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dnl Author: Rüdiger Kuhlmann <info@ruediger-kuhlmann.de>
dnl License:
dnl AllPermissive
dnl Copying and distribution of this file, with or without modification,
dnl are permitted in any medium without royalty provided the copyright
dnl notice and this notice are preserved. Users of this software should
dnl generally follow the principles of the MIT License includings its
dnl disclaimer.
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])
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