------------------------------------------------------------------------------ -- -- -- GNAT RUN-TIME COMPONENTS -- -- -- -- A D A . W I D E _ W I D E _ T E X T _ I O -- -- -- -- S p e c -- -- -- -- Copyright (C) 1992-2021, 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 -- -- apply solely to the contents of the part following the private keyword. -- -- -- -- 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 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. -- -- -- -- 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 -- -- . -- -- -- -- GNAT was originally developed by the GNAT team at New York University. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- -- -- ------------------------------------------------------------------------------ -- Note: the generic subpackages of Wide_Wide_Text_IO (Integer_IO, Float_IO, -- Fixed_IO, Modular_IO, Decimal_IO and Enumeration_IO) appear as private -- children in GNAT. These children are with'ed automatically if they are -- referenced, so this rearrangement is invisible to user programs, but has -- the advantage that only the needed parts of Wide_Wide_Text_IO are processed -- and loaded. with Ada.IO_Exceptions; with Ada.Streams; with Interfaces.C_Streams; with System; with System.File_Control_Block; with System.WCh_Con; package Ada.Wide_Wide_Text_IO is type File_Type is limited private with Default_Initial_Condition; type File_Mode is (In_File, Out_File, Append_File); -- The following representation clause allows the use of unchecked -- conversion for rapid translation between the File_Mode type -- used in this package and System.File_IO. for File_Mode use (In_File => 0, -- System.FIle_IO.File_Mode'Pos (In_File) Out_File => 2, -- System.File_IO.File_Mode'Pos (Out_File) 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 that -- the Line, Column and Page counts can never exceed this value is valid. subtype Positive_Count is Count range 1 .. Count'Last; Unbounded : constant Count := 0; -- Line and page length subtype Field is Integer range 0 .. 255; subtype Number_Base is Integer range 2 .. 16; type Type_Set is (Lower_Case, Upper_Case); --------------------- -- File Management -- --------------------- procedure Create (File : in out File_Type; Mode : File_Mode := Out_File; Name : String := ""; Form : String := ""); procedure Open (File : in out File_Type; Mode : File_Mode; Name : String; Form : String := ""); procedure Close (File : in out File_Type); procedure Delete (File : in out File_Type); procedure Reset (File : in out File_Type; Mode : File_Mode); procedure Reset (File : in out File_Type); function Mode (File : File_Type) return File_Mode; function Name (File : File_Type) return String; function Form (File : File_Type) return String; function Is_Open (File : File_Type) return Boolean; ------------------------------------------------------ -- Control of default input, output and error files -- ------------------------------------------------------ procedure Set_Input (File : File_Type); procedure Set_Output (File : File_Type); procedure Set_Error (File : File_Type); function Standard_Input return File_Type; function Standard_Output return File_Type; function Standard_Error return File_Type; function Current_Input return File_Type; function Current_Output return File_Type; function Current_Error return File_Type; type File_Access is access constant File_Type; function Standard_Input return File_Access; function Standard_Output return File_Access; function Standard_Error return File_Access; function Current_Input return File_Access; function Current_Output return File_Access; function Current_Error return File_Access; -------------------- -- Buffer control -- -------------------- -- Note: The parameter file is in out in the RM, but as pointed out -- in <<95-5166.a Tucker Taft 95-6-23>> this is clearly an oversight. procedure Flush (File : File_Type); procedure Flush; -------------------------------------------- -- Specification of line and page lengths -- -------------------------------------------- procedure Set_Line_Length (File : File_Type; To : Count); procedure Set_Line_Length (To : Count); procedure Set_Page_Length (File : File_Type; To : Count); procedure Set_Page_Length (To : Count); function Line_Length (File : File_Type) return Count; function Line_Length return Count; function Page_Length (File : File_Type) return Count; function Page_Length return Count; ------------------------------------ -- Column, Line, and Page Control -- ------------------------------------ procedure New_Line (File : File_Type; Spacing : Positive_Count := 1); procedure New_Line (Spacing : Positive_Count := 1); procedure Skip_Line (File : File_Type; Spacing : Positive_Count := 1); procedure