old-autovect-branch/gcc/ada/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) 1992-2005, 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.Wid_WChar is
  35
  36    --------------------------
  37    -- Width_Wide_Character --
  38    --------------------------
  39
  40    function Width_Wide_Character
  41      (Lo, Hi : Wide_Character) return Natural
  42    is
  43       W : Natural;
  44       P : Natural;
  45
  46    begin
  47       W := 0;
  48       for C in Lo .. Hi loop
  49          P := Wide_Character'Pos (C);
  50
  51          --  Here if we find a character in wide character range
  52          --  Width is max value (12) for Hex_hhhhhhhh
  53
  54          if P > 16#FF# then
  55             return 12;
  56
  57             --  If we are in character range then use length of character image
  58
  59          else
  60             declare
  61                S : constant String := Character'Image (Character'Val (P));
  62             begin
  63                W := Natural'Max (W, S'Length);
  64             end;
  65          end if;
  66       end loop;
  67
  68       return W;
  69    end Width_Wide_Character;
  70
  71    -------------------------------
  72    -- Width_Wide_Wide_Character --
  73    -------------------------------
  74
  75    function Width_Wide_Wide_Character
  76      (Lo, Hi : Wide_Wide_Character) return Natural
  77    is
  78       W : Natural;
  79       P : Natural;
  80
  81    begin
  82       W := 0;
  83       for C in Lo .. Hi loop
  84          P := Wide_Wide_Character'Pos (C);
  85
  86          --  Here if we find a character in wide wide character range.
  87          --  Width is max value (12) for Hex_hhhhhhhh
  88
  89          if P > 16#FF# then
  90             W := 12;
  91
  92          --  If we are in character range then use length of character image
  93
  94          else
  95             declare
  96                S : constant String := Character'Image (Character'Val (P));
  97             begin
  98                W := Natural'Max (W, S'Length);
  99             end;
 100          end if;
 101       end loop;
 102
 103       return W;
 104    end Width_Wide_Wide_Character;
 105
 106 end System.Wid_WChar;