/*
** Copyright (C) 2000 by Kevin L. Mitchell <klmitch@mit.edu>
**
** 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 2 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, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
**
** @(#)$Id: timer_next.c,v 1.2 2000/12/10 15:00:20 klmitch Exp $
*/
#include "timer.h"
#include "timer_int.h"
#include "rcstag.h"

RCSTAG("@(#)$Id: timer_next.c,v 1.2 2000/12/10 15:00:20 klmitch Exp $");

_s_ul
timer_next(timer_val *next, int relative)
{
  _s_ul retval;
  timer_val time;

  if (!next) /* check arguments... */
    return TIMER_ERR_BADARGS;

  if (!timers) /* are there any timers at all? */
    return TIMER_ERR_EMPTY;

  if (relative) { /* requested a relative time... */
    if ((retval = timer_time(&time))) /* get current time */
      return retval;

    /* set the next time relative to now */
    next->t_sec = timers->call.t_sec - time.t_sec;
    next->t_nsec = timers->call.t_nsec - time.t_nsec;
  } else /* set the next time--absolute. */
    *next = timers->call; /* I love structure copy! */

  return 0;
}