-- --
-- S p e c --
-- --
--- Copyright (C) 1992-2006, Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2010, Free Software Foundation, Inc. --
-- --
-- This specification is derived from the Ada Reference Manual for use with --
-- GNAT. The copyright notice above, and the license provisions that follow --
-- --
-- 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, 51 Franklin Street, Fifth Floor, --
--- Boston, MA 02110-1301, 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.IO_Exceptions;
with Ada.Streams;
+
with System;
with System.File_Control_Block;
+with System.WCh_Con;
package Ada.Text_IO is
pragma Elaborate_Body;
Append_File => 3); -- System.File_IO.File_Mode'Pos (Append_File)
type Count is range 0 .. Natural'Last;
- -- The value of Count'Last must be large enough so that the assumption
- -- enough so that the assumption that the Line, Column and Page
- -- counts can never exceed this value is a valid assumption.
+ -- The value of Count'Last must be large enough so that the assumption that
+ -- the Line, Column and Page counts can never exceed this value is valid.
subtype Positive_Count is Count range 1 .. Count'Last;
-- Line and page length
subtype Field is Integer range 0 .. 255;
- -- Note: if for any reason, there is a need to increase this value,
- -- then it will be necessary to change the corresponding value in
- -- System.Img_Real in file s-imgrea.adb.
+ -- Note: if for any reason, there is a need to increase this value, then it
+ -- will be necessary to change the corresponding value in System.Img_Real
+ -- in file s-imgrea.adb.
subtype Number_Base is Integer range 2 .. 16;
Layout_Error : exception renames IO_Exceptions.Layout_Error;
private
+
+ -- The following procedures have a File_Type formal of mode IN OUT because
+ -- they may close the original file. The Close operation may raise an
+ -- exception, but in that case we want any assignment to the formal to
+ -- be effective anyway, so it must be passed by reference (or the caller
+ -- will be left with a dangling pointer).
+
+ pragma Export_Procedure
+ (Internal => Close,
+ External => "",
+ Mechanism => Reference);
+ pragma Export_Procedure
+ (Internal => Delete,
+ External => "",
+ Mechanism => Reference);
+ pragma Export_Procedure
+ (Internal => Reset,
+ External => "",
+ Parameter_Types => (File_Type),
+ Mechanism => Reference);
+ pragma Export_Procedure
+ (Internal => Reset,
+ External => "",
+ Parameter_Types => (File_Type, File_Mode),
+ Mechanism => (File => Reference));
+
-----------------------------------
-- Handling of Format Characters --
-----------------------------------
-- omitted on output unless an explicit New_Page call is made before
-- closing the file. No page mark is added when a file is appended to,
-- so, in accordance with the permission in (RM A.10.2(4)), there may
- -- or may not be a page mark separating preexising text in the file
+ -- or may not be a page mark separating preexisting text in the file
-- from the new text to be written.
-- A file mark is marked by the physical end of file. In DOS translation
-- Text_IO File Control Block --
--------------------------------
+ Default_WCEM : System.WCh_Con.WC_Encoding_Method :=
+ System.WCh_Con.WCEM_UTF8;
+ -- This gets modified during initialization (see body) using
+ -- the default value established in the call to Set_Globals.
+
package FCB renames System.File_Control_Block;
type Text_AFCB;
Self : aliased File_Type;
-- Set to point to the containing Text_AFCB block. This is used to
- -- implement the Current_{Error,Input,Ouput} functions which return
+ -- implement the Current_{Error,Input,Output} functions which return
-- a File_Access, the file access value returned is a pointer to
-- the Self field of the corresponding file.
-- after a LM-PM sequence when logically we are before the LM-PM. This
-- flag can only be set if Before_LM is also set.
+ WC_Method : System.WCh_Con.WC_Encoding_Method := Default_WCEM;
+ -- Encoding method to be used for this file. Text_IO does not deal with
+ -- wide characters, but it does deal with upper half characters in the
+ -- range 16#80#-16#FF# which may need encoding, e.g. in UTF-8 mode.
+
+ Before_Upper_Half_Character : Boolean := False;
+ -- This flag is set to indicate that an encoded upper half character has
+ -- been read by Text_IO.Look_Ahead. If it is set to True, then it means
+ -- that the stream is logically positioned before the character but is
+ -- physically positioned after it. The character involved must be in
+ -- the range 16#80#-16#FF#, i.e. if the flag is set, then we know the
+ -- next character has a code greater than 16#7F#, and the value of this
+ -- character is saved in Saved_Upper_Half_Character.
+
+ Saved_Upper_Half_Character : Character;
+ -- This field is valid only if Before_Upper_Half_Character is set. It
+ -- contains an upper-half character read by Look_Ahead. If Look_Ahead
+ -- reads a character in the range 16#00# to 16#7F#, then it can use
+ -- ungetc to put it back, but ungetc cannot be called more than once,
+ -- so for characters above this range, we don't try to back up the
+ -- file. Instead we save the character in this field and set the flag
+ -- Before_Upper_Half_Character to True to indicate that we are logically
+ -- positioned before this character even though the stream is physically
+ -- positioned after it.
+
end record;
function AFCB_Allocate (Control_Block : Text_AFCB) return FCB.AFCB_Ptr;
-- The Standard Files --
------------------------
- Null_Str : aliased constant String := "";
- -- Used as name and form of standard files
-
- Standard_Err_AFCB : aliased Text_AFCB;
Standard_In_AFCB : aliased Text_AFCB;
Standard_Out_AFCB : aliased Text_AFCB;
+ Standard_Err_AFCB : aliased Text_AFCB;
- Standard_Err : aliased File_Type := Standard_Err_AFCB'Access;
Standard_In : aliased File_Type := Standard_In_AFCB'Access;
Standard_Out : aliased File_Type := Standard_Out_AFCB'Access;
+ Standard_Err : aliased File_Type := Standard_Err_AFCB'Access;
-- Standard files
Current_In : aliased File_Type := Standard_In;
Current_Err : aliased File_Type := Standard_Err;
-- Current files
- -----------------------
- -- Local Subprograms --
- -----------------------
-
- -- These subprograms are in the private part of the spec so that they can
- -- be shared by the routines in the body of Ada.Text_IO.Wide_Text_IO.
-
- -- Note: we use Integer in these declarations instead of the more accurate
- -- Interfaces.C_Streams.int, because we do not want to drag in the spec of
- -- this interfaces package with the spec of Ada.Text_IO, and we know that
- -- in fact these types are identical
-
function EOF_Char return Integer;
-- Returns the system-specific character indicating the end of a text file.
-- This is exported for use by child packages such as Enumeration_Aux to
- -- eliminate their needing to depend directly on Interfaces.C_Streams.
-
- function Getc (File : File_Type) return Integer;
- -- 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 Nextc (File : File_Type) return Integer;
- -- Returns next character from file without skipping past it (i.e. it
- -- is a combination of Getc followed by an Ungetc).
-
- procedure Putc (ch : Integer; 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 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 : Integer; 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.
+ -- eliminate their needing to depend directly on Interfaces.C_Streams,
+ -- which is not available in certain target environments (such as AAMP).
+
+ procedure Initialize_Standard_Files;
+ -- Initializes the file control blocks for the standard files. Called from
+ -- the elaboration routine for this package, and from Reset_Standard_Files
+ -- in package Ada.Text_IO.Reset_Standard_Files.
end Ada.Text_IO;
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