/* Convert double to timespec.

   Copyright (C) 2011-2017 Free Software Foundation, Inc.

   This program is free software: you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3 of the License, or

   (at your option) any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

/* written by Paul Eggert */

/* Convert the double value SEC to a struct timespec.  Round toward

   positive infinity.  On overflow, return an extremal value.  */

#include <config.h>

#include "timespec.h"

#include "intprops.h"

struct timespec

dtotimespec (double sec)

{

  if (! (TYPE_MINIMUM (time_t) < sec))

    return make_timespec (TYPE_MINIMUM (time_t), 0);

  else if (! (sec < 1.0 + TYPE_MAXIMUM (time_t)))

    return make_timespec (TYPE_MAXIMUM (time_t), TIMESPEC_RESOLUTION - 1);

  else

    {

      time_t s = sec;

      double frac = TIMESPEC_RESOLUTION * (sec - s);

      long ns = frac;

      ns += ns < frac;

      s += ns / TIMESPEC_RESOLUTION;

      ns %= TIMESPEC_RESOLUTION;

      if (ns < 0)

        {

          s--;

          ns += TIMESPEC_RESOLUTION;

        }

      return make_timespec (s, ns);

    }

}