1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT RUNTIME 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) 1992,1993,1994 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 2,  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.  See the GNU General Public License --
17-- for  more details.  You should have  received  a copy of the GNU General --
18-- Public License  distributed with GNAT;  see file COPYING.  If not, write --
19-- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
20-- MA 02111-1307, USA.                                                      --
21--                                                                          --
22-- As a special exception,  if other files  instantiate  generics from this --
23-- unit, or you link  this unit with other files  to produce an executable, --
24-- this  unit  does not  by itself cause  the resulting  executable  to  be --
25-- covered  by the  GNU  General  Public  License.  This exception does not --
26-- however invalidate  any other reasons why  the executable file  might be --
27-- covered by the  GNU Public License.                                      --
28--                                                                          --
29-- GNAT was originally developed  by the GNAT team at  New York University. --
30-- Extensive contributions were provided by Ada Core Technologies Inc.      --
31--                                                                          --
32------------------------------------------------------------------------------
33
34--  This package contains the declaration of the control block used for
35--  Seqential_IO. This must be declared at the outer library level. It also
36--  contains code that is shared between instances of Sequential_IO.
37
38with System.File_Control_Block;
39with Ada.Streams;
40
41package System.Sequential_IO is
42
43   package FCB renames System.File_Control_Block;
44
45   type Sequential_AFCB is new FCB.AFCB with null record;
46   --  No additional fields required for Sequential_IO
47
48   function AFCB_Allocate
49     (Control_Block : Sequential_AFCB)
50      return          FCB.AFCB_Ptr;
51
52   procedure AFCB_Close (File : access Sequential_AFCB);
53   procedure AFCB_Free  (File : access Sequential_AFCB);
54
55   procedure Read
56     (File : in out Sequential_AFCB;
57      Item : out Ada.Streams.Stream_Element_Array;
58      Last : out Ada.Streams.Stream_Element_Offset);
59   --  Required overriding of Read, not actually used for Sequential_IO
60
61   procedure Write
62     (File : in out Sequential_AFCB;
63      Item : in Ada.Streams.Stream_Element_Array);
64   --  Required overriding of Write, not actually used for Sequential_IO
65
66   type File_Type is access all Sequential_AFCB;
67   --  File_Type in individual instantiations is derived from this type
68
69   procedure Create
70     (File : in out File_Type;
71      Mode : in FCB.File_Mode := FCB.Out_File;
72      Name : in String := "";
73      Form : in String := "");
74
75   procedure Open
76     (File : in out File_Type;
77      Mode : in FCB.File_Mode;
78      Name : in String;
79      Form : in String := "");
80
81end System.Sequential_IO;
82