1967 lines
52 KiB
Ada
1967 lines
52 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- A D A . W I D E _ T E X T _ I O --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1992-2014, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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with Ada.Streams; use Ada.Streams;
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with Interfaces.C_Streams; use Interfaces.C_Streams;
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with System.CRTL;
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with System.File_IO;
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with System.WCh_Cnv; use System.WCh_Cnv;
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with System.WCh_Con; use System.WCh_Con;
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with Ada.Unchecked_Conversion;
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with Ada.Unchecked_Deallocation;
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pragma Elaborate_All (System.File_IO);
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-- Needed because of calls to Chain_File in package body elaboration
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package body Ada.Wide_Text_IO is
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package FIO renames System.File_IO;
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subtype AP is FCB.AFCB_Ptr;
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function To_FCB is new Ada.Unchecked_Conversion (File_Mode, FCB.File_Mode);
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function To_TIO is new Ada.Unchecked_Conversion (FCB.File_Mode, File_Mode);
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use type FCB.File_Mode;
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use type System.CRTL.size_t;
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WC_Encoding : Character;
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pragma Import (C, WC_Encoding, "__gl_wc_encoding");
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-- Default wide character encoding
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Err_Name : aliased String := "*stderr" & ASCII.NUL;
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In_Name : aliased String := "*stdin" & ASCII.NUL;
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Out_Name : aliased String := "*stdout" & ASCII.NUL;
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-- Names of standard files
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--
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-- Use "preallocated" strings to avoid calling "new" during the elaboration
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-- of the run time. This is needed in the tasking case to avoid calling
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-- Task_Lock too early. A filename is expected to end with a null character
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-- in the runtime, here the null characters are added just to have a
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-- correct filename length.
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--
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-- Note: the names for these files are bogus, and probably it would be
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-- better for these files to have no names, but the ACVC tests insist.
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-- We use names that are bound to fail in open etc.
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Null_Str : aliased constant String := "";
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-- Used as form string for standard files
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-----------------------
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-- Local Subprograms --
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-----------------------
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function Get_Wide_Char_Immed
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(C : Character;
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File : File_Type) return Wide_Character;
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-- This routine is identical to Get_Wide_Char, except that the reads are
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-- done in Get_Immediate mode (i.e. without waiting for a line return).
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function Getc_Immed (File : File_Type) return int;
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-- This routine is identical to Getc, except that the read is done in
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-- Get_Immediate mode (i.e. without waiting for a line return).
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procedure Putc (ch : int; File : File_Type);
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-- Outputs the given character to the file, which has already been checked
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-- for being in output status. Device_Error is raised if the character
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-- cannot be written.
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procedure Set_WCEM (File : in out File_Type);
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-- Called by Open and Create to set the wide character encoding method for
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-- the file, processing a WCEM form parameter if one is present. File is
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-- IN OUT because it may be closed in case of an error.
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procedure Terminate_Line (File : File_Type);
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-- If the file is in Write_File or Append_File mode, and the current line
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-- is not terminated, then a line terminator is written using New_Line.
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-- Note that there is no Terminate_Page routine, because the page mark at
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-- the end of the file is implied if necessary.
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procedure Ungetc (ch : int; File : File_Type);
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-- Pushes back character into stream, using ungetc. The caller has checked
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-- that the file is in read status. Device_Error is raised if the character
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-- cannot be pushed back. An attempt to push back and end of file character
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-- (EOF) is ignored.
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-------------------
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-- AFCB_Allocate --
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-------------------
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function AFCB_Allocate
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(Control_Block : Wide_Text_AFCB) return FCB.AFCB_Ptr
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is
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pragma Unreferenced (Control_Block);
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begin
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return new Wide_Text_AFCB;
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end AFCB_Allocate;
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----------------
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-- AFCB_Close --
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----------------
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procedure AFCB_Close (File : not null access Wide_Text_AFCB) is
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begin
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-- If the file being closed is one of the current files, then close
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-- the corresponding current file. It is not clear that this action
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-- is required (RM A.10.3(23)) but it seems reasonable, and besides
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-- ACVC test CE3208A expects this behavior.
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if File_Type (File) = Current_In then
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Current_In := null;
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elsif File_Type (File) = Current_Out then
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Current_Out := null;
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elsif File_Type (File) = Current_Err then
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Current_Err := null;
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end if;
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Terminate_Line (File_Type (File));
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end AFCB_Close;
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---------------
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-- AFCB_Free --
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---------------
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procedure AFCB_Free (File : not null access Wide_Text_AFCB) is
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type FCB_Ptr is access all Wide_Text_AFCB;
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FT : FCB_Ptr := FCB_Ptr (File);
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procedure Free is
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new Ada.Unchecked_Deallocation (Wide_Text_AFCB, FCB_Ptr);
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begin
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Free (FT);
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end AFCB_Free;
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-----------
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-- Close --
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-----------
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procedure Close (File : in out File_Type) is
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begin
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FIO.Close (AP (File)'Unrestricted_Access);
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end Close;
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---------
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-- Col --
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---------
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-- Note: we assume that it is impossible in practice for the column
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-- to exceed the value of Count'Last, i.e. no check is required for
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-- overflow raising layout error.
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function Col (File : File_Type) return Positive_Count is
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begin
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FIO.Check_File_Open (AP (File));
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return File.Col;
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end Col;
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function Col return Positive_Count is
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begin
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return Col (Current_Out);
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end Col;
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------------
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-- Create --
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------------
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procedure Create
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(File : in out File_Type;
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Mode : File_Mode := Out_File;
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Name : String := "";
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Form : String := "")
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is
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Dummy_File_Control_Block : Wide_Text_AFCB;
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pragma Warnings (Off, Dummy_File_Control_Block);
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-- Yes, we know this is never assigned a value, only the tag
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-- is used for dispatching purposes, so that's expected.
