------------------------------------------------------------------------------
-- --
--- GNAT RUNTIME COMPONENTS --
+-- GNAT RUN-TIME COMPONENTS --
-- --
-- A D A . T E X T _ I O --
-- --
-- B o d y --
-- --
--- Copyright (C) 1992-2004 Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2010, 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- --
+-- ware Foundation; either version 3, 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. --
+-- or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
--- 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. --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception, --
+-- version 3.1, as published by the Free Software Foundation. --
+-- --
+-- You should have received a copy of the GNU General Public License and --
+-- a copy of the GCC Runtime Library Exception along with this program; --
+-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
+-- <http://www.gnu.org/licenses/>. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
-with Ada.Streams; use Ada.Streams;
-with Interfaces.C_Streams; use Interfaces.C_Streams;
-with System;
+with Ada.Streams; use Ada.Streams;
+with Interfaces.C_Streams; use Interfaces.C_Streams;
+
with System.File_IO;
with System.CRTL;
-with Unchecked_Conversion;
-with Unchecked_Deallocation;
+with System.WCh_Cnv; use System.WCh_Cnv;
+with System.WCh_Con; use System.WCh_Con;
+
+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;
+ WC_Encoding : Character;
+ pragma Import (C, WC_Encoding, "__gl_wc_encoding");
+ -- Default wide character encoding
+
+ Err_Name : aliased String := "*stderr" & ASCII.NUL;
+ In_Name : aliased String := "*stdin" & ASCII.NUL;
+ Out_Name : aliased String := "*stdout" & ASCII.NUL;
+ -- Names of standard files
+ --
+ -- Use "preallocated" strings to avoid calling "new" during the elaboration
+ -- of the run time. This is needed in the tasking case to avoid calling
+ -- Task_Lock too early. A filename is expected to end with a null character
+ -- in the runtime, here the null characters are added just to have a
+ -- correct filename length.
+ --
+ -- Note: the names for these files are bogus, and probably it would be
+ -- better for these files to have no names, but the ACVC tests insist!
+ -- We use names that are bound to fail in open etc.
+
+ Null_Str : aliased constant String := "";
+ -- Used as form string for standard files
+
+ -----------------------
+ -- Local Subprograms --
+ -----------------------
+
+ function Get_Upper_Half_Char
+ (C : Character;
+ File : File_Type) return Character;
+ -- This function is shared by Get and Get_Immediate to extract an encoded
+ -- upper half character value from the given File. The first byte has
+ -- already been read and is passed in C. The character value is returned as
+ -- the result, and the file pointer is bumped past the character.
+ -- Constraint_Error is raised if the encoded value is outside the bounds of
+ -- type Character.
+
+ function Get_Upper_Half_Char_Immed
+ (C : Character;
+ File : File_Type) return Character;
+ -- This routine is identical to Get_Upper_Half_Char, except that the reads
+ -- are done in Get_Immediate mode (i.e. without waiting for a line return).
+
+ function Getc (File : File_Type) return int;
+ -- Gets next character from file, which has already been checked for being
+ -- in read status, and returns the character read if no error occurs. The
+ -- result is EOF if the end of file was read.
+
+ function Getc_Immed (File : File_Type) return int;
+ -- This routine is identical to Getc, except that the read is done in
+ -- Get_Immediate mode (i.e. without waiting for a line return).
+
+ function Has_Upper_Half_Character (Item : String) return Boolean;
+ -- Returns True if any of the characters is in the range 16#80#-16#FF#
+
+ function Nextc (File : File_Type) return int;
+ -- Returns next character from file without skipping past it (i.e. it is a
+ -- combination of Getc followed by an Ungetc).
+
+ procedure Put_Encoded (File : File_Type; Char : Character);
+ -- Called to output a character Char to the given File, when the encoding
+ -- method for the file is other than brackets, and Char is upper half.
+
+ procedure Putc (ch : int; File : File_Type);
+ -- Outputs the given character to the file, which has already been checked
+ -- for being in output status. Device_Error is raised if the character
+ -- cannot be written.
+
+ procedure Set_WCEM (File : in out File_Type);
+ -- Called by Open and Create to set the wide character encoding method for
+ -- the file, processing a WCEM form parameter if one is present. File is
+ -- IN OUT because it may be closed in case of an error.
