/*
 * Copyright (c) 1998, 1999, 2000, 2001
 *	Tama Communications Corporation
 *
 * This file is part of GNU GLOBAL.
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef STDC_HEADERS
#include <stdlib.h>
#endif

#include "die.h"
#include "dbop.h"
#include "defined.h"
#include "makepath.h"

static DBOP *dbop = NULL;

/*
 * Tag command that supports referenced tag must call this function
 * to decide whether or not the tag is defined.
 */
int
defined(const char *name)
{
	if (dbop == NULL) {
		const char *dbpath;

		/*
		 * gtags(1) set GTAGSDBPATH to the path GTAGS exist.
		 */
		if (!(dbpath = getenv("GTAGSDBPATH")))
			dbpath = ".";
		dbop = dbop_open(makepath(dbpath, "GTAGS", NULL), 0, 0, 0);
		if (dbop == NULL)
			die("'GTAGS' not found.");
	}
	if (dbop_get(dbop, name))
		return 1;
	return 0;
}