with Interfaces.C_Streams; use Interfaces.C_Streams;
with System; use System;
with System.File_IO;
with System.Soft_Links;
with System.CRTL;
with Unchecked_Conversion;
with Unchecked_Deallocation;
package body Ada.Streams.Stream_IO is
package FIO renames System.File_IO;
package SSL renames System.Soft_Links;
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);
use type FCB.File_Mode;
use type FCB.Shared_Status_Type;
procedure Set_Position (File : in File_Type);
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;
procedure AFCB_Close (File : access Stream_AFCB) is
pragma Warnings (Off, File);
begin
null;
end AFCB_Close;
procedure AFCB_Free (File : 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);
begin
Free (FT);
end AFCB_Free;
procedure Close (File : in out File_Type) is
begin
FIO.Close (AP (File));
end Close;
procedure Create
(File : in out File_Type;
Mode : in File_Mode := Out_File;
Name : in String := "";
Form : in String := "")
is
Dummy_File_Control_Block : Stream_AFCB;
pragma Warnings (Off, Dummy_File_Control_Block);
begin
FIO.Open (File_Ptr => AP (File),
Dummy_FCB => Dummy_File_Control_Block,
Mode => To_FCB (Mode),
Name => Name,
Form => Form,
Amethod => 'S',
Creat => True,
Text => False);
File.Last_Op := Op_Write;
end Create;
procedure Delete (File : in out File_Type) is
begin
FIO.Delete (AP (File));
end Delete;
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;
procedure Flush (File : File_Type) is
begin
FIO.Flush (AP (File));
end Flush;
function Form (File : in File_Type) return String is
begin
return FIO.Form (AP (File));
end Form;
function Index (File : in File_Type) return Positive_Count is
begin
FIO.Check_File_Open (AP (File));
return Count (File.Index);
end Index;
function Is_Open (File : in File_Type) return Boolean is
begin
return FIO.Is_Open (AP (File));
end Is_Open;
function Mode (File : in File_Type) return File_Mode is
begin
return To_SIO (FIO.Mode (AP (File)));
end Mode;
function Name (File : in 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 := "")
is
Dummy_File_Control_Block : Stream_AFCB;
pragma Warnings (Off, Dummy_File_Control_Block);
begin
FIO.Open (File_Ptr => AP (File),
Dummy_FCB => Dummy_File_Control_Block,
Mode => To_FCB (Mode),
Name => Name,
Form => Form,
Amethod => 'S',
Creat => False,
Text => False);
Reset (File, Mode);
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;
Item : out Stream_Element_Array;
Last : out Stream_Element_Offset;
From : in Positive_Count)
is
begin
Set_Index (File, From);
Read (File, Item, Last);
end Read;
procedure Read
(File : in File_Type;
Item : out Stream_Element_Array;
Last : out Stream_Element_Offset)
is
Nread : size_t;
begin
FIO.Check_Read_Status (AP (File));
if File.Last_Op /= Op_Read
or else File.Shared_Status = FCB.Yes
then
Locked_Processing : begin
SSL.Lock_Task.all;
Set_Position (File);
FIO.Read_Buf (AP (File), Item'Address, Item'Length, Nread);
SSL.Unlock_Task.all;
exception
when others =>
SSL.Unlock_Task.all;
raise;
end Locked_Processing;
else
FIO.Read_Buf (AP (File), Item'Address, Item'Length, Nread);
end if;
File.Index := File.Index + Count (Nread);
Last := Item'First + Stream_Element_Offset (Nread) - 1;
File.Last_Op := Op_Read;
end Read;
procedure Read
(File : in out Stream_AFCB;
Item : out Ada.Streams.Stream_Element_Array;
Last : out Ada.Streams.Stream_Element_Offset)
is
begin
Read (File'Unchecked_Access, Item, Last);
end Read;
procedure Reset (File : in out File_Type; Mode : in File_Mode) is
begin
FIO.Check_File_Open (AP (File));
File.Index := 1;
Set_Mode (File, Mode);
end Reset;
procedure Reset (File : in out File_Type) is
begin
Reset (File, To_SIO (File.Mode));
end Reset;
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;
procedure Set_Mode (File : in out File_Type; Mode : in File_Mode) is
begin
FIO.Check_File_Open (AP (File));
if ((File.Mode = FCB.In_File) /= (Mode = In_File))
and then not File.Update_Mode
then
FIO.Reset (AP (File), FCB.Inout_File);
File.Update_Mode := True;
end if;
File.Mode := To_FCB (Mode);
FIO.Append_Set (AP (File));
if File.Mode = FCB.Append_File then
File.Index := Count (ftell (File.Stream)) + 1;
end if;
File.Last_Op := Op_Other;
end Set_Mode;
procedure Set_Position (File : in File_Type) is
use type System.CRTL.long;
begin
if fseek (File.Stream,
System.CRTL.long (File.Index) - 1, SEEK_SET) /= 0
then
raise Use_Error;
end if;
end Set_Position;
function Size (File : in File_Type) return Count is
begin
FIO.Check_File_Open (AP (File));
if File.File_Size = -1 then
File.Last_Op := Op_Other;
if fseek (File.Stream, 0, SEEK_END) /= 0 then
raise Device_Error;
end if;
File.File_Size := Stream_Element_Offset (ftell (File.Stream));
end if;
return Count (File.File_Size);
end Size;
function Stream (File : in File_Type) return Stream_Access is
begin
FIO.Check_File_Open (AP (File));
return Stream_Access (File);
end Stream;
procedure Write
(File : in File_Type;
Item : in Stream_Element_Array;
To : in 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
begin
FIO.Check_Write_Status (AP (File));
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;
procedure Write
(File : in out Stream_AFCB;
Item : in Ada.Streams.Stream_Element_Array)
is
begin
Write (File'Unchecked_Access, Item);
end Write;
end Ada.Streams.Stream_IO;