Skip_Line (Spacing : Positive_Count := 1); function End_Of_Line (File : File_Type) return Boolean; function End_Of_Line return Boolean; procedure New_Page (File : File_Type); procedure New_Page; procedure Skip_Page (File : File_Type); procedure Skip_Page; function End_Of_Page (File : File_Type) return Boolean; function End_Of_Page return Boolean; function End_Of_File (File : File_Type) return Boolean; function End_Of_File return Boolean; procedure Set_Col (File : File_Type; To : Positive_Count); procedure Set_Col (To : Positive_Count); procedure Set_Line (File : File_Type; To : Positive_Count); procedure Set_Line (To : Positive_Count); function Col (File : File_Type) return Positive_Count; function Col return Positive_Count; function Line (File : File_Type) return Positive_Count; function Line return Positive_Count; function Page (File : File_Type) return Positive_Count; function Page return Positive_Count; ---------------------------- -- Character Input-Output -- ---------------------------- procedure Get (File : File_Type; Item : out Wide_Wide_Character); procedure Get (Item : out Wide_Wide_Character); procedure Put (File : File_Type; Item : Wide_Wide_Character); procedure Put (Item : Wide_Wide_Character); procedure Look_Ahead (File : File_Type; Item : out Wide_Wide_Character; End_Of_Line : out Boolean); procedure Look_Ahead (Item : out Wide_Wide_Character; End_Of_Line : out Boolean); procedure Get_Immediate (File : File_Type; Item : out Wide_Wide_Character); procedure Get_Immediate (Item : out Wide_Wide_Character); procedure Get_Immediate (File : File_Type; Item : out Wide_Wide_Character; Available : out Boolean); procedure Get_Immediate (Item : out Wide_Wide_Character; Available : out Boolean); ------------------------- -- String Input-Output -- ------------------------- procedure Get (File : File_Type; Item : out Wide_Wide_String); procedure Get (Item : out Wide_Wide_String); procedure Put (File : File_Type; Item : Wide_Wide_String); procedure Put (Item : Wide_Wide_String); procedure Get_Line (File : File_Type; Item : out Wide_Wide_String; Last : out Natural); function Get_Line (File : File_Type) return Wide_Wide_String; pragma Ada_05 (Get_Line); function Get_Line return Wide_Wide_String; pragma Ada_05 (Get_Line); procedure Get_Line (Item : out Wide_Wide_String; Last : out Natural); procedure Put_Line (File : File_Type; Item : Wide_Wide_String); procedure Put_Line (Item : Wide_Wide_String); --------------------------------------- -- Generic packages for Input-Output -- --------------------------------------- -- The generic packages: -- Ada.Wide_Wide_Text_IO.Integer_IO -- Ada.Wide_Wide_Text_IO.Modular_IO -- Ada.Wide_Wide_Text_IO.Float_IO -- Ada.Wide_Wide_Text_IO.Fixed_IO -- Ada.Wide_Wide_Text_IO.Decimal_IO -- Ada.Wide_Wide_Text_IO.Enumeration_IO -- are implemented as separate child packages in GNAT, so the -- spec and body of these packages are to be found in separate -- child units. This implementation detail is hidden from the -- Ada programmer by special circuitry in the compiler that -- treats these child packages as though they were nested in -- Text_IO. The advantage of this special processing is that -- the subsidiary routines needed if these generics are used -- are not loaded when they are not used. ---------------- -- Exceptions -- ---------------- Status_Error : exception renames IO_Exceptions.Status_Error; Mode_Error : exception renames IO_Exceptions.Mode_Error; Name_Error : exception renames IO_Exceptions.Name_Error; Use_Error : exception renames IO_Exceptions.Use_Error; Device_Error : exception renames IO_Exceptions.Device_Error; End_Error : exception renames IO_Exceptions.End_Error; Data_Error : exception renames IO_Exceptions.Data_Error; 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)); package WCh_Con renames System.WCh_Con; ----------------------------------- -- Handling of Format Characters -- ----------------------------------- -- Line marks are represented by the single character ASCII.LF (16#0A#). -- In DOS and similar systems, underlying file translation takes care -- of translating this to and from the standard CR/LF sequences used in -- these operating systems to mark the end of a line. On output there is -- always a line mark at the end of the last line, but on input, this -- line mark can be omitted, and is implied by the end of file. -- Page marks are represented by the single character ASCII.FF (16#0C#), -- The page mark at the end of the file may be omitted, and is normally -- 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 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 -- mode on input, an EOF character (SUB = 16#1A#) gets translated to the -- physical end of file, so in effect this