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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- A D A . D I R E C T _ I O --
-- --
-- S p e c --
-- --
-- Copyright (C) 1992-2009, Free Software Foundation, Inc. --
-- --
-- This specification is derived from the Ada Reference Manual for use with --
-- GNAT. The copyright notice above, and the license provisions that follow --
-- apply solely to the contents of the part following the private keyword. --
-- --
-- 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. --
-- --
------------------------------------------------------------------------------
with Ada.IO_Exceptions;
with System.Direct_IO;
with Interfaces.C_Streams;
generic
type Element_Type is private;
package Ada.Direct_IO is
pragma Compile_Time_Warning
(Element_Type'Has_Access_Values,
"Element_Type for Direct_IO instance has access values");
pragma Compile_Time_Warning
(Element_Type'Has_Tagged_Values,
"Element_Type for Direct_IO instance has tagged values");
type File_Type is limited private;
type File_Mode is (In_File, Inout_File, Out_File);
-- The following representation clause allows the use of unchecked
-- conversion for rapid translation between the File_Mode type
-- used in this package and System.File_IO.
for File_Mode use
(In_File => 0, -- System.File_IO.File_Mode'Pos (In_File)
Inout_File => 1, -- System.File_IO.File_Mode'Pos (Inout_File);
Out_File => 2); -- System.File_IO.File_Mode'Pos (Out_File)
type Count is range 0 .. System.Direct_IO.Count'Last;
subtype Positive_Count is Count range 1 .. Count'Last;
---------------------
-- File Management --
---------------------
procedure Create
(File : in out File_Type;
Mode : File_Mode := Inout_File;
Name : String := "";
Form : String := "");
procedure Open
(File : in out File_Type;
Mode : File_Mode;
Name : String;
Form : String := "");
procedure Close (File : in out File_Type);
procedure Delete (File : in out File_Type);
procedure Reset (File : in out File_Type; Mode : File_Mode);
procedure Reset (File : in out File_Type);
function Mode (File : File_Type) return File_Mode;
function Name (File : File_Type) return String;
function Form (File : File_Type) return String;
function Is_Open (File : File_Type) return Boolean;
---------------------------------
-- Input and Output Operations --
---------------------------------
procedure Read
(File : File_Type;
Item : out Element_Type;
From : Positive_Count);
procedure Read
(File : File_Type;
Item : out Element_Type);
procedure Write
(File : File_Type;
Item : Element_Type;
To : Positive_Count);
procedure Write
(File : File_Type;
Item : Element_Type);
procedure Set_Index (File : File_Type; To : Positive_Count);
function Index (File : File_Type) return Positive_Count;
function Size (File : File_Type) return Count;
function End_Of_File (File : File_Type) return Boolean;
----------------
-- Exceptions --
----------------
Status_Error : exception renames IO_Exceptions.Status_Error;
Mode_Error : exception renames IO_Exceptions.Mode_Error;
Name_Error : exception renames IO_Exceptions.Name_Error;
Use_Error : exception renames IO_Exceptions.Use_Error;
Device_Error : exception renames IO_Exceptions.Device_Error;
End_Error : exception renames IO_Exceptions.End_Error;
Data_Error : exception renames IO_Exceptions.Data_Error;
private
-- 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 => Close,
External => "",
Mechanism => Reference);
pragma Export_Procedure
(Internal => Delete,
External => "",
Mechanism => Reference);
pragma Export_Procedure
(Internal => Reset,
External => "",
Parameter_Types => (File_Type),
Mechanism => Reference);
pragma Export_Procedure
(Internal => Reset,
External => "",
Parameter_Types => (File_Type, File_Mode),
Mechanism => (File => Reference));
type File_Type is new System.Direct_IO.File_Type;
Bytes : constant Interfaces.C_Streams.size_t :=
Interfaces.C_Streams.size_t'Max
(1, Element_Type'Max_Size_In_Storage_Elements);
-- Size of an element in storage units. The Max operation here is to ensure
-- that we allocate a single byte for zero-sized elements. It's a bit weird
-- to instantiate Direct_IO with zero sized elements, but it is legal and
-- this adjustment ensures that we don't get anomalous behavior.
pragma Inline (Close);
pragma Inline (Create);
pragma Inline (Delete);
pragma Inline (End_Of_File);
pragma Inline (Form);
pragma Inline (Index);
pragma Inline (Is_Open);
pragma Inline (Mode);
pragma Inline (Name);
pragma Inline (Open);
pragma Inline (Read);
pragma Inline (Reset);
pragma Inline (Set_Index);
pragma Inline (Size);
pragma Inline (Write);
end Ada.Direct_IO;
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