*ptr = '\0';
ptr = val + strlen_nullsafe(val) - 1;
while( ((*ptr == 0x20) || (*ptr == 0x0A) || (*ptr == 0x0D)) && (ptr > val) ) {
ptr--;
}
ptr++;
*ptr = '\0';
// Put key/value into a eurephiaVALUES struct and return it
ret = eCreate_value_space(ctx, 20);
ret->key = strdup(key);
ret->val = strdup(val);
free_nullsafe(ctx, cp);
return ret;
}
/**
* Parses a complete config file and puts it into an eurephiaVALUES
* key/value stack
*
* @param fname Complete file name with full path to the configuration
* file to parse
*
* @return Returns a pointer to an eurephiaVALUES stack containing the
* configuration on success, otherwise NULL.
*/
eurephiaVALUES *ecfg_ReadConfig(eurephiaCTX *ctx, const char *fname)
{
FILE *fp = NULL;
char *buf = NULL;
eurephiaVALUES *cfg = NULL;
struct stat fi;
if( stat(fname, &fi) == -1 ) {
eurephia_log(ctx, LOG_CRITICAL, 0,
"Could not open the config file: %s\n", fname);
return NULL;
}
if( (fp = fopen(fname, "r")) == NULL ) {
eurephia_log(ctx, LOG_CRITICAL, 0,
"Could not open the config file: %s\n", fname);
return NULL;
}
buf = (char *) malloc_nullsafe(ctx, fi.st_size+2);
cfg = eCreate_value_space(ctx, 20);
while( fgets(buf, fi.st_size, fp) != NULL ) {
eurephiaVALUES *prm = parse_config_line(ctx, buf);
if( prm != NULL ) {
eAdd_valuestruct(ctx, cfg, prm);
}
};
free_nullsafe(ctx, buf);
fclose(fp); fp = NULL;
return cfg;
}
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