# mbswidth.m4 serial 18

dnl Copyright (C) 2000-2002, 2004, 2006-2018 Free Software Foundation, Inc.

dnl This file is free software; the Free Software Foundation

dnl gives unlimited permission to copy and/or distribute it,

dnl with or without modifications, as long as this notice is preserved.

dnl autoconf tests required for use of mbswidth.c

dnl From Bruno Haible.

AC_DEFUN([gl_MBSWIDTH],

[

  AC_CHECK_HEADERS_ONCE([wchar.h])

  AC_CHECK_FUNCS_ONCE([isascii mbsinit])

  dnl UnixWare 7.1.1 <wchar.h> has a declaration of a function mbswidth()

  dnl that clashes with ours.

  AC_CACHE_CHECK([whether mbswidth is declared in <wchar.h>],

    [ac_cv_have_decl_mbswidth],

    [AC_COMPILE_IFELSE(

       [AC_LANG_PROGRAM(

          [[

/* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before

   <wchar.h>.

   BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be included

   before <wchar.h>.  */

#include <stddef.h>

#include <stdio.h>

#include <time.h>

#include <wchar.h>

          ]],

          [[

  char *p = (char *) mbswidth;

  return !p;

          ]])],

       [ac_cv_have_decl_mbswidth=yes],

       [ac_cv_have_decl_mbswidth=no])])

  if test $ac_cv_have_decl_mbswidth = yes; then

    ac_val=1

  else

    ac_val=0

  fi

  AC_DEFINE_UNQUOTED([HAVE_DECL_MBSWIDTH_IN_WCHAR_H], [$ac_val],

    [Define to 1 if you have a declaration of mbswidth() in <wchar.h>, and to 0 otherwise.])

  AC_TYPE_MBSTATE_T

])