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begin
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FIO.Open (File_Ptr => AP (File),
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Dummy_FCB => Dummy_File_Control_Block,
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Mode => To_FCB (Mode),
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Name => Name,
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Form => Form,
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Amethod => 'W',
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Creat => True,
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Text => True);
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File.Self := File;
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Set_WCEM (File);
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end Create;
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-------------------
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-- Current_Error --
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-------------------
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function Current_Error return File_Type is
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begin
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return Current_Err;
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end Current_Error;
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function Current_Error return File_Access is
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begin
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return Current_Err.Self'Access;
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end Current_Error;
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-------------------
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-- Current_Input --
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-------------------
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function Current_Input return File_Type is
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begin
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return Current_In;
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end Current_Input;
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function Current_Input return File_Access is
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begin
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return Current_In.Self'Access;
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end Current_Input;
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--------------------
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-- Current_Output --
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--------------------
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function Current_Output return File_Type is
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begin
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return Current_Out;
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end Current_Output;
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function Current_Output return File_Access is
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begin
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return Current_Out.Self'Access;
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end Current_Output;
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------------
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-- Delete --
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------------
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procedure Delete (File : in out File_Type) is
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begin
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FIO.Delete (AP (File)'Unrestricted_Access);
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end Delete;
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-----------------
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-- End_Of_File --
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-----------------
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function End_Of_File (File : File_Type) return Boolean is
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ch : int;
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begin
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FIO.Check_Read_Status (AP (File));
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if File.Before_Wide_Character then
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return False;
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elsif File.Before_LM then
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if File.Before_LM_PM then
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return Nextc (File) = EOF;
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end if;
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else
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ch := Getc (File);
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if ch = EOF then
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return True;
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elsif ch /= LM then
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Ungetc (ch, File);
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return False;
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else -- ch = LM
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File.Before_LM := True;
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end if;
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end if;
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-- Here we are just past the line mark with Before_LM set so that we
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-- do not have to try to back up past the LM, thus avoiding the need
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-- to back up more than one character.
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ch := Getc (File);
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if ch = EOF then
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return True;
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elsif ch = PM and then File.Is_Regular_File then
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File.Before_LM_PM := True;
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return Nextc (File) = EOF;
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-- Here if neither EOF nor PM followed end of line
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else
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Ungetc (ch, File);
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return False;
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end if;
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end End_Of_File;
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function End_Of_File return Boolean is
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begin
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return End_Of_File (Current_In);
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end End_Of_File;
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-----------------
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-- End_Of_Line --
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-----------------
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function End_Of_Line (File : File_Type) return Boolean is
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ch : int;
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begin
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FIO.Check_Read_Status (AP (File));
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if File.Before_Wide_Character then
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return False;
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elsif File.Before_LM then
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return True;
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else
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ch := Getc (File);
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if ch = EOF then
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return True;
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else
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Ungetc (ch, File);
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return (ch = LM);
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end if;
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end if;
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end End_Of_Line;
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function End_Of_Line return Boolean is
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begin
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return End_Of_Line (Current_In);
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end End_Of_Line;
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-----------------
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-- End_Of_Page --
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-----------------
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function End_Of_Page (File : File_Type) return Boolean is
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ch : int;
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begin
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FIO.Check_Read_Status (AP (File));
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if not File.Is_Regular_File then
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return False;
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elsif File.Before_Wide_Character then
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return False;
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elsif File.Before_LM then
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if File.Before_LM_PM then
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return True;
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end if;
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else
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ch := Getc (File);
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if ch = EOF then
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return True;
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elsif ch /= LM then
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Ungetc (ch, File);
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return False;
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else -- ch = LM
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File.Before_LM := True;
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end if;
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end if;
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-- Here we are just past the line mark with Before_LM set so that we
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-- do not have to try to back up past the LM, thus avoiding the need
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-- to back up more than one character.
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ch := Nextc (File);
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return ch = PM or else ch = EOF;
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end End_Of_Page;
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function End_Of_Page return Boolean is
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begin
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return End_Of_Page (Current_In);
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end End_Of_Page;
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-----------
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-- Flush --
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-----------
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procedure Flush (File : File_Type) is
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begin
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FIO.Flush (AP (File));
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end Flush;
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procedure Flush is
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begin
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Flush (Current_Out);
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end Flush;
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----------
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-- Form --
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----------
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function Form (File : File_Type) return String is
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begin
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return FIO.Form (AP (File));
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end Form;
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---------
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-- Get --
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---------
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procedure Get
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(File : File_Type;
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Item : out Wide_Character)
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is
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C : Character;
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begin
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FIO.Check_Read_Status (AP (File));
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if File.Before_Wide_Character then
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File.Before_Wide_Character := False;
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Item := File.Saved_Wide_Character;
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-- Ada.Text_IO checks Before_LM_PM here, shouldn't we do the same???
