//%2006////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2000, 2001, 2002 BMC Software; Hewlett-Packard Development
// Company, L.P.; IBM Corp.; The Open Group; Tivoli Systems.
// Copyright (c) 2003 BMC Software; Hewlett-Packard Development Company, L.P.;
// IBM Corp.; EMC Corporation, The Open Group.
// Copyright (c) 2004 BMC Software; Hewlett-Packard Development Company, L.P.;
// IBM Corp.; EMC Corporation; VERITAS Software Corporation; The Open Group.
// Copyright (c) 2005 Hewlett-Packard Development Company, L.P.; IBM Corp.;
// EMC Corporation; VERITAS Software Corporation; The Open Group.
// Copyright (c) 2006 Hewlett-Packard Development Company, L.P.; IBM Corp.;
// EMC Corporation; Symantec Corporation; The Open Group.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// THE ABOVE COPYRIGHT NOTICE AND THIS PERMISSION NOTICE SHALL BE INCLUDED IN
// ALL COPIES OR SUBSTANTIAL PORTIONS OF THE SOFTWARE. THE SOFTWARE IS PROVIDED
// "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
// LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
//==============================================================================
//
//%/////////////////////////////////////////////////////////////////////////////

#include "Time.h"

#if defined(PEGASUS_OS_TYPE_WINDOWS)
# include <windows.h>
# include <sys/timeb.h>
#else
# define USE_GETTIMEOFDAY
#endif

#if defined(USE_NTP_GETTIME)
# include <sys/timex.h>
# include <errno.h>
#endif

#if defined(USE_GETTIMEOFDAY)
# include <sys/time.h>
# include <errno.h>
#endif

PEGASUS_NAMESPACE_BEGIN

int Time::gettimeofday(timeval* tv)
{
#if defined(USE_GETTIMEOFDAY)

    if(tv == NULL)
        return EINVAL;

    struct timeval tmp;

    if (::gettimeofday(&tmp, NULL) == 0)
    {
        tv->tv_sec = tmp.tv_sec;
        tv->tv_usec = tmp.tv_usec;
        return 0;
    }

    return -1;

#elif defined(USE_NTP_GETTIME)

    if (tv == NULL)
        return EINVAL;

    struct ntptimeval ntp;

    if (ntp_gettime(&ntp) == 0)
    {
        tv->tv_sec = ntp.time.tv_sec;
        tv->tv_usec = ntp.time.tv_usec;
        return 0;
    }

    return -1;

#elif defined(PEGASUS_OS_TYPE_WINDOWS)

    struct _timeb timebuffer;

    if (tv == NULL)
        return -1;

    _ftime(&timebuffer);
    tv->tv_sec = long(timebuffer.time);
    tv->tv_usec = timebuffer.millitm * 1000;

    return 0;

#endif
}

int Time::subtract(timeval* result, timeval* x, timeval* y)
{
   /* Perform the carry for the later subtraction by updating Y. */
   if (x->tv_usec < y->tv_usec) {
      int nsec = (y->tv_usec - x->tv_usec) / 1000000 + 1;
      y->tv_usec -= 1000000 * nsec;
      y->tv_sec += nsec;
   }
   if (x->tv_usec - y->tv_usec > 1000000) {
      int nsec = (x->tv_usec - y->tv_usec) / 1000000;
      y->tv_usec += 1000000 * nsec;
      y->tv_sec -= nsec;
   }

   /* Compute the time remaining to wait.
      `tv_usec' is certainly positive. */
   result->tv_sec = x->tv_sec - y->tv_sec;
   result->tv_usec = x->tv_usec - y->tv_usec;

   /* Return 1 if result is negative. */
   return x->tv_sec < y->tv_sec;
}

PEGASUS_NAMESPACE_END