usr/src/include/assert.h

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)assert.h    4.3 (Berkeley) %G%
 */

#ifdef NDEBUG
#define assert
#define _assert
#else
#define assert(expression) { \
        if (!(expression)) { \
                (void)fprintf(stderr, \
                    "assertion \"%s\" failed: file \"%s\", line %d\n", \
                    "expression", __FILE__, __LINE__); \
                exit(2); \
        } \
}
#define _assert(expression)     assert(expression)
#endif