gcc/ada/a-swunau.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                          GNAT RUNTIME COMPONENTS                         --
   4 --                                                                          --
   5 --        A D A . S T R I N G S . W I D E _ U N B O U N D E D . A U X       --
   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,  59 Temple Place - Suite 330,  Boston, --
  20 -- MA 02111-1307, 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 Ada.Strings.Wide_Unbounded.Aux is
  35
  36    --------------------
  37    -- Get_Wide_String --
  38    ---------------------
  39
  40    function Get_Wide_String
  41      (U : Unbounded_Wide_String) return Wide_String_Access
  42    is
  43    begin
  44       if U.Last = U.Reference'Length then
  45          return U.Reference;
  46
  47       else
  48          declare
  49             type Unbounded_Wide_String_Access is
  50               access all Unbounded_Wide_String;
  51
  52             U_Ptr : constant Unbounded_Wide_String_Access :=
  53                       U'Unrestricted_Access;
  54             --  Unbounded_Wide_String is a controlled type which is always
  55             --  passed by copy it is always safe to take the pointer to such
  56             --  object here. This pointer is used to set the U.Reference value
  57             --  which would not be possible otherwise as U is read-only.
  58
  59             Old : Wide_String_Access := U.Reference;
  60
  61          begin
  62             U_Ptr.Reference := new Wide_String'(U.Reference (1 .. U.Last));
  63             Free (Old);
  64             return U.Reference;
  65          end;
  66       end if;
  67    end Get_Wide_String;
  68
  69    ---------------------
  70    -- Set_Wide_String --
  71    ---------------------
  72
  73    procedure Set_Wide_String
  74      (UP : in out Unbounded_Wide_String;
  75       S  : Wide_String)
  76    is
  77    begin
  78       if UP.Last = S'Length then
  79          UP.Reference.all := S;
  80
  81       else
  82          declare
  83             subtype String_1 is Wide_String (1 .. S'Length);
  84             Tmp : Wide_String_Access;
  85          begin
  86             Tmp := new Wide_String'(String_1 (S));
  87             Finalize (UP);
  88             UP.Reference := Tmp;
  89             UP.Last := UP.Reference'Length;
  90          end;
  91       end if;
  92    end Set_Wide_String;
  93
  94    procedure Set_Wide_String
  95      (UP : in out Unbounded_Wide_String;
  96       S  : Wide_String_Access)
  97    is
  98    begin
  99       Finalize (UP);
 100       UP.Reference := S;
 101       UP.Last := UP.Reference'Length;
 102    end Set_Wide_String;
 103
 104 end Ada.Strings.Wide_Unbounded.Aux;