------------------------------------------------------------------------------ -- -- -- GNAT RUNTIME COMPONENTS -- -- -- -- S Y S T E M . W C H _ W T S -- -- -- -- B o d y -- -- -- -- -- -- 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;