/*

 * Copyright (c) 2014-2019 Sippy Software, Inc., http://www.sippysoft.com

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 */

#include <sys/time.h>

#include <assert.h>

#include <math.h>

#include <string.h>

#include "prdic_math.h"

#include "prdic_timespecops.h"

#include "prdic_pfd.h"

void

_prdic_PFD_init(struct _prdic_PFD *pfd_p)

{

    memset(pfd_p, '\0', sizeof(struct _prdic_PFD));

}

double

_prdic_PFD_get_error(struct _prdic_PFD *pfd_p, const struct timespec *tclk)

{

    double err0r;

    struct timespec next_tclk, ttclk;

    SEC(&next_tclk) = SEC(tclk) + 1;

    NSEC(&next_tclk) = 0;

    if (timespeciszero(&pfd_p->target_tclk)) {

        pfd_p->target_tclk = next_tclk;

        return (0.0);

    }

    timespecsub2(&ttclk, &pfd_p->target_tclk, tclk);

    err0r = timespec2dtime(&ttclk);

    pfd_p->target_tclk = next_tclk;

    if (err0r > 0) {

        SEC(&pfd_p->target_tclk) += 1;

    }

    return (err0r);

}

void

_prdic_PFD_reset(struct _prdic_PFD *pfd_p)

{

    SEC(&pfd_p->target_tclk) = 0;

    NSEC(&pfd_p->target_tclk) = 0;

}