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1996-09-28
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3KB
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68 lines
------------------------------------------------------------------------------
-- --
-- GNAT RUNTIME COMPONENTS --
-- --
-- S Y S T E M . W W D _ W C H A R --
-- --
-- B o d y --
-- --
-- $Revision: 1.2 $ --
-- --
-- Copyright (c) 1992,1993,1994 NYU, All Rights Reserved --
-- --
-- The GNAT library is free software; you can redistribute it and/or modify --
-- it under terms of the GNU Library General Public License as published by --
-- the Free Software Foundation; either version 2, or (at your option) any --
-- later version. The GNAT library is distributed in the hope that it will --
-- be useful, but WITHOUT ANY WARRANTY; without even the implied warranty --
-- of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU --
-- Library General Public License for more details. You should have --
-- received a copy of the GNU Library General Public License along with --
-- the GNAT library; see the file COPYING.LIB. If not, write to the Free --
-- Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. --
-- --
------------------------------------------------------------------------------
package body System.WWd_WChar is
-------------------------------
-- Wide_Width_Wide_Character --
-------------------------------
function Wide_Width_Wide_Character
(Lo, Hi : Wide_Character)
return Natural
is
W : Natural;
P : Natural;
begin
W := 0;
for C in Lo .. Hi loop
P := Wide_Character'Pos (C);
-- If we are in wide character range, the length is always 3
-- and we are done, since all remaining characters are the same.
if P > 255 then
return Natural'Max (W, 3);
-- If we are in character range then use length of character image
-- Is this right, what about wide char encodings of 80-FF???
else
declare
S : Wide_String := Character'Wide_Image (Character'Val (P));
begin
W := Natural'Max (W, S'Length);
end;
end if;
end loop;
return W;
end Wide_Width_Wide_Character;
end System.WWd_WChar;