+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNAT RUNTIME COMPONENTS --
--- --
--- S Y S T E M . W C H _ W T S --
--- --
--- B o d y --
--- --
--- $Revision: 1.1.16.2 $
--- --
--- 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. --
--- Extensive contributions were provided by Ada Core Technologies Inc. --
--- --
-------------------------------------------------------------------------------
-
-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;
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