1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT RUN-TIME COMPONENTS                         --
4--                                                                          --
5--                     S Y S T E M . W I D _ W C H A R                      --
6--                                                                          --
7--                                 B o d y                                  --
8--                                                                          --
9--          Copyright (C) 1992-2009, 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 3,  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.                                     --
17--                                                                          --
18-- As a special exception under Section 7 of GPL version 3, you are granted --
19-- additional permissions described in the GCC Runtime Library Exception,   --
20-- version 3.1, as published by the Free Software Foundation.               --
21--                                                                          --
22-- You should have received a copy of the GNU General Public License and    --
23-- a copy of the GCC Runtime Library Exception along with this program;     --
24-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
25-- <http://www.gnu.org/licenses/>.                                          --
26--                                                                          --
27-- GNAT was originally developed  by the GNAT team at  New York University. --
28-- Extensive contributions were provided by Ada Core Technologies Inc.      --
29--                                                                          --
30------------------------------------------------------------------------------
31
32package body System.Wid_WChar is
33
34   --------------------------
35   -- Width_Wide_Character --
36   --------------------------
37
38   function Width_Wide_Character
39     (Lo, Hi : Wide_Character) return Natural
40   is
41      W : Natural;
42      P : Natural;
43
44   begin
45      W := 0;
46      for C in Lo .. Hi loop
47         P := Wide_Character'Pos (C);
48
49         --  Here if we find a character in wide character range
50         --  Width is max value (12) for Hex_hhhhhhhh
51
52         if P > 16#FF# then
53            return 12;
54
55            --  If we are in character range then use length of character image
56
57         else
58            declare
59               S : constant String := Character'Image (Character'Val (P));
60            begin
61               W := Natural'Max (W, S'Length);
62            end;
63         end if;
64      end loop;
65
66      return W;
67   end Width_Wide_Character;
68
69   -------------------------------
70   -- Width_Wide_Wide_Character --
71   -------------------------------
72
73   function Width_Wide_Wide_Character
74     (Lo, Hi : Wide_Wide_Character) return Natural
75   is
76      W : Natural;
77      P : Natural;
78
79   begin
80      W := 0;
81      for C in Lo .. Hi loop
82         P := Wide_Wide_Character'Pos (C);
83
84         --  Here if we find a character in wide wide character range.
85         --  Width is max value (12) for Hex_hhhhhhhh
86
87         if P > 16#FF# then
88            W := 12;
89
90         --  If we are in character range then use length of character image
91
92         else
93            declare
94               S : constant String := Character'Image (Character'Val (P));
95            begin
96               W := Natural'Max (W, S'Length);
97            end;
98         end if;
99      end loop;
100
101      return W;
102   end Width_Wide_Wide_Character;
103
104end System.Wid_WChar;
105