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------------------------------------------------------------------------------

--                                                                          --

--                         GNAT RUN-TIME COMPONENTS                         --

--                                                                          --

--                     S Y S T E M . W W D _ W C H A R                      --

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--          Copyright (C) 1992-2009, Free Software Foundation, Inc.         --

--                                                                          --

-- GNAT is free software;  you can  redistribute it  and/or modify it under --

-- terms of the  GNU General Public License as published  by the Free Soft- --

-- ware  Foundation;  either version 3,  or (at your option) any later ver- --

-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --

-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --

-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --

--                                                                          --

-- As a special exception under Section 7 of GPL version 3, you are granted --

-- additional permissions described in the GCC Runtime Library Exception,   --

-- version 3.1, as published by the Free Software Foundation.               --

--                                                                          --

-- You should have received a copy of the GNU General Public License and    --

-- a copy of the GCC Runtime Library Exception along with this program;     --

-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --

-- <http://www.gnu.org/licenses/>.                                          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

------------------------------------------------------------------------------

with Interfaces; use Interfaces;

with System.WWd_Char;

package body System.Wwd_WChar is

   ------------------------------------

   -- Wide_Wide_Width_Wide_Character --

   ------------------------------------

   --  This is the case where we are talking about the Wide_Wide_Image of

   --  a Wide_Character, which is always the same character sequence as the

   --  Wide_Image of the same Wide_Character.

   function Wide_Wide_Width_Wide_Character

     (Lo, Hi : Wide_Character) return Natural

   is

   begin

      return Wide_Width_Wide_Character (Lo, Hi);

   end Wide_Wide_Width_Wide_Character;

   ------------------------------------

   -- Wide_Wide_Width_Wide_Wide_Char --

   ------------------------------------

   function Wide_Wide_Width_Wide_Wide_Char

     (Lo, Hi : Wide_Wide_Character) return Natural

   is

      LV : constant Unsigned_32 := Wide_Wide_Character'Pos (Lo);

      HV : constant Unsigned_32 := Wide_Wide_Character'Pos (Hi);

   begin

      --  Return zero if empty range

      if LV > HV then

         return 0;

      --  Return max value (12) for wide character (Hex_hhhhhhhh)

      elsif HV > 255 then

         return 12;

      --  If any characters in normal character range, then use normal

      --  Wide_Wide_Width attribute on this range to find out a starting point.

      --  Otherwise start with zero.

      else

         return

           System.WWd_Char.Wide_Wide_Width_Character

             (Lo => Character'Val (LV),

              Hi => Character'Val (Unsigned_32'Min (255, HV)));

      end if;

   end Wide_Wide_Width_Wide_Wide_Char;

   -------------------------------

   -- Wide_Width_Wide_Character --

   -------------------------------

   function Wide_Width_Wide_Character

     (Lo, Hi : Wide_Character) return Natural

   is

      LV : constant Unsigned_32 := Wide_Character'Pos (Lo);

      HV : constant Unsigned_32 := Wide_Character'Pos (Hi);

   begin

      --  Return zero if empty range

      if LV > HV then

         return 0;

      --  Return max value (12) for wide character (Hex_hhhhhhhh)

      elsif HV > 255 then

         return 12;

      --  If any characters in normal character range, then use normal

      --  Wide_Wide_Width attribute on this range to find out a starting point.

      --  Otherwise start with zero.

      else

         return

           System.WWd_Char.Wide_Width_Character

             (Lo => Character'Val (LV),

              Hi => Character'Val (Unsigned_32'Min (255, HV)));

      end if;

   end Wide_Width_Wide_Character;

   ------------------------------------

   -- Wide_Width_Wide_Wide_Character --

   ------------------------------------

   function Wide_Width_Wide_Wide_Character

     (Lo, Hi : Wide_Wide_Character) return Natural

   is

   begin

      return Wide_Wide_Width_Wide_Wide_Char (Lo, Hi);

   end Wide_Width_Wide_Wide_Character;

end System.Wwd_WChar;