Subversion Repositories openrisc

------------------------------------------------------------------------------

--                                                                          --

--                         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;