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Autoconf Macro: dps_snprintf_oflow
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<h1>
dps_snprintf_oflow
</h1>
<h2>
Synopsis
</h2>
<p class="indent" style="white-space:nowrap;">
<code>dps_snprintf_oflow</code>
</p>
<h2>
Description
</h2>
<div class="indent">
<p>
Checks whether snprintf ignores the value of n or not and defines
HAVE_SNPRINTF_BUG if it does.
</p>
</div>
<h2>
Author
</h2>
<p class="indent">
Duncan Simpson <dps@simpson.demon.co.uk>
</p>
<h2>
Last Modified
</h2>
<p class="indent">
2006-10-22
</p>
<h2>
M4 Source Code
</h2>
<div class="indent">
<pre class="m4source">
AC_DEFUN([dps_snprintf_oflow],
[AC_MSG_CHECKING(whether snprintf ignores n)
AC_CACHE_VAL(dps_cv_snprintf_bug,
[AC_TRY_RUN(
changequote(<<, >>)dnl
<<#include <stdio.h>
#ifndef HAVE_SNPRINTF
#ifdef HAVE_VSNPRINTF
#include "vsnprintf.h"
#else /* not HAVE_VSNPRINTF */
#include "vsnprintf.c"
#endif /* HAVE_VSNPRINTF */
#endif /* HAVE_SNPRINTF */
int main(void)
{
char ovbuf[7];
int i;
for (i=0; i<7; i++) ovbuf[i]='x';
snprintf(ovbuf, 4,"foo%s", "bar");
if (ovbuf[5]!='x') exit(1);
snprintf(ovbuf, 4,"foo%d", 666);
if (ovbuf[5]!='x') exit(1);
exit(0);
} >>
changequote([, ]), dps_cv_snprintf_bug=0, dps_cv_snprintf_bug=1,
dps_cv_snprintf_bug=2)])
if test $dps_cv_snprintf_bug -eq 0; then
AC_MSG_RESULT([no, snprintf is ok])
else if test $dps_cv_snprintf_bug -eq 1; then
AC_MSG_RESULT([yes, snprintf is broken])
AC_DEFINE(HAVE_SNPRINTF_BUG,1)
else
AC_MSG_RESULT([unknown, assuming yes])
AC_DEFINE(HAVE_SNPRINTF_BUG,1)
fi; fi])
</pre>
</div>
<h2>
License
</h2>
<div class="indent">
<span style="white-space:nowrap;">Copyright © 2006 Duncan Simpson
<dps@simpson.demon.co.uk></span>
<p>
Copying and distribution of this file, with or without modification, are
permitted in any medium without royalty provided the copyright notice and
this notice are preserved.
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