+
+ procedure Terminate_Line (File : File_Type);
+ -- If the file is in Write_File or Append_File mode, and the current line
+ -- is not terminated, then a line terminator is written using New_Line.
+ -- Note that there is no Terminate_Page routine, because the page mark at
+ -- the end of the file is implied if necessary.
+
+ procedure Ungetc (ch : int; File : File_Type);
+ -- Pushes back character into stream, using ungetc. The caller has checked
+ -- that the file is in read status. Device_Error is raised if the character
+ -- cannot be pushed back. An attempt to push back and end of file character
+ -- (EOF) is ignored.
+
-------------------
-- AFCB_Allocate --
-------------------
function AFCB_Allocate (Control_Block : Text_AFCB) return FCB.AFCB_Ptr is
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);
procedure Close (File : in out File_Type) is
begin
- FIO.Close (AP (File));
+ FIO.Close (AP (File)'Unrestricted_Access);
end Close;
---------
-- 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
Dummy_File_Control_Block : Text_AFCB;
pragma Warnings (Off, Dummy_File_Control_Block);
Text => True);
File.Self := File;
+ Set_WCEM (File);
end Create;
-------------------
procedure Delete (File : in out File_Type) is
begin
- FIO.Delete (AP (File));
+ FIO.Delete (AP (File)'Unrestricted_Access);
end Delete;
-----------------
-- 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));
- if File.Before_LM then
+ if File.Before_Upper_Half_Character then
+ return False;
+ elsif File.Before_LM then
if File.Before_LM_PM then
return Nextc (File) = EOF;
end if;
-- 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
FIO.Check_Read_Status (AP (File));
- if File.Before_LM then
+ if File.Before_Upper_Half_Character then
+ return False;
+
+ elsif File.Before_LM then
return True;
else
-- 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
if not File.Is_Regular_File then
return False;
+ elsif File.Before_Upper_Half_Character then
+ return False;
+
elsif File.Before_LM then
if File.Before_LM_PM then
return True;
-- 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;
begin
FIO.Check_Read_Status (AP (File));
- if File.Before_LM then
+ if File.Before_Upper_Half_Character then
+ File.Before_Upper_Half_Character := False;
+ Item := File.Saved_Upper_Half_Character;
+
+ elsif File.Before_LM then
File.Before_LM := False;
File.Col := 1;
end Get;
procedure Get
- (File : in File_Type;
+ (File : File_Type;
Item : out String)
is
ch : int;
-- Get_Immediate --
-------------------
- -- 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);
- pragma Import (C, getc_immediate, "getc_immediate");
begin
FIO.Check_Read_Status (AP (File));
- if File.Before_LM then
+ if File.Before_Upper_Half_Character then
+ File.Before_Upper_Half_Character := False;
+ Item := File.Saved_Upper_Half_Character;
+
+ elsif File.Before_LM then
File.Before_LM := False;
File.Before_LM_PM := False;
- ch := LM;
+ Item := Character'Val (LM);
else
- getc_immediate (File.Stream, ch, end_of_file);
+ ch := Getc_Immed (File);
- if ferror (File.Stream) /= 0 then
- raise Device_Error;
- elsif end_of_file /= 0 then
+ if ch = EOF then
raise End_Error;
+ else
+ Item :=
+ (if not Is_Start_Of_Encoding (Character'Val (ch), File.WC_Method)
+ then Character'Val (ch)
+ else Get_Upper_Half_Char_Immed (Character'Val (ch), File));
end if;
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
begin
FIO.Check_Read_Status (AP (File));
+ Available := True;
- -- If we are logically before an end of line, but physically after it,
- -- then we just return the end of line character, no I/O is necessary.
