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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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