gcc/ada/s-wwdcha.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --                      S Y S T E M . W W D _ C H A R                       --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2005, 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,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, 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
  34 package body System.WWd_Char is
  35
  36    --------------------------
  37    -- Wide_Width_Character --
  38    --------------------------
  39
  40    function Wide_Width_Character (Lo, Hi : Character) return Natural is
  41       W : Natural;
  42
  43    begin
  44       W := 0;
  45       for C in Lo .. Hi loop
  46          --  For Character range, use length of image
  47
  48          if Character'Pos (C) < 256 then
  49             declare
  50                S : constant Wide_String := Character'Wide_Image (C);
  51             begin
  52                W := Natural'Max (W, S'Length);
  53             end;
  54
  55             --  For wide character, always max out at 12 (Hex_hhhhhhhh)
  56
  57          else
  58             return 12;
  59          end if;
  60       end loop;
  61
  62       return W;
  63    end Wide_Width_Character;
  64
  65    -------------------------------
  66    -- Wide_Wide_Width_Character --
  67    -------------------------------
  68
  69    function Wide_Wide_Width_Character (Lo, Hi : Character) return Natural is
  70       W : Natural;
  71
  72    begin
  73       W := 0;
  74       for C in Lo .. Hi loop
  75
  76          --  For Character range, use length of image
  77
  78          if Character'Pos (C) < 256 then
  79             declare
  80                S : constant String := Character'Image (C);
  81             begin
  82                W := Natural'Max (W, S'Length);
  83             end;
  84
  85             --  For wide character, always max out at 12 (Hex_hhhhhhhh)
  86
  87          else
  88             return 12;
  89          end if;
  90       end loop;
  91
  92       return W;
  93    end Wide_Wide_Width_Character;
  94
  95 end System.WWd_Char;