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-------------------------------------------------------------------------------
--- --
--- GNAT RUNTIME COMPONENTS --
--- --
--- S Y S T E M . D I R E C T _ I O --
--- --
--- S p e c --
--- --
--- $Revision: 1.1.16.2 $
--- --
--- Copyright (C) 1992,1993,1994,1995,1996 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. --
--- --
-------------------------------------------------------------------------------
-
--- This package contains the declaration of the control block used for
--- Direct_IO. This must be declared at the outer library level. It also
--- contains code that is shared between instances of Direct_IO.
-
-with Interfaces.C_Streams;
-with Ada.Streams;
-with System.File_Control_Block;
-with System.Storage_Elements;
-
-package System.Direct_IO is
-
- package FCB renames System.File_Control_Block;
-
- type Operation is (Op_Read, Op_Write, Op_Other);
- -- Type used to record last operation (to optimize sequential operations)
-
- subtype Count is Interfaces.C_Streams.long;
- -- The Count type in each instantiation is derived from this type
-
- subtype Positive_Count is Count range 1 .. Count'Last;
-
- type Direct_AFCB is new FCB.AFCB with record
- Index : Count := 1;
- -- Current Index value
-
- Bytes : Interfaces.C_Streams.size_t;
- -- Length of item in bytes (set from inside generic template)
-
- Last_Op : Operation := Op_Other;
- -- Last operation performed on file, used to avoid unnecessary
- -- repositioning between successive read or write operations.
- end record;
-
- function AFCB_Allocate (Control_Block : Direct_AFCB) return FCB.AFCB_Ptr;
-
- procedure AFCB_Close (File : access Direct_AFCB);
- procedure AFCB_Free (File : access Direct_AFCB);
-
- procedure Read
- (File : in out Direct_AFCB;
- Item : out Ada.Streams.Stream_Element_Array;
- Last : out Ada.Streams.Stream_Element_Offset);
- -- Required overriding of Read, not actually used for Direct_IO
-
- procedure Write
- (File : in out Direct_AFCB;
- Item : in Ada.Streams.Stream_Element_Array);
- -- Required overriding of Write, not actually used for Direct_IO
-
- type File_Type is access all Direct_AFCB;
- -- File_Type in individual instantiations is derived from this type
-
- procedure Create
- (File : in out File_Type;
- Mode : in FCB.File_Mode := FCB.Inout_File;
- Name : in String := "";
- Form : in String := "");
-
- function End_Of_File (File : in File_Type) return Boolean;
-
- function Index (File : in File_Type) return Positive_Count;
-
- procedure Open
- (File : in out File_Type;
- Mode : in FCB.File_Mode;
- Name : in String;
- Form : in String := "");
-
- procedure Read
- (File : in File_Type;
- Item : System.Address;
- Size : in Interfaces.C_Streams.size_t;
- From : in Positive_Count);
-
- procedure Read
- (File : in File_Type;
- Item : System.Address;
- Size : in Interfaces.C_Streams.size_t);
-
- procedure Reset (File : in out File_Type; Mode : in FCB.File_Mode);
-
- procedure Reset (File : in out File_Type);
-
- procedure Set_Index (File : in File_Type; To : in Positive_Count);
-
- function Size (File : in File_Type) return Count;
-
- procedure Write
- (File : in File_Type;
- Item : System.Address;
- Size : in Interfaces.C_Streams.size_t;
- Zeroes : System.Storage_Elements.Storage_Array);
- -- Note: Zeroes is the buffer of zeroes used to fill out partial records
-
-end System.Direct_IO;
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