home *** CD-ROM | disk | FTP | other *** search
- ------------------------------------------------------------------------------
- -- --
- -- GNAT RUNTIME COMPONENTS --
- -- --
- -- G N A T . I O _ A U X --
- -- --
- -- B o d y --
- -- --
- -- $Revision: 1.2 $ --
- -- --
- -- Copyright (C) 1995 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. --
- -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
- -- --
- ------------------------------------------------------------------------------
-
- 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.
-
- --------------
- -- 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 : in 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;
-