+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNAT RUNTIME COMPONENTS --
--- --
--- S Y S T E M . D I R E C T _ I O --
--- --
--- B o d y --
--- --
--- $Revision: 1.1.16.1 $
--- --
--- Copyright (C) 1992-1999 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, 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; use Ada.IO_Exceptions;
-with Interfaces.C_Streams; use Interfaces.C_Streams;
-with System; use System;
-with System.File_IO;
-with System.Soft_Links;
-with Unchecked_Deallocation;
-
-package body System.Direct_IO is
-
- package FIO renames System.File_IO;
- package SSL renames System.Soft_Links;
-
- subtype AP is FCB.AFCB_Ptr;
- use type FCB.Shared_Status_Type;
-
- -----------------------
- -- Local Subprograms --
- -----------------------
-
- procedure Set_Position (File : in File_Type);
- -- Sets file position pointer according to value of current index
-
- -------------------
- -- AFCB_Allocate --
- -------------------
-
- function AFCB_Allocate (Control_Block : Direct_AFCB) return FCB.AFCB_Ptr is
- begin
- return new Direct_AFCB;
- end AFCB_Allocate;
-
- ----------------
- -- AFCB_Close --
- ----------------
-
- -- No special processing required for Direct_IO close
-
- procedure AFCB_Close (File : access Direct_AFCB) is
- begin
- null;
- end AFCB_Close;
-
- ---------------
- -- AFCB_Free --
- ---------------
-
- procedure AFCB_Free (File : access Direct_AFCB) is
-
- type FCB_Ptr is access all Direct_AFCB;
-
- FT : FCB_Ptr := FCB_Ptr (File);
-
- procedure Free is new
- Unchecked_Deallocation (Direct_AFCB, FCB_Ptr);
-
- begin
- Free (FT);
- end AFCB_Free;
-
- ------------
- -- Create --
- ------------
-
- procedure Create
- (File : in out File_Type;
- Mode : in FCB.File_Mode := FCB.Inout_File;
- Name : in String := "";
- Form : in String := "")
- is
- File_Control_Block : Direct_AFCB;
-
- begin
- FIO.Open (File_Ptr => AP (File),
- Dummy_FCB => File_Control_Block,
- Mode => Mode,
- Name => Name,
- Form => Form,
- Amethod => 'D',
- Creat => True,
- Text => False);
- end Create;
-
- -----------------
- -- End_Of_File --
- -----------------
-
- function End_Of_File (File : in File_Type) return Boolean is
- begin
- FIO.Check_Read_Status (AP (File));
- return Count (File.Index) > Size (File);
- end End_Of_File;
-
- -----------
- -- Index --
- -----------
-
- function Index (File : in File_Type) return Positive_Count is
- begin
- FIO.Check_File_Open (AP (File));
- return Count (File.Index);
- end Index;
-
- ----------
- -- Open --
- ----------
-
- procedure Open
- (File : in out File_Type;
- Mode : in FCB.File_Mode;
- Name : in String;
- Form : in String := "")
- is
- File_Control_Block : Direct_AFCB;
-
- begin
- FIO.Open (File_Ptr => AP (File),
- Dummy_FCB => File_Control_Block,
- Mode => Mode,
- Name => Name,
- Form => Form,
- Amethod => 'D',
- Creat => False,
- Text => False);
- end Open;
-
- ----------
- -- Read --
- ----------
-
- procedure Read
- (File : in File_Type;
- Item : Address;
- Size : in Interfaces.C_Streams.size_t;
- From : in Positive_Count)
- is
- begin
- Set_Index (File, From);
- Read (File, Item, Size);
- end Read;
-
- procedure Read
- (File : in File_Type;
- Item : Address;
- Size : in Interfaces.C_Streams.size_t)
- is
- begin
- FIO.Check_Read_Status (AP (File));
-
- -- If last operation was not a read, 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_Read
- or else File.Shared_Status = FCB.Yes
- then
- if End_Of_File (File) then
- raise End_Error;
- end if;
-
- Locked_Processing : begin
- SSL.Lock_Task.all;
- Set_Position (File);
- FIO.Read_Buf (AP (File), Item, Size);
- SSL.Unlock_Task.all;
-
- exception
- when others =>
- SSL.Unlock_Task.all;
- raise;
- end Locked_Processing;
-
- else
- FIO.Read_Buf (AP (File), Item, Size);
- end if;
-
- File.Index := File.Index + 1;
-
- -- Set last operation to read, unless we did not read a full record
- -- (happens with the variant record case) in which case we set the
- -- last operation as other, to force the file position to be reset
- -- on the next read.
