+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- 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 --
--- --
--- $Revision: 1.1.16.2 $
--- --
--- Copyright (C) 1992-1997 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, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, 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 : in File_Mode := Out_File;
- Name : in String := "";
- Form : in String := "");
-
- procedure Open
- (File : in out File_Type;
- Mode : in File_Mode;
- Name : in String;
- Form : in 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);
-
- 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 Is_Open (File : in File_Type) return Boolean;
- function End_Of_File (File : in File_Type) return Boolean;
-
- function Stream (File : in File_Type) return Stream_Access;
-
- -----------------------------
- -- Input-Output Operations --
- -----------------------------
-
- procedure Read
- (File : in File_Type;
- Item : out Stream_Element_Array;
- Last : out Stream_Element_Offset;
- From : in Positive_Count);
-
- procedure Read
- (File : in File_Type;
- Item : out Stream_Element_Array;
- Last : out Stream_Element_Offset);
-
- procedure Write
- (File : in File_Type;
- Item : in Stream_Element_Array;
- To : in Positive_Count);
-
- procedure Write
- (File : in File_Type;
- Item : in Stream_Element_Array);
-
- ----------------------------------------
- -- Operations on Position within File --
- ----------------------------------------
-
- procedure Set_Index (File : in File_Type; To : in Positive_Count);
-
- function Index (File : in File_Type) return Positive_Count;
- function Size (File : in File_Type) return Count;
-
- procedure Set_Mode (File : in out File_Type; Mode : in File_Mode);
-
- procedure Flush (File : in out 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 : in Ada.Streams.Stream_Element_Array);
- -- Write operation used when Stream_IO file is treated directly as Stream
-
-end Ada.Streams.Stream_IO;
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