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else
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Get_Character (File, C);
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Item := Get_Wide_Char (C, File);
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end if;
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end Get;
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procedure Get (Item : out Wide_Character) is
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begin
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Get (Current_In, Item);
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end Get;
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procedure Get
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(File : File_Type;
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Item : out Wide_String)
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is
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begin
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for J in Item'Range loop
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Get (File, Item (J));
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end loop;
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end Get;
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procedure Get (Item : out Wide_String) is
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begin
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Get (Current_In, Item);
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end Get;
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-------------------
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-- Get_Character --
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-------------------
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procedure Get_Character
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(File : File_Type;
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Item : out Character)
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is
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ch : int;
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begin
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if File.Before_LM then
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File.Before_LM := False;
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File.Before_LM_PM := False;
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File.Col := 1;
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if File.Before_LM_PM then
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File.Line := 1;
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File.Page := File.Page + 1;
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File.Before_LM_PM := False;
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else
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File.Line := File.Line + 1;
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end if;
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end if;
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loop
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ch := Getc (File);
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if ch = EOF then
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raise End_Error;
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elsif ch = LM then
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File.Line := File.Line + 1;
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File.Col := 1;
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elsif ch = PM and then File.Is_Regular_File then
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File.Page := File.Page + 1;
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File.Line := 1;
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else
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Item := Character'Val (ch);
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File.Col := File.Col + 1;
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return;
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end if;
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end loop;
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end Get_Character;
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-------------------
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-- Get_Immediate --
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-------------------
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procedure Get_Immediate
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(File : File_Type;
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Item : out Wide_Character)
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is
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ch : int;
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begin
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FIO.Check_Read_Status (AP (File));
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if File.Before_Wide_Character then
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File.Before_Wide_Character := False;
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Item := File.Saved_Wide_Character;
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elsif File.Before_LM then
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File.Before_LM := False;
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File.Before_LM_PM := False;
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Item := Wide_Character'Val (LM);
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else
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ch := Getc_Immed (File);
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if ch = EOF then
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raise End_Error;
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else
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Item := Get_Wide_Char_Immed (Character'Val (ch), File);
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end if;
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end if;
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end Get_Immediate;
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procedure Get_Immediate
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(Item : out Wide_Character)
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is
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begin
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Get_Immediate (Current_In, Item);
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end Get_Immediate;
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procedure Get_Immediate
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(File : File_Type;
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Item : out Wide_Character;
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Available : out Boolean)
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is
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ch : int;
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begin
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FIO.Check_Read_Status (AP (File));
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Available := True;
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if File.Before_Wide_Character then
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File.Before_Wide_Character := False;
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Item := File.Saved_Wide_Character;
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elsif File.Before_LM then
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File.Before_LM := False;
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File.Before_LM_PM := False;
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Item := Wide_Character'Val (LM);
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else
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-- Shouldn't we use getc_immediate_nowait here, like Text_IO???
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ch := Getc_Immed (File);
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if ch = EOF then
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raise End_Error;
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else
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Item := Get_Wide_Char_Immed (Character'Val (ch), File);
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end if;
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end if;
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end Get_Immediate;
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procedure Get_Immediate
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(Item : out Wide_Character;
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Available : out Boolean)
|
|
is
|
|
begin
|
|
Get_Immediate (Current_In, Item, Available);
|
|
end Get_Immediate;
|
|
|
|
--------------
|
|
-- Get_Line --
|
|
--------------
|
|
|
|
procedure Get_Line
|
|
(File : File_Type;
|
|
Item : out Wide_String;
|
|
Last : out Natural)
|
|
is
|
|
begin
|
|
FIO.Check_Read_Status (AP (File));
|
|
Last := Item'First - 1;
|
|
|
|
-- 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.
|
|
|
|
if Last >= Item'Last then
|
|
return;
|
|
end if;
|
|
|
|
-- 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.
|
|
|
|
if File.Before_LM then
|
|
File.Before_LM := False;
|
|
File.Before_LM_PM := False;
|
|
|
|
-- Otherwise we need to read some characters
|
|
|
|
else
|
|
-- 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))
|
|
|
|
if Nextc (File) = EOF then
|
|
raise End_Error;
|
|
end if;
|
|
|
|
-- Loop through characters in string
|
|
|
|
loop
|
|
-- Exit the loop if read is terminated by encountering line mark
|
|
-- Note that the use of Skip_Line here ensures we properly deal
|
|
-- with setting the page and line numbers.
|
|
|
|
if End_Of_Line (File) then
|
|
Skip_Line (File);
|
|
return;
|
|
end if;
|
|
|
|
-- 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;
|
|
Get (File, Item (Last));
|
|
|
|
-- 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;
|
|
|
|
-- Exit from the loop if we are at the end of file. This happens
|
|
-- if we have a last line that is not terminated with a line mark.
|
|
-- In this case we consider that there is an implied line mark;
|
|
-- this is a non-standard file, but we will treat it nicely.
|
|
|
|
exit when Nextc (File) = EOF;
|
|
end loop;
|
|
end if;
|
|
end Get_Line;
|
|
|
|
procedure Get_Line
|
|
(Item : out Wide_String;
|
|
Last : out Natural)
|
|
is
|
|
begin
|
|
Get_Line (Current_In, Item, Last);
|
|
end Get_Line;
|
|
|
|
function Get_Line (File : File_Type) return Wide_String is
|
|
Buffer : Wide_String (1 .. 500);
|
|
Last : Natural;
|
|
|
|
function Get_Rest (S : Wide_String) return Wide_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 : Wide_String) return Wide_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 : Wide_String (1 .. S'Length);
|
|
Last : Natural;
|
|
|
|
begin
|
|
Get_Line (File, Buffer, Last);
|
|
|
|
declare
|
|
R : constant Wide_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 Wide_String is
|
|
begin
|
|
return Get_Line (Current_In);
|
|
end Get_Line;
|
|
|
|
-------------------
|
|
-- Get_Wide_Char --
|
|
-------------------
|
|
|
|
function Get_Wide_Char
|
|
(C : Character;
|
|
File : File_Type) return Wide_Character
|
|
is
|
|
function In_Char return Character;
|
|
-- Function used to obtain additional characters it the wide character
|
|
-- sequence is more than one character long.
|
|
|
|
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;
|
|
|
|
-- Start of processing for Get_Wide_Char
|
|
|
|
begin
|
|
FIO.Check_Read_Status (AP (File));
|
|
return WC_In (C, File.WC_Method);
|
|
end Get_Wide_Char;
|
|
|
|
-------------------------
|
|
-- Get_Wide_Char_Immed --
|
|
-------------------------
|
|
|
|
function Get_Wide_Char_Immed
|
|
(C : Character;
|
|
File : File_Type) return Wide_Character
|
|
is
|
|
function In_Char return Character;
|
|
-- Function used to obtain additional characters it the wide character
|
|
-- sequence is more than one character long.
