49 lines
1.1 KiB
C
49 lines
1.1 KiB
C
/* Copyright (C) 2000 Free Software Foundation.
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If the argument to va_end() has side effects, test whether side
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effects from that argument are honored.
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Written by Kaveh R. Ghazi, 10/31/2000. */
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#ifndef __GNUC__
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#define __attribute__(x)
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#endif
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static void __attribute__ ((__format__ (__printf__, 1, 2)))
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doit (const char *s, ...)
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{
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va_list *ap_array[3], **ap_ptr = ap_array;
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ap_array[0] = malloc (sizeof(va_list));
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ap_array[1] = NULL;
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ap_array[2] = malloc (sizeof(va_list));
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va_start (*ap_array[0], s);
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vprintf (s, **ap_ptr);
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/* Increment the va_list pointer once. */
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va_end (**ap_ptr++);
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/* Increment the va_list pointer a second time. */
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ap_ptr++;
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va_start (*ap_array[2], s);
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/* If we failed to increment ap_ptr twice, then the parameter passed
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in here will dereference NULL and should cause a crash. */
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vprintf (s, **ap_ptr);
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va_end (**ap_ptr);
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/* Just in case, If *ap_ptr is NULL abort anyway. */
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if (*ap_ptr == 0)
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abort();
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}
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int main()
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{
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doit ("%s", "hello world\n");
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return 0;
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}
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