gettimeofday_vs.cc

#include "gettimeofday_vs.h"

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

#ifndef _PLATFORM_LIB_AVAILABLE
// In case of Couchbase Server Builds, platform library
// is included, which already contains the following
// definition.
int gettimeofday_vs(struct timeval *tv, void *_tz)
{
    FILETIME ft;
    unsigned __int64 tmpres = 0;
    static int tzflag;
    struct timezone *tz = (struct timezone *)_tz;

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

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

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

    if (NULL != tz) {
        if (!tzflag) {
            _tzset();
            tzflag++;
        }
        tz->tz_minuteswest = _timezone / 60;
        tz->tz_dsttime = _daylight;
    }

    return 0;
}
#endif // _PLATFORM_LIB_AVAILABLE