|
|
|
|
function WC_In is new Char_Sequence_To_Wide_Char (In_Char);
|
|
|
|
-------------
|
|
-- In_Char --
|
|
-------------
|
|
|
|
function In_Char return Character is
|
|
ch : constant Integer := Getc_Immed (File);
|
|
begin
|
|
if ch = EOF then
|
|
raise End_Error;
|
|
else
|
|
return Character'Val (ch);
|
|
end if;
|
|
end In_Char;
|
|
|
|
-- Start of processing for Get_Wide_Char_Immed
|
|
|
|
begin
|
|
FIO.Check_Read_Status (AP (File));
|
|
return WC_In (C, File.WC_Method);
|
|
end Get_Wide_Char_Immed;
|
|
|
|
----------
|
|
-- Getc --
|
|
----------
|
|
|
|
function Getc (File : File_Type) return int is
|
|
ch : int;
|
|
|
|
begin
|
|
ch := fgetc (File.Stream);
|
|
|
|
if ch = EOF and then ferror (File.Stream) /= 0 then
|
|
raise Device_Error;
|
|
else
|
|
return ch;
|
|
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;
|
|
|
|
-------------------------------
|
|
-- 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.Text_Encoding := Default_Text;
|
|
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.Text_Encoding := Default_Text;
|
|
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.Text_Encoding := Default_Text;
|
|
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 : File_Type) return Boolean is
|
|
begin
|
|
return FIO.Is_Open (AP (File));
|
|
end Is_Open;
|
|
|
|
----------
|
|
-- Line --
|
|
----------
|
|
|
|
-- Note: we assume that it is impossible in practice for the line to exceed
|
|
-- the value of Count'Last, i.e. no check is required for overflow raising
|
|
-- layout error.
|
|
|
|
function Line (File : File_Type) return Positive_Count is
|
|
begin
|
|
FIO.Check_File_Open (AP (File));
|
|
return File.Line;
|
|
end Line;
|
|
|
|
function Line return Positive_Count is
|
|
begin
|
|
return Line (Current_Out);
|
|
end Line;
|
|
|
|
-----------------
|
|
-- Line_Length --
|
|
-----------------
|
|
|
|
function Line_Length (File : File_Type) return Count is
|
|
begin
|
|
FIO.Check_Write_Status (AP (File));
|
|
return File.Line_Length;
|
|
end Line_Length;
|
|
|
|
function Line_Length return Count is
|
|
begin
|
|
return Line_Length (Current_Out);
|
|
end Line_Length;
|
|
|
|
----------------
|
|
-- Look_Ahead --
|
|
----------------
|
|
|
|
procedure Look_Ahead
|
|
(File : File_Type;
|
|
Item : out Wide_Character;
|
|
End_Of_Line : out Boolean)
|
|
is
|
|
ch : int;
|
|
|
|
-- Start of processing for Look_Ahead
|
|
|
|
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 := Wide_Character'Val (0);
|
|
|
|
-- If we are before a wide character, just return it (this can happen
|
|
-- if there are two calls to Look_Ahead in a row).
|
|
|
|
elsif File.Before_Wide_Character then
|
|
End_Of_Line := False;
|
|
Item := File.Saved_Wide_Character;
|
|
|
|
-- otherwise we must read a character from the input stream
|
|
|
|
else
|
|
ch := Getc (File);
|
|
|
|
if ch = LM
|
|
or else ch = EOF
|
|
or else (ch = EOF and then File.Is_Regular_File)
|
|
then
|
|
End_Of_Line := True;
|
|
Ungetc (ch, File);
|
|
Item := Wide_Character'Val (0);
|
|
|
|
-- 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 := Wide_Character'Val (ch);
|
|
|
|
-- For the start of an encoding, we read the character using the
|
|
-- Get_Wide_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_Wide_Char (Character'Val (ch), File);
|
|
End_Of_Line := False;
|
|
File.Saved_Wide_Character := Item;
|
|
File.Before_Wide_Character := True;
|
|
end if;
|
|
end if;
|
|
end Look_Ahead;
|
|
|
|
procedure Look_Ahead
|
|
(Item : out Wide_Character;
|
|
End_Of_Line : out Boolean)
|
|
is
|
|
begin
|
|
Look_Ahead (Current_In, Item, End_Of_Line);
|
|
end Look_Ahead;
|
|
|
|
----------
|
|
-- Mode --
|
|
----------
|
|
|
|
function Mode (File : File_Type) return File_Mode is
|
|
begin
|
|
return To_TIO (FIO.Mode (AP (File)));
|
|
end Mode;
|
|
|
|
----------
|
|
-- Name --
|
|
----------
|
|
|
|
function Name (File : File_Type) return String is
|
|
begin
|
|
return FIO.Name (AP (File));
|
|
end Name;
|
|
|
|
--------------
|
|
-- New_Line --
|
|
--------------
|
|
|
|
procedure New_Line
|
|
(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 not Spacing'Valid then
|
|
raise Constraint_Error;
|
|
end if;
|
|
|
|
FIO.Check_Write_Status (AP (File));
|
|
|
|
for K in 1 .. Spacing loop
|
|
|
|
-- We use Put here (rather than Putc) so that we get the proper
|
|
-- behavior on windows for output of Wide_String to the console.
