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1 706 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) 1995-2010, 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 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 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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