fprintf() test, from gettext-0.13.

diff --git a/m4/printf-posix.m4 b/m4/printf-posix.m4
new file mode 100644 (file)
index 0000000..cd6e40b
--- /dev/null
+++ b/m4/printf-posix.m4
@@ -0,0 +1,46 @@
+# printf-posix.m4 serial 1 (gettext-0.13)
+dnl Copyright (C) 2003 Free Software Foundation, Inc.
+dnl This file is free software, distributed under the terms of the GNU
+dnl General Public License.  As a special exception to the GNU General
+dnl Public License, this file may be distributed as part of a program
+dnl that contains a configuration script generated by Autoconf, under
+dnl the same distribution terms as the rest of that program.
+
+dnl From Bruno Haible.
+dnl Test whether the printf() function supports POSIX/XSI format strings with
+dnl positions.
+
+AC_DEFUN([gt_PRINTF_POSIX],
+[
+  AC_REQUIRE([AC_PROG_CC])
+  AC_CACHE_CHECK([whether printf() supports POSIX/XSI format strings],
+    gt_cv_func_printf_posix,
+    [
+      AC_TRY_RUN([
+#include <stdio.h>
+#include <string.h>
+/* The string "%2$d %1$d", with dollar characters protected from the shell's
+   dollar expansion (possibly an autoconf bug).  */
+static char format[] = { '%', '2', '$', 'd', ' ', '%', '1', '$', 'd', '\0' };
+static char buf[100];
+int main ()
+{
+  sprintf (buf, format, 33, 55);
+  return (strcmp (buf, "55 33") != 0);
+}], gt_cv_func_printf_posix=yes, gt_cv_func_printf_posix=no,
+      [
+        AC_EGREP_CPP(notposix, [
+#if defined __NetBSD__ || defined _MSC_VER || defined __MINGW32__
+  notposix
+#endif
+        ], gt_cv_func_printf_posix="guessing no",
+           gt_cv_func_printf_posix="guessing yes")
+      ])
+    ])
+  case $gt_cv_func_printf_posix in
+    *yes)
+      AC_DEFINE(HAVE_POSIX_PRINTF, 1,
+        [Define if your printf() function supports format strings with positions.])
+      ;;
+  esac
+])