------------------------------------------------------------------------------
-- --
--- GNAT RUNTIME COMPONENTS --
+-- GNAT RUN-TIME COMPONENTS --
-- --
-- A D A . T E X T _ 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 Ada.Streams; use Ada.Streams;
with Interfaces.C_Streams; use Interfaces.C_Streams;
-with System;
+
with System.File_IO;
-with Unchecked_Conversion;
-with Unchecked_Deallocation;
+with System.CRTL;
+
+with Ada.Unchecked_Conversion;
+with Ada.Unchecked_Deallocation;
pragma Elaborate_All (System.File_IO);
-- Needed because of calls to Chain_File in package body elaboration
subtype AP is FCB.AFCB_Ptr;
- function To_FCB is new Unchecked_Conversion (File_Mode, FCB.File_Mode);
- function To_TIO is new Unchecked_Conversion (FCB.File_Mode, File_Mode);
+ function To_FCB is new Ada.Unchecked_Conversion (File_Mode, FCB.File_Mode);
+ function To_TIO is new Ada.Unchecked_Conversion (FCB.File_Mode, File_Mode);
use type FCB.File_Mode;
+ use type System.CRTL.size_t;
+
-------------------
-- AFCB_Allocate --
-------------------
function AFCB_Allocate (Control_Block : Text_AFCB) return FCB.AFCB_Ptr is
- pragma Warnings (Off, Control_Block);
-
+ pragma Unreferenced (Control_Block);
begin
return new Text_AFCB;
end AFCB_Allocate;
-- AFCB_Close --
----------------
- procedure AFCB_Close (File : access Text_AFCB) is
+ procedure AFCB_Close (File : not null access Text_AFCB) is
begin
-- If the file being closed is one of the current files, then close
-- the corresponding current file. It is not clear that this action
-- AFCB_Free --
---------------
- procedure AFCB_Free (File : access Text_AFCB) is
+ procedure AFCB_Free (File : not null access Text_AFCB) is
type FCB_Ptr is access all Text_AFCB;
FT : FCB_Ptr := FCB_Ptr (File);
- procedure Free is new Unchecked_Deallocation (Text_AFCB, FCB_Ptr);
+ procedure Free is new Ada.Unchecked_Deallocation (Text_AFCB, FCB_Ptr);
begin
Free (FT);
-- to exceed the value of Count'Last, i.e. no check is required for
-- overflow raising layout error.
- function Col (File : in File_Type) return Positive_Count is
+ function Col (File : File_Type) return Positive_Count is
begin
FIO.Check_File_Open (AP (File));
return File.Col;
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 : Text_AFCB;
+ Dummy_File_Control_Block : Text_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
- ch : int;
+ function End_Of_File (File : File_Type) return Boolean is
+ ch : int;
begin
FIO.Check_Read_Status (AP (File));
-- End_Of_Line --
-----------------
- function End_Of_Line (File : in File_Type) return Boolean is
+ function End_Of_Line (File : File_Type) return Boolean is
ch : int;
begin
-- End_Of_Page --
-----------------
- function End_Of_Page (File : in File_Type) return Boolean is
+ function End_Of_Page (File : File_Type) return Boolean is
ch : int;
begin
return End_Of_Page (Current_In);
end End_Of_Page;
+ --------------
+ -- EOF_Char --
+ --------------
+
+ function EOF_Char return Integer is
+ begin
+ return EOF;
+ end EOF_Char;
+
-----------
-- Flush --
-----------
- procedure Flush (File : in File_Type) is
+ procedure Flush (File : File_Type) is
begin
FIO.Flush (AP (File));
end Flush;
-- 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;
---------
procedure Get
- (File : in File_Type;
+ (File : File_Type;
Item : out Character)
is
ch : int;
end Get;
procedure Get
- (File : in File_Type;
+ (File : File_Type;
Item : out String)
is
ch : int;
-- More work required here ???
