/*
 *
 *  config.c
 *
 *       Copyright (C) Stan Seibert - July 2000
 *       Copyright (C) Monty - Mar 2010
 *
 *  This file is part of libao, a cross-platform audio output library.  See
 *  README for a history of this source code.
 *
 *  libao 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, or (at your option)
 *  any later version.
 *
 *  libao 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 GNU Make; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 ********************************************************************

 last mod: $Id$

 ********************************************************************/

#include "ao.h"
#include "ao_private.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <ctype.h>

#define LINE_LEN 100

static char *trim(char *p){
  char *t;
  while(*p && isspace(*p))p++;
  if(*p){
    t=p+strlen(p);
    while(t>p && isspace(*(t-1))){
      t--;
      *t='\0';
    }
  }
  return p;
}

static int ao_read_config_file(ao_config *config, const char *config_file)
{
	FILE *fp;
	char line[LINE_LEN];
	int end;

	if ( !(fp = fopen(config_file, "r")) )
		return 0; /* Can't open file */

	while (fgets(line, LINE_LEN, fp)) {
		/* All options are key=value, comments start with '#' */
		char *key=trim(line);
		if (key && *key && *key != '#') {
			char *val = strchr(key,'=');
			if (val) {
				*val = '\0';
				val++;
			}

			if (!strcmp(key, "default_driver")) {
				free(config->default_driver);
				config->default_driver = strdup(val?val:"");
			} else {
				/* entries in the config file that don't parse as
				   directives to AO at large are treated as driver
				   options */
				ao_append_global_option(key,val);
			}
		}
	}

	fclose(fp);

	return 1;
}

void ao_read_config_files (ao_config *config)
{
	char userfile[FILENAME_MAX+1];
	char *homedir = getenv("HOME");

	/* Read the system-wide config file */
	ao_read_config_file(config, AO_SYSTEM_CONFIG);

	/* Read the user config file */
	if ( homedir!=NULL &&
	     strlen(homedir) <= FILENAME_MAX - strlen(AO_USER_CONFIG) )
	{
		strncpy(userfile, homedir, FILENAME_MAX);
		strcat(userfile, AO_USER_CONFIG);
		ao_read_config_file(config, userfile);
	}
}