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+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME COMPONENTS --
+-- --
+-- G N A T . I O _ A U X --
+-- --
+-- B o d y --
+-- --
+-- Copyright (C) 1995-2005, AdaCore --
+-- --
+-- 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, 51 Franklin Street, Fifth Floor, --
+-- Boston, MA 02110-1301, 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;