194 lines
7.7 KiB
Ada
194 lines
7.7 KiB
Ada
------------------------------------------------------------------------------
|
|
-- --
|
|
-- GNAT RUN-TIME COMPONENTS --
|
|
-- --
|
|
-- A D A . S T R E A M S . S T R E A M _ I O --
|
|
-- --
|
|
-- S p e c --
|
|
-- --
|
|
-- Copyright (C) 1992-2006, 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 2, 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, 51 Franklin Street, Fifth Floor, --
|
|
-- Boston, MA 02110-1301, USA. --
|
|
-- --
|
|
-- 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. --
|
|
-- --
|
|
-- 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.File_Control_Block;
|
|
|
|
package Ada.Streams.Stream_IO is
|
|
|
|
type Stream_Access is access all Root_Stream_Type'Class;
|
|
|
|
type File_Type is limited private;
|
|
|
|
type File_Mode is (In_File, Out_File, Append_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)
|
|
Out_File => 2, -- System.File_IO.File_Mode'Pos (Out_File)
|
|
Append_File => 3); -- System.File_IO.File_Mode'Pos (Append_File)
|
|
|
|
type Count is new Stream_Element_Offset
|
|
range 0 .. Stream_Element_Offset'Last;
|
|
|
|
subtype Positive_Count is Count range 1 .. Count'Last;
|
|
-- Index into file, in stream elements
|
|
|
|
---------------------
|
|
-- File Management --
|
|
---------------------
|
|
|
|
procedure Create
|
|
(File : in out File_Type;
|
|
Mode : File_Mode := Out_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;
|
|
function End_Of_File (File : File_Type) return Boolean;
|
|
|
|
function Stream (File : File_Type) return Stream_Access;
|
|
|
|
-----------------------------
|
|
-- Input-Output Operations --
|
|
-----------------------------
|
|
|
|
procedure Read
|
|
(File : File_Type;
|
|
Item : out Stream_Element_Array;
|
|
Last : out Stream_Element_Offset;
|
|
From : Positive_Count);
|
|
|
|
procedure Read
|
|
(File : File_Type;
|
|
Item : out Stream_Element_Array;
|
|
Last : out Stream_Element_Offset);
|
|
|
|
procedure Write
|
|
(File : File_Type;
|
|
Item : Stream_Element_Array;
|
|
To : Positive_Count);
|
|
|
|
procedure Write
|
|
(File : File_Type;
|
|
Item : Stream_Element_Array);
|
|
|
|
----------------------------------------
|
|
-- Operations on Position within File --
|
|
----------------------------------------
|
|
|
|
procedure Set_Index (File : File_Type; To : Positive_Count);
|
|
|
|
function Index (File : File_Type) return Positive_Count;
|
|
function Size (File : File_Type) return Count;
|
|
|
|
procedure Set_Mode (File : in out File_Type; Mode : File_Mode);
|
|
|
|
-- Note: The parameter file is IN OUT in the RM, but this is clearly
|
|
-- an oversight, and was intended to be IN, see AI95-00057.
|
|
|
|
procedure Flush (File : File_Type);
|
|
|
|
----------------
|
|
-- 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
|
|
package FCB renames System.File_Control_Block;
|
|
|
|
-----------------------------
|
|
-- Stream_IO Control Block --
|
|
-----------------------------
|
|
|
|
type Operation is (Op_Read, Op_Write, Op_Other);
|
|
-- Type used to record last operation (to optimize sequential operations)
|
|
|
|
type Stream_AFCB is new FCB.AFCB with record
|
|
Index : Count := 1;
|
|
-- Current Index value
|
|
|
|
File_Size : Stream_Element_Offset := -1;
|
|
-- Cached value of File_Size, so that we do not keep recomputing it
|
|
-- when not necessary (otherwise End_Of_File becomes gruesomely slow).
|
|
-- A value of minus one means that there is no cached value.
|
|
|
|
Last_Op : Operation := Op_Other;
|
|
-- Last operation performed on file, used to avoid unnecessary
|
|
-- repositioning between successive read or write operations.
|
|
|
|
Update_Mode : Boolean := False;
|
|
-- Set if the mode is changed from write to read or vice versa.
|
|
-- Indicates that the file has been reopened in update mode.
|
|
|
|
end record;
|
|
|
|
type File_Type is access all Stream_AFCB;
|
|
|
|
function AFCB_Allocate (Control_Block : Stream_AFCB) return FCB.AFCB_Ptr;
|
|
|
|
procedure AFCB_Close (File : access Stream_AFCB);
|
|
procedure AFCB_Free (File : access Stream_AFCB);
|
|
|
|
procedure Read
|
|
(File : in out Stream_AFCB;
|
|
Item : out Ada.Streams.Stream_Element_Array;
|
|
Last : out Ada.Streams.Stream_Element_Offset);
|
|
-- Read operation used when Stream_IO file is treated directly as Stream
|
|
|
|
procedure Write
|
|
(File : in out Stream_AFCB;
|
|
Item : Ada.Streams.Stream_Element_Array);
|
|
-- Write operation used when Stream_IO file is treated directly as Stream
|
|
|
|
end Ada.Streams.Stream_IO;
|