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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html lang="en">
<head>
<title>Autoconf Macro: ac_func_snprintf</title>
<link rel="stylesheet" type="text/css" href="ac-archive.css">
</head>
<body>
<table summary="web navigation" style="width:100%;">
<tbody>
<tr>
<td style="width:50%;" align="center">[<a href="index.html">Macro Index
Page</a>]</td>
<td style="width:50%;" align="center">[<a href=
"../m4source/ac_func_snprintf.m4">Download M4 Source</a>]</td>
</tr>
</tbody>
</table>
<hr>
<h1>ac_func_snprintf</h1>
<h2>Synopsis</h2>
<div class="indent">
<p style="text-align:left; white-space:nowrap;">
<code>AC_FUNC_SNPRINTF</code></p>
</div>
<h2>Description</h2>
<div class="indent">
<p>Checks for a fully C99 compliant snprintf, in particular checks whether
it does bounds checking and returns the correct string length; does the
same check for vsnprintf. If no working snprintf or vsnprintf is found,
request a replacement and warn the user about it. Note: the mentioned
replacement is freely available and may be used in any project regardless
of it's licence (just like the autoconf special exemption).</p>
</div>
<h2>Version</h2>
<div class="indent">
<p>1.4 (last modified: 2002-09-26)</p>
</div>
<h2>Author</h2>
<div class="indent">
<p>Rdiger Kuhlmann <info@ruediger-kuhlmann.de></p>
</div>
<h2>M4 Source Code</h2>
<div class="indent">
<pre class="m4source">
AC_DEFUN([AC_FUNC_SNPRINTF],
[AC_CHECK_FUNCS(snprintf vsnprintf)
AC_MSG_CHECKING(for working snprintf)
AC_CACHE_VAL(ac_cv_have_working_snprintf,
[AC_TRY_RUN(
[#include <stdio.h>
int main(void)
{
char bufs[5] = { 'x', 'x', 'x', '\0', '\0' };
char bufd[5] = { 'x', 'x', 'x', '\0', '\0' };
int i;
i = snprintf (bufs, 2, "%s", "111");
if (strcmp (bufs, "1")) exit (1);
if (i != 3) exit (1);
i = snprintf (bufd, 2, "%d", 111);
if (strcmp (bufd, "1")) exit (1);
if (i != 3) exit (1);
exit(0);
}], ac_cv_have_working_snprintf=yes, ac_cv_have_working_snprintf=no, ac_cv_have_working_snprintf=cross)])
AC_MSG_RESULT([$ac_cv_have_working_snprintf])
AC_MSG_CHECKING(for working vsnprintf)
AC_CACHE_VAL(ac_cv_have_working_vsnprintf,
[AC_TRY_RUN(
[#include <stdio.h>
#include <stdarg.h>
int my_vsnprintf (char *buf, const char *tmpl, ...)
{
int i;
va_list args;
va_start (args, tmpl);
i = vsnprintf (buf, 2, tmpl, args);
va_end (args);
return i;
}
int main(void)
{
char bufs[5] = { 'x', 'x', 'x', '\0', '\0' };
char bufd[5] = { 'x', 'x', 'x', '\0', '\0' };
int i;
i = my_vsnprintf (bufs, "%s", "111");
if (strcmp (bufs, "1")) exit (1);
if (i != 3) exit (1);
i = my_vsnprintf (bufd, "%d", 111);
if (strcmp (bufd, "1")) exit (1);
if (i != 3) exit (1);
exit(0);
}], ac_cv_have_working_vsnprintf=yes, ac_cv_have_working_vsnprintf=no, ac_cv_have_working_vsnprintf=cross)])
AC_MSG_RESULT([$ac_cv_have_working_vsnprintf])
if test x$ac_cv_have_working_snprintf$ac_cv_have_working_vsnprintf != "xyesyes"; then
AC_LIBOBJ(snprintf)
AC_MSG_WARN([Replacing missing/broken (v)snprintf() with version from http://www.ijs.si/software/snprintf/.])
AC_DEFINE(PREFER_PORTABLE_SNPRINTF, 1, "enable replacement (v)snprintf if system (v)snprintf is broken")
fi])
</pre>
</div>
<h2>Copyright</h2>
<div class="indent">
<a href="COPYING.html">GNU General Public License</a> with this special
<a href="COPYING-Exception.html">exception</a>.
</div>
</body>
</html>
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