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-rw-r--r--m4/ac_func_snprintf.m473
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diff --git a/m4/ac_func_snprintf.m4 b/m4/ac_func_snprintf.m4
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-dnl From http://autoconf-archive.cryp.to/
-
-dnl @synopsis AC_FUNC_SNPRINTF
-dnl
-dnl Checks for a fully C99 compliant snprintf, in particular checks
-dnl whether it does bounds checking and returns the correct string
-dnl length; does the same check for vsnprintf. If no working snprintf
-dnl or vsnprintf is found, request a replacement and warn the user
-dnl about it. Note: the mentioned replacement is freely available and
-dnl may be used in any project regardless of it's licence (just like
-dnl the autoconf special exemption).
-dnl
-dnl @category C
-dnl @author Rüdiger Kuhlmann <info@ruediger-kuhlmann.de>
-dnl @version 2002-09-26
-dnl @license AllPermissive
-
-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([Will use fallback (v)snprintf() implementation.])
- AC_DEFINE(PREFER_PORTABLE_SNPRINTF, 1, "enable replacement (v)snprintf if system (v)snprintf is broken")
-fi])