------------------------------------------------------------------------------
-- --
--- GNAT RUNTIME COMPONENTS --
+-- GNAT RUN-TIME COMPONENTS --
-- --
-- S Y S T E M . W W D _ W C H A R --
-- --
-- B o d y --
-- --
--- Copyright (C) 1992-2000, Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2005, 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- --
-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING. If not, write --
--- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, USA. --
+-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
+-- Boston, MA 02110-1301, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- --
------------------------------------------------------------------------------
+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
+ (Lo, Hi : Wide_Character) return Natural
is
- W : Natural;
- P : Natural;
+ LV : constant Unsigned_32 := Wide_Character'Pos (Lo);
+ HV : constant Unsigned_32 := Wide_Character'Pos (Hi);
begin
- W := 0;
+ -- Return zero if empty range
- for C in Lo .. Hi loop
- P := Wide_Character'Pos (C);
+ if LV > HV then
+ return 0;
- -- If we are in wide character range, the length is always 3
- -- and we are done, since all remaining characters are the same.
+ -- Return max value (12) for wide character (Hex_hhhhhhhh)
- if P > 255 then
- return Natural'Max (W, 3);
+ elsif HV > 255 then
+ return 12;
- -- If we are in character range then use length of character image
- -- Is this right, what about wide char encodings of 80-FF???
+ -- 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
- declare
- S : Wide_String := Character'Wide_Image (Character'Val (P));
+ 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;
- begin
- W := Natural'Max (W, S'Length);
- end;
- end if;
- end loop;
+ ------------------------------------
+ -- Wide_Width_Wide_Wide_Character --
+ ------------------------------------
- return W;
- end Wide_Width_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;
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