Function calc_time_diff

sql/sql_time.cc:1266–1313

*/

bool
calc_time_diff(const MYSQL_TIME *l_time1, const MYSQL_TIME *l_time2,
               int l_sign, longlong *seconds_out, long *microseconds_out)
{
  long days;
  bool neg;
  longlong microseconds;

  /*
    We suppose that if first argument is MYSQL_TIMESTAMP_TIME
    the second argument should be TIMESTAMP_TIME also.
    We should check it before calc_time_diff call.
  */
  if (l_time1->time_type == MYSQL_TIMESTAMP_TIME)  // Time value
    days= (long)l_time1->day - l_sign * (long)l_time2->day;
  else
  {
    days= calc_daynr((uint) l_time1->year,
		     (uint) l_time1->month,
		     (uint) l_time1->day);
    if (l_time2->time_type == MYSQL_TIMESTAMP_TIME)
      days-= l_sign * (long)l_time2->day;
    else
      days-= l_sign*calc_daynr((uint) l_time2->year,
			       (uint) l_time2->month,
			       (uint) l_time2->day);
  }

  microseconds= ((longlong)days * SECONDS_IN_24H +
                 (longlong)(l_time1->hour*3600L +
                            l_time1->minute*60L +
                            l_time1->second) -
                 l_sign*(longlong)(l_time2->hour*3600L +
                                   l_time2->minute*60L +
                                   l_time2->second)) * LL(1000000) +
                (longlong)l_time1->second_part -
                l_sign*(longlong)l_time2->second_part;

  neg= 0;
  if (microseconds < 0)
  {
    microseconds= -microseconds;
    neg= 1;
  }
  *seconds_out= microseconds/1000000L;
  *microseconds_out= (long) (microseconds%1000000L);
  return neg;
}


/*