+ if File.Before_Upper_Half_Character then
+ File.Before_Upper_Half_Character := False;
+ Item := File.Saved_Upper_Half_Character;
- if File.Before_LM then
+ elsif File.Before_LM then
File.Before_LM := False;
File.Before_LM_PM := False;
-
- Available := True;
Item := Character'Val (LM);
- -- Normal case where a read operation is required
-
else
getc_immediate_nowait (File.Stream, ch, end_of_file, avail);
else
Available := True;
- Item := Character'Val (ch);
+
+ Item :=
+ (if Is_Start_Of_Encoding (Character'Val (ch), File.WC_Method)
+ then Character'Val (ch)
+ else Get_Upper_Half_Char_Immed (Character'Val (ch), File));
end if;
end if;
--------------
procedure Get_Line
- (File : in File_Type;
+ (File : File_Type;
Item : out String;
+ Last : out Natural) is separate;
+ -- The implementation of Ada.Text_IO.Get_Line is split into a subunit so
+ -- that different implementations can be used on different systems. In
+ -- particular the standard implementation uses low level stuff that is
+ -- not appropriate for the JVM and .NET implementations.
+
+ procedure Get_Line
+ (Item : out String;
Last : out Natural)
is
- ch : int;
-
begin
- FIO.Check_Read_Status (AP (File));
- Last := Item'First - 1;
+ Get_Line (Current_In, Item, Last);
+ end Get_Line;
- -- Immediate exit for null string, this is a case in which we do not
- -- need to test for end of file and we do not skip a line mark under
- -- any circumstances.
+ function Get_Line (File : File_Type) return String is
+ Buffer : String (1 .. 500);
+ Last : Natural;
- if Last >= Item'Last then
- return;
- end if;
+ 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.
- -- Here we have at least one character, if we are immediately before
- -- a line mark, then we will just skip past it storing no characters.
+ --------------
+ -- Get_Rest --
+ --------------
- if File.Before_LM then
- File.Before_LM := False;
- File.Before_LM_PM := False;
+ 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.
- -- Otherwise we need to read some characters
+ 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
- ch := Getc (File);
+ 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;
+
+ -------------------------
+ -- Get_Upper_Half_Char --
+ -------------------------
+
+ function Get_Upper_Half_Char
+ (C : Character;
+ File : File_Type) return Character
+ is
+ Result : Wide_Character;
+
+ function In_Char return Character;
+ -- Function used to obtain additional characters it the wide character
+ -- sequence is more than one character long.
- -- If we are at the end of file now, it means we are trying to
- -- skip a file terminator and we raise End_Error (RM A.10.7(20))
+ function WC_In is new Char_Sequence_To_Wide_Char (In_Char);
+ -------------
+ -- In_Char --
+ -------------
+
+ function In_Char return Character is
+ ch : constant Integer := Getc (File);
+ begin
if ch = EOF then
raise End_Error;
+ else
+ return Character'Val (ch);
end if;
+ end In_Char;
- -- Loop through characters. Don't bother if we hit a page mark,
- -- since in normal files, page marks can only follow line marks
- -- in any case and we only promise to treat the page nonsense
- -- correctly in the absense of such rogue page marks.
-
- loop
- -- Exit the loop if read is terminated by encountering line mark
-
- exit when ch = LM;
-
- -- Otherwise store the character, note that we know that ch is
- -- something other than LM or EOF. It could possibly be a page
- -- mark if there is a stray page mark in the middle of a line,
- -- but this is not an official page mark in any case, since
- -- official page marks can only follow a line mark. The whole
- -- page business is pretty much nonsense anyway, so we do not
- -- want to waste time trying to make sense out of non-standard
- -- page marks in the file! This means that the behavior of
- -- Get_Line is different from repeated Get of a character, but
- -- that's too bad. We only promise that page numbers etc make
- -- sense if the file is formatted in a standard manner.
-
- -- Note: we do not adjust the column number because it is quicker
- -- to adjust it once at the end of the operation than incrementing
- -- it each time around the loop.
-
- Last := Last + 1;
- Item (Last) := Character'Val (ch);
-
- -- All done if the string is full, this is the case in which
- -- we do not skip the following line mark. We need to adjust
- -- the column number in this case.
-
- if Last = Item'Last then
- File.Col := File.Col + Count (Item'Length);
- return;
- end if;
+ -- Start of processing for Get_Upper_Half_Char
- -- Otherwise read next character. We also exit from the loop if
- -- we read an end of file. This is the case where the last line
- -- is not terminated with a line mark, and we consider that there
- -- is an implied line mark in this case (this is a non-standard
- -- file, but it is nice to treat it reasonably).
