------------------------------------------------------------------------------
--                                                                          --
--                           POLYORB COMPONENTS                             --
--                                                                          --
--                           T I M E _ U T I L S                            --
--                                                                          --
--                                 B o d y                                  --
--                                                                          --
--         Copyright (C) 2001-2012, Free Software Foundation, Inc.          --
--                                                                          --
-- This 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 3,  or (at your option) any later ver- --
-- sion.  This software is distributed in the hope  that it will be useful, --
-- but WITHOUT ANY WARRANTY;  without even the implied warranty of MERCHAN- --
-- TABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public --
-- License for  more details.                                               --
--                                                                          --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception,   --
-- version 3.1, as published by the Free Software Foundation.               --
--                                                                          --
-- You should have received a copy of the GNU General Public License and    --
-- a copy of the GCC Runtime Library Exception along with this program;     --
-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
-- <http://www.gnu.org/licenses/>.                                          --
--                                                                          --
--                  PolyORB is maintained by AdaCore                        --
--                     (email: sales@adacore.com)                           --
--                                                                          --
------------------------------------------------------------------------------

with Interfaces.C;
with System;

package body Time_Utils is

   use TimeBase;

   Time_Offset : constant TimeT := 141_427 * 86_400 * 10_000_000;
   --  Time offset between 15 october 1582 and 1 january 1970.

   ---------
   -- "+" --
   ---------

   function "+" (A : TimeBase.TimeT; B : TimeBase.InaccuracyT)
     return TimeBase.TimeT is
   begin
      return A + TimeBase.TimeT (B);
   end "+";

   ---------
   -- "-" --
   ---------

   function "-" (A : TimeBase.TimeT; B : TimeBase.InaccuracyT)
     return TimeBase.TimeT is
   begin
      return A - TimeBase.TimeT (B);
   end "-";

   ---------
   -- "+" --
   ---------

   function "+" (A : TimeBase.TimeT; B : TimeBase.TdfT)
     return TimeBase.TimeT is
   begin
      return A + TimeBase.TimeT (B) * 600_000_000;
   end "+";

   ---------
   -- "-" --
   ---------

   function "-" (A : TimeBase.TimeT; B : TimeBase.TdfT)
     return TimeBase.TimeT is
   begin
      return A + (-B);
   end "-";

   -------------
   -- Compare --
   -------------

   function Compare (A : TimeBase.TimeT; B : TimeBase.TimeT)
     return CosTime.TimeComparison
   is
      use CosTime;
   begin
      if A < B then
         return TCLessThan;
      elsif A = B then
         return TCEqualTo;
      else
         return TCGreaterThan;
      end if;
   end Compare;

   ------------------
   -- Current_Time --
   ------------------

   function Current_Time return TimeBase.TimeT is
      function Unix_Time (TLOC : System.Address := System.Null_Address)
                         return Interfaces.C.long;
      pragma Import (C, Unix_Time, "__gnat_time");
   begin
      return TimeBase.TimeT (Unix_Time) * 10_000_000 + Time_Offset;
   end Current_Time;

   function Current_Inaccuracy return TimeBase.InaccuracyT is
   begin
      --  Time on Unix has 1 second of precision
      return 10_000_000;
   end Current_Inaccuracy;

   -----------------
   -- Current_Tdf --
   -----------------

   function Current_Tdf return TimeBase.TdfT is
   begin
      --  Return UTC
      return 0;
   end Current_Tdf;

end Time_Utils;
