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/* Copyright (C) 2000  Free Software Foundation.

   If the argument to va_end() has side effects, test whether side

   effects from that argument are honored.

   Written by Kaveh R. Ghazi, 10/31/2000.  */

#include <stdarg.h>

#include <stdio.h>

#include <stdlib.h>

#ifndef __GNUC__

#define __attribute__(x)

#endif

static void __attribute__ ((__format__ (__printf__, 1, 2)))

doit (const char *s, ...)

{

  va_list *ap_array[3], **ap_ptr = ap_array;

  ap_array[0] = malloc (sizeof(va_list));

  ap_array[1] = NULL;

  ap_array[2] = malloc (sizeof(va_list));

  va_start (*ap_array[0], s);

  vprintf (s, **ap_ptr);

  /* Increment the va_list pointer once.  */

  va_end (**ap_ptr++);

  /* Increment the va_list pointer a second time.  */

  ap_ptr++;

  va_start (*ap_array[2], s);

  /* If we failed to increment ap_ptr twice, then the parameter passed

     in here will dereference NULL and should cause a crash.  */

  vprintf (s, **ap_ptr);

  va_end (**ap_ptr);

  /* Just in case, If *ap_ptr is NULL abort anyway.  */

  if (*ap_ptr == 0)

    abort();

}

int main()

{

  doit ("%s", "hello world\n");

  exit (0);

}