|
|
|
|
Put (File, Wide_Character'Val (LM));
|
|
|
|
File.Line := File.Line + 1;
|
|
|
|
if File.Page_Length /= 0 and then File.Line > File.Page_Length then
|
|
|
|
-- Same situation as above, use Put instead of Putc
|
|
|
|
Put (File, Wide_Character'Val (PM));
|
|
|
|
File.Line := 1;
|
|
File.Page := File.Page + 1;
|
|
end if;
|
|
end loop;
|
|
|
|
File.Col := 1;
|
|
end New_Line;
|
|
|
|
procedure New_Line (Spacing : Positive_Count := 1) is
|
|
begin
|
|
New_Line (Current_Out, Spacing);
|
|
end New_Line;
|
|
|
|
--------------
|
|
-- New_Page --
|
|
--------------
|
|
|
|
procedure New_Page (File : File_Type) is
|
|
begin
|
|
FIO.Check_Write_Status (AP (File));
|
|
|
|
if File.Col /= 1 or else File.Line = 1 then
|
|
Putc (LM, File);
|
|
end if;
|
|
|
|
Putc (PM, File);
|
|
File.Page := File.Page + 1;
|
|
File.Line := 1;
|
|
File.Col := 1;
|
|
end New_Page;
|
|
|
|
procedure New_Page is
|
|
begin
|
|
New_Page (Current_Out);
|
|
end New_Page;
|
|
|
|
-----------
|
|
-- Nextc --
|
|
-----------
|
|
|
|
function Nextc (File : File_Type) return int is
|
|
ch : int;
|
|
|
|
begin
|
|
ch := fgetc (File.Stream);
|
|
|
|
if ch = EOF then
|
|
if ferror (File.Stream) /= 0 then
|
|
raise Device_Error;
|
|
end if;
|
|
|
|
else
|
|
if ungetc (ch, File.Stream) = EOF then
|
|
raise Device_Error;
|
|
end if;
|
|
end if;
|
|
|
|
return ch;
|
|
end Nextc;
|
|
|
|
----------
|
|
-- Open --
|
|
----------
|
|
|
|
procedure Open
|
|
(File : in out File_Type;
|
|
Mode : File_Mode;
|
|
Name : String;
|
|
Form : String := "")
|
|
is
|
|
Dummy_File_Control_Block : Wide_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 => Dummy_File_Control_Block,
|
|
Mode => To_FCB (Mode),
|
|
Name => Name,
|
|
Form => Form,
|
|
Amethod => 'W',
|
|
Creat => False,
|
|
Text => True);
|
|
|
|
File.Self := File;
|
|
Set_WCEM (File);
|
|
end Open;
|
|
|
|
----------
|
|
-- Page --
|
|
----------
|
|
|
|
-- Note: we assume that it is impossible in practice for the page
|
|
-- to exceed the value of Count'Last, i.e. no check is required for
|
|
-- overflow raising layout error.
|
|
|
|
function Page (File : File_Type) return Positive_Count is
|
|
begin
|
|
FIO.Check_File_Open (AP (File));
|
|
return File.Page;
|
|
end Page;
|
|
|
|
function Page return Positive_Count is
|
|
begin
|
|
return Page (Current_Out);
|
|
end Page;
|
|
|
|
-----------------
|
|
-- Page_Length --
|
|
-----------------
|
|
|
|
function Page_Length (File : File_Type) return Count is
|
|
begin
|
|
FIO.Check_Write_Status (AP (File));
|
|
return File.Page_Length;
|
|
end Page_Length;
|
|
|
|
function Page_Length return Count is
|
|
begin
|
|
return Page_Length (Current_Out);
|
|
end Page_Length;
|
|
|
|
---------
|
|
-- Put --
|
|
---------
|
|
|
|
procedure Put
|
|
(File : File_Type;
|
|
Item : Wide_Character)
|
|
is
|
|
wide_text_translation_required : Integer;
|
|
pragma Import
|
|
(C, wide_text_translation_required,
|
|
"__gnat_wide_text_translation_required");
|
|
-- Text translation is required on Windows only. This means that the
|
|
-- console is doing translation and we do not want to do any encoding
|
|
-- here. If this variable is not 0 we output the character via fputwc.
|
|
|
|
procedure Out_Char (C : Character);
|
|
-- Procedure to output one character of a wide character 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;
|
|
|
|
Discard : int;
|
|
|
|
-- Start of processing for Put
|
|
|
|
begin
|
|
FIO.Check_Write_Status (AP (File));
|
|
|
|
if wide_text_translation_required /= 0
|
|
or else File.Text_Encoding in Non_Default_Text_Content_Encoding
|
|
then
|
|
set_mode (fileno (File.Stream), File.Text_Encoding);
|
|
Discard := fputwc (Wide_Character'Pos (Item), File.Stream);
|
|
else
|
|
WC_Out (Item, File.WC_Method);
|
|
end if;
|
|
|
|
File.Col := File.Col + 1;
|
|
end Put;
|
|
|
|
procedure Put (Item : Wide_Character) is
|
|
begin
|
|
Put (Current_Out, Item);
|
|
end Put;
|
|
|
|
---------
|
|
-- Put --
|
|
---------
|
|
|
|
procedure Put
|
|
(File : File_Type;
|
|
Item : Wide_String)
|
|
is
|
|
begin
|
|
for J in Item'Range loop
|
|
Put (File, Item (J));
|
|
end loop;
|
|
end Put;
|
|
|
|
procedure Put (Item : Wide_String) is
|
|
begin
|
|
Put (Current_Out, Item);
|
|
end Put;
|
|
|
|
--------------
|
|
-- Put_Line --
|
|
--------------
|
|
|
|
procedure Put_Line
|
|
(File : File_Type;
|
|
Item : Wide_String)
|
|
is
|
|
begin
|
|
Put (File, Item);
|
|
New_Line (File);
|
|
end Put_Line;
|
|
|
|
procedure Put_Line (Item : Wide_String) is
|
|
begin
|
|
Put (Current_Out, Item);
|
|
New_Line (Current_Out);
|
|
end Put_Line;
|
|
|
|
----------
|
|
-- Putc --
|
|
----------
|
|
|
|
procedure Putc (ch : int; File : File_Type) is
|
|
begin
|
|
if fputc (ch, File.Stream) = EOF then
|
|
raise Device_Error;
|
|
end if;
|
|
end Putc;
|
|
|
|
----------
|
|
-- Read --
|
|
----------
|
|
|
|
-- This is the primitive Stream Read routine, used when a Text_IO file
|
|
-- is treated directly as a stream using Text_IO.Streams.Stream.
