| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT RUNTIME COMPONENTS -- |
| -- -- |
| -- S Y S T E M . W C H _ W T S -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- $Revision: 1.13 $ -- |
| -- -- |
| -- Copyright (C) 1992-2000 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 Interfaces; use Interfaces; |
| with System.WCh_Con; use System.WCh_Con; |
| with System.WCh_JIS; use System.WCh_JIS; |
| |
| package body System.WCh_WtS is |
| |
| --------------------------- |
| -- Wide_String_To_String -- |
| --------------------------- |
| |
| function Wide_String_To_String |
| (S : Wide_String; |
| EM : WC_Encoding_Method) |
| return String |
| is |
| R : String (1 .. 5 * S'Length); -- worst case length! |
| RP : Natural; |
| C1 : Character; |
| C2 : Character; |
| |
| begin |
| RP := 0; |
| |
| for SP in S'Range loop |
| declare |
| C : constant Wide_Character := S (SP); |
| CV : constant Unsigned_16 := Wide_Character'Pos (C); |
| Hex : constant array (Unsigned_16 range 0 .. 15) of Character := |
| "0123456789ABCDEF"; |
| |
| begin |
| if CV <= 127 then |
| RP := RP + 1; |
| R (RP) := Character'Val (CV); |
| |
| else |
| case EM is |
| |
| -- Hex ESC sequence encoding |
| |
| when WCEM_Hex => |
| if CV <= 16#FF# then |
| RP := RP + 1; |
| R (RP) := Character'Val (CV); |
| |
| else |
| R (RP + 1) := ASCII.ESC; |
| R (RP + 2) := Hex (Shift_Right (CV, 12)); |
| R (RP + 3) := Hex (Shift_Right (CV, 8) and 16#000F#); |
| R (RP + 4) := Hex (Shift_Right (CV, 4) and 16#000F#); |
| R (RP + 5) := Hex (CV and 16#000F#); |
| RP := RP + 5; |
| end if; |
| |
| -- Upper bit shift (internal code = external code) |
| |
| when WCEM_Upper => |
| R (RP + 1) := Character'Val (Shift_Right (CV, 8)); |
| R (RP + 2) := Character'Val (CV and 16#FF#); |
| RP := RP + 2; |
| |
| -- Upper bit shift (EUC) |
| |
| when WCEM_EUC => |
| JIS_To_EUC (C, C1, C2); |
| R (RP + 1) := C1; |
| R (RP + 2) := C2; |
| RP := RP + 2; |
| |
| -- Upper bit shift (Shift-JIS) |
| |
| when WCEM_Shift_JIS => |
| JIS_To_Shift_JIS (C, C1, C2); |
| R (RP + 1) := C1; |
| R (RP + 2) := C2; |
| RP := RP + 2; |
| |
| -- Upper bit shift (UTF-8) |
| |
| -- 16#0080#-16#07ff#: 2#110xxxxx# 2#10xxxxxx# |
| -- 16#0800#-16#ffff#: 2#1110xxxx# 2#10xxxxxx# 2#10xxxxxx# |
| |
| when WCEM_UTF8 => |
| if CV < 16#0800# then |
| R (RP + 1) := |
| Character'Val (2#11000000# or Shift_Right (CV, 6)); |
| R (RP + 2) := |
| Character'Val (2#10000000# or (CV and 2#00111111#)); |
| RP := RP + 2; |
| |
| else |
| R (RP + 1) := |
| Character'Val (2#11100000# or Shift_Right (CV, 12)); |
| R (RP + 2) := |
| Character'Val (2#10000000# or |
| (Shift_Right (CV, 6) and |
| 2#00111111#)); |
| R (RP + 3) := |
| Character'Val (2#10000000# or (CV and 2#00111111#)); |
| RP := RP + 3; |
| end if; |
| |
| -- Brackets encoding |
| |
| when WCEM_Brackets => |
| if CV <= 16#FF# then |
| RP := RP + 1; |
| R (RP) := Character'Val (CV); |
| |
| else |
| R (RP + 1) := '['; |
| R (RP + 2) := '"'; |
| R (RP + 3) := Hex (Shift_Right (CV, 12)); |
| R (RP + 4) := Hex (Shift_Right (CV, 8) and 16#000F#); |
| R (RP + 5) := Hex (Shift_Right (CV, 4) and 16#000F#); |
| R (RP + 6) := Hex (CV and 16#000F#); |
| R (RP + 7) := '"'; |
| R (RP + 8) := ']'; |
| RP := RP + 8; |
| end if; |
| |
| end case; |
| end if; |
| end; |
| end loop; |
| |
| return R (1 .. RP); |
| end Wide_String_To_String; |
| |
| end System.WCh_WtS; |
