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------------------------------------------------------------------------------
-- --
-- GNAT RUNTIME COMPONENTS --
-- --
-- S Y S T E M . S E Q U E N T I A L _ I O --
-- --
-- B o d y --
-- --
-- $Revision: 1.6 $ --
-- --
-- Copyright (C) 1992-1997 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 2, 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. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING. If not, write --
-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
-- --
------------------------------------------------------------------------------
with Ada.IO_Exceptions; use Ada.IO_Exceptions;
with System; use System;
with System.File_IO;
with 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
begin
return new Sequential_AFCB;
end AFCB_Allocate;
----------------
-- AFCB_Close --
----------------
-- No special processing required for Sequential_IO close
procedure AFCB_Close (File : access Sequential_AFCB) is
begin
null;
end AFCB_Close;
---------------
-- AFCB_Free --
---------------
procedure AFCB_Free (File : access Sequential_AFCB) is
type FCB_Ptr is access all Sequential_AFCB;
FT : FCB_Ptr := FCB_Ptr (File);
procedure Free is new
Unchecked_Deallocation (Sequential_AFCB, FCB_Ptr);
begin
Free (FT);
end AFCB_Free;
------------
-- Create --
------------
procedure Create
(File : in out File_Type;
Mode : in FCB.File_Mode := FCB.Out_File;
Name : in String := "";
Form : in String := "")
is
File_Control_Block : Sequential_AFCB;
begin
FIO.Open (File_Ptr => AP (File),
Dummy_FCB => 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 : in FCB.File_Mode;
Name : in String;
Form : in String := "")
is
File_Control_Block : Sequential_AFCB;
begin
FIO.Open (File_Ptr => AP (File),
Dummy_FCB => 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 : in Ada.Streams.Stream_Element_Array)
is
begin
raise Program_Error;
end Write;
end System.Sequential_IO;
|
