------------------------------------------------------------------------------
-- --
--- GNAT RUNTIME COMPONENTS --
+-- GNAT RUN-TIME COMPONENTS --
-- --
-- A D A . S T R E A M S . S T R E A M _ I O --
-- --
-- B o d y --
-- --
--- Copyright (C) 1992-2001, Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2007, 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- --
-- 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. --
+-- 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, --
-- --
------------------------------------------------------------------------------
-with Interfaces.C_Streams; use Interfaces.C_Streams;
-with System; use System;
+with Interfaces.C_Streams; use Interfaces.C_Streams;
+
+with System; use System;
with System.File_IO;
with System.Soft_Links;
-with Unchecked_Conversion;
-with Unchecked_Deallocation;
+with System.CRTL;
+
+with Ada.Unchecked_Conversion;
+with Ada.Unchecked_Deallocation;
package body Ada.Streams.Stream_IO is
subtype AP is FCB.AFCB_Ptr;
- function To_FCB is new Unchecked_Conversion (File_Mode, FCB.File_Mode);
- function To_SIO is new Unchecked_Conversion (FCB.File_Mode, File_Mode);
+ function To_FCB is new Ada.Unchecked_Conversion (File_Mode, FCB.File_Mode);
+ function To_SIO is new Ada.Unchecked_Conversion (FCB.File_Mode, File_Mode);
use type FCB.File_Mode;
use type FCB.Shared_Status_Type;
-- Local Subprograms --
-----------------------
- procedure Set_Position (File : in File_Type);
+ procedure Set_Position (File : File_Type);
-- Sets file position pointer according to value of current index
-------------------
function AFCB_Allocate (Control_Block : Stream_AFCB) return FCB.AFCB_Ptr is
pragma Warnings (Off, Control_Block);
-
begin
return new Stream_AFCB;
end AFCB_Allocate;
-- No special processing required for closing Stream_IO file
- procedure AFCB_Close (File : access Stream_AFCB) is
+ procedure AFCB_Close (File : not null access Stream_AFCB) is
pragma Warnings (Off, File);
-
begin
null;
end AFCB_Close;
-- AFCB_Free --
---------------
- procedure AFCB_Free (File : access Stream_AFCB) is
+ procedure AFCB_Free (File : not null access Stream_AFCB) is
type FCB_Ptr is access all Stream_AFCB;
FT : FCB_Ptr := FCB_Ptr (File);
- procedure Free is new Unchecked_Deallocation (Stream_AFCB, FCB_Ptr);
+ procedure Free is new Ada.Unchecked_Deallocation (Stream_AFCB, FCB_Ptr);
begin
Free (FT);
procedure Create
(File : in out File_Type;
- Mode : in File_Mode := Out_File;
- Name : in String := "";
- Form : in String := "")
+ Mode : File_Mode := Out_File;
+ Name : String := "";
+ Form : String := "")
is
- File_Control_Block : Stream_AFCB;
+ Dummy_File_Control_Block : Stream_AFCB;
+ pragma Warnings (Off, Dummy_File_Control_Block);
+ -- Yes, we know this is never assigned a value, only the tag
+ -- is used for dispatching purposes, so that's expected.
begin
FIO.Open (File_Ptr => AP (File),
- Dummy_FCB => File_Control_Block,
+ Dummy_FCB => Dummy_File_Control_Block,
Mode => To_FCB (Mode),
Name => Name,
Form => Form,
-- End_Of_File --
-----------------
- function End_Of_File (File : in File_Type) return Boolean is
+ function End_Of_File (File : File_Type) return Boolean is
begin
FIO.Check_Read_Status (AP (File));
return Count (File.Index) > Size (File);
-- Form --
----------
- function Form (File : in File_Type) return String is
+ function Form (File : File_Type) return String is
begin
return FIO.Form (AP (File));
end Form;
-- Index --
-----------
- function Index (File : in File_Type) return Positive_Count is
+ function Index (File : File_Type) return Positive_Count is
begin
FIO.Check_File_Open (AP (File));
return Count (File.Index);
-- Is_Open --
-------------
- function Is_Open (File : in File_Type) return Boolean is
+ function Is_Open (File : File_Type) return Boolean is
begin
return FIO.Is_Open (AP (File));
end Is_Open;
-- Mode --
----------
- function Mode (File : in File_Type) return File_Mode is
+ function Mode (File : File_Type) return File_Mode is
begin
return To_SIO (FIO.Mode (AP (File)));
end Mode;
-- Name --
----------
- function Name (File : in File_Type) return String is
+ function Name (File : File_Type) return String is
begin
return FIO.Name (AP (File));
end Name;
procedure Open
(File : in out File_Type;
- Mode : in File_Mode;
- Name : in String;
- Form : in String := "")
+ Mode : File_Mode;
+ Name : String;
+ Form : String := "")
is
- File_Control_Block : Stream_AFCB;
+ Dummy_File_Control_Block : Stream_AFCB;
+ pragma Warnings (Off, Dummy_File_Control_Block);
+ -- Yes, we know this is never assigned a value, only the tag
+ -- is used for dispatching purposes, so that's expected.