procedure Get_Immediate
- (File : in File_Type;
+ (File : File_Type;
Item : out Character)
is
ch : int;
end_of_file : int;
procedure getc_immediate
- (stream : FILEs; ch : out int; end_of_file : out int);
+ (stream : FILEs;
+ ch : out int;
+ end_of_file : out int);
pragma Import (C, getc_immediate, "getc_immediate");
begin
end if;
Item := Character'Val (ch);
-
end Get_Immediate;
procedure Get_Immediate
end Get_Immediate;
procedure Get_Immediate
- (File : in File_Type;
+ (File : File_Type;
Item : out Character;
Available : out Boolean)
is
--------------
procedure Get_Line
- (File : in File_Type;
+ (File : File_Type;
Item : out String;
Last : out Natural)
is
Get_Line (Current_In, Item, Last);
end Get_Line;
+ function Get_Line (File : File_Type) return String is
+ Buffer : String (1 .. 500);
+ Last : Natural;
+
+ function Get_Rest (S : String) return String;
+ -- This is a recursive function that reads the rest of the line and
+ -- returns it. S is the part read so far.
+
+ --------------
+ -- Get_Rest --
+ --------------
+
+ function Get_Rest (S : String) return String is
+
+ -- Each time we allocate a buffer the same size as what we have
+ -- read so far. This limits us to a logarithmic number of calls
+ -- to Get_Rest and also ensures only a linear use of stack space.
+
+ Buffer : String (1 .. S'Length);
+ Last : Natural;
+
+ begin
+ Get_Line (File, Buffer, Last);
+
+ declare
+ R : constant String := S & Buffer (1 .. Last);
+ begin
+ if Last < Buffer'Last then
+ return R;
+ else
+ return Get_Rest (R);
+ end if;
+ end;
+ end Get_Rest;
+
+ -- Start of processing for Get_Line
+
+ begin
+ Get_Line (File, Buffer, Last);
+
+ if Last < Buffer'Last then
+ return Buffer (1 .. Last);
+ else
+ return Get_Rest (Buffer (1 .. Last));
+ end if;
+ end Get_Line;
+
+ function Get_Line return String is
+ begin
+ return Get_Line (Current_In);
+ end Get_Line;
+
----------
-- Getc --
----------
-- 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;
-- to exceed the value of Count'Last, i.e. no check is required for
-- overflow raising layout error.
- function Line (File : in File_Type) return Positive_Count is
+ function Line (File : File_Type) return Positive_Count is
begin
FIO.Check_File_Open (AP (File));
return File.Line;
-- Line_Length --
-----------------
- function Line_Length (File : in File_Type) return Count is
+ function Line_Length (File : File_Type) return Count is
begin
FIO.Check_Write_Status (AP (File));
return File.Line_Length;
----------------
procedure Look_Ahead
- (File : in File_Type;
+ (File : File_Type;
Item : out Character;
End_Of_Line : out Boolean)
is
-- Mode --
----------
- function Mode (File : in File_Type) return File_Mode is
+ function Mode (File : File_Type) return File_Mode is
begin
return To_TIO (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 New_Line
- (File : in File_Type;
- Spacing : in Positive_Count := 1)
+ (File : File_Type;
+ Spacing : Positive_Count := 1)
is
begin
-- Raise Constraint_Error if out of range value. The reason for this
-- explicit test is that we don't want junk values around, even if
-- checks are off in the caller.
- if Spacing not in Positive_Count then
+ if not Spacing'Valid then
raise Constraint_Error;
end if;
File.Col := 1;
end New_Line;
- procedure New_Line (Spacing : in Positive_Count := 1) is
+ procedure New_Line (Spacing : Positive_Count := 1) is
begin
New_Line (Current_Out, Spacing);
end New_Line;
-- New_Page --
--------------
- procedure New_Page (File : in File_Type) is
+ procedure New_Page (File : File_Type) is
begin
FIO.Check_Write_Status (AP (File));
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 : Text_AFCB;
+ Dummy_File_Control_Block : Text_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,
-- to exceed the value of Count'Last, i.e. no check is required for
-- overflow raising layout error.
