1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT RUN-TIME COMPONENTS                         --
4--                                                                          --
5--                 S Y S T E M . S E Q U E N T I A L _ I O                  --
6--                                                                          --
7--                                 S p e c                                  --
8--                                                                          --
9--           Copyright (C) 1992-2009, Free Software Foundation, Inc.        --
10--                                                                          --
11-- GNAT is free software;  you can  redistribute it  and/or modify it under --
12-- terms of the  GNU General Public License as published  by the Free Soft- --
13-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
14-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
15-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
16-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
17--                                                                          --
18-- As a special exception under Section 7 of GPL version 3, you are granted --
19-- additional permissions described in the GCC Runtime Library Exception,   --
20-- version 3.1, as published by the Free Software Foundation.               --
21--                                                                          --
22-- You should have received a copy of the GNU General Public License and    --
23-- a copy of the GCC Runtime Library Exception along with this program;     --
24-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
25-- <http://www.gnu.org/licenses/>.                                          --
26--                                                                          --
27-- GNAT was originally developed  by the GNAT team at  New York University. --
28-- Extensive contributions were provided by Ada Core Technologies Inc.      --
29--                                                                          --
30------------------------------------------------------------------------------
31
32--  This package contains the declaration of the control block used for
33--  Sequential_IO. This must be declared at the outer library level. It also
34--  contains code that is shared between instances of Sequential_IO.
35
36with System.File_Control_Block;
37with Ada.Streams;
38
39package System.Sequential_IO is
40
41   package FCB renames System.File_Control_Block;
42
43   type Sequential_AFCB is new FCB.AFCB with null record;
44   --  No additional fields required for Sequential_IO
45
46   function AFCB_Allocate
47     (Control_Block : Sequential_AFCB) return FCB.AFCB_Ptr;
48
49   procedure AFCB_Close (File : not null access Sequential_AFCB);
50   procedure AFCB_Free  (File : not null access Sequential_AFCB);
51
52   procedure Read
53     (File : in out Sequential_AFCB;
54      Item : out Ada.Streams.Stream_Element_Array;
55      Last : out Ada.Streams.Stream_Element_Offset);
56   --  Required overriding of Read, not actually used for Sequential_IO
57
58   procedure Write
59     (File : in out Sequential_AFCB;
60      Item : Ada.Streams.Stream_Element_Array);
61   --  Required overriding of Write, not actually used for Sequential_IO
62
63   type File_Type is access all Sequential_AFCB;
64   --  File_Type in individual instantiations is derived from this type
65
66   procedure Create
67     (File : in out File_Type;
68      Mode : FCB.File_Mode := FCB.Out_File;
69      Name : String := "";
70      Form : String := "");
71
72   procedure Open
73     (File : in out File_Type;
74      Mode : FCB.File_Mode;
75      Name : String;
76      Form : String := "");
77
78end System.Sequential_IO;
79