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- ------------------------------------------------------------------------------
- -- --
- -- GNAT RUNTIME COMPONENTS --
- -- --
- -- S Y S T E M . W C H _ W T S --
- -- --
- -- B o d y --
- -- --
- -- $Revision: 1.7 $ --
- -- --
- -- 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;
- 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;
- B1 : Natural;
- B2 : Natural;
- C1 : Character;
- C2 : Character;
-
- begin
- RP := 0;
-
- for SP in S'Range loop
- declare
- C : constant Wide_Character := S (SP);
- CV : constant Natural := Wide_Character'Pos (C);
- Hex : constant array (0 .. 15) of Character := "0123456789ABCDEF";
-
- begin
- if CV <= 127
- or else (CV <= 255 and then EM = WCEM_Hex)
- then
- RP := RP + 1;
- R (RP) := Character'Val (CV);
-
- else
- B1 := CV / 256;
- B2 := CV mod 256;
-
- -- Hex ESC sequence encoding
-
- if EM = WCEM_Hex or else EM = WCEM_None then
- R (RP + 1) := Ascii.ESC;
- R (RP + 2) := Hex (B1 / 16);
- R (RP + 3) := Hex (B1 rem 16);
- R (RP + 4) := Hex (B2 / 16);
- R (RP + 5) := Hex (B2 rem 16);
- RP := RP + 5;
-
- -- Upper bit shift (internal code = external code)
-
- elsif EM = WCEM_Upper then
- C1 := Character'Val (B1);
- C2 := Character'Val (B2);
-
- -- Upper bit shift (EUC)
-
- elsif EM = WCEM_EUC then
- JIS_To_EUC (C, C1, C2);
-
- -- Upper bit shift (Shift-JIS)
-
- else -- EM = WCEM_Shift_JIS
- JIS_To_Shift_JIS (C, C1, C2);
- end if;
-
- R (RP + 1) := C1;
- R (RP + 2) := C2;
- RP := RP + 2;
- end if;
- end;
- end loop;
-
- return R (1 .. RP);
- end Wide_String_To_String;
-
- end System.WCh_WtS;
-