|
|
|
|
procedure Read
|
|
(File : in out Wide_Text_AFCB;
|
|
Item : out Stream_Element_Array;
|
|
Last : out Stream_Element_Offset)
|
|
is
|
|
Discard_ch : int;
|
|
pragma Unreferenced (Discard_ch);
|
|
|
|
begin
|
|
-- Need to deal with Before_Wide_Character ???
|
|
|
|
if File.Mode /= FCB.In_File then
|
|
raise Mode_Error;
|
|
end if;
|
|
|
|
-- Deal with case where our logical and physical position do not match
|
|
-- because of being after an LM or LM-PM sequence when in fact we are
|
|
-- logically positioned before it.
|
|
|
|
if File.Before_LM then
|
|
|
|
-- If we are before a PM, then it is possible for a stream read
|
|
-- to leave us after the LM and before the PM, which is a bit
|
|
-- odd. The easiest way to deal with this is to unget the PM,
|
|
-- so we are indeed positioned between the characters. This way
|
|
-- further stream read operations will work correctly, and the
|
|
-- effect on text processing is a little weird, but what can
|
|
-- be expected if stream and text input are mixed this way?
|
|
|
|
if File.Before_LM_PM then
|
|
Discard_ch := ungetc (PM, File.Stream);
|
|
File.Before_LM_PM := False;
|
|
end if;
|
|
|
|
File.Before_LM := False;
|
|
|
|
Item (Item'First) := Stream_Element (Character'Pos (ASCII.LF));
|
|
|
|
if Item'Length = 1 then
|
|
Last := Item'Last;
|
|
|
|
else
|
|
Last :=
|
|
Item'First +
|
|
Stream_Element_Offset
|
|
(fread (buffer => Item'Address,
|
|
index => size_t (Item'First + 1),
|
|
size => 1,
|
|
count => Item'Length - 1,
|
|
stream => File.Stream));
|
|
end if;
|
|
|
|
return;
|
|
end if;
|
|
|
|
-- Now we do the read. Since this is a text file, it is normally in
|
|
-- text mode, but stream data must be read in binary mode, so we
|
|
-- temporarily set binary mode for the read, resetting it after.
|
|
-- These calls have no effect in a system (like Unix) where there is
|
|
-- no distinction between text and binary files.
|
|
|
|
set_binary_mode (fileno (File.Stream));
|
|
|
|
Last :=
|
|
Item'First +
|
|
Stream_Element_Offset
|
|
(fread (Item'Address, 1, Item'Length, File.Stream)) - 1;
|
|
|
|
if Last < Item'Last then
|
|
if ferror (File.Stream) /= 0 then
|
|
raise Device_Error;
|
|
end if;
|
|
end if;
|
|
|
|
set_text_mode (fileno (File.Stream));
|
|
end Read;
|
|
|
|
-----------
|
|
-- Reset --
|
|
-----------
|
|
|
|
procedure Reset
|
|
(File : in out File_Type;
|
|
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
|
|
File = Current_Error)
|
|
and then To_FCB (Mode) /= File.Mode
|
|
then
|
|
raise Mode_Error;
|
|
end if;
|
|
|
|
Terminate_Line (File);
|
|
FIO.Reset (AP (File)'Unrestricted_Access, To_FCB (Mode));
|
|
File.Page := 1;
|
|
File.Line := 1;
|
|
File.Col := 1;
|
|
File.Line_Length := 0;
|
|
File.Page_Length := 0;
|
|
File.Before_LM := False;
|
|
File.Before_LM_PM := False;
|
|
end Reset;
|
|
|
|
procedure Reset (File : in out File_Type) is
|
|
begin
|
|
Terminate_Line (File);
|
|
FIO.Reset (AP (File)'Unrestricted_Access);
|
|
File.Page := 1;
|
|
File.Line := 1;
|
|
File.Col := 1;
|
|
File.Line_Length := 0;
|
|
File.Page_Length := 0;
|
|
File.Before_LM := False;
|
|
File.Before_LM_PM := False;
|
|
end Reset;
|
|
|
|
-------------
|
|
-- Set_Col --
|
|
-------------
|
|
|
|
procedure Set_Col
|
|
(File : File_Type;
|
|
To : Positive_Count)
|
|
is
|
|
ch : int;
|
|
|
|
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 not To'Valid then
|
|
raise Constraint_Error;
|
|
end if;
|
|
|
|
FIO.Check_File_Open (AP (File));
|
|
|
|
if To = File.Col then
|
|
return;
|
|
end if;
|
|
|
|
if Mode (File) >= Out_File then
|
|
if File.Line_Length /= 0 and then To > File.Line_Length then
|
|
raise Layout_Error;
|
|
end if;
|
|
|
|
if To < File.Col then
|
|
New_Line (File);
|
|
end if;
|
|
|
|
while File.Col < To loop
|
|
Put (File, ' ');
|
|
end loop;
|
|
|
|
else
|
|
loop
|
|
ch := Getc (File);
|
|
|
|
if ch = EOF then
|
|
raise End_Error;
|
|
|
|
elsif ch = LM then
|
|
File.Line := File.Line + 1;
|
|
File.Col := 1;
|
|
|
|
elsif ch = PM and then File.Is_Regular_File then
|
|
File.Page := File.Page + 1;
|
|
File.Line := 1;
|
|
File.Col := 1;
|
|
|
|
elsif To = File.Col then
|
|
Ungetc (ch, File);
|
|
return;
|
|
|
|
else
|
|
File.Col := File.Col + 1;
|
|
end if;
|
|
end loop;
|
|
end if;
|
|
end Set_Col;
|
|
|
|
procedure Set_Col (To : Positive_Count) is
|
|
begin
|
|
Set_Col (Current_Out, To);
|
|
end Set_Col;
|
|
|
|
---------------
|
|
-- Set_Error --
|
|
---------------
|
|
|
|
procedure Set_Error (File : File_Type) is
|
|
begin
|
|
FIO.Check_Write_Status (AP (File));
|
|
Current_Err := File;
|
|
end Set_Error;
|
|
|
|
---------------
|
|
-- Set_Input --
|
|
---------------
|
|
|
|
procedure Set_Input (File : File_Type) is
|
|
begin
|
|
FIO.Check_Read_Status (AP (File));
|
|
Current_In := File;
|
|
end Set_Input;
|
|
|
|
