1------------------------------------------------------------------------------ 2-- -- 3-- GNAT RUNTIME COMPONENTS -- 4-- -- 5-- S Y S T E M . W I D _ W C H A R -- 6-- -- 7-- B o d y -- 8-- -- 9-- Copyright (C) 1992-1998 Free Software Foundation, Inc. -- 10-- -- 11-- GNAT is free software; you can redistribute it and/or modify it under -- 12-- terms of the GNU General Public License as published by the Free Soft- -- 13-- ware Foundation; either version 2, or (at your option) any later ver- -- 14-- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- 15-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- 16-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- 17-- for more details. You should have received a copy of the GNU General -- 18-- Public License distributed with GNAT; see file COPYING. If not, write -- 19-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, -- 20-- MA 02111-1307, USA. -- 21-- -- 22-- As a special exception, if other files instantiate generics from this -- 23-- unit, or you link this unit with other files to produce an executable, -- 24-- this unit does not by itself cause the resulting executable to be -- 25-- covered by the GNU General Public License. This exception does not -- 26-- however invalidate any other reasons why the executable file might be -- 27-- covered by the GNU Public License. -- 28-- -- 29-- GNAT was originally developed by the GNAT team at New York University. -- 30-- Extensive contributions were provided by Ada Core Technologies Inc. -- 31-- -- 32------------------------------------------------------------------------------ 33 34with System.WCh_Con; use System.WCh_Con; 35 36package body System.Wid_WChar is 37 38 -------------------------- 39 -- Width_Wide_Character -- 40 -------------------------- 41 42 function Width_Wide_Character 43 (Lo, Hi : Wide_Character; 44 EM : WC_Encoding_Method) 45 return Natural 46 is 47 W : Natural; 48 P : Natural; 49 50 begin 51 W := 0; 52 53 for C in Lo .. Hi loop 54 P := Wide_Character'Pos (C); 55 56 -- Here if we find a character in wide character range 57 58 if P > 16#FF# then 59 60 case EM is 61 62 when WCEM_Hex => 63 return Natural'Max (W, 5); 64 65 when WCEM_Upper => 66 return Natural'Max (W, 2); 67 68 when WCEM_Shift_JIS => 69 return Natural'Max (W, 2); 70 71 when WCEM_EUC => 72 return Natural'Max (W, 2); 73 74 when WCEM_UTF8 => 75 if Hi > Wide_Character'Val (16#07FF#) then 76 return Natural'Max (W, 3); 77 else 78 return Natural'Max (W, 2); 79 end if; 80 81 when WCEM_Brackets => 82 return Natural'Max (W, 8); 83 84 end case; 85 86 -- If we are in character range then use length of character image 87 88 else 89 declare 90 S : constant String := Character'Image (Character'Val (P)); 91 begin 92 W := Natural'Max (W, S'Length); 93 end; 94 end if; 95 end loop; 96 97 return W; 98 end Width_Wide_Character; 99 100end System.Wid_WChar; 101