+ begin
+ Result := WC_In (C, File.WC_Method);
- ch := Getc (File);
- exit when ch = EOF;
- end loop;
+ if Wide_Character'Pos (Result) > 16#FF# then
+ raise Constraint_Error with
+ "invalid wide character in Text_'I'O input";
+ else
+ return Character'Val (Wide_Character'Pos (Result));
end if;
+ end Get_Upper_Half_Char;
- -- We have skipped past, but not stored, a line mark. Skip following
- -- page mark if one follows, but do not do this for a non-regular
- -- file (since otherwise we get annoying wait for an extra character)
+ -------------------------------
+ -- Get_Upper_Half_Char_Immed --
+ -------------------------------
- File.Line := File.Line + 1;
- File.Col := 1;
+ function Get_Upper_Half_Char_Immed
+ (C : Character;
+ File : File_Type) return Character
+ is
+ Result : Wide_Character;
- if File.Before_LM_PM then
- File.Line := 1;
- File.Before_LM_PM := False;
- File.Page := File.Page + 1;
+ function In_Char return Character;
+ -- Function used to obtain additional characters it the wide character
+ -- sequence is more than one character long.
- elsif File.Is_Regular_File then
- ch := Getc (File);
+ function WC_In is new Char_Sequence_To_Wide_Char (In_Char);
- if ch = PM and then File.Is_Regular_File then
- File.Line := 1;
- File.Page := File.Page + 1;
+ -------------
+ -- In_Char --
+ -------------
+
+ function In_Char return Character is
+ ch : constant Integer := Getc_Immed (File);
+ begin
+ if ch = EOF then
+ raise End_Error;
else
- Ungetc (ch, File);
+ return Character'Val (ch);
end if;
- end if;
- end Get_Line;
+ end In_Char;
+
+ -- Start of processing for Get_Upper_Half_Char_Immed
- procedure Get_Line
- (Item : out String;
- Last : out Natural)
- is
begin
- Get_Line (Current_In, Item, Last);
- end Get_Line;
+ Result := WC_In (C, File.WC_Method);
+
+ if Wide_Character'Pos (Result) > 16#FF# then
+ raise Constraint_Error with
+ "invalid wide character in Text_'I'O input";
+ else
+ return Character'Val (Wide_Character'Pos (Result));
+ end if;
+ end Get_Upper_Half_Char_Immed;
----------
-- Getc --
end if;
end Getc;
+ ----------------
+ -- Getc_Immed --
+ ----------------
+
+ function Getc_Immed (File : File_Type) return int is
+ ch : int;
+ end_of_file : int;
+
+ procedure getc_immediate
+ (stream : FILEs; ch : out int; end_of_file : out int);
+ pragma Import (C, getc_immediate, "getc_immediate");
+
+ begin
+ FIO.Check_Read_Status (AP (File));
+
+ if File.Before_LM then
+ File.Before_LM := False;
+ File.Before_LM_PM := False;
+ ch := LM;
+
+ else
+ getc_immediate (File.Stream, ch, end_of_file);
+
+ if ferror (File.Stream) /= 0 then
+ raise Device_Error;
+ elsif end_of_file /= 0 then
+ return EOF;
+ end if;
+ end if;
+
+ return ch;
+ end Getc_Immed;
+
+ ------------------------------
+ -- Has_Upper_Half_Character --
+ ------------------------------
+
+ function Has_Upper_Half_Character (Item : String) return Boolean is
+ begin
+ for J in Item'Range loop
+ if Character'Pos (Item (J)) >= 16#80# then
+ return True;
+ end if;
+ end loop;
+
+ return False;
+ end Has_Upper_Half_Character;
+
