/* common.h - Common definitions.
 *
 * Copyright (C) 1998 Oskar Liljeblad
 *
 * 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/>.
 */

#ifndef COMMON_COMMON_H
#define COMMON_COMMON_H

#define SWAP(a,b)	({ typeof(a) _t = (a); a = (b); (b) = _t; })

/* Variant of MIN which evaluates each parameter only once. */
#ifndef min
#define min(a,b)	({ typeof(a) _c = (a); typeof(b) _d = (b); MIN(_c,_d); })
#endif

/* Variant of MAX which evaluates each parameter only once. */
#ifndef max
#define max(a,b)	({ typeof(a) _c = (a); typeof(b) _d = (b); MAX(_c,_d); })
#endif

#define RETURN_IF_DIFFERENT(i1,i2) \
	{ \
		typeof(i1) a = i1; \
		typeof(i2) b = i2; \
		if (a != b) \
			return a-b; \
	}

#endif