| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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; |