- function Page (File : in File_Type) return Positive_Count is
+ function Page (File : File_Type) return Positive_Count is
begin
FIO.Check_File_Open (AP (File));
return File.Page;
-- Page_Length --
-----------------
- function Page_Length (File : in File_Type) return Count is
+ function Page_Length (File : File_Type) return Count is
begin
FIO.Check_Write_Status (AP (File));
return File.Page_Length;
---------
procedure Put
- (File : in File_Type;
- Item : in Character)
+ (File : File_Type;
+ Item : Character)
is
begin
FIO.Check_Write_Status (AP (File));
File.Col := File.Col + 1;
end Put;
- procedure Put (Item : in Character) is
+ procedure Put (Item : Character) is
begin
FIO.Check_Write_Status (AP (Current_Out));
---------
procedure Put
- (File : in File_Type;
- Item : in String)
+ (File : File_Type;
+ Item : String)
is
begin
FIO.Check_Write_Status (AP (File));
end if;
end Put;
- procedure Put (Item : in String) is
+ procedure Put (Item : String) is
begin
Put (Current_Out, Item);
end Put;
--------------
procedure Put_Line
- (File : in File_Type;
- Item : in String)
+ (File : File_Type;
+ Item : String)
is
+ Ilen : Natural := Item'Length;
+ Istart : Natural := Item'First;
+
begin
FIO.Check_Write_Status (AP (File));
-- tasking programs, since often the OS will treat the entire put
-- operation as an atomic operation.
+ -- We only do this if the message is 512 characters or less in length,
+ -- since otherwise Put_Line would use an unbounded amount of stack
+ -- space and could cause undetected stack overflow. If we have a
+ -- longer string, then output the first part separately to avoid this.
+
+ if Ilen > 512 then
+ FIO.Write_Buf (AP (File), Item'Address, size_t (Ilen - 512));
+ Istart := Istart + Ilen - 512;
+ Ilen := 512;
+ end if;
+
+ -- Now prepare the string with its terminator
+
declare
- Ilen : constant Natural := Item'Length;
Buffer : String (1 .. Ilen + 2);
Plen : size_t;
begin
- Buffer (1 .. Ilen) := Item;
+ Buffer (1 .. Ilen) := Item (Istart .. Item'Last);
Buffer (Ilen + 1) := Character'Val (LM);
if File.Page_Length /= 0
end;
end Put_Line;
- procedure Put_Line (Item : in String) is
+ procedure Put_Line (Item : String) is
begin
Put_Line (Current_Out, Item);
end Put_Line;
Item : out Stream_Element_Array;
Last : out Stream_Element_Offset)
is
- ch : int;
+ Discard_ch : int;
+ pragma Warnings (Off, Discard_ch);
begin
if File.Mode /= FCB.In_File then
-- be expected if stream and text input are mixed this way?
if File.Before_LM_PM then
- ch := ungetc (PM, File.Stream);
+ Discard_ch := ungetc (PM, File.Stream);
File.Before_LM_PM := False;
end if;
procedure Reset
(File : in out File_Type;
- Mode : in File_Mode)
+ Mode : File_Mode)
is
begin
-- Don't allow change of mode for current file (RM A.10.2(5))
-------------
procedure Set_Col
- (File : in File_Type;
- To : in Positive_Count)
+ (File : File_Type;
+ To : Positive_Count)
is
ch : int;
-- explicit test is that we don't want junk values around, even if
-- checks are off in the caller.
- if To not in Positive_Count then
+ if not To'Valid then
raise Constraint_Error;
end if;
FIO.Check_File_Open (AP (File));
- if To = File.Col then
- return;
- end if;
+ -- Output case
if Mode (File) >= Out_File then
+
+ -- Error if we attempt to set Col to a value greater than the
+ -- maximum permissible line length.
