File : s-widwch.adb
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 -- --
19 -- --
20 -- --
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
32 package 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
104 end System.Wid_WChar;