161 lines
5.3 KiB
Ada
161 lines
5.3 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUNTIME COMPONENTS --
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-- --
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-- S Y S T E M . S E Q U E N T I A L _ I O --
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-- --
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-- B o d y --
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-- --
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-- $Revision: 1.7 $ --
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-- --
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-- Copyright (C) 1992-1998 Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 2, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING. If not, write --
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-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
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-- MA 02111-1307, USA. --
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-- --
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-- As a special exception, if other files instantiate generics from this --
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-- unit, or you link this unit with other files to produce an executable, --
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-- this unit does not by itself cause the resulting executable to be --
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-- covered by the GNU General Public License. This exception does not --
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-- however invalidate any other reasons why the executable file might be --
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-- covered by the GNU Public License. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
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-- --
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------------------------------------------------------------------------------
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with System.File_IO;
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with Unchecked_Deallocation;
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package body System.Sequential_IO is
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subtype AP is FCB.AFCB_Ptr;
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package FIO renames System.File_IO;
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-------------------
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-- AFCB_Allocate --
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-------------------
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function AFCB_Allocate
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(Control_Block : Sequential_AFCB)
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return FCB.AFCB_Ptr
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is
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begin
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return new Sequential_AFCB;
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end AFCB_Allocate;
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----------------
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-- AFCB_Close --
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----------------
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-- No special processing required for Sequential_IO close
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procedure AFCB_Close (File : access Sequential_AFCB) is
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begin
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null;
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end AFCB_Close;
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---------------
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-- AFCB_Free --
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---------------
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procedure AFCB_Free (File : access Sequential_AFCB) is
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type FCB_Ptr is access all Sequential_AFCB;
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FT : FCB_Ptr := FCB_Ptr (File);
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procedure Free is new
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Unchecked_Deallocation (Sequential_AFCB, FCB_Ptr);
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begin
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Free (FT);
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end AFCB_Free;
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------------
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-- Create --
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------------
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procedure Create
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(File : in out File_Type;
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Mode : in FCB.File_Mode := FCB.Out_File;
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Name : in String := "";
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Form : in String := "")
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is
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File_Control_Block : Sequential_AFCB;
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begin
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FIO.Open (File_Ptr => AP (File),
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Dummy_FCB => File_Control_Block,
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Mode => Mode,
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Name => Name,
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Form => Form,
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Amethod => 'Q',
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Creat => True,
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Text => False);
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end Create;
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----------
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-- Open --
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----------
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procedure Open
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(File : in out File_Type;
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Mode : in FCB.File_Mode;
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Name : in String;
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Form : in String := "")
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is
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File_Control_Block : Sequential_AFCB;
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begin
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FIO.Open (File_Ptr => AP (File),
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Dummy_FCB => File_Control_Block,
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Mode => Mode,
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Name => Name,
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Form => Form,
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Amethod => 'Q',
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Creat => False,
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Text => False);
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end Open;
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----------
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-- Read --
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----------
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-- Not used, since Sequential_IO files are not used as streams
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procedure Read
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(File : in out Sequential_AFCB;
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Item : out Ada.Streams.Stream_Element_Array;
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Last : out Ada.Streams.Stream_Element_Offset)
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is
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begin
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raise Program_Error;
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end Read;
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-----------
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-- Write --
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-----------
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-- Not used, since Sequential_IO files are not used as streams
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procedure Write
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(File : in out Sequential_AFCB;
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Item : in Ada.Streams.Stream_Element_Array)
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is
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begin
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raise Program_Error;
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end Write;
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end System.Sequential_IO;
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