1 ------------------------------------------------------------------------------
3 -- GNAT RUNTIME COMPONENTS --
5 -- S Y S T E M . W C H _ W T S --
10 -- Copyright (C) 1992-2000 Free Software Foundation, Inc. --
12 -- GNAT is free software; you can redistribute it and/or modify it under --
13 -- terms of the GNU General Public License as published by the Free Soft- --
14 -- ware Foundation; either version 2, or (at your option) any later ver- --
15 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
16 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
17 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
18 -- for more details. You should have received a copy of the GNU General --
19 -- Public License distributed with GNAT; see file COPYING. If not, write --
20 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
21 -- MA 02111-1307, USA. --
23 -- As a special exception, if other files instantiate generics from this --
24 -- unit, or you link this unit with other files to produce an executable, --
25 -- this unit does not by itself cause the resulting executable to be --
26 -- covered by the GNU General Public License. This exception does not --
27 -- however invalidate any other reasons why the executable file might be --
28 -- covered by the GNU Public License. --
30 -- GNAT was originally developed by the GNAT team at New York University. --
31 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
33 ------------------------------------------------------------------------------
35 with Interfaces; use Interfaces;
36 with System.WCh_Con; use System.WCh_Con;
37 with System.WCh_JIS; use System.WCh_JIS;
39 package body System.WCh_WtS is
41 ---------------------------
42 -- Wide_String_To_String --
43 ---------------------------
45 function Wide_String_To_String
47 EM : WC_Encoding_Method)
50 R : String (1 .. 5 * S'Length); -- worst case length!
58 for SP in S'Range loop
60 C : constant Wide_Character := S (SP);
61 CV : constant Unsigned_16 := Wide_Character'Pos (C);
62 Hex : constant array (Unsigned_16 range 0 .. 15) of Character :=
68 R (RP) := Character'Val (CV);
73 -- Hex ESC sequence encoding
78 R (RP) := Character'Val (CV);
81 R (RP + 1) := ASCII.ESC;
82 R (RP + 2) := Hex (Shift_Right (CV, 12));
83 R (RP + 3) := Hex (Shift_Right (CV, 8) and 16#000F#);
84 R (RP + 4) := Hex (Shift_Right (CV, 4) and 16#000F#);
85 R (RP + 5) := Hex (CV and 16#000F#);
89 -- Upper bit shift (internal code = external code)
92 R (RP + 1) := Character'Val (Shift_Right (CV, 8));
93 R (RP + 2) := Character'Val (CV and 16#FF#);
96 -- Upper bit shift (EUC)
99 JIS_To_EUC (C, C1, C2);
104 -- Upper bit shift (Shift-JIS)
106 when WCEM_Shift_JIS =>
107 JIS_To_Shift_JIS (C, C1, C2);
112 -- Upper bit shift (UTF-8)
114 -- 16#0080#-16#07ff#: 2#110xxxxx# 2#10xxxxxx#
115 -- 16#0800#-16#ffff#: 2#1110xxxx# 2#10xxxxxx# 2#10xxxxxx#
118 if CV < 16#0800# then
120 Character'Val (2#11000000# or Shift_Right (CV, 6));
122 Character'Val (2#10000000# or (CV and 2#00111111#));
127 Character'Val (2#11100000# or Shift_Right (CV, 12));
129 Character'Val (2#10000000# or
130 (Shift_Right (CV, 6) and
133 Character'Val (2#10000000# or (CV and 2#00111111#));
139 when WCEM_Brackets =>
142 R (RP) := Character'Val (CV);
147 R (RP + 3) := Hex (Shift_Right (CV, 12));
148 R (RP + 4) := Hex (Shift_Right (CV, 8) and 16#000F#);
149 R (RP + 5) := Hex (Shift_Right (CV, 4) and 16#000F#);
150 R (RP + 6) := Hex (CV and 16#000F#);
162 end Wide_String_To_String;