# wctob.m4 serial 11

dnl Copyright (C) 2008-2019 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_WCTOB],

[

  AC_REQUIRE([gl_WCHAR_H_DEFAULTS])

  AC_CHECK_FUNCS_ONCE([wctob])

  if test $ac_cv_func_wctob = no; then

    HAVE_WCTOB=0

    HAVE_DECL_WCTOB=0

  else

    HAVE_WCTOB=1

    dnl Solaris 9 has the wctob() function but it does not work.

    dnl Cygwin 1.7.2 has the wctob() function but it clobbers caller-owned

    dnl registers, see <https://cygwin.com/ml/cygwin/2010-05/msg00015.html>.

    AC_REQUIRE([AC_PROG_CC])

    AC_REQUIRE([gt_LOCALE_FR])

    AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles

    AC_CACHE_CHECK([whether wctob works],

      [gl_cv_func_wctob_works],

      [

        dnl Initial guess, used when cross-compiling or when no suitable locale

        dnl is present.

changequote(,)dnl

        case "$host_os" in

            # Guess no on Solaris <= 9 and Cygwin.

          solaris2.[1-9] | solaris2.[1-9].* | cygwin*)

            gl_cv_func_wctob_works="guessing no" ;;

            # Guess no on native Windows.

          mingw*)

            gl_cv_func_wctob_works="guessing no" ;;

            # Guess yes otherwise.

          *) gl_cv_func_wctob_works="guessing yes" ;;

        esac

changequote([,])dnl

        case "$host_os" in

          cygwin*)

            AC_RUN_IFELSE(

              [AC_LANG_SOURCE([[

#include <locale.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>

register long global __asm__ ("%ebx");

int main ()

{

  setlocale (LC_ALL, "en_US.UTF-8");

  global = 0x12345678;

  if (wctob (0x00FC) != -1)

    return 1;

  if (global != 0x12345678)

    return 2;

  return 0;

}]])],

              [:],

              [gl_cv_func_wctob_works=no],

              [:])

            ;;

        esac

        if test "$gl_cv_func_wctob_works" != no && test $LOCALE_FR != none; then

          AC_RUN_IFELSE(

            [AC_LANG_SOURCE([[

#include <locale.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>

int main ()

{

  if (setlocale (LC_ALL, "$LOCALE_FR") != NULL)

    {

      wchar_t wc;

      if (mbtowc (&wc, "\374", 1) == 1)

        if (wctob (wc) != (unsigned char) '\374')

          return 1;

    }

  return 0;

}]])],

            [gl_cv_func_wctob_works=yes],

            [gl_cv_func_wctob_works=no],

            [:])

        fi

      ])

    case "$gl_cv_func_wctob_works" in

      *yes) ;;

      *) REPLACE_WCTOB=1 ;;

    esac

    if test $REPLACE_WCTOB = 0; then

      dnl IRIX 6.5 has the wctob() function but does not declare it.

      AC_CHECK_DECLS([wctob], [], [], [[

/* 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_wctob != yes; then

        HAVE_DECL_WCTOB=0

      fi

    fi

  fi

])

# Prerequisites of lib/wctob.c.

AC_DEFUN([gl_PREREQ_WCTOB], [

  :

])