# wcwidth.m4 serial 27

dnl Copyright (C) 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.

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

    AC_CACHE_CHECK([whether wcwidth is a macro],

      [gl_cv_func_wcwidth_macro],

      [AC_EGREP_CPP([wchar_header_defines_wcwidth], [

#include <wchar.h>

#ifdef wcwidth

 wchar_header_defines_wcwidth

#endif],

         [gl_cv_func_wcwidth_macro=yes],

         [gl_cv_func_wcwidth_macro=no])

      ])

  fi

  if test $ac_cv_func_wcwidth = yes || test $gl_cv_func_wcwidth_macro = 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 On Solaris 8, wcwidth(0x2022) (BULLET) returns 2.

    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

   || setlocale (LC_ALL, "en_US.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;

      if (wcwidth (0x2022) != 1)

	result |= 16;

    }

  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* | 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.

])

# Prerequisites of lib/wcwidth.c.

AC_DEFUN([gl_PREREQ_WCWIDTH], [

  AC_REQUIRE([AC_C_INLINE])

  :

])