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Re: Patch to projects.html: glibc's string function macros
- To: jsm28 at cam dot ac dot uk
- Subject: Re: Patch to projects.html: glibc's string function macros
- From: "Kaveh R. Ghazi" <ghazi at caip dot rutgers dot edu>
- Date: Tue, 31 Oct 2000 14:48:41 -0500 (EST)
- Cc: gcc-patches at gcc dot gnu dot org, mark at codesourcery dot com, rth at cygnus dot com
> From: "Joseph S. Myers" <jsm28@cam.ac.uk>
>
> On Mon, 30 Oct 2000, Kaveh R. Ghazi wrote:
>
> > Done and done. Since va_end isn't broken, I didn't bother with a
> > testcase.
>
> va_end was, however, broken in 2.95.2, which is a (weak) case for adding a
> testcase for it anyway.
Alright, here's a testcase that I'd like to install as
execute/va-arg-21.c. I've tested that it fails on hosts where va_end
is defined to "(void)0" like solaris2.7 cc and older gcc versions.
Ok to install?
--Kaveh
/* 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");
return 0;
}