test-attribute.c

   1 /* $Id: test-attribute.c,v 1.1 2020/06/22 20:00:38 schwarze Exp $ */
   2 /*
   3  * Copyright (c) 2020 Ingo Schwarze <schwarze@openbsd.org>
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #include <stdarg.h>
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21
  22 void     var_arg(const char *, ...)
  23                 __attribute__((__format__ (__printf__, 1, 2)));
  24 void     no_ret(int)
  25                 __attribute__((__noreturn__));
  26
  27 void
  28 var_arg(const char *fmt, ...)
  29 {
  30         va_list  ap;
  31
  32         va_start(ap, fmt);
  33         vprintf(fmt, ap);
  34         va_end(ap);
  35 }
  36
  37 void
  38 no_ret(int i)
  39 {
  40         exit(i);
  41 }
  42
  43 int
  44 main(void)
  45 {
  46         var_arg("Test output: %d\n", 42);
  47         no_ret(0);
  48 }