491 lines
14 KiB
Ada
491 lines
14 KiB
Ada
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------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- A D A . S T R E A M S . S T R E A M _ I O --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1992-2014, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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with Interfaces.C_Streams; use Interfaces.C_Streams;
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with System; use System;
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with System.Communication; use System.Communication;
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with System.File_IO;
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with System.Soft_Links;
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with System.CRTL;
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with Ada.Unchecked_Conversion;
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with Ada.Unchecked_Deallocation;
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package body Ada.Streams.Stream_IO is
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package FIO renames System.File_IO;
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package SSL renames System.Soft_Links;
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subtype AP is FCB.AFCB_Ptr;
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function To_FCB is new Ada.Unchecked_Conversion (File_Mode, FCB.File_Mode);
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function To_SIO is new Ada.Unchecked_Conversion (FCB.File_Mode, File_Mode);
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use type FCB.File_Mode;
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use type FCB.Shared_Status_Type;
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-----------------------
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-- Local Subprograms --
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-----------------------
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procedure Set_Position (File : File_Type);
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-- Sets file position pointer according to value of current index
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-------------------
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-- AFCB_Allocate --
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-------------------
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function AFCB_Allocate (Control_Block : Stream_AFCB) return FCB.AFCB_Ptr is
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pragma Warnings (Off, Control_Block);
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begin
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return new Stream_AFCB;
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end AFCB_Allocate;
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----------------
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-- AFCB_Close --
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----------------
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-- No special processing required for closing Stream_IO file
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procedure AFCB_Close (File : not null access Stream_AFCB) is
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pragma Warnings (Off, File);
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begin
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null;
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end AFCB_Close;
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---------------
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-- AFCB_Free --
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---------------
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procedure AFCB_Free (File : not null access Stream_AFCB) is
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type FCB_Ptr is access all Stream_AFCB;
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FT : FCB_Ptr := FCB_Ptr (File);
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procedure Free is new Ada.Unchecked_Deallocation (Stream_AFCB, FCB_Ptr);
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begin
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Free (FT);
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end AFCB_Free;
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-----------
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-- Close --
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-----------
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procedure Close (File : in out File_Type) is
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begin
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FIO.Close (AP (File)'Unrestricted_Access);
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end Close;
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------------
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-- Create --
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------------
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procedure Create
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(File : in out File_Type;
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Mode : File_Mode := Out_File;
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Name : String := "";
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Form : String := "")
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is
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Dummy_File_Control_Block : Stream_AFCB;
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pragma Warnings (Off, Dummy_File_Control_Block);
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-- Yes, we know this is never assigned a value, only the tag
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-- is used for dispatching purposes, so that's expected.
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begin
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FIO.Open (File_Ptr => AP (File),
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Dummy_FCB => Dummy_File_Control_Block,
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Mode => To_FCB (Mode),
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Name => Name,
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Form => Form,
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Amethod => 'S',
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Creat => True,
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Text => False);
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File.Last_Op := Op_Write;
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end Create;
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------------
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-- Delete --
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------------
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procedure Delete (File : in out File_Type) is
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begin
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FIO.Delete (AP (File)'Unrestricted_Access);
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end Delete;
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-----------------
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-- End_Of_File --
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-----------------
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function End_Of_File (File : File_Type) return Boolean is
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begin
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FIO.Check_Read_Status (AP (File));
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return File.Index > Size (File);
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end End_Of_File;
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-----------
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-- Flush --
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-----------
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procedure Flush (File : File_Type) is
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begin
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FIO.Flush (AP (File));
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end Flush;
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----------
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-- Form --
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----------
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function Form (File : File_Type) return String is
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begin
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return FIO.Form (AP (File));
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end Form;
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-----------
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-- Index --
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-----------
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function Index (File : File_Type) return Positive_Count is
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begin
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FIO.Check_File_Open (AP (File));
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return File.Index;
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end Index;
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-------------
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-- Is_Open --
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-------------
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function Is_Open (File : File_Type) return Boolean is
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begin
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return FIO.Is_Open (AP (File));
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end Is_Open;
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----------
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-- Mode --
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----------
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function Mode (File : File_Type) return File_Mode is
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begin
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return To_SIO (FIO.Mode (AP (File)));
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end Mode;
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----------
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-- Name --
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----------
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function Name (File : File_Type) return String is
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begin
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return FIO.Name (AP (File));
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end Name;
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----------
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-- Open --
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----------
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procedure Open
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(File : in out File_Type;
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Mode : File_Mode;
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Name : String;
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Form : String := "")
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is
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Dummy_File_Control_Block : Stream_AFCB;
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pragma Warnings (Off, Dummy_File_Control_Block);
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-- Yes, we know this is never assigned a value, only the tag
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-- is used for dispatching purposes, so that's expected.
