config.h

/** \file
 * Key/value parser until we have a proper config.
 *
 * Auto-parsed variables will be assigned when read.
 * To create a configuration parameter:
 * <code>
 * CONFIG_INT( "name", variable, default_value );
 * CONFIG_STR( "name", variable, default_value );
 * </code>
 */
/*
 * Copyright (C) 2009 Trammell Hudson <hudson+ml@osresearch.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; 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, write to the
 * Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor,
 * Boston, MA  02110-1301, USA.
 */

#ifndef _config_h_
#define _config_h_

#define MAX_NAME_LEN		64
#define MAX_VALUE_LEN		60


struct config
{
	struct config *		next;
	char			name[ MAX_NAME_LEN ];
	char			value[ MAX_VALUE_LEN ];
};

extern struct config * global_config;

extern struct config *
config_parse(
	FILE *			file
);


extern char *
config_value(
	struct config *		config,
	const char *		name
);

extern int
config_int(
	struct config *		config,
	const char *		name,
	int			def
);


extern struct config *
config_parse_file(
	const char *		filename
);


extern int
config_save_file(
	struct config *		config,
	const char *		filename
);


/** Create an auto-parsed config variable */
struct config_var
{
	const char *		name;
	int			type;	//!< 0 == int, 1 == char *
	void *			value;	//!< int* if len == 0
};


#define _CONFIG_VAR( NAME, TYPE_ENUM, TYPE, VAR, VALUE ) \
static TYPE VAR = VALUE; \
struct config_var \
__attribute__((section(".config_vars"))) \
__config_##VAR = \
{ \
	.name		= NAME, \
	.type		= TYPE_ENUM, \
	.value		= &VAR, \
}

#define CONFIG_INT( NAME, VAR, VALUE ) \
	_CONFIG_VAR( NAME, 0, unsigned, VAR, VALUE )

#define CONFIG_STR( NAME, VAR, VALUE ) \
	_CONFIG_VAR( NAME, 1, char *, VAR, VALUE )


#endif