--------------
|
|
-- Set_Line --
|
|
--------------
|
|
|
|
procedure Set_Line
|
|
(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 not To'Valid then
|
|
raise Constraint_Error;
|
|
end if;
|
|
|
|
FIO.Check_File_Open (AP (File));
|
|
|
|
if To = File.Line then
|
|
return;
|
|
end if;
|
|
|
|
if Mode (File) >= Out_File then
|
|
if File.Page_Length /= 0 and then To > File.Page_Length then
|
|
raise Layout_Error;
|
|
end if;
|
|
|
|
if To < File.Line then
|
|
New_Page (File);
|
|
end if;
|
|
|
|
while File.Line < To loop
|
|
New_Line (File);
|
|
end loop;
|
|
|
|
else
|
|
while To /= File.Line loop
|
|
Skip_Line (File);
|
|
end loop;
|
|
end if;
|
|
end Set_Line;
|
|
|
|
procedure Set_Line (To : Positive_Count) is
|
|
begin
|
|
Set_Line (Current_Out, To);
|
|
end Set_Line;
|
|
|
|
---------------------
|
|
-- Set_Line_Length --
|
|
---------------------
|
|
|
|
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 not To'Valid then
|
|
raise Constraint_Error;
|
|
end if;
|
|
|
|
FIO.Check_Write_Status (AP (File));
|
|
File.Line_Length := To;
|
|
end Set_Line_Length;
|
|
|
|
procedure Set_Line_Length (To : Count) is
|
|
begin
|
|
Set_Line_Length (Current_Out, To);
|
|
end Set_Line_Length;
|
|
|
|
----------------
|
|
-- Set_Output --
|
|
----------------
|
|
|
|
procedure Set_Output (File : File_Type) is
|
|
begin
|
|
FIO.Check_Write_Status (AP (File));
|
|
Current_Out := File;
|
|
end Set_Output;
|
|
|
|
---------------------
|
|
-- Set_Page_Length --
|
|
---------------------
|
|
|
|
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 not To'Valid then
|
|
raise Constraint_Error;
|
|
end if;
|
|
|
|
FIO.Check_Write_Status (AP (File));
|
|
File.Page_Length := To;
|
|
end Set_Page_Length;
|
|
|
|
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 : File_Type;
|
|
Spacing : Positive_Count := 1)
|
|
is
|
|
ch : int;
|
|
|
|
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 not Spacing'Valid then
|
|
raise Constraint_Error;
|
|
end if;
|
|
|
|
FIO.Check_Read_Status (AP (File));
|
|
|
|
for L in 1 .. Spacing loop
|
|
if File.Before_LM then
|
|
File.Before_LM := False;
|
|
File.Before_LM_PM := False;
|
|
|
|
else
|
|
ch := Getc (File);
|
|
|
|
-- If at end of file now, then immediately raise End_Error. Note
|
|
-- that we can never be positioned between a line mark and a page
|
|
-- mark, so if we are at the end of file, we cannot logically be
|
|
-- before the implicit page mark that is at the end of the file.
|
|
|
|
-- For the same reason, we do not need an explicit check for a
|
|
-- page mark. If there is a FF in the middle of a line, the file
|
|
-- is not in canonical format and we do not care about the page
|
|
-- numbers for files other than ones in canonical format.
|
|
|
|
if ch = EOF then
|
|
raise End_Error;
|
|
end if;
|
|
|
|
-- If not at end of file, then loop till we get to an LM or EOF.
|
|
-- The latter case happens only in non-canonical files where the
|
|
-- last line is not terminated by LM, but we don't want to blow
|
|
-- up for such files, so we assume an implicit LM in this case.
|
|
|
|
loop
|
|
exit when ch = LM or else ch = EOF;
|
|
ch := Getc (File);
|
|
end loop;
|
|
end if;
|
|
|
|
-- We have got past a line mark, now, for a regular file only,
|
|
-- see if a page mark immediately follows this line mark and
|
|
-- if so, skip past the page mark as well. We do not do this
|
|
-- for non-regular files, since it would cause an undesirable
|
|
-- wait for an additional character.
|
|
|
|
File.Col := 1;
|
|
File.Line := File.Line + 1;
|
|
|
|
if File.Before_LM_PM then
|
|
File.Page := File.Page + 1;
|
|
File.Line := 1;
|
|
File.Before_LM_PM := False;
|
|
|
|
elsif File.Is_Regular_File then
|
|
ch := Getc (File);
|
|
|
|
-- Page mark can be explicit, or implied at the end of the file
|
|
|
|
if (ch = PM or else ch = EOF)
|
|
and then File.Is_Regular_File
|
|
then
|
|
File.Page := File.Page + 1;
|
|
File.Line := 1;
|
|
else
|
|
Ungetc (ch, File);
|
|
end if;
|
|
end if;
|
|
end loop;
|
|
|
|
File.Before_Wide_Character := False;
|
|
end Skip_Line;
|
|
|
|
procedure Skip_Line (Spacing : Positive_Count := 1) is
|
|
begin
|
|
Skip_Line (Current_In, Spacing);
|
|
end Skip_Line;
|
|
|
|
---------------
|
|
-- Skip_Page --
|
|
---------------
|
|
|
|
procedure Skip_Page (File : File_Type) is
|
|
ch : int;
|
|
|
|
begin
|
|
FIO.Check_Read_Status (AP (File));
|
|
|
|
-- If at page mark already, just skip it
|
|
|
|
if File.Before_LM_PM then
|
|
File.Before_LM := False;
|
|
File.Before_LM_PM := False;
|
|
File.Page := File.Page + 1;
|
|
File.Line := 1;
|
|
File.Col := 1;
|
|
return;
|
|
end if;
|
|
|
|
-- This is a bit tricky, if we are logically before an LM then
|
|
-- it is not an error if we are at an end of file now, since we
|
|
-- are not really at it.