character is recognized as -- marking the end of file in DOS and similar systems. LM : constant := Character'Pos (ASCII.LF); -- Used as line mark PM : constant := Character'Pos (ASCII.FF); -- Used as page mark, except at end of file where it is implied ------------------------------------------ -- Wide_Wide_Text_IO File Control Block -- ------------------------------------------ Default_WCEM : WCh_Con.WC_Encoding_Method := 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 Wide_Wide_Text_AFCB is new FCB.AFCB with record Page : Count := 1; Line : Count := 1; Col : Count := 1; Line_Length : Count := 0; Page_Length : Count := 0; Self : aliased File_Type; -- Set to point to the containing Text_AFCB block. This is used to -- 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. Before_LM : Boolean := False; -- This flag is used to deal with the anomalies introduced by the -- peculiar definition of End_Of_File and End_Of_Page in Ada. These -- functions require looking ahead more than one character. Since -- there is no convenient way of backing up more than one character, -- what we do is to leave ourselves positioned past the LM, but set -- this flag, so that we know that from an Ada point of view we are -- in front of the LM, not after it. A bit odd, but it works. Before_LM_PM : Boolean := False; -- This flag similarly handles the case of being physically positioned -- 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 : WCh_Con.WC_Encoding_Method := Default_WCEM; -- Encoding method to be used for this file Before_Wide_Wide_Character : Boolean := False; -- This flag is set to indicate that a wide character in the input has -- been read by Wide_Wide_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 not be in the range 16#00#-16#7F#, 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_Wide_Wide_Character. Saved_Wide_Wide_Character : Wide_Wide_Character; -- This field is valid only if Before_Wide_Wide_Character is set. It -- contains a wide character read by Look_Ahead. If Look_Ahead -- reads a character in the range 16#0000# to 16#007F#, 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_Wide_Wide_Character to indicate that -- we are logically positioned before this character even though -- the stream is physically positioned after it. end record; type File_Type is access all Wide_Wide_Text_AFCB; function AFCB_Allocate (Control_Block : Wide_Wide_Text_AFCB) return FCB.AFCB_Ptr; procedure AFCB_Close (File : not null access Wide_Wide_Text_AFCB); procedure AFCB_Free (File : not null access Wide_Wide_Text_AFCB); procedure Read (File : in out Wide_Wide_Text_AFCB; Item : out Ada.Streams.Stream_Element_Array; Last : out Ada.Streams.Stream_Element_Offset); -- Read operation used when Wide_Wide_Text_IO file is treated as a Stream procedure Write (File : in out Wide_Wide_Text_AFCB; Item : Ada.Streams.Stream_Element_Array); -- Write operation used when Wide_Wide_Text_IO file is treated as a Stream ------------------------ -- The Standard Files -- ------------------------ Standard_Err_AFCB : aliased Wide_Wide_Text_AFCB; Standard_In_AFCB : aliased Wide_Wide_Text_AFCB; Standard_Out_AFCB : aliased Wide_Wide_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 files Current_In : aliased File_Type := Standard_In; Current_Out : aliased File_Type := Standard_Out; Current_Err : aliased File_Type := Standard_Err; -- Current files 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.Wide_Wide_Text_IO.Reset_Standard_Files. ----------------------- -- Local Subprograms -- ----------------------- -- These subprograms are in the private part of the spec so that they can -- be shared by the children of Ada.Text_IO.Wide_Wide_Text_IO. function Getc (File : File_Type) return Interfaces.C_Streams.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. procedure Get_Character (File : File_Type; Item : out Character); -- This is essentially copy of Wide_Wide_Text_IO.Get. It obtains a single -- obtains a single character from the input file File, and places it in -- Item. This result may be the leading character of a Wide_Wide_Character -- sequence, but that is up to the caller to deal with. function Get_Wide_Wide_Char (C : Character; File : File_Type) return Wide_Wide_Character; -- This function is shared by Get and Get_Immediate to extract a wide -- character value from the given File. The first byte has already been -- read and is passed in C. The wide character value is returned as the -- result, and the file pointer is bumped past the character. function Nextc (File : File_Type) return Interfaces.C_Streams.int; -- Returns next character from file without skipping past it (i.e. it is a -- combination of Getc followed by an Ungetc). end Ada.Wide_Wide_Text_IO;