+
if File.Line_Length /= 0 and then To > File.Line_Length then
raise Layout_Error;
end if;
+ -- If we are behind current position, then go to start of new line
+
if To < File.Col then
New_Line (File);
end if;
+ -- Loop to output blanks till we are at the required column
+
while File.Col < To loop
Put (File, ' ');
end loop;
+ -- Input case
+
else
+ -- If we are logically before a LM, but physically after it, the
+ -- file position still reflects the position before the LM, so eat
+ -- it now and adjust the file position appropriately.
+
+ if File.Before_LM then
+ File.Before_LM := False;
+ File.Before_LM_PM := False;
+ File.Line := File.Line + 1;
+ File.Col := 1;
+ end if;
+
+ -- Loop reading characters till we get one at the required Col value
+
loop
+ -- Read next character. The reason we have to read ahead is to
+ -- skip formatting characters, the effect of Set_Col is to set
+ -- us to a real character with the right Col value, and format
+ -- characters don't count.
+
ch := Getc (File);
+ -- Error if we hit an end of file
+
if ch = EOF then
raise End_Error;
+ -- If line mark, eat it and adjust file position
+
elsif ch = LM then
File.Line := File.Line + 1;
File.Col := 1;
+ -- If recognized page mark, eat it, and adjust file position
+
elsif ch = PM and then File.Is_Regular_File then
File.Page := File.Page + 1;
File.Line := 1;
File.Col := 1;
+ -- Otherwise this is the character we are looking for, so put it
+ -- back in the input stream (we have not adjusted the file
+ -- position yet, so everything is set right after this ungetc).
+
elsif To = File.Col then
Ungetc (ch, File);
return;
+ -- Keep skipping characters if we are not there yet, updating the
+ -- file position past the skipped character.
+
else
File.Col := File.Col + 1;
end if;
end if;
end Set_Col;
- procedure Set_Col (To : in Positive_Count) is
+ procedure Set_Col (To : Positive_Count) is
begin
Set_Col (Current_Out, To);
end Set_Col;
-- Set_Error --
---------------
- procedure Set_Error (File : in File_Type) is
+ procedure Set_Error (File : File_Type) is
begin
FIO.Check_Write_Status (AP (File));
Current_Err := File;
-- Set_Input --
---------------
- procedure Set_Input (File : in File_Type) is
+ procedure Set_Input (File : File_Type) is
begin
FIO.Check_Read_Status (AP (File));
Current_In := File;
--------------
procedure Set_Line
- (File : in File_Type;
- To : in Positive_Count)
+ (File : File_Type;
+ To : Positive_Count)
is
begin
-- Raise Constraint_Error if out of range value. The reason for this
-- explicit test is that we don't want junk values around, even if
-- checks are off in the caller.
- if To not in Positive_Count then
+ if not To'Valid then
raise Constraint_Error;
end if;
end if;
end Set_Line;
- procedure Set_Line (To : in Positive_Count) is
+ procedure Set_Line (To : Positive_Count) is
begin
Set_Line (Current_Out, To);
end Set_Line;
-- Set_Line_Length --
---------------------
- procedure Set_Line_Length (File : in File_Type; To : in Count) is
+ procedure Set_Line_Length (File : File_Type; To : Count) is
begin
-- Raise Constraint_Error if out of range value. The reason for this
-- explicit test is that we don't want junk values around, even if
-- checks are off in the caller.
- if To not in Count then
+ if not To'Valid then
raise Constraint_Error;
end if;
File.Line_Length := To;
end Set_Line_Length;
- procedure Set_Line_Length (To : in Count) is
+ procedure Set_Line_Length (To : Count) is
begin
Set_Line_Length (Current_Out, To);
end Set_Line_Length;
-- Set_Output --
----------------
- procedure Set_Output (File : in File_Type) is
+ procedure Set_Output (File : File_Type) is
begin
FIO.Check_Write_Status (AP (File));
Current_Out := File;
-- Set_Page_Length --
---------------------
- procedure Set_Page_Length (File : in File_Type; To : in Count) is
+ procedure Set_Page_Length (File : File_Type; To : Count) is
begin
-- Raise Constraint_Error if out of range value. The reason for this
-- explicit test is that we don't want junk values around, even if
-- checks are off in the caller.
