-- --
-- S p e c --
-- --
--- --
--- Copyright (C) 1992-1999 Free Software Foundation, Inc. --
+-- 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 --
-- --
-- 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 2, or (at your option) any later ver- --
+-- 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. See the GNU General Public License --
--- for more details. You should have received a copy of the GNU General --
--- Public License distributed with GNAT; see file COPYING. If not, write --
--- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, USA. --
+-- 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. --
-- --
--- As a special exception, if other files instantiate generics from this --
--- unit, or you link this unit with other files to produce an executable, --
--- this unit does not by itself cause the resulting executable to be --
--- covered by the GNU General Public License. This exception does not --
--- however invalidate any other reasons why the executable file might be --
--- covered by the GNU Public License. --
+-- 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;
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);
-- 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)
+ (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;
procedure Create
(File : in out File_Type;
- Mode : in File_Mode := Inout_File;
- Name : in String := "";
- Form : in String := "");
+ Mode : File_Mode := Inout_File;
+ Name : String := "";
+ Form : String := "");
procedure Open
(File : in out File_Type;
- Mode : in File_Mode;
- Name : in String;
- Form : in String := "");
+ 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 : in File_Mode);
+ procedure Reset (File : in out File_Type; Mode : File_Mode);
procedure Reset (File : in out File_Type);
- function Mode (File : in File_Type) return File_Mode;
- function Name (File : in File_Type) return String;
- function Form (File : in File_Type) return String;
+ 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 : in File_Type) return Boolean;
+ function Is_Open (File : File_Type) return Boolean;
---------------------------------
-- Input and Output Operations --
---------------------------------
procedure Read
- (File : in File_Type;
+ (File : File_Type;
Item : out Element_Type;
- From : in Positive_Count);
+ From : Positive_Count);
procedure Read
- (File : in File_Type;
+ (File : File_Type;
Item : out Element_Type);
procedure Write
- (File : in File_Type;
- Item : in Element_Type;
- To : in Positive_Count);
+ (File : File_Type;
+ Item : Element_Type;
+ To : Positive_Count);
procedure Write
- (File : in File_Type;
- Item : in Element_Type);
+ (File : File_Type;
+ Item : Element_Type);
- procedure Set_Index (File : in File_Type; To : in Positive_Count);
+ procedure Set_Index (File : File_Type; To : Positive_Count);
- function Index (File : in File_Type) return Positive_Count;
- function Size (File : in File_Type) return Count;
+ function Index (File : File_Type) return Positive_Count;
+ function Size (File : File_Type) return Count;
- function End_Of_File (File : in File_Type) return Boolean;
+ function End_Of_File (File : File_Type) return Boolean;
----------------
-- Exceptions --
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 :=
- Element_Type'Max_Size_In_Storage_Elements;
- -- Size of an element in storage units
+ 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);
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