# wctype_h.m4 serial 20

dnl A placeholder for ISO C99 <wctype.h>, for platforms that lack it.

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.

dnl Written by Paul Eggert.

AC_DEFUN([gl_WCTYPE_H],

[

  AC_REQUIRE([gl_WCTYPE_H_DEFAULTS])

  AC_REQUIRE([AC_PROG_CC])

  AC_REQUIRE([AC_CANONICAL_HOST])

  AC_CHECK_FUNCS_ONCE([iswcntrl])

  if test $ac_cv_func_iswcntrl = yes; then

    HAVE_ISWCNTRL=1

  else

    HAVE_ISWCNTRL=0

  fi

  AC_SUBST([HAVE_ISWCNTRL])

  AC_REQUIRE([gt_TYPE_WINT_T])

  if test $gt_cv_c_wint_t = yes; then

    HAVE_WINT_T=1

  else

    HAVE_WINT_T=0

  fi

  AC_SUBST([HAVE_WINT_T])

  AC_REQUIRE([gl_TYPE_WINT_T_PREREQ])

  gl_CHECK_NEXT_HEADERS([wctype.h])

  if test $ac_cv_header_wctype_h = yes; then

    if test $ac_cv_func_iswcntrl = yes; then

      dnl Linux libc5 has an iswprint function that returns 0 for all arguments.

      dnl The other functions are likely broken in the same way.

      AC_CACHE_CHECK([whether iswcntrl works], [gl_cv_func_iswcntrl_works],

        [

          AC_RUN_IFELSE(

            [AC_LANG_SOURCE([[

               /* 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>

               #include <wctype.h>

               int main () { return iswprint ('x') == 0; }

            ]])],

            [gl_cv_func_iswcntrl_works=yes], [gl_cv_func_iswcntrl_works=no],

            [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stdlib.h>

                          #if __GNU_LIBRARY__ == 1

                          Linux libc5 i18n is broken.

                          #endif]], [])],

              [gl_cv_func_iswcntrl_works="guessing yes"],

              [gl_cv_func_iswcntrl_works="guessing no"])

            ])

        ])

    fi

    HAVE_WCTYPE_H=1

  else

    HAVE_WCTYPE_H=0

  fi

  AC_SUBST([HAVE_WCTYPE_H])

  case "$gl_cv_func_iswcntrl_works" in

    *yes) REPLACE_ISWCNTRL=0 ;;

    *)    REPLACE_ISWCNTRL=1 ;;

  esac

  AC_SUBST([REPLACE_ISWCNTRL])

  if test $HAVE_ISWCNTRL = 0 || test $REPLACE_ISWCNTRL = 1; then

    dnl Redefine all of iswcntrl, ..., iswxdigit in <wctype.h>.

    :

  fi

  if test $REPLACE_ISWCNTRL = 1; then

    REPLACE_TOWLOWER=1

  else

    AC_CHECK_FUNCS([towlower])

    if test $ac_cv_func_towlower = yes; then

      REPLACE_TOWLOWER=0

    else

      AC_CHECK_DECLS([towlower],,,

        [[/* 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_WCTYPE_H

          # include <wctype.h>

          #endif

        ]])

      if test $ac_cv_have_decl_towlower = yes; then

        dnl On Minix 3.1.8, the system's <wctype.h> declares towlower() and

        dnl towupper() although it does not have the functions. Avoid a

        dnl collision with gnulib's replacement.

        REPLACE_TOWLOWER=1

      else

        REPLACE_TOWLOWER=0

      fi

    fi

  fi

  AC_SUBST([REPLACE_TOWLOWER])

  if test $HAVE_ISWCNTRL = 0 || test $REPLACE_TOWLOWER = 1; then

    dnl Redefine towlower, towupper in <wctype.h>.

    :

  fi

  dnl We assume that the wctype() and iswctype() functions exist if and only

  dnl if the type wctype_t is defined in <wchar.h> or in <wctype.h> if that

  dnl exists.

  dnl HP-UX 11.00 declares all these in <wchar.h> and lacks <wctype.h>.

  AC_CACHE_CHECK([for wctype_t], [gl_cv_type_wctype_t],

    [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>

            #if HAVE_WCTYPE_H

            # include <wctype.h>

            #endif

            wctype_t a;

          ]],

          [[]])],

       [gl_cv_type_wctype_t=yes],

       [gl_cv_type_wctype_t=no])

    ])

  if test $gl_cv_type_wctype_t = no; then

    HAVE_WCTYPE_T=0

  fi

  dnl We assume that the wctrans() and towctrans() functions exist if and only

  dnl if the type wctrans_t is defined in <wctype.h>.

  AC_CACHE_CHECK([for wctrans_t], [gl_cv_type_wctrans_t],

    [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>

            #include <wctype.h>

            wctrans_t a;

          ]],

          [[]])],

       [gl_cv_type_wctrans_t=yes],

       [gl_cv_type_wctrans_t=no])

    ])

  if test $gl_cv_type_wctrans_t = no; then

    HAVE_WCTRANS_T=0

  fi

  dnl Check for declarations of anything we want to poison if the

  dnl corresponding gnulib module is not in use.

  gl_WARN_ON_USE_PREPARE([[

/* 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>.  */

#if !(defined __GLIBC__ && !defined __UCLIBC__)

# include <stddef.h>

# include <stdio.h>

# include <time.h>

# include <wchar.h>

#endif

#include <wctype.h>

    ]],

    [wctype iswctype wctrans towctrans

    ])

])

AC_DEFUN([gl_WCTYPE_MODULE_INDICATOR],

[

  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.

  AC_REQUIRE([gl_WCTYPE_H_DEFAULTS])

  gl_MODULE_INDICATOR_SET_VARIABLE([$1])

  dnl Define it also as a C macro, for the benefit of the unit tests.

  gl_MODULE_INDICATOR_FOR_TESTS([$1])

])

AC_DEFUN([gl_WCTYPE_H_DEFAULTS],

[

  GNULIB_ISWBLANK=0;    AC_SUBST([GNULIB_ISWBLANK])

  GNULIB_WCTYPE=0;      AC_SUBST([GNULIB_WCTYPE])

  GNULIB_ISWCTYPE=0;    AC_SUBST([GNULIB_ISWCTYPE])

  GNULIB_WCTRANS=0;     AC_SUBST([GNULIB_WCTRANS])

  GNULIB_TOWCTRANS=0;   AC_SUBST([GNULIB_TOWCTRANS])

  dnl Assume proper GNU behavior unless another module says otherwise.

  HAVE_ISWBLANK=1;      AC_SUBST([HAVE_ISWBLANK])

  HAVE_WCTYPE_T=1;      AC_SUBST([HAVE_WCTYPE_T])

  HAVE_WCTRANS_T=1;     AC_SUBST([HAVE_WCTRANS_T])

  REPLACE_ISWBLANK=0;   AC_SUBST([REPLACE_ISWBLANK])

])