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/* client_config.c -- Handles reading and parsing of config files
*
* GPLv2 only - Copyright (C) 2008 - 2010
* 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 client_config.c
* @author David Sommerseth <dazo@users.sourceforge.net>
* @date 2008-12-01
*
* @brief Config file parser
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <assert.h>
#include <eurephia_nullsafe.h>
#include <eurephia_values.h>
/**
* Retrieve a the full path of a file name. Will try to look for the file in different places, like
* if EUREPHIA_DIR is set, it will look here or else in ${HOME}/.eurephia.
*
* @param env const char * to an environment variable to look for the given filename
* @param file File name which we are looking for
*
* @return Returns a full path to the file name, or NULL on error.
*/
char *get_config_filename(const char *env, const char *file) {
struct stat chk;
static char fname[1026];
char *ptr;
int flen = 1024 - strlen_nullsafe(file);
assert( (file != NULL));
memset(&fname, 0, 1026);
if( env != NULL ) {
// Use the explicit eurephia session file, if set in environment
if( (ptr = getenv(env)) != NULL ) {
snprintf(fname, 1024, "%s", ptr);
return fname;
}
}
// Use the explicit set eurephia session directory for a session file
if( ((ptr = getenv("EUREPHIA_DIR")) != NULL) && (strlen_nullsafe(ptr) <= 1016) ) {
strncat(fname, ptr, flen-1);
strcat(fname, "/");
strcat(fname, file);
// Make sure we have this directory
if( stat(ptr, &chk) == -1 ) {
if( mkdir(ptr, S_IRWXU) == -1 ) {
fprintf(stderr, "Could not create eurephia directory: %s\n", ptr);
return NULL;
}
}
return fname;
}
// Use default ~/.eurephia directory for session file
if( ((ptr = getenv("HOME")) != NULL) && (strlen_nullsafe(ptr) <= 1016) ) {
flen -= 10;
strncat(fname, ptr, flen);
strcat(fname, "/.eurephia");
// Make sure we have this directory
if( stat(fname, &chk) == -1 ) {
if( mkdir(fname, S_IRWXU) == -1 ) {
fprintf(stderr, "Could not create eurephia directory: %s\n", fname);
return NULL;
}
}
strcat(fname, "/");
strcat(fname, file);
return fname;
}
return NULL;
}
/**
* 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.
*/
eurephiaVALUES *parse_config_line(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(NULL, 20);
ret->key = strdup(key);
ret->val = strdup(val);
free_nullsafe(NULL, cp);
return ret;
}
/**
* Parses a complete config file and puts it into an eurephiaVALUES key/value stack
*
* @param env Environment table, used for locating the config file
* @param cfgname File name of the configuration file.
*
* @return Returns a pointer to an eurephiaVALUES stack containing the configuration on success,
* otherwise NULL.
*/
eurephiaVALUES *ReadConfig(const char *env, const char *cfgname) {
char *fname = NULL;
FILE *fp = NULL;
char *buf = NULL;
eurephiaVALUES *cfg = NULL;
struct stat fi;
fname = get_config_filename(env, cfgname);
if( fname == NULL ) {
fprintf(stderr, "Could not find a valid path for the config file\n");
return NULL;
}
if( stat(fname, &fi) == -1 ) {
fprintf(stderr, "Could not open the config file: %s\n", fname);
return NULL;
}
if( (fp = fopen(fname, "r")) == NULL ) {
fprintf(stderr, "Could not open the config file: %s\n", fname);
return NULL;
}
buf = (char *) malloc_nullsafe(NULL, fi.st_size+2);
cfg = eCreate_value_space(NULL, 20);
while( fgets(buf, fi.st_size, fp) != NULL ) {
eurephiaVALUES *prm = parse_config_line(buf);
if( prm != NULL ) {
eAdd_valuestruct(NULL, cfg, prm);
}
};
free_nullsafe(NULL, buf);
fclose(fp); fp = NULL;
return cfg;
}
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