begin
FIO.Open (File_Ptr => AP (File),
- Dummy_FCB => File_Control_Block,
+ Dummy_FCB => Dummy_File_Control_Block,
Mode => To_FCB (Mode),
Name => Name,
Form => Form,
Reset (File, Mode);
- File.Last_Op := Op_Read;
+ -- Set last operation. The purpose here is to ensure proper handling
+ -- of the initial operation. In general, a write after a read requires
+ -- resetting and doing a seek, so we set the last operation as Read
+ -- for an In_Out file, but for an Out file we set the last operation
+ -- to Op_Write, since in this case it is not necessary to do a seek
+ -- (and furthermore there are situations (such as the case of writing
+ -- a sequential Posix FIFO file) where the lseek would cause problems.
+
+ if Mode = Out_File then
+ File.Last_Op := Op_Write;
+ else
+ File.Last_Op := Op_Read;
+ end if;
end Open;
----------
----------
procedure Read
- (File : in File_Type;
+ (File : File_Type;
Item : out Stream_Element_Array;
Last : out Stream_Element_Offset;
- From : in Positive_Count)
+ From : Positive_Count)
is
begin
Set_Index (File, From);
end Read;
procedure Read
- (File : in File_Type;
+ (File : File_Type;
Item : out Stream_Element_Array;
Last : out Stream_Element_Offset)
is
-- Reset --
-----------
- procedure Reset (File : in out File_Type; Mode : in File_Mode) is
+ procedure Reset (File : in out File_Type; Mode : File_Mode) is
begin
FIO.Check_File_Open (AP (File));
-- Set_Index --
---------------
- procedure Set_Index (File : in File_Type; To : in Positive_Count) is
+ procedure Set_Index (File : File_Type; To : Positive_Count) is
begin
FIO.Check_File_Open (AP (File));
File.Index := Count (To);
-- Set_Mode --
--------------
- procedure Set_Mode (File : in out File_Type; Mode : in File_Mode) is
+ procedure Set_Mode (File : in out File_Type; Mode : File_Mode) is
begin
FIO.Check_File_Open (AP (File));
-- Set_Position --
------------------
- procedure Set_Position (File : in File_Type) is
+ procedure Set_Position (File : File_Type) is
+ use type System.CRTL.long;
begin
- if fseek (File.Stream, long (File.Index) - 1, SEEK_SET) /= 0 then
+ if fseek (File.Stream,
+ System.CRTL.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
+ function Size (File : File_Type) return Count is
begin
FIO.Check_File_Open (AP (File));
-- Stream --
------------
- function Stream (File : in File_Type) return Stream_Access is
+ function Stream (File : File_Type) return Stream_Access is
begin
FIO.Check_File_Open (AP (File));
return Stream_Access (File);
-----------
procedure Write
- (File : in File_Type;
- Item : in Stream_Element_Array;
- To : in Positive_Count)
+ (File : File_Type;
+ Item : Stream_Element_Array;
+ To : Positive_Count)
is
begin
Set_Index (File, To);
Write (File, Item);
end Write;
- procedure Write (File : in File_Type; Item : in Stream_Element_Array) is
+ procedure Write
+ (File : File_Type;
+ Item : Stream_Element_Array)
+ is
begin
FIO.Check_Write_Status (AP (File));
procedure Write
(File : in out Stream_AFCB;
- Item : in Ada.Streams.Stream_Element_Array)
+ Item : Ada.Streams.Stream_Element_Array)
is
begin
Write (File'Unchecked_Access, Item);
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