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1 281 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT RUN-TIME COMPONENTS                         --
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--                                                                          --
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--                          G N A T . I O _ A U X                           --
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--                                                                          --
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--                                 B o d y                                  --
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--                                                                          --
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--                     Copyright (C) 1995-2005, AdaCore                     --
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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 2,  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.  See the GNU General Public License --
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-- for  more details.  You should have  received  a copy of the GNU General --
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-- Public License  distributed with GNAT;  see file COPYING.  If not, write --
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-- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
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-- Boston, MA 02110-1301, USA.                                              --
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--                                                                          --
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-- As a special exception,  if other files  instantiate  generics from this --
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-- unit, or you link  this unit with other files  to produce an executable, --
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-- this  unit  does not  by itself cause  the resulting  executable  to  be --
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-- covered  by the  GNU  General  Public  License.  This exception does not --
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-- however invalidate  any other reasons why  the executable file  might be --
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-- covered by the  GNU Public License.                                      --
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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 Interfaces.C_Streams; use Interfaces.C_Streams;
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package body GNAT.IO_Aux is
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   Buflen : constant := 2000;
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   --  Buffer length. Works for any non-zero value, larger values take
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   --  more stack space, smaller values require more recursion.
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   -----------------
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   -- File_Exists --
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   -----------------
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   function File_Exists (Name : String) return Boolean
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   is
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      Namestr : aliased String (1 .. Name'Length + 1);
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      --  Name as given with ASCII.NUL appended
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   begin
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      Namestr (1 .. Name'Length) := Name;
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      Namestr (Name'Length + 1)  := ASCII.NUL;
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      return file_exists (Namestr'Address) /= 0;
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   end File_Exists;
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   --------------
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   -- Get_Line --
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   --------------
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   --  Current_Input case
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   function Get_Line return String is
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      Buffer : String (1 .. Buflen);
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      --  Buffer to read in chunks of remaining line. Will work with any
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      --  size buffer. We choose a length so that most of the time no
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      --  recursion will be required.
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      Last : Natural;
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   begin
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      Ada.Text_IO.Get_Line (Buffer, Last);
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      --  If the buffer is not full, then we are all done
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      if Last < Buffer'Last then
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         return Buffer (1 .. Last);
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      --  Otherwise, we still have characters left on the line. Note that
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      --  as specified by (RM A.10.7(19)) the end of line is not skipped
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      --  in this case, even if we are right at it now.
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      else
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         return Buffer & GNAT.IO_Aux.Get_Line;
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      end if;
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   end Get_Line;
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   --  Case of reading from a specified file. Note that we could certainly
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   --  share code between these two versions, but these are very short
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   --  routines, and we may as well aim for maximum speed, cutting out an
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   --  intermediate call (calls returning string may be somewhat slow)
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   function Get_Line (File : Ada.Text_IO.File_Type) return String is
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      Buffer : String (1 .. Buflen);
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      Last   : Natural;
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   begin
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      Ada.Text_IO.Get_Line (File, Buffer, Last);
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      if Last < Buffer'Last then
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         return Buffer (1 .. Last);
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      else
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         return Buffer & Get_Line (File);
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      end if;
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   end Get_Line;
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end GNAT.IO_Aux;

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