+ -------------------------------
+ -- Initialize_Standard_Files --
+ -------------------------------
+
+ procedure Initialize_Standard_Files is
+ begin
+ Standard_Err.Stream := stderr;
+ Standard_Err.Name := Err_Name'Access;
+ Standard_Err.Form := Null_Str'Unrestricted_Access;
+ Standard_Err.Mode := FCB.Out_File;
+ Standard_Err.Is_Regular_File := is_regular_file (fileno (stderr)) /= 0;
+ Standard_Err.Is_Temporary_File := False;
+ Standard_Err.Is_System_File := True;
+ Standard_Err.Is_Text_File := True;
+ Standard_Err.Access_Method := 'T';
+ Standard_Err.Self := Standard_Err;
+ Standard_Err.WC_Method := Default_WCEM;
+
+ Standard_In.Stream := stdin;
+ Standard_In.Name := In_Name'Access;
+ Standard_In.Form := Null_Str'Unrestricted_Access;
+ Standard_In.Mode := FCB.In_File;
+ Standard_In.Is_Regular_File := is_regular_file (fileno (stdin)) /= 0;
+ Standard_In.Is_Temporary_File := False;
+ Standard_In.Is_System_File := True;
+ Standard_In.Is_Text_File := True;
+ Standard_In.Access_Method := 'T';
+ Standard_In.Self := Standard_In;
+ Standard_In.WC_Method := Default_WCEM;
+
+ Standard_Out.Stream := stdout;
+ Standard_Out.Name := Out_Name'Access;
+ Standard_Out.Form := Null_Str'Unrestricted_Access;
+ Standard_Out.Mode := FCB.Out_File;
+ Standard_Out.Is_Regular_File := is_regular_file (fileno (stdout)) /= 0;
+ Standard_Out.Is_Temporary_File := False;
+ Standard_Out.Is_System_File := True;
+ Standard_Out.Is_Text_File := True;
+ Standard_Out.Access_Method := 'T';
+ Standard_Out.Self := Standard_Out;
+ Standard_Out.WC_Method := Default_WCEM;
+
+ FIO.Make_Unbuffered (AP (Standard_Out));
+ FIO.Make_Unbuffered (AP (Standard_Err));
+ end Initialize_Standard_Files;
+
-------------
-- 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
begin
FIO.Check_Read_Status (AP (File));
+ -- If we are logically before a line mark, we can return immediately
+
if File.Before_LM then
End_Of_Line := True;
Item := ASCII.NUL;
+ -- If we are before an upper half character just return it (this can
+ -- happen if there are two calls to Look_Ahead in a row).
+
+ elsif File.Before_Upper_Half_Character then
+ End_Of_Line := False;
+ Item := File.Saved_Upper_Half_Character;
+
+ -- Otherwise we must read a character from the input stream
+
else
- ch := Nextc (File);
+ ch := Getc (File);
if ch = LM
or else ch = EOF
or else (ch = PM and then File.Is_Regular_File)
then
End_Of_Line := True;
+ Ungetc (ch, File);
Item := ASCII.NUL;
- else
+
+ -- Case where character obtained does not represent the start of an
+ -- encoded sequence so it stands for itself and we can unget it with
+ -- no difficulty.
+
+ elsif not Is_Start_Of_Encoding
+ (Character'Val (ch), File.WC_Method)
+ then
End_Of_Line := False;
+ Ungetc (ch, File);
Item := Character'Val (ch);
+
+ -- For the start of an encoding, we read the character using the
+ -- Get_Upper_Half_Char routine. It will occupy more than one byte
+ -- so we can't put it back with ungetc. Instead we save it in the
+ -- control block, setting a flag that everyone interested in reading
+ -- characters must test before reading the stream.