-
- if File.Bytes = Size then
- File.Last_Op := Op_Read;
- else
- File.Last_Op := Op_Other;
- end if;
- end Read;
-
- -- The following is the required overriding for Stream.Read, which is
- -- not used, since we do not do Stream operations on Direct_IO files.
-
- procedure Read
- (File : in out Direct_AFCB;
- Item : out Ada.Streams.Stream_Element_Array;
- Last : out Ada.Streams.Stream_Element_Offset)
- is
- begin
- raise Program_Error;
- end Read;
-
- -----------
- -- Reset --
- -----------
-
- procedure Reset (File : in out File_Type; Mode : in FCB.File_Mode) is
- begin
- FIO.Reset (AP (File), Mode);
- File.Index := 1;
- File.Last_Op := Op_Read;
- end Reset;
-
- procedure Reset (File : in out File_Type) is
- begin
- FIO.Reset (AP (File));
- File.Index := 1;
- File.Last_Op := Op_Read;
- end Reset;
-
- ---------------
- -- Set_Index --
- ---------------
-
- procedure Set_Index (File : in File_Type; To : in Positive_Count) is
- begin
- FIO.Check_File_Open (AP (File));
- File.Index := Count (To);
- File.Last_Op := Op_Other;
- end Set_Index;
-
- ------------------
- -- Set_Position --
- ------------------
-
- procedure Set_Position (File : in File_Type) is
- begin
- if fseek
- (File.Stream, long (File.Bytes) *
- long (File.Index - 1), SEEK_SET) /= 0
- then
- raise Use_Error;
- end if;
- end Set_Position;
-
- ----------
- -- Size --
- ----------
-
- function Size (File : in File_Type) return Count is
- begin
- FIO.Check_File_Open (AP (File));
- File.Last_Op := Op_Other;
-
- if fseek (File.Stream, 0, SEEK_END) /= 0 then
- raise Device_Error;
- end if;
-
- return Count (ftell (File.Stream) / long (File.Bytes));
- end Size;
-
- -----------
- -- Write --
- -----------
-
- procedure Write
- (File : File_Type;
- Item : Address;
- Size : in Interfaces.C_Streams.size_t;
- Zeroes : System.Storage_Elements.Storage_Array)
-
- is
- procedure Do_Write;
- -- Do the actual write
-
- procedure Do_Write is
- begin
- FIO.Write_Buf (AP (File), Item, Size);
-
- -- If we did not write the whole record (happens with the variant
- -- record case), then fill out the rest of the record with zeroes.
- -- This is cleaner in any case, and is required for the last
- -- record, since otherwise the length of the file is wrong.
-
- if File.Bytes > Size then
- FIO.Write_Buf (AP (File), Zeroes'Address, File.Bytes - Size);
- end if;
- end Do_Write;
-
- -- Start of processing for Write
-
- 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);
- Do_Write;
- SSL.Unlock_Task.all;
-
- exception
- when others =>
- SSL.Unlock_Task.all;
- raise;
- end Locked_Processing;
-
- else
- Do_Write;
- end if;
-
- File.Index := File.Index + 1;
-
- -- Set last operation to write, unless we did not read a full record
- -- (happens with the variant record case) in which case we set the
- -- last operation as other, to force the file position to be reset
- -- on the next write.
-
- if File.Bytes = Size then
- File.Last_Op := Op_Write;
- else
- File.Last_Op := Op_Other;
- end if;
- end Write;
-
- -- The following is the required overriding for Stream.Write, which is
- -- not used, since we do not do Stream operations on Direct_IO files.
-
- procedure Write
- (File : in out Direct_AFCB;
- Item : in Ada.Streams.Stream_Element_Array)
- is
- begin
- raise Program_Error;
- end Write;
-
-end System.Direct_IO;
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