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Diffstat (limited to 'gcc/ada/a-ststio.ads')
| -rw-r--r-- | gcc/ada/a-ststio.ads | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/gcc/ada/a-ststio.ads b/gcc/ada/a-ststio.ads new file mode 100644 index 00000000000..5f225ea970d --- /dev/null +++ b/gcc/ada/a-ststio.ads @@ -0,0 +1,192 @@ +------------------------------------------------------------------------------ +-- -- +-- 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: 1.14 $ -- +-- -- +-- 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. -- +-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). -- +-- -- +------------------------------------------------------------------------------ + +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; |