1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT RUN-TIME COMPONENTS                         --
4--                                                                          --
5--                     S Y S T E M . I M G _ W C H A R                      --
6--                                                                          --
7--                                 B o d y                                  --
8--                                                                          --
9--          Copyright (C) 1992-2003, Free Software Foundation, Inc.         --
10--                                                                          --
11-- GNAT is free software;  you can  redistribute it  and/or modify it under --
12-- terms of the  GNU General Public License as published  by the Free Soft- --
13-- ware  Foundation;  either version 2,  or (at your option) any later ver- --
14-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
15-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
16-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
17-- for  more details.  You should have  received  a copy of the GNU General --
18-- Public License  distributed with GNAT;  see file COPYING.  If not, write --
19-- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
20-- MA 02111-1307, USA.                                                      --
21--                                                                          --
22-- As a special exception,  if other files  instantiate  generics from this --
23-- unit, or you link  this unit with other files  to produce an executable, --
24-- this  unit  does not  by itself cause  the resulting  executable  to  be --
25-- covered  by the  GNU  General  Public  License.  This exception does not --
26-- however invalidate  any other reasons why  the executable file  might be --
27-- covered by the  GNU Public License.                                      --
28--                                                                          --
29-- GNAT was originally developed  by the GNAT team at  New York University. --
30-- Extensive contributions were provided by Ada Core Technologies Inc.      --
31--                                                                          --
32------------------------------------------------------------------------------
33
34with System.Img_Char; use System.Img_Char;
35with System.WCh_Con;  use System.WCh_Con;
36with System.WCh_WtS;  use System.WCh_WtS;
37
38package body System.Img_WChar is
39
40   --------------------------
41   -- Image_Wide_Character --
42   --------------------------
43
44   function Image_Wide_Character
45     (V    : Wide_Character;
46      EM   : WC_Encoding_Method)
47      return String
48   is
49      Val : constant Natural := Wide_Character'Pos (V);
50      WS  : Wide_String (1 .. 3);
51
52   begin
53      --  If in range of standard character, use standard character routine
54
55      if Val < 16#80#
56        or else (Val <= 16#FF#
57                  and then EM not in WC_Upper_Half_Encoding_Method)
58      then
59         return Image_Character (Character'Val (Val));
60
61      --  if the value is one of the last two characters in the type, use
62      --  their language-defined names (3.5.2(3)).
63
64      elsif Val = 16#FFFE# then
65         return "FFFE";
66
67      elsif Val = 16#FFFF# then
68         return "FFFF";
69
70      --  Otherwise return an appropriate escape sequence (i.e. one matching
71      --  the convention implemented by Scn.Wide_Char). The easiest thing is
72      --  to build a wide string for the result, and then use the Wide_Value
73      --  function to build the resulting String.
74
75      else
76         WS (1) := ''';
77         WS (2) := V;
78         WS (3) := ''';
79
80         return Wide_String_To_String (WS, EM);
81      end if;
82
83   end Image_Wide_Character;
84
85end System.Img_WChar;
86