Listing 2

/*  _Assert function
 *  copyright (c) 1990 by P.J. Plauger
 */
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>

/* print assertion message and abort */
void _Assert(char *mesg)
   {
   fputs(mesg, stderr);
   fputs(" - assertion failed\n", stderr);
   abort();
   }