1 ------------------------------------------------------------------------------
3 -- GNAT RUNTIME COMPONENTS --
5 -- S Y S T E M . W I D _ W C H A R --
9 -- Copyright (C) 1992-1998 Free Software Foundation, Inc. --
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. --
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. --
29 -- GNAT was originally developed by the GNAT team at New York University. --
30 -- Extensive contributions were provided by Ada Core Technologies Inc. --
32 ------------------------------------------------------------------------------
34 with System.WCh_Con; use System.WCh_Con;
36 package body System.Wid_WChar is
38 --------------------------
39 -- Width_Wide_Character --
40 --------------------------
42 function Width_Wide_Character
43 (Lo, Hi : Wide_Character;
44 EM : WC_Encoding_Method)
53 for C in Lo .. Hi loop
54 P := Wide_Character'Pos (C);
56 -- Here if we find a character in wide character range
63 return Natural'Max (W, 5);
66 return Natural'Max (W, 2);
68 when WCEM_Shift_JIS =>
69 return Natural'Max (W, 2);
72 return Natural'Max (W, 2);
75 if Hi > Wide_Character'Val (16#07FF#) then
76 return Natural'Max (W, 3);
78 return Natural'Max (W, 2);
82 return Natural'Max (W, 8);
86 -- If we are in character range then use length of character image
90 S : constant String := Character'Image (Character'Val (P));
92 W := Natural'Max (W, S'Length);
98 end Width_Wide_Character;
100 end System.Wid_WChar;