------------------------------------------------------------------------------ -- -- -- 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 -- -- -- -- Copyright (C) 1992-2002 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. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- -- -- ------------------------------------------------------------------------------ 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 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 : access Sequential_AFCB) is pragma Warnings (Off, File); 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 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 : in FCB.File_Mode; Name : in String; Form : in 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 : in Ada.Streams.Stream_Element_Array) is begin raise Program_Error; end Write; end System.Sequential_IO;