+
+ else
+ Item := Get_Upper_Half_Char (Character'Val (ch), File);
+ End_Of_Line := False;
+ File.Saved_Upper_Half_Character := Item;
+ File.Before_Upper_Half_Character := True;
end if;
end if;
end Look_Ahead;
-- 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
Dummy_File_Control_Block : Text_AFCB;
pragma Warnings (Off, Dummy_File_Control_Block);
Text => True);
File.Self := File;
+ Set_WCEM (File);
end Open;
----------
-- 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));
New_Line (File);
end if;
- if fputc (Character'Pos (Item), File.Stream) = EOF then
- raise Device_Error;
+ -- If lower half character, or brackets encoding, output directly
+
+ if Character'Pos (Item) < 16#80#
+ or else File.WC_Method = WCEM_Brackets
+ then
+ if fputc (Character'Pos (Item), File.Stream) = EOF then
+ raise Device_Error;
+ end if;
+
+ -- Case of upper half character with non-brackets encoding
+
+ else
+ Put_Encoded (File, Item);
end if;
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));
New_Line (Current_Out);
end if;
- if fputc (Character'Pos (Item), Current_Out.Stream) = EOF then
- raise Device_Error;
+ -- If lower half character, or brackets encoding, output directly
+
+ if Character'Pos (Item) < 16#80#
+ or else Default_WCEM = WCEM_Brackets
+ then
+ if fputc (Character'Pos (Item), Current_Out.Stream) = EOF then
+ raise Device_Error;
+ end if;
+
+ -- Case of upper half character with non-brackets encoding
+
+ else
+ Put_Encoded (Current_Out, Item);
end if;
Current_Out.Col := Current_Out.Col + 1;
---------
procedure Put
- (File : in File_Type;
- Item : in String)
+ (File : File_Type;
+ Item : String)
is
begin
FIO.Check_Write_Status (AP (File));
+ -- Only have something to do if string is non-null
+
if Item'Length > 0 then
- -- If we have bounded lines, then do things character by
- -- character (this seems a rare case anyway!)
+ -- If we have bounded lines, or if the file encoding is other than
+ -- Brackets and the string has at least one upper half character,
+ -- then output the string character by character.
- if File.Line_Length /= 0 then
+ if File.Line_Length /= 0
+ or else (File.WC_Method /= WCEM_Brackets
+ and then Has_Upper_Half_Character (Item))
+ then
for J in Item'Range loop
Put (File, Item (J));
end loop;
end if;
end Put;
- procedure Put (Item : in String) is
+ procedure Put (Item : String) is
begin
Put (Current_Out, Item);
end Put;
+ -----------------
+ -- Put_Encoded --
+ -----------------
+
+ procedure Put_Encoded (File : File_Type; Char : Character) is
+ procedure Out_Char (C : Character);
+ -- Procedure to output one character of an upper half encoded sequence
+
+ procedure WC_Out is new Wide_Char_To_Char_Sequence (Out_Char);
+
+ --------------
+ -- Out_Char --
+ --------------
+
+ procedure Out_Char (C : Character) is
+ begin
+ Putc (Character'Pos (C), File);
+ end Out_Char;
+
+ -- Start of processing for Put_Encoded
+
+ begin
+ WC_Out (Wide_Character'Val (Character'Pos (Char)), File.WC_Method);
+ end Put_Encoded;
+
--------------
-- Put_Line --
--------------
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));
- -- If we have bounded lines, then just do a put and a new line. In
- -- this case we will end up doing things character by character in
- -- any case, and it is a rare situation.
+ -- If we have bounded lines, or if the file encoding is other than
+ -- Brackets and the string has at least one upper half character, then
+ -- output the string character by character.
+
+ if File.Line_Length /= 0
+ or else (File.WC_Method /= WCEM_Brackets
+ and then Has_Upper_Half_Character (Item))
+ then
+ for J in Item'Range loop
+ Put (File, Item (J));
+ end loop;
- if File.Line_Length /= 0 then
- Put (File, Item);
New_Line (File);
return;
end if;
+ -- Normal case where we do not need to output character by character
+
-- We setup a single string that has the necessary terminators and
-- then write it with a single call. The reason for doing this is
-- that it gives better behavior for the use of Put_Line in multi-
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;
pragma Warnings (Off, Discard_ch);
begin
+ -- Need to deal with Before_Upper_Half_Character ???
