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Diffstat (limited to 'gcc-4.2.1/gcc/ada/s-direio.ads')
| -rw-r--r-- | gcc-4.2.1/gcc/ada/s-direio.ads | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/gcc-4.2.1/gcc/ada/s-direio.ads b/gcc-4.2.1/gcc/ada/s-direio.ads new file mode 100644 index 000000000..756bcb252 --- /dev/null +++ b/gcc-4.2.1/gcc/ada/s-direio.ads @@ -0,0 +1,128 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT RUN-TIME COMPONENTS -- +-- -- +-- S Y S T E M . D I R E C T _ I O -- +-- -- +-- S p e c -- +-- -- +-- Copyright (C) 1992-2006, Free Software Foundation, Inc. -- +-- -- +-- 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. -- +-- -- +------------------------------------------------------------------------------ + +-- This package contains the declaration of the control block used for +-- Direct_IO. This must be declared at the outer library level. It also +-- contains code that is shared between instances of Direct_IO. + +with Interfaces.C_Streams; +with Ada.Streams; +with System.File_Control_Block; +with System.Storage_Elements; + +package System.Direct_IO is + + package FCB renames System.File_Control_Block; + + type Operation is (Op_Read, Op_Write, Op_Other); + -- Type used to record last operation (to optimize sequential operations) + + subtype Count is Interfaces.C_Streams.long; + -- The Count type in each instantiation is derived from this type + + subtype Positive_Count is Count range 1 .. Count'Last; + + type Direct_AFCB is new FCB.AFCB with record + Index : Count := 1; + -- Current Index value + + Bytes : Interfaces.C_Streams.size_t; + -- Length of item in bytes (set from inside generic template) + + Last_Op : Operation := Op_Other; + -- Last operation performed on file, used to avoid unnecessary + -- repositioning between successive read or write operations. + end record; + + function AFCB_Allocate (Control_Block : Direct_AFCB) return FCB.AFCB_Ptr; + + procedure AFCB_Close (File : access Direct_AFCB); + procedure AFCB_Free (File : access Direct_AFCB); + + procedure Read + (File : in out Direct_AFCB; + Item : out Ada.Streams.Stream_Element_Array; + Last : out Ada.Streams.Stream_Element_Offset); + -- Required overriding of Read, not actually used for Direct_IO + + procedure Write + (File : in out Direct_AFCB; + Item : Ada.Streams.Stream_Element_Array); + -- Required overriding of Write, not actually used for Direct_IO + + type File_Type is access all Direct_AFCB; + -- File_Type in individual instantiations is derived from this type + + procedure Create + (File : in out File_Type; + Mode : FCB.File_Mode := FCB.Inout_File; + Name : String := ""; + Form : String := ""); + + function End_Of_File (File : File_Type) return Boolean; + + function Index (File : File_Type) return Positive_Count; + + procedure Open + (File : in out File_Type; + Mode : FCB.File_Mode; + Name : String; + Form : String := ""); + + procedure Read + (File : File_Type; + Item : System.Address; + Size : Interfaces.C_Streams.size_t; + From : Positive_Count); + + procedure Read + (File : File_Type; + Item : System.Address; + Size : Interfaces.C_Streams.size_t); + + procedure Reset (File : in out File_Type; Mode : FCB.File_Mode); + + procedure Reset (File : in out File_Type); + + procedure Set_Index (File : File_Type; To : Positive_Count); + + function Size (File : File_Type) return Count; + + procedure Write + (File : File_Type; + Item : System.Address; + Size : Interfaces.C_Streams.size_t; + Zeroes : System.Storage_Elements.Storage_Array); + -- Note: Zeroes is the buffer of zeroes used to fill out partial records + +end System.Direct_IO; |