gcc/ada/a-siocst.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                        GNAT RUN-TIME COMPONENTS                          --
   4 --                                                                          --
   5 --          A D A . S E Q U E N T I A L _ I O . C _ S T R E A M S           --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --                                                                          --
  10 --          Copyright (C) 1992-1998 Free Software Foundation, Inc.          --
  11 --                                                                          --
  12 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  13 -- terms of the  GNU General Public License as published  by the Free Soft- --
  14 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  15 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  16 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  17 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  18 -- for  more details.  You should have  received  a copy of the GNU General --
  19 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  20 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  21 -- MA 02111-1307, USA.                                                      --
  22 --                                                                          --
  23 -- As a special exception,  if other files  instantiate  generics from this --
  24 -- unit, or you link  this unit with other files  to produce an executable, --
  25 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  26 -- covered  by the  GNU  General  Public  License.  This exception does not --
  27 -- however invalidate  any other reasons why  the executable file  might be --
  28 -- covered by the  GNU Public License.                                      --
  29 --                                                                          --
  30 -- GNAT was originally developed  by the GNAT team at  New York University. --
  31 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  32 --                                                                          --
  33 ------------------------------------------------------------------------------
  34
  35 with Interfaces.C_Streams; use Interfaces.C_Streams;
  36 with System.File_IO;
  37 with System.File_Control_Block;
  38 with System.Sequential_IO;
  39 with Unchecked_Conversion;
  40
  41 package body Ada.Sequential_IO.C_Streams is
  42
  43    package FIO renames System.File_IO;
  44    package FCB renames System.File_Control_Block;
  45    package SIO renames System.Sequential_IO;
  46
  47    subtype AP is FCB.AFCB_Ptr;
  48
  49    function To_FCB is new Unchecked_Conversion (File_Mode, FCB.File_Mode);
  50
  51    --------------
  52    -- C_Stream --
  53    --------------
  54
  55    function C_Stream (F : File_Type) return FILEs is
  56    begin
  57       FIO.Check_File_Open (AP (F));
  58       return F.Stream;
  59    end C_Stream;
  60
  61    ----------
  62    -- Open --
  63    ----------
  64
  65    procedure Open
  66      (File     : in out File_Type;
  67       Mode     : in File_Mode;
  68       C_Stream : in FILEs;
  69       Form     : in String := "")
  70    is
  71       File_Control_Block : SIO.Sequential_AFCB;
  72
  73    begin
  74       FIO.Open (File_Ptr  => AP (File),
  75                 Dummy_FCB => File_Control_Block,
  76                 Mode      => To_FCB (Mode),
  77                 Name      => "",
  78                 Form      => Form,
  79                 Amethod   => 'Q',
  80                 Creat     => False,
  81                 Text      => False,
  82                 C_Stream  => C_Stream);
  83    end Open;
  84
  85 end Ada.Sequential_IO.C_Streams;