File : s-wwdenu.adb


------------------------------------------------------------------------------
--                                                                          --
--                         GNAT RUNTIME COMPONENTS                          --
--                                                                          --
--                      S Y S T E M . W W D _ E N U M                       --
--                                                                          --
--                                 S p e c                                  --
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--                            $Revision: 1.6 $                              --
--                                                                          --
--     Copyright (C) 1992,1993,1994,1995 Free Software Foundation, Inc.     --
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-- GNAT was originally developed  by the GNAT team at  New York University. --
-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
--                                                                          --
------------------------------------------------------------------------------

with Unchecked_Conversion;

with System.WCh_StW; use System.WCh_StW;
with System.WCh_Con; use System.WCh_Con;

package body System.WWd_Enum is

   ----------------------------
   -- Wide_Width_Enumeration --
   ----------------------------

   function Wide_Width_Enumeration
     (Table  : Address;
      Lo, Hi : Natural;
      EM     : WC_Encoding_Method)
      return   Natural
   is
      type String_Access is access String;
      for String_Access'Size use Standard'Address_Size;
      type Enum_Table is array (Natural) of String_Access;
      type Enum_Table_Ptr is access Enum_Table;
      function A_To_T is new Unchecked_Conversion (Address, Enum_Table_Ptr);

      T : constant Enum_Table_Ptr := A_To_T (Table);
      W : Natural;

   begin
      W := 0;

      for J in Lo .. Hi loop
         declare
            WS : constant Wide_String :=
              String_To_Wide_String (T (J).all, EM);

         begin
            W := Natural'Max (W, WS'Length);
         end;
      end loop;

      return W;
   end Wide_Width_Enumeration;

end System.WWd_Enum;