# wcwidth.m4 serial 23

dnl Copyright (C) 2006-2017 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.

AC_DEFUN([gl_FUNC_WCWIDTH],

[

  AC_REQUIRE([gl_WCHAR_H_DEFAULTS])

  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles

  dnl Persuade glibc <wchar.h> to declare wcwidth().

  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])

  AC_REQUIRE([gt_TYPE_WCHAR_T])

  AC_REQUIRE([gt_TYPE_WINT_T])

  AC_CHECK_HEADERS_ONCE([wchar.h])

  AC_CHECK_FUNCS_ONCE([wcwidth])

  AC_CHECK_DECLS([wcwidth], [], [], [[

/* AIX 3.2.5 declares wcwidth in <string.h>. */

#include <string.h>

/* 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>

]])

  if test $ac_cv_have_decl_wcwidth != yes; then

    HAVE_DECL_WCWIDTH=0

  fi

  if test $ac_cv_func_wcwidth = yes; then

    HAVE_WCWIDTH=1

    dnl On Mac OS X 10.3, wcwidth(0x0301) (COMBINING ACUTE ACCENT) returns 1.

    dnl On OpenBSD 5.0, wcwidth(0x05B0) (HEBREW POINT SHEVA) returns 1.

    dnl On OSF/1 5.1, wcwidth(0x200B) (ZERO WIDTH SPACE) returns 1.

    dnl On OpenBSD 5.8, wcwidth(0xFF1A) (FULLWIDTH COLON) returns 0.

    dnl This leads to bugs in 'ls' (coreutils).

    AC_CACHE_CHECK([whether wcwidth works reasonably in UTF-8 locales],

      [gl_cv_func_wcwidth_works],

      [

        AC_RUN_IFELSE(

          [AC_LANG_SOURCE([[

#include <locale.h>

/* AIX 3.2.5 declares wcwidth in <string.h>. */

#include <string.h>

/* 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>

#if !HAVE_DECL_WCWIDTH

extern

# ifdef __cplusplus

"C"

# endif

int wcwidth (int);

#endif

int main ()

{

  int result = 0;

  if (setlocale (LC_ALL, "fr_FR.UTF-8") != NULL)

    {

      if (wcwidth (0x0301) > 0)

        result |= 1;

      if (wcwidth (0x05B0) > 0)

        result |= 2;

      if (wcwidth (0x200B) > 0)

        result |= 4;

      if (wcwidth (0xFF1A) == 0)

        result |= 8;

    }

  return result;

}]])],

          [gl_cv_func_wcwidth_works=yes],

          [gl_cv_func_wcwidth_works=no],

          [

changequote(,)dnl

           case "$host_os" in

                     # Guess yes on glibc and AIX 7 systems.

             *-gnu* | aix[7-9]*) gl_cv_func_wcwidth_works="guessing yes";;

             *)                  gl_cv_func_wcwidth_works="guessing no";;

           esac

changequote([,])dnl

          ])

      ])

    case "$gl_cv_func_wcwidth_works" in

      *yes) ;;

      *no) REPLACE_WCWIDTH=1 ;;

    esac

  else

    HAVE_WCWIDTH=0

  fi

  dnl We don't substitute HAVE_WCWIDTH. We assume that if the system does not

  dnl have the wcwidth function, then it does not declare it.

])