New Language: Ada

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@45955 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 108 insertions, 0 deletions

diff --git a/gcc/ada/g-io_aux.adb b/gcc/ada/g-io_aux.adb
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+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT RUNTIME COMPONENTS                          --
+--                                                                          --
+--                          G N A T . I O _ A U X                           --
+--                                                                          --
+--                                 B o d y                                  --
+--                                                                          --
+--                            $Revision: 1.7 $
+--                                                                          --
+--           Copyright (C) 1995-2000 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 is maintained by Ada Core Technologies Inc (http://www.gnat.com).   --
+--                                                                          --
+------------------------------------------------------------------------------
+
+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;