- if To not in Count then
+ if not To'Valid then
raise Constraint_Error;
end if;
File.Page_Length := To;
end Set_Page_Length;
- procedure Set_Page_Length (To : in Count) is
+ procedure Set_Page_Length (To : Count) is
begin
Set_Page_Length (Current_Out, To);
end Set_Page_Length;
---------------
procedure Skip_Line
- (File : in File_Type;
- Spacing : in Positive_Count := 1)
+ (File : File_Type;
+ Spacing : Positive_Count := 1)
is
ch : int;
-- explicit test is that we don't want junk values around, even if
-- checks are off in the caller.
- if Spacing not in Positive_Count then
+ if not Spacing'Valid then
raise Constraint_Error;
end if;
for L in 1 .. Spacing loop
if File.Before_LM then
File.Before_LM := False;
- File.Before_LM_PM := False;
+
+ -- Note that if File.Before_LM_PM is currently set, we also have
+ -- to reset it (because it makes sense for Before_LM_PM to be set
+ -- only when Before_LM is also set). This is done later on in this
+ -- subprogram, as soon as Before_LM_PM has been taken into account
+ -- for the purpose of page and line counts.
else
ch := Getc (File);
end loop;
end Skip_Line;
- procedure Skip_Line (Spacing : in Positive_Count := 1) is
+ procedure Skip_Line (Spacing : Positive_Count := 1) is
begin
Skip_Line (Current_In, Spacing);
end Skip_Line;
-- Skip_Page --
---------------
- procedure Skip_Page (File : in File_Type) is
+ procedure Skip_Page (File : File_Type) is
ch : int;
begin
-- because it is too much of a nuisance to have these odd line
-- feeds when nothing has been written to the file.
+ -- We also avoid this for files opened in append mode, in
+ -- accordance with (RM A.8.2(10))
+
elsif (File /= Standard_Err and then File /= Standard_Out)
and then (File.Line = 1 and then File.Page = 1)
+ and then Mode (File) = Out_File
then
New_Line (File);
end if;
procedure Write
(File : in out Text_AFCB;
- Item : in Stream_Element_Array)
+ Item : Stream_Element_Array)
is
+ pragma Warnings (Off, File);
+ -- Because in this implementation we don't need IN OUT, we only read
function Has_Translated_Characters return Boolean;
-- return True if Item array contains a character which will be
-- character under DOS based systems which is character 10.
text_translation_required : Boolean;
+ for text_translation_required'Size use Character'Size;
pragma Import (C, text_translation_required,
"__gnat_text_translation_required");
Siz : constant size_t := Item'Length;
+ -------------------------------
+ -- Has_Translated_Characters --
+ -------------------------------
+
function Has_Translated_Characters return Boolean is
begin
for K in Item'Range loop
end Has_Translated_Characters;
Needs_Binary_Write : constant Boolean :=
- text_translation_required and then Has_Translated_Characters;
+ text_translation_required
+ and then Has_Translated_Characters;
+
+ -- Start of processing for Write
begin
if File.Mode = FCB.In_File then
-- with text mode if needed.
if Needs_Binary_Write then
-
if fflush (File.Stream) = -1 then
raise Device_Error;
end if;
-- we reset to text mode.
if Needs_Binary_Write then
-
if fflush (File.Stream) = -1 then
raise Device_Error;
end if;
Err_Name : aliased String := "*stderr" & ASCII.Nul;
In_Name : aliased String := "*stdin" & ASCII.Nul;
Out_Name : aliased String := "*stdout" & ASCII.Nul;
+
begin
-------------------------------
-- Initialize Standard Files --
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