m4/printf-posix.m4

   1 # printf-posix.m4 serial 6 (gettext-0.18.2)
   2 dnl Copyright (C) 2003, 2007, 2009-2019 Free Software Foundation, Inc.
   3 dnl This file is free software; the Free Software Foundation
   4 dnl gives unlimited permission to copy and/or distribute it,
   5 dnl with or without modifications, as long as this notice is preserved.
   6
   7 dnl From Bruno Haible.
   8 dnl Test whether the printf() function supports POSIX/XSI format strings with
   9 dnl positions.
  10
  11 AC_DEFUN([gt_PRINTF_POSIX],
  12 [
  13   AC_REQUIRE([AC_PROG_CC])
  14   AC_CACHE_CHECK([whether printf() supports POSIX/XSI format strings],
  15     gt_cv_func_printf_posix,
  16     [
  17       AC_RUN_IFELSE(
  18         [AC_LANG_SOURCE([[
  19 #include <stdio.h>
  20 #include <string.h>
  21 /* The string "%2$d %1$d", with dollar characters protected from the shell's
  22    dollar expansion (possibly an autoconf bug).  */
  23 static char format[] = { '%', '2', '$', 'd', ' ', '%', '1', '$', 'd', '\0' };
  24 static char buf[100];
  25 int main ()
  26 {
  27   sprintf (buf, format, 33, 55);
  28   return (strcmp (buf, "55 33") != 0);
  29 }]])],
  30         [gt_cv_func_printf_posix=yes],
  31         [gt_cv_func_printf_posix=no],
  32         [
  33           AC_EGREP_CPP([notposix], [
  34 #if defined __NetBSD__ || defined __BEOS__ || defined _MSC_VER || defined __MINGW32__ || defined __CYGWIN__
  35   notposix
  36 #endif
  37             ],
  38             [gt_cv_func_printf_posix="guessing no"],
  39             [gt_cv_func_printf_posix="guessing yes"])
  40         ])
  41     ])
  42   case $gt_cv_func_printf_posix in
  43     *yes)
  44       AC_DEFINE([HAVE_POSIX_PRINTF], [1],
  45         [Define if your printf() function supports format strings with positions.])
  46       ;;
  47   esac
  48 ])