gcc/ada/a-diocst.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                        GNAT RUN-TIME COMPONENTS                          --
   4 --                                                                          --
   5 --              A D A . D I R E C T _ I O . C _ S T R E A M S               --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2002 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 with Interfaces.C_Streams; use Interfaces.C_Streams;
  35 with System.File_IO;
  36 with System.File_Control_Block;
  37 with System.Direct_IO;
  38 with Unchecked_Conversion;
  39
  40 package body Ada.Direct_IO.C_Streams is
  41
  42    package FIO renames System.File_IO;
  43    package FCB renames System.File_Control_Block;
  44    package DIO renames System.Direct_IO;
  45
  46    subtype AP is FCB.AFCB_Ptr;
  47
  48    function To_FCB is new Unchecked_Conversion (File_Mode, FCB.File_Mode);
  49
  50    --------------
  51    -- C_Stream --
  52    --------------
  53
  54    function C_Stream (F : File_Type) return FILEs is
  55    begin
  56       FIO.Check_File_Open (AP (F));
  57       return F.Stream;
  58    end C_Stream;
  59
  60    ----------
  61    -- Open --
  62    ----------
  63
  64    procedure Open
  65      (File     : in out File_Type;
  66       Mode     : File_Mode;
  67       C_Stream : FILEs;
  68       Form     : String := "";
  69       Name     : String := "")
  70    is
  71       Dummy_File_Control_Block : DIO.Direct_AFCB;
  72       pragma Warnings (Off, Dummy_File_Control_Block);
  73       --  Yes, we know this is never assigned a value, only the tag
  74       --  is used for dispatching purposes, so that's expected.
  75
  76    begin
  77       FIO.Open (File_Ptr  => AP (File),
  78                 Dummy_FCB => Dummy_File_Control_Block,
  79                 Mode      => To_FCB (Mode),
  80                 Name      => Name,
  81                 Form      => Form,
  82                 Amethod   => 'D',
  83                 Creat     => False,
  84                 Text      => False,
  85                 C_Stream  => C_Stream);
  86
  87       File.Bytes := Bytes;
  88    end Open;
  89
  90 end Ada.Direct_IO.C_Streams;