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Diffstat (limited to 'gcc/ada/a-ststio.ads')
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diff --git a/gcc/ada/a-ststio.ads b/gcc/ada/a-ststio.ads new file mode 100644 index 000000000..63a5e8000 --- /dev/null +++ b/gcc/ada/a-ststio.ads @@ -0,0 +1,221 @@ +------------------------------------------------------------------------------ +-- -- +-- 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) 1992-2009, 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.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 + + -- 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)); + pragma Export_Procedure + (Internal => Set_Mode, + External => "", + Mechanism => (File => Reference)); + + 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 : not null access Stream_AFCB); + procedure AFCB_Free (File : not null 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; |