------------------------------------------------------------------------------ -- -- -- GNAT RUNTIME COMPONENTS -- -- -- -- G N A T . I O _ A U X -- -- -- -- B o d y -- -- -- -- Copyright (C) 1995-2002 Ada Core Technologies, Inc. -- -- -- -- GNAT is free software; you can redistribute it and/or modify it under -- -- terms of the GNU General Public License as published by the Free Soft- -- -- ware Foundation; either version 2, or (at your option) any later ver- -- -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- -- for more details. You should have received a copy of the GNU General -- -- Public License distributed with GNAT; see file COPYING. If not, write -- -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, -- -- MA 02111-1307, USA. -- -- -- -- 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. -- -- -- -- GNAT was originally developed by the GNAT team at New York University. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- -- -- ------------------------------------------------------------------------------ with Interfaces.C_Streams; use Interfaces.C_Streams; package body GNAT.IO_Aux is Buflen : constant := 2000; -- Buffer length. Works for any non-zero value, larger values take -- more stack space, smaller values require more recursion. ----------------- -- File_Exists -- ----------------- function File_Exists (Name : String) return Boolean is Namestr : aliased String (1 .. Name'Length + 1); -- Name as given with ASCII.NUL appended begin Namestr (1 .. Name'Length) := Name; Namestr (Name'Length + 1) := ASCII.NUL; return file_exists (Namestr'Address) /= 0; end File_Exists; -------------- -- Get_Line -- -------------- -- Current_Input case function Get_Line return String is Buffer : String (1 .. Buflen); -- Buffer to read in chunks of remaining line. Will work with any -- size buffer. We choose a length so that most of the time no -- recursion will be required. Last : Natural; begin Ada.Text_IO.Get_Line (Buffer, Last); -- If the buffer is not full, then we are all done if Last < Buffer'Last then return Buffer (1 .. Last); -- Otherwise, we still have characters left on the line. Note that -- as specified by (RM A.10.7(19)) the end of line is not skipped -- in this case, even if we are right at it now. else return Buffer & GNAT.IO_Aux.Get_Line; end if; end Get_Line; -- Case of reading from a specified file. Note that we could certainly -- share code between these two versions, but these are very short -- routines, and we may as well aim for maximum speed, cutting out an -- intermediate call (calls returning string may be somewhat slow) function Get_Line (File : Ada.Text_IO.File_Type) return String is Buffer : String (1 .. Buflen); Last : Natural; begin Ada.Text_IO.Get_Line (File, Buffer, Last); if Last < Buffer'Last then return Buffer (1 .. Last); else return Buffer & Get_Line (File); end if; end Get_Line; end GNAT.IO_Aux;