nuclear@0: /*
nuclear@0: This file is part of dynwatch, a win32 system tray applet which
nuclear@0: updates automatically the dyndns entry of quake.gr.
nuclear@0: 
nuclear@0: Copyright (c) 2005 John Tsiombikas <nuclear@siggraph.org>
nuclear@0: 
nuclear@0: This program is free software; you can redistribute it and/or modify
nuclear@0: it under the terms of the GNU General Public License as published by
nuclear@0: the Free Software Foundation; either version 2 of the License, or
nuclear@0: (at your option) any later version.
nuclear@0: 
nuclear@0: This program is distributed in the hope that it will be useful,
nuclear@0: but WITHOUT ANY WARRANTY; without even the implied warranty of
nuclear@0: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
nuclear@0: GNU General Public License for more details.
nuclear@0: 
nuclear@0: You should have received a copy of the GNU General Public License
nuclear@0: along with this program; if not, write to the Free Software
nuclear@0: Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
nuclear@0: */
nuclear@0: #include <stdio.h>
nuclear@0: #include <string.h>
nuclear@0: #include <stdlib.h>
nuclear@0: #include <ctype.h>
nuclear@0: #include "config_parser.h"
nuclear@0: 
nuclear@0: /* state variables */
nuclear@0: static char sym_assign = '=';
nuclear@0: static char sym_comment = ';';
nuclear@0: static char max_line_len = 100;
nuclear@0: static char seperators[257] = " \t";
nuclear@0: static struct ConfigOption cfg_opt;
nuclear@0: 
nuclear@0: static char *config_file, *cfgptr;
nuclear@0: 
nuclear@0: void SetParserState(enum ParserState state, int value) {
nuclear@0: 	switch(state) {
nuclear@0: 	case PS_AssignmentSymbol:
nuclear@0: 		sym_assign = (char)value;
nuclear@0: 		break;
nuclear@0: 
nuclear@0: 	case PS_CommentSymbol:
nuclear@0: 		sym_comment = (char)value;
nuclear@0: 		break;
nuclear@0: 
nuclear@0: 	case PS_MaxLineLen:
nuclear@0: 		max_line_len = value;
nuclear@0: 		break;
nuclear@0: 
nuclear@0: 	case PS_Seperators:
nuclear@0: 		strncpy(seperators, (char*)value, 257);
nuclear@0: 		break;
nuclear@0: 	}
nuclear@0: }
nuclear@0: 
nuclear@0: int LoadConfigFile(const char *fname) {
nuclear@0: 	FILE *fp;
nuclear@0: 	int fsize;
nuclear@0: 	char *temp;
nuclear@0: 
nuclear@0: 	if(!fname) return -1;
nuclear@0: 	if(!(fp = fopen(fname, "r"))) return -1;
nuclear@0: 
nuclear@0: 	fseek(fp, 0, SEEK_END);
nuclear@0: 	fsize = ftell(fp);
nuclear@0: 	fseek(fp, 0, SEEK_SET);
nuclear@0: 
nuclear@0: 	if(!(temp = realloc(config_file, fsize))) return -1;
nuclear@0: 	config_file = temp;
nuclear@0: 
nuclear@0: 	cfgptr = config_file;
nuclear@0: 	temp = malloc(max_line_len + 1);
nuclear@0: 	while(fgets(temp, max_line_len, fp)) {
nuclear@0: 		char *ptr = temp;
nuclear@0: 
nuclear@0: 		if(*ptr == '\n') continue;	/* kill empty lines, they irritate the parser */
nuclear@0: 
nuclear@0: 		while(ptr && *ptr && *ptr != sym_comment) {
nuclear@0: 			if(!strchr(seperators, *ptr)) {	/* not a seperator */
nuclear@0: 				*cfgptr++ = *ptr;
nuclear@0: 			}
nuclear@0: 			ptr++;
nuclear@0: 		}
nuclear@0: 
nuclear@0: 		if(*ptr == sym_comment && ptr != temp) {
nuclear@0: 			*cfgptr++ = '\n';
nuclear@0: 		}
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	*cfgptr = 0;
nuclear@0: 
nuclear@0: 	memset(&cfg_opt, 0, sizeof(struct ConfigOption));
nuclear@0: 	cfgptr = config_file;
nuclear@0: 	free(temp);
nuclear@0: 	return 0;
nuclear@0: }
nuclear@0: 
nuclear@0: const struct ConfigOption *GetNextOption() {
nuclear@0: 	char *tmpbuf = malloc(max_line_len + 1);
nuclear@0: 	char *ptr = tmpbuf;
nuclear@0: 
nuclear@0: 	if(!(*cfgptr)) {
nuclear@0: 		free(tmpbuf);
nuclear@0: 		return 0;
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	while(*cfgptr != '\n') {
nuclear@0: 		*ptr++ = *cfgptr++;
nuclear@0: 	}
nuclear@0: 	*ptr = 0;
nuclear@0: 	cfgptr++;
nuclear@0: 
nuclear@0: 	if(!(ptr = strchr(tmpbuf, sym_assign))) {
nuclear@0: 		free(tmpbuf);
nuclear@0: 		return 0;
nuclear@0: 	}
nuclear@0: 	*ptr++ = 0;
nuclear@0: 
nuclear@0: 	cfg_opt.flags = 0;
nuclear@0: 
nuclear@0: 	cfg_opt.option = realloc(cfg_opt.option, strlen(tmpbuf) + 1);
nuclear@0: 	strcpy(cfg_opt.option, tmpbuf);
nuclear@0: 
nuclear@0: 	cfg_opt.str_value = realloc(cfg_opt.str_value, strlen(ptr) + 1);
nuclear@0: 	strcpy(cfg_opt.str_value, ptr);
nuclear@0: 
nuclear@0: 	if(isdigit(cfg_opt.str_value[0])) {
nuclear@0: 		cfg_opt.flags |= CFGOPT_INT;
nuclear@0: 		cfg_opt.int_value = atoi(cfg_opt.str_value);
nuclear@0: 		cfg_opt.flt_value = atof(cfg_opt.str_value);
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	free(tmpbuf);
nuclear@0: 	return &cfg_opt;
nuclear@0: }
nuclear@0: 
nuclear@0: void DestroyConfigParser() {
nuclear@0: 	if(cfg_opt.str_value) free(cfg_opt.str_value);
nuclear@0: 	if(cfg_opt.option) free(cfg_opt.option);
nuclear@0: 	if(config_file) free(config_file);
nuclear@0: }