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------------------------------------------------------------------------------

--                                                                          --

--                         GNAT RUN-TIME COMPONENTS                         --

--                                                                          --

--                 S Y S T E M . S E Q U E N T I A L _ I O                  --

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--          Copyright (C) 1992-2009, Free Software Foundation, Inc.         --

--                                                                          --

-- GNAT is free software;  you can  redistribute it  and/or modify it under --

-- terms of the  GNU General Public License as published  by the Free Soft- --

-- ware  Foundation;  either version 3,  or (at your option) any later ver- --

-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --

-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --

-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --

--                                                                          --

-- As a special exception under Section 7 of GPL version 3, you are granted --

-- additional permissions described in the GCC Runtime Library Exception,   --

-- version 3.1, as published by the Free Software Foundation.               --

--                                                                          --

-- You should have received a copy of the GNU General Public License and    --

-- a copy of the GCC Runtime Library Exception along with this program;     --

-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --

-- <http://www.gnu.org/licenses/>.                                          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

------------------------------------------------------------------------------

with System.File_IO;

with Ada.Unchecked_Deallocation;

package body System.Sequential_IO is

   subtype AP is FCB.AFCB_Ptr;

   package FIO renames System.File_IO;

   -------------------

   -- AFCB_Allocate --

   -------------------

   function AFCB_Allocate

     (Control_Block : Sequential_AFCB) return FCB.AFCB_Ptr

   is

      pragma Warnings (Off, Control_Block);

   begin

      return new Sequential_AFCB;

   end AFCB_Allocate;

   ----------------

   -- AFCB_Close --

   ----------------

   --  No special processing required for Sequential_IO close

   procedure AFCB_Close (File : not null access Sequential_AFCB) is

      pragma Warnings (Off, File);

   begin

      null;

   end AFCB_Close;

   ---------------

   -- AFCB_Free --

   ---------------

   procedure AFCB_Free (File : not null access Sequential_AFCB) is

      type FCB_Ptr is access all Sequential_AFCB;

      FT : FCB_Ptr := FCB_Ptr (File);

      procedure Free is new

        Ada.Unchecked_Deallocation (Sequential_AFCB, FCB_Ptr);

   begin

      Free (FT);

   end AFCB_Free;

   ------------

   -- Create --

   ------------

   procedure Create

     (File : in out File_Type;

      Mode : FCB.File_Mode := FCB.Out_File;

      Name : String := "";

      Form : String := "")

   is

      Dummy_File_Control_Block : Sequential_AFCB;

      pragma Warnings (Off, Dummy_File_Control_Block);

      --  Yes, we know this is never assigned a value, only the tag

      --  is used for dispatching purposes, so that's expected.

   begin

      FIO.Open (File_Ptr  => AP (File),

                Dummy_FCB => Dummy_File_Control_Block,

                Mode      => Mode,

                Name      => Name,

                Form      => Form,

                Amethod   => 'Q',

                Creat     => True,

                Text      => False);

   end Create;

   ----------

   -- Open --

   ----------

   procedure Open

     (File : in out File_Type;

      Mode : FCB.File_Mode;

      Name : String;

      Form : String := "")

   is

      Dummy_File_Control_Block : Sequential_AFCB;

      pragma Warnings (Off, Dummy_File_Control_Block);

      --  Yes, we know this is never assigned a value, only the tag

      --  is used for dispatching purposes, so that's expected.

   begin

      FIO.Open (File_Ptr  => AP (File),

                Dummy_FCB => Dummy_File_Control_Block,

                Mode      => Mode,

                Name      => Name,

                Form      => Form,

                Amethod   => 'Q',

                Creat     => False,

                Text      => False);

   end Open;

   ----------

   -- Read --

   ----------

   --  Not used, since Sequential_IO files are not used as streams

   procedure Read

     (File : in out Sequential_AFCB;

      Item : out Ada.Streams.Stream_Element_Array;

      Last : out Ada.Streams.Stream_Element_Offset)

   is

   begin

      raise Program_Error;

   end Read;

   -----------

   -- Write --

   -----------

   --  Not used, since Sequential_IO files are not used as streams

   procedure Write

     (File : in out Sequential_AFCB;

      Item : Ada.Streams.Stream_Element_Array)

   is

   begin

      raise Program_Error;

   end Write;

end System.Sequential_IO;