usr/src/admin/style/err

/*
 *      @(#)err 5.1 (Berkeley) %G%
 *
 * Error routines can be tricky.  The following works in most cases,
 * and can be easily adapted per program.  It allows both:
 *
 *      if ((fp = fopen(file, "r")) == NULL)
 *              err("%s: %s", file, strerror(errno));
 * and:
 *      if ((p = malloc(sizeof(int))) == NULL)
 *              err("%s", strerror(errno));
 *
 * Never use perror(3).
 */
#if __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif

void
#if __STDC__
err(const char *fmt, ...)
#else
err(fmt, va_alist)
        char *fmt;
        va_dcl
#endif
{
        va_list ap;
#if __STDC__
        va_start(ap, fmt);
#else
        va_start(ap);
#endif
        (void)fprintf(stderr, "program: ");
        (void)vfprintf(stderr, fmt, ap);
        va_end(ap);
        (void)fprintf(stderr, "\n");
        exit(1);
        /* NOTREACHED */
}