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- ------------------------------------------------------------------------------
- -- --
- -- GNAT RUNTIME COMPONENTS --
- -- --
- -- S Y S T E M . W I D _ W C H A R --
- -- --
- -- B o d y --
- -- --
- -- $Revision: 1.6 $ --
- -- --
- -- Copyright (c) 1992,1993,1994,1995 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. --
- -- --
- ------------------------------------------------------------------------------
-
- with System.WCh_Con; use System.WCh_Con;
-
- package body System.Wid_WChar is
-
- --------------------------
- -- Width_Wide_Character --
- --------------------------
-
- function Width_Wide_Character
- (Lo, Hi : Wide_Character;
- EM : WC_Encoding_Method)
- 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, just use width of encoding
- -- sequence (currently a constant for all encoding methods) and
- -- we are done.
-
- if P > 255 then
- if EM = WCEM_Hex or else EM = WCEM_None then
- return Natural'Max (W, 5);
- else
- return Natural'Max (W, 2);
- end if;
-
- -- If we are in character range then use length of character image
-
- else
- declare
- S : String := Character'Image (Character'Val (P));
-
- begin
- W := Natural'Max (W, S'Length);
- end;
- end if;
- end loop;
-
- return W;
- end Width_Wide_Character;
-
- end System.Wid_WChar;
-