143 lines
5.9 KiB
Ada
143 lines
5.9 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- S Y S T E M . D I R E C T _ I O --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 1992-2014, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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-- This package contains the declaration of the control block used for
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-- Direct_IO. This must be declared at the outer library level. It also
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-- contains code that is shared between instances of Direct_IO.
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with Interfaces.C_Streams;
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with Ada.Streams;
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with System.File_Control_Block;
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with System.Storage_Elements;
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package System.Direct_IO is
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package FCB renames System.File_Control_Block;
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type Operation is (Op_Read, Op_Write, Op_Other);
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-- Type used to record last operation (to optimize sequential operations)
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subtype Count is Interfaces.C_Streams.int64;
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-- The Count type in each instantiation is derived from this type
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subtype Positive_Count is Count range 1 .. Count'Last;
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type Direct_AFCB is new FCB.AFCB with record
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Index : Count := 1;
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-- Current Index value
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Bytes : Interfaces.C_Streams.size_t;
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-- Length of item in bytes (set from inside generic template)
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Last_Op : Operation := Op_Other;
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-- Last operation performed on file, used to avoid unnecessary
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-- repositioning between successive read or write operations.
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end record;
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function AFCB_Allocate (Control_Block : Direct_AFCB) return FCB.AFCB_Ptr;
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procedure AFCB_Close (File : not null access Direct_AFCB);
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procedure AFCB_Free (File : not null access Direct_AFCB);
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procedure Read
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(File : in out Direct_AFCB;
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Item : out Ada.Streams.Stream_Element_Array;
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Last : out Ada.Streams.Stream_Element_Offset);
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-- Required overriding of Read, not actually used for Direct_IO
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procedure Write
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(File : in out Direct_AFCB;
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Item : Ada.Streams.Stream_Element_Array);
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-- Required overriding of Write, not actually used for Direct_IO
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type File_Type is access all Direct_AFCB;
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-- File_Type in individual instantiations is derived from this type
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procedure Create
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(File : in out File_Type;
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Mode : FCB.File_Mode := FCB.Inout_File;
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Name : String := "";
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Form : String := "");
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function End_Of_File (File : File_Type) return Boolean;
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function Index (File : File_Type) return Positive_Count;
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procedure Open
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(File : in out File_Type;
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Mode : FCB.File_Mode;
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Name : String;
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Form : String := "");
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procedure Read
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(File : File_Type;
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Item : System.Address;
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Size : Interfaces.C_Streams.size_t;
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From : Positive_Count);
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procedure Read
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(File : File_Type;
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Item : System.Address;
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Size : Interfaces.C_Streams.size_t);
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procedure Reset (File : in out File_Type; Mode : FCB.File_Mode);
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procedure Reset (File : in out File_Type);
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procedure Set_Index (File : File_Type; To : Positive_Count);
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function Size (File : File_Type) return Count;
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procedure Write
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(File : File_Type;
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Item : System.Address;
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Size : Interfaces.C_Streams.size_t;
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Zeroes : System.Storage_Elements.Storage_Array);
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-- Note: Zeroes is the buffer of zeroes used to fill out partial records
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-- The following procedures have a File_Type formal of mode IN OUT because
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-- they may close the original file. The Close operation may raise an
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-- exception, but in that case we want any assignment to the formal to
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-- be effective anyway, so it must be passed by reference (or the caller
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-- will be left with a dangling pointer).
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pragma Export_Procedure
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(Internal => Reset,
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External => "",
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Parameter_Types => (File_Type),
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Mechanism => Reference);
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pragma Export_Procedure
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(Internal => Reset,
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External => "",
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Parameter_Types => (File_Type, FCB.File_Mode),
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Mechanism => (File => Reference));
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end System.Direct_IO;
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