gettimeofday.cpp

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/*
 *  Original work: Copyright (c) 2014, Oculus VR, Inc.
 *  All rights reserved.
 *
 *  This source code is licensed under the BSD-style license found in the
 *  RakNet License.txt file in the licenses directory of this source tree. An additional grant 
 *  of patent rights can be found in the RakNet Patents.txt file in the same directory.
 *
 *
 *  Modified work: Copyright (c) 2016-2017, SLikeSoft UG (haftungsbeschränkt)
 *
 *  This source code was modified by SLikeSoft. Modifications are licensed under the MIT-style
 *  license found in the license.txt file in the root directory of this source tree.
 */

#if defined(_WIN32) && !defined(__GNUC__)  &&!defined(__GCCXML__)

#include "slikenet/gettimeofday.h"

// From http://www.openasthra.com/c-tidbits/gettimeofday-function-for-windows/

#include "slikenet/WindowsIncludes.h"

#if defined(_MSC_VER) || defined(_MSC_EXTENSIONS)
  #define DELTA_EPOCH_IN_MICROSECS  11644473600000000Ui64
#else
  #define DELTA_EPOCH_IN_MICROSECS  11644473600000000ULL
#endif

int gettimeofday(struct timeval *tv, struct timezone *tz)
{
#if defined(WINDOWS_PHONE_8) || defined(WINDOWS_STORE_RT)
    // _tzset not supported
    (void) tv;
    (void) tz;
#else

  FILETIME ft;
  unsigned __int64 tmpres = 0;
  static int tzflag;

  if (NULL != tv)
  {
    GetSystemTimeAsFileTime(&ft);

    tmpres |= ft.dwHighDateTime;
    tmpres <<= 32;
    tmpres |= ft.dwLowDateTime;

    /*converting file time to unix epoch*/
    tmpres /= 10;  /*convert into microseconds*/
    tmpres -= DELTA_EPOCH_IN_MICROSECS;
    tv->tv_sec = (long)(tmpres / 1000000UL);
    tv->tv_usec = (long)(tmpres % 1000000UL);
  }

  if (NULL != tz)
  {
    if (!tzflag)
    {
      _tzset();
      tzflag++;
    }
    long seconds;
    _get_timezone(&seconds);
    tz->tz_minuteswest = seconds / 60;
    _get_daylight(&(tz->tz_dsttime));
  }

#endif

  return 0;
}

#endif