+
if File.Mode /= FCB.In_File then
raise Mode_Error;
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))
- if (File = Current_In or else
- File = Current_Out or else
+ if (File = Current_In or else
+ File = Current_Out or else
File = Current_Error)
and then To_FCB (Mode) /= File.Mode
then
end if;
Terminate_Line (File);
- FIO.Reset (AP (File), To_FCB (Mode));
+ FIO.Reset (AP (File)'Unrestricted_Access, To_FCB (Mode));
File.Page := 1;
File.Line := 1;
File.Col := 1;
procedure Reset (File : in out File_Type) is
begin
Terminate_Line (File);
- FIO.Reset (AP (File));
+ FIO.Reset (AP (File)'Unrestricted_Access);
File.Page := 1;
File.Line := 1;
File.Col := 1;
-------------
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;
+ --------------
+ -- Set_WCEM --
+ --------------
+
+ procedure Set_WCEM (File : in out File_Type) is
+ Start : Natural;
+ Stop : Natural;
+
+ begin
+ File.WC_Method := WCEM_Brackets;
+ FIO.Form_Parameter (File.Form.all, "wcem", Start, Stop);
+
+ if Start = 0 then
+ File.WC_Method := WCEM_Brackets;
+
+ else
+ if Stop = Start then
+ for J in WC_Encoding_Letters'Range loop
+ if File.Form (Start) = WC_Encoding_Letters (J) then
+ File.WC_Method := J;
+ return;
+ end if;
+ end loop;
+ end if;
+
+ Close (File);
+ raise Use_Error with "invalid WCEM form parameter";
+ end if;
+ end Set_WCEM;
+
---------------
-- Skip_Line --
---------------
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);
-- up for such files, so we assume an implicit LM in this case.
loop
- exit when ch = LM or ch = EOF;
+ exit when ch = LM or else ch = EOF;
ch := Getc (File);
end loop;
end if;
Ungetc (ch, File);
end if;
end if;
-
end loop;
+
+ File.Before_Upper_Half_Character := False;
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
File.Page := File.Page + 1;
File.Line := 1;
File.Col := 1;
+ File.Before_Upper_Half_Character := False;
end Skip_Page;
procedure Skip_Page is
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;
end if;
end Write;
- -- Use "preallocated" strings to avoid calling "new" during the
- -- elaboration of the run time. This is needed in the tasking case to
- -- avoid calling Task_Lock too early. A filename is expected to end with a
- -- null character in the runtime, here the null characters are added just
- -- to have a correct filename length.
-
- 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 --
- -------------------------------
+ -- Initialize Standard Files
- -- Note: the names in these files are bogus, and probably it would be
- -- better for these files to have no names, but the ACVC test insist!
- -- We use names that are bound to fail in open etc.
+ for J in WC_Encoding_Method loop
+ if WC_Encoding = WC_Encoding_Letters (J) then
+ Default_WCEM := J;
+ end if;
+ end loop;
- Standard_Err.Stream := stderr;
- Standard_Err.Name := Err_Name'Access;
- Standard_Err.Form := Null_Str'Unrestricted_Access;
- Standard_Err.Mode := FCB.Out_File;
- Standard_Err.Is_Regular_File := is_regular_file (fileno (stderr)) /= 0;
- Standard_Err.Is_Temporary_File := False;
- Standard_Err.Is_System_File := True;
- Standard_Err.Is_Text_File := True;
- Standard_Err.Access_Method := 'T';
- Standard_Err.Self := Standard_Err;
-
- Standard_In.Stream := stdin;
- Standard_In.Name := In_Name'Access;
- Standard_In.Form := Null_Str'Unrestricted_Access;
- Standard_In.Mode := FCB.In_File;
- Standard_In.Is_Regular_File := is_regular_file (fileno (stdin)) /= 0;
- Standard_In.Is_Temporary_File := False;
- Standard_In.Is_System_File := True;
- Standard_In.Is_Text_File := True;
- Standard_In.Access_Method := 'T';
- Standard_In.Self := Standard_In;
-
- Standard_Out.Stream := stdout;
- Standard_Out.Name := Out_Name'Access;
- Standard_Out.Form := Null_Str'Unrestricted_Access;
- Standard_Out.Mode := FCB.Out_File;
- Standard_Out.Is_Regular_File := is_regular_file (fileno (stdout)) /= 0;
- Standard_Out.Is_Temporary_File := False;
- Standard_Out.Is_System_File := True;
- Standard_Out.Is_Text_File := True;
- Standard_Out.Access_Method := 'T';
- Standard_Out.Self := Standard_Out;
+ Initialize_Standard_Files;
FIO.Chain_File (AP (Standard_In));
FIO.Chain_File (AP (Standard_Out));
FIO.Chain_File (AP (Standard_Err));
- FIO.Make_Unbuffered (AP (Standard_Out));
- FIO.Make_Unbuffered (AP (Standard_Err));
-
end Ada.Text_IO;
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