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+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME COMPONENTS --
+-- --
+-- S Y S T E M . D I R E C T _ I O --
+-- --
+-- S p e c --
+-- --
+-- Copyright (C) 1992-2009, 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 3, 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. --
+-- --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception, --
+-- version 3.1, as published by the Free Software Foundation. --
+-- --
+-- You should have received a copy of the GNU General Public License and --
+-- a copy of the GCC Runtime Library Exception along with this program; --
+-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
+-- <http://www.gnu.org/licenses/>. --
+-- --
+-- 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 : not null access Direct_AFCB);
+ procedure AFCB_Free (File : not null 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 : 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 : FCB.File_Mode := FCB.Inout_File;
+ Name : String := "";
+ Form : String := "");
+
+ function End_Of_File (File : File_Type) return Boolean;
+
+ function Index (File : File_Type) return Positive_Count;
+
+ procedure Open
+ (File : in out File_Type;
+ Mode : FCB.File_Mode;
+ Name : String;
+ Form : String := "");
+
+ procedure Read
+ (File : File_Type;
+ Item : System.Address;
+ Size : Interfaces.C_Streams.size_t;
+ From : Positive_Count);
+
+ procedure Read
+ (File : File_Type;
+ Item : System.Address;
+ Size : Interfaces.C_Streams.size_t);
+
+ procedure Reset (File : in out File_Type; Mode : FCB.File_Mode);
+ procedure Reset (File : in out File_Type);
+
+ procedure Set_Index (File : File_Type; To : Positive_Count);
+
+ function Size (File : File_Type) return Count;
+
+ procedure Write
+ (File : File_Type;
+ Item : System.Address;
+ Size : Interfaces.C_Streams.size_t;
+ Zeroes : System.Storage_Elements.Storage_Array);
+ -- Note: Zeroes is the buffer of zeroes used to fill out partial records
+
+ -- The following procedures have a File_Type formal of mode IN OUT because
+ -- they may close the original file. The Close operation may raise an
+ -- exception, but in that case we want any assignment to the formal to
+ -- be effective anyway, so it must be passed by reference (or the caller
+ -- will be left with a dangling pointer).
+
+ pragma Export_Procedure
+ (Internal => Reset,
+ External => "",
+ Parameter_Types => (File_Type),
+ Mechanism => Reference);
+ pragma Export_Procedure
+ (Internal => Reset,
+ External => "",
+ Parameter_Types => (File_Type, FCB.File_Mode),
+ Mechanism => (File => Reference));
+
+end System.Direct_IO;