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Diffstat (limited to 'gcc/ada/s-widwch.adb')
| -rw-r--r-- | gcc/ada/s-widwch.adb | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/gcc/ada/s-widwch.adb b/gcc/ada/s-widwch.adb new file mode 100644 index 00000000000..4c6b8ef6a34 --- /dev/null +++ b/gcc/ada/s-widwch.adb @@ -0,0 +1,102 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT RUNTIME COMPONENTS -- +-- -- +-- S Y S T E M . W I D _ W C H A R -- +-- -- +-- B o d y -- +-- -- +-- $Revision: 1.10 $ -- +-- -- +-- Copyright (C) 1992-1998 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- -- +-- ware Foundation; either version 2, or (at your option) any later ver- -- +-- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- +-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- +-- 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. -- +-- -- +-- As a special exception, if other files instantiate generics from this -- +-- unit, or you link this unit with other files to produce an executable, -- +-- this unit does not by itself cause the resulting executable to be -- +-- covered by the GNU General Public License. This exception does not -- +-- however invalidate any other reasons why the executable file might be -- +-- covered by the GNU Public License. -- +-- -- +-- 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 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); + + -- Here if we find a character in wide character range + + if P > 16#FF# then + + case EM is + + when WCEM_Hex => + return Natural'Max (W, 5); + + when WCEM_Upper => + return Natural'Max (W, 2); + + when WCEM_Shift_JIS => + return Natural'Max (W, 2); + + when WCEM_EUC => + return Natural'Max (W, 2); + + when WCEM_UTF8 => + if Hi > Wide_Character'Val (16#07FF#) then + return Natural'Max (W, 3); + else + return Natural'Max (W, 2); + end if; + + when WCEM_Brackets => + return Natural'Max (W, 8); + + end case; + + -- If we are in character range then use length of character image + + else + declare + S : constant 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; |