|
|
|
|
if File.Before_LM then
|
|
File.Before_LM := False;
|
|
File.Before_LM_PM := False;
|
|
ch := Getc (File);
|
|
|
|
-- Otherwise we do raise End_Error if we are at the end of file now
|
|
|
|
else
|
|
ch := Getc (File);
|
|
|
|
if ch = EOF then
|
|
raise End_Error;
|
|
end if;
|
|
end if;
|
|
|
|
-- Now we can just rumble along to the next page mark, or to the
|
|
-- end of file, if that comes first. The latter case happens when
|
|
-- the page mark is implied at the end of file.
|
|
|
|
loop
|
|
exit when ch = EOF
|
|
or else (ch = PM and then File.Is_Regular_File);
|
|
ch := Getc (File);
|
|
end loop;
|
|
|
|
File.Page := File.Page + 1;
|
|
File.Line := 1;
|
|
File.Col := 1;
|
|
File.Before_Wide_Character := False;
|
|
end Skip_Page;
|
|
|
|
procedure Skip_Page is
|
|
begin
|
|
Skip_Page (Current_In);
|
|
end Skip_Page;
|
|
|
|
--------------------
|
|
-- Standard_Error --
|
|
--------------------
|
|
|
|
function Standard_Error return File_Type is
|
|
begin
|
|
return Standard_Err;
|
|
end Standard_Error;
|
|
|
|
function Standard_Error return File_Access is
|
|
begin
|
|
return Standard_Err'Access;
|
|
end Standard_Error;
|
|
|
|
--------------------
|
|
-- Standard_Input --
|
|
--------------------
|
|
|
|
function Standard_Input return File_Type is
|
|
begin
|
|
return Standard_In;
|
|
end Standard_Input;
|
|
|
|
function Standard_Input return File_Access is
|
|
begin
|
|
return Standard_In'Access;
|
|
end Standard_Input;
|
|
|
|
---------------------
|
|
-- Standard_Output --
|
|
---------------------
|
|
|
|
function Standard_Output return File_Type is
|
|
begin
|
|
return Standard_Out;
|
|
end Standard_Output;
|
|
|
|
function Standard_Output return File_Access is
|
|
begin
|
|
return Standard_Out'Access;
|
|
end Standard_Output;
|
|
|
|
--------------------
|
|
-- Terminate_Line --
|
|
--------------------
|
|
|
|
procedure Terminate_Line (File : File_Type) is
|
|
begin
|
|
FIO.Check_File_Open (AP (File));
|
|
|
|
-- For file other than In_File, test for needing to terminate last line
|
|
|
|
if Mode (File) /= In_File then
|
|
|
|
-- If not at start of line definition need new line
|
|
|
|
if File.Col /= 1 then
|
|
New_Line (File);
|
|
|
|
-- For files other than standard error and standard output, we
|
|
-- make sure that an empty file has a single line feed, so that
|
|
-- it is properly formatted. We avoid this for the standard files
|
|
-- because it is too much of a nuisance to have these odd line
|
|
-- feeds when nothing has been written to the file.
|
|
|
|
elsif (File /= Standard_Err and then File /= Standard_Out)
|
|
and then (File.Line = 1 and then File.Page = 1)
|
|
then
|
|
New_Line (File);
|
|
end if;
|
|
end if;
|
|
end Terminate_Line;
|
|
|
|
------------
|
|
-- Ungetc --
|
|
------------
|
|
|
|
procedure Ungetc (ch : int; File : File_Type) is
|
|
begin
|
|
if ch /= EOF then
|
|
if ungetc (ch, File.Stream) = EOF then
|
|
raise Device_Error;
|
|
end if;
|
|
end if;
|
|
end Ungetc;
|
|
|
|
-----------
|
|
-- Write --
|
|
-----------
|
|
|
|
-- This is the primitive Stream Write routine, used when a Text_IO file
|
|
-- is treated directly as a stream using Text_IO.Streams.Stream.
|
|
|
|
procedure Write
|
|
(File : in out Wide_Text_AFCB;
|
|
Item : Stream_Element_Array)
|
|
is
|
|
pragma Warnings (Off, File);
|
|
-- Because in this implementation we don't need IN OUT, we only read
|
|
|
|
Siz : constant size_t := Item'Length;
|
|
|
|
begin
|
|
if File.Mode = FCB.In_File then
|
|
raise Mode_Error;
|
|
end if;
|
|
|
|
-- Now we do the write. Since this is a text file, it is normally in
|
|
-- text mode, but stream data must be written in binary mode, so we
|
|
-- temporarily set binary mode for the write, resetting it after.
|
|
-- These calls have no effect in a system (like Unix) where there is
|
|
-- no distinction between text and binary files.
|
|
|
|
set_binary_mode (fileno (File.Stream));
|
|
|
|
if fwrite (Item'Address, 1, Siz, File.Stream) /= Siz then
|
|
raise Device_Error;
|
|
end if;
|
|
|
|
set_text_mode (fileno (File.Stream));
|
|
end Write;
|
|
|
|
begin
|
|
-- Initialize Standard Files
|
|
|
|
for J in WC_Encoding_Method loop
|
|
if WC_Encoding = WC_Encoding_Letters (J) then
|
|
Default_WCEM := J;
|
|
end if;
|
|
end loop;
|
|
|
|
Initialize_Standard_Files;
|
|
|
|
FIO.Chain_File (AP (Standard_In));
|
|
FIO.Chain_File (AP (Standard_Out));
|
|
FIO.Chain_File (AP (Standard_Err));
|
|
|
|
end Ada.Wide_Text_IO;
|