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begin
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FIO.Open (File_Ptr => AP (File),
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Dummy_FCB => Dummy_File_Control_Block,
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Mode => To_FCB (Mode),
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Name => Name,
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Form => Form,
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Amethod => 'S',
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Creat => False,
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Text => False);
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-- Ensure that the stream index is set properly (e.g., for Append_File)
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Reset (File, Mode);
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-- Set last operation. The purpose here is to ensure proper handling
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-- of the initial operation. In general, a write after a read requires
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-- resetting and doing a seek, so we set the last operation as Read
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-- for an In_Out file, but for an Out file we set the last operation
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-- to Op_Write, since in this case it is not necessary to do a seek
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-- (and furthermore there are situations (such as the case of writing
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-- a sequential Posix FIFO file) where the lseek would cause problems.
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File.Last_Op := (if Mode = Out_File then Op_Write else Op_Read);
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end Open;
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----------
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-- Read --
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----------
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procedure Read
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(File : File_Type;
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Item : out Stream_Element_Array;
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Last : out Stream_Element_Offset;
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From : Positive_Count)
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is
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begin
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Set_Index (File, From);
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Read (File, Item, Last);
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end Read;
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procedure Read
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(File : File_Type;
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Item : out Stream_Element_Array;
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Last : out Stream_Element_Offset)
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is
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Nread : size_t;
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begin
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FIO.Check_Read_Status (AP (File));
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-- If last operation was not a read, or if in file sharing mode,
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-- then reset the physical pointer of the file to match the index
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-- We lock out task access over the two operations in this case.
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if File.Last_Op /= Op_Read
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or else File.Shared_Status = FCB.Yes
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then
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Locked_Processing : begin
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SSL.Lock_Task.all;
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Set_Position (File);
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FIO.Read_Buf (AP (File), Item'Address, Item'Length, Nread);
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SSL.Unlock_Task.all;
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exception
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when others =>
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SSL.Unlock_Task.all;
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raise;
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end Locked_Processing;
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else
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FIO.Read_Buf (AP (File), Item'Address, Item'Length, Nread);
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end if;
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File.Index := File.Index + Count (Nread);
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File.Last_Op := Op_Read;
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Last := Last_Index (Item'First, Nread);
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end Read;
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-- This version of Read is the primitive operation on the underlying
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-- Stream type, used when a Stream_IO file is treated as a Stream
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procedure Read
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(File : in out Stream_AFCB;
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Item : out Ada.Streams.Stream_Element_Array;
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Last : out Ada.Streams.Stream_Element_Offset)
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is
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begin
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Read (File'Unchecked_Access, Item, Last);
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end Read;
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-----------
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-- Reset --
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-----------
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procedure Reset (File : in out File_Type; Mode : File_Mode) is
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begin
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FIO.Check_File_Open (AP (File));
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-- Reset file index to start of file for read/write cases. For
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-- the append case, the Set_Mode call repositions the index.
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File.Index := 1;
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Set_Mode (File, Mode);
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end Reset;
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procedure Reset (File : in out File_Type) is
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begin
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Reset (File, To_SIO (File.Mode));
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end Reset;
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---------------
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-- Set_Index --
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---------------
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procedure Set_Index (File : File_Type; To : Positive_Count) is
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begin
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FIO.Check_File_Open (AP (File));
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File.Index := Count (To);
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File.Last_Op := Op_Other;
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end Set_Index;
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--------------
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-- Set_Mode --
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--------------
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procedure Set_Mode (File : in out File_Type; Mode : File_Mode) is
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begin
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FIO.Check_File_Open (AP (File));
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-- If we are switching from read to write, or vice versa, and
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-- we are not already open in update mode, then reopen in update
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-- mode now. Note that we can use Inout_File as the mode for the
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-- call since File_IO handles all modes for all file types.
