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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_func_snprintf.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_FUNC_SNPRINTF
#
# DESCRIPTION
#
# 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 license.
#
# LICENSE
#
# Copyright (c) 2008 Ruediger Kuhlmann <info@ruediger-kuhlmann.de>
#
# 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. This file is offered as-is, without any
# warranty.
#serial 8
AU_ALIAS([AC_FUNC_SNPRINTF], [AX_FUNC_SNPRINTF])
AC_DEFUN([AX_FUNC_SNPRINTF],
[AC_CHECK_FUNCS(snprintf vsnprintf)
AC_MSG_CHECKING(for working snprintf)
AC_CACHE_VAL(ac_cv_have_working_snprintf,
[AC_RUN_IFELSE([AC_LANG_SOURCE([[#include <stdio.h>
#include <stdlib.h>
#include <string.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([$ac_cv_have_working_snprintf])
AC_MSG_CHECKING(for working vsnprintf)
AC_CACHE_VAL(ac_cv_have_working_vsnprintf,
[AC_RUN_IFELSE([AC_LANG_SOURCE([[#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
int my_vsnprintf (char *buf, const char *tmpl, ...)
{
int i;
va_list args;
va_start (args, tmpl);
i = vsnprintf (buf, 2, tmpl, args);
va_end (args);
return i;
}
int main(void)
{
char bufs[5] = { 'x', 'x', 'x', '\0', '\0' };
char bufd[5] = { 'x', 'x', 'x', '\0', '\0' };
int i;
i = my_vsnprintf (bufs, "%s", "111");
if (strcmp (bufs, "1")) exit (1);
if (i != 3) exit (1);
i = my_vsnprintf (bufd, "%d", 111);
if (strcmp (bufd, "1")) exit (1);
if (i != 3) exit (1);
exit(0);
}]])],[ac_cv_have_working_vsnprintf=yes],[ac_cv_have_working_vsnprintf=no],[ac_cv_have_working_vsnprintf=cross])])
AC_MSG_RESULT([$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])
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