Old useful C header

bail.h

/**
 * bail.h supplies the macro bail( expr, s ); "no description, read the code"
 * version 1.0
 * Copyright (C) 2008, Koen Bollen
 *
 * 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 version 2.
 *
 * 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.
 *
 * http://www.gnu.org/licenses/gpl.txt
 */
#ifdef BAIL_H
# undef BAIL_H
# undef bail
#endif /* BAIL_H */
#define BAIL_H 1

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#ifdef NDEBUG
# define bail( expr, s ) \
	if( expr ) { \
		fprintf( stderr, "error: %s: %s\n", s, strerror( errno ) ); \
		exit( 1 ); \
	}
#else /* NDEBUG */
# define bail( expr, s ) \
	if( expr ) { \
		fprintf( stderr, "%s:%d: %s: %s ( %s )\n", __FILE__, __LINE__, s, strerror( errno ), #expr ); \
		exit( 1 ); \
	}
#endif /* NDEBUG */