gcc/ada/s-imgwch.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --                     S Y S T E M . I M G _ W C H A R                      --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2003, Free Software Foundation, Inc.         --
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  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
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  20 -- MA 02111-1307, USA.                                                      --
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  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 --
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  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 with System.Img_Char; use System.Img_Char;
  35 with System.WCh_Con;  use System.WCh_Con;
  36 with System.WCh_WtS;  use System.WCh_WtS;
  37
  38 package body System.Img_WChar is
  39
  40    --------------------------
  41    -- Image_Wide_Character --
  42    --------------------------
  43
  44    function Image_Wide_Character
  45      (V    : Wide_Character;
  46       EM   : WC_Encoding_Method)
  47       return String
  48    is
  49       Val : constant Natural := Wide_Character'Pos (V);
  50       WS  : Wide_String (1 .. 3);
  51
  52    begin
  53       --  If in range of standard character, use standard character routine
  54
  55       if Val < 16#80#
  56         or else (Val <= 16#FF#
  57                   and then EM not in WC_Upper_Half_Encoding_Method)
  58       then
  59          return Image_Character (Character'Val (Val));
  60
  61       --  if the value is one of the last two characters in the type, use
  62       --  their language-defined names (3.5.2(3)).
  63
  64       elsif Val = 16#FFFE# then
  65          return "FFFE";
  66
  67       elsif Val = 16#FFFF# then
  68          return "FFFF";
  69
  70       --  Otherwise return an appropriate escape sequence (i.e. one matching
  71       --  the convention implemented by Scn.Wide_Char). The easiest thing is
  72       --  to build a wide string for the result, and then use the Wide_Value
  73       --  function to build the resulting String.
  74
  75       else
  76          WS (1) := ''';
  77          WS (2) := V;
  78          WS (3) := ''';
  79
  80          return Wide_String_To_String (WS, EM);
  81       end if;
  82
  83    end Image_Wide_Character;
  84
  85 end System.Img_WChar;