gcc/ada/s-wchwts.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --                       S Y S T E M . W C H _ W T S                        --
   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 with System.WCh_Con; use System.WCh_Con;
  35 with System.WCh_Cnv; use System.WCh_Cnv;
  36
  37 package body System.WCh_WtS is
  38
  39    -----------------------
  40    -- Local Subprograms --
  41    -----------------------
  42
  43    procedure Store_UTF_32_Character
  44      (U  : UTF_32_Code;
  45       S  : out String;
  46       P  : in out Integer;
  47       EM : WC_Encoding_Method);
  48    --  Stores the string representation of the wide or wide wide character
  49    --  whose code is given as U, starting at S (P + 1). P is incremented to
  50    --  point to the last character stored. Raises CE if character cannot be
  51    --  stored using the given encoding method.
  52
  53    ----------------------------
  54    -- Store_UTF_32_Character --
  55    ----------------------------
  56
  57    procedure Store_UTF_32_Character
  58      (U  : UTF_32_Code;
  59       S  : out String;
  60       P  : in out Integer;
  61       EM : WC_Encoding_Method)
  62    is
  63       procedure Out_Char (C : Character);
  64       pragma Inline (Out_Char);
  65       --  Procedure to increment P and store C at S (P)
  66
  67       procedure Store_Chars is new UTF_32_To_Char_Sequence (Out_Char);
  68
  69       --------------
  70       -- Out_Char --
  71       --------------
  72
  73       procedure Out_Char (C : Character) is
  74       begin
  75          P := P + 1;
  76          S (P) := C;
  77       end Out_Char;
  78
  79    begin
  80       Store_Chars (U, EM);
  81    end Store_UTF_32_Character;
  82
  83    ---------------------------
  84    -- Wide_String_To_String --
  85    ---------------------------
  86
  87    function Wide_String_To_String
  88      (S  : Wide_String;
  89       EM : WC_Encoding_Method) return String
  90    is
  91       R  : String (1 .. 5 * S'Length); -- worst case length!
  92       RP : Natural;
  93
  94    begin
  95       RP := 0;
  96       for SP in S'Range loop
  97          Store_UTF_32_Character (Wide_Character'Pos (S (SP)), R, RP, EM);
  98       end loop;
  99
 100       return R (1 .. RP);
 101    end Wide_String_To_String;
 102
 103    --------------------------------
 104    -- Wide_Wide_Sring_To_String --
 105    --------------------------------
 106
 107    function Wide_Wide_String_To_String
 108      (S  : Wide_Wide_String;
 109       EM : WC_Encoding_Method) return String
 110    is
 111       R  : String (1 .. 7 * S'Length); -- worst case length!
 112       RP : Natural;
 113
 114    begin
 115       RP := 0;
 116
 117       for SP in S'Range loop
 118          Store_UTF_32_Character (Wide_Wide_Character'Pos (S (SP)), R, RP, EM);
 119       end loop;
 120
 121       return R (1 .. RP);
 122    end Wide_Wide_String_To_String;
 123
 124 end System.WCh_WtS;