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if ((File.Mode = FCB.In_File) /= (Mode = In_File))
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and then not File.Update_Mode
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then
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FIO.Reset (AP (File)'Unrestricted_Access, FCB.Inout_File);
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File.Update_Mode := True;
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end if;
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-- Set required mode and position to end of file if append mode
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File.Mode := To_FCB (Mode);
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FIO.Append_Set (AP (File));
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if File.Mode = FCB.Append_File then
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if Standard'Address_Size = 64 then
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File.Index := Count (ftell64 (File.Stream)) + 1;
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else
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File.Index := Count (ftell (File.Stream)) + 1;
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end if;
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end if;
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File.Last_Op := Op_Other;
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end Set_Mode;
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------------------
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-- Set_Position --
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------------------
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procedure Set_Position (File : File_Type) is
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use type System.CRTL.int64;
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R : int;
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begin
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R := fseek64 (File.Stream, System.CRTL.int64 (File.Index) - 1, SEEK_SET);
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if R /= 0 then
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raise Use_Error;
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end if;
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end Set_Position;
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----------
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-- Size --
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----------
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function Size (File : File_Type) return Count is
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begin
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FIO.Check_File_Open (AP (File));
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if File.File_Size = -1 then
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File.Last_Op := Op_Other;
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if fseek64 (File.Stream, 0, SEEK_END) /= 0 then
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raise Device_Error;
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end if;
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File.File_Size := Stream_Element_Offset (ftell64 (File.Stream));
|
||
|
|
|
||
|
|
if File.File_Size = -1 then
|
||
|
|
raise Use_Error;
|
||
|
|
end if;
|
||
|
|
end if;
|
||
|
|
|
||
|
|
return Count (File.File_Size);
|
||
|
|
end Size;
|
||
|
|
|
||
|
|
------------
|
||
|
|
-- Stream --
|
||
|
|
------------
|
||
|
|
|
||
|
|
function Stream (File : File_Type) return Stream_Access is
|
||
|
|
begin
|
||
|
|
FIO.Check_File_Open (AP (File));
|
||
|
|
return Stream_Access (File);
|
||
|
|
end Stream;
|
||
|
|
|
||
|
|
-----------
|
||
|
|
-- Write --
|
||
|
|
-----------
|
||
|
|
|
||
|
|
procedure Write
|
||
|
|
(File : File_Type;
|
||
|
|
Item : Stream_Element_Array;
|
||
|
|
To : Positive_Count)
|
||
|
|
is
|
||
|
|
begin
|
||
|
|
Set_Index (File, To);
|
||
|
|
Write (File, Item);
|
||
|
|
end Write;
|
||
|
|
|
||
|
|
procedure Write
|
||
|
|
(File : File_Type;
|
||
|
|
Item : Stream_Element_Array)
|
||
|
|
is
|
||
|
|
begin
|
||
|
|
FIO.Check_Write_Status (AP (File));
|
||
|
|
|
||
|
|
-- If last operation was not a write, or if in file sharing mode,
|
||
|
|
-- then reset the physical pointer of the file to match the index
|
||
|
|
-- We lock out task access over the two operations in this case.
|
||
|
|
|
||
|
|
if File.Last_Op /= Op_Write
|
||
|
|
or else File.Shared_Status = FCB.Yes
|
||
|
|
then
|
||
|
|
Locked_Processing : begin
|
||
|
|
SSL.Lock_Task.all;
|
||
|
|
Set_Position (File);
|
||
|
|
FIO.Write_Buf (AP (File), Item'Address, Item'Length);
|
||
|
|
SSL.Unlock_Task.all;
|
||
|
|
|
||
|
|
exception
|
||
|
|
when others =>
|
||
|
|
SSL.Unlock_Task.all;
|
||
|
|
raise;
|
||
|
|
end Locked_Processing;
|
||
|
|
|
||
|
|
else
|
||
|
|
FIO.Write_Buf (AP (File), Item'Address, Item'Length);
|
||
|
|
end if;
|
||
|
|
|
||
|
|
File.Index := File.Index + Item'Length;
|
||
|
|
File.Last_Op := Op_Write;
|
||
|
|
File.File_Size := -1;
|
||
|
|
end Write;
|
||
|
|
|
||
|
|
-- This version of Write is the primitive operation on the underlying
|
||
|
|
-- Stream type, used when a Stream_IO file is treated as a Stream
|
||
|
|
|
||
|
|
procedure Write
|
||
|
|
(File : in out Stream_AFCB;
|
||
|
|
Item : Ada.Streams.Stream_Element_Array)
|
||
|
|
is
|
||
|
|
begin
|
||
|
|
Write (File'Unchecked_Access, Item);
|
||
|
|
end Write;
|
||
|
|
|
||
|
|
end Ada.Streams.Stream_IO;
|