/* $Id: timer.h 767 2004-10-06 12:48:49Z aturner $ */

/*
 * Copyright (c) 2001-2004 Aaron Turner, Matt Bing.
 * 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.
 * 3. Neither the names of the copyright owners nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``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 AUTHORS OR COPYRIGHT HOLDERS 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.
 */

#ifndef _TIMER_H_
#define _TIMER_H_

#include <time.h>
#include <sys/time.h>
#include <math.h>

inline void timerdiv(struct timeval *tvp, float div);
inline void float2timer(float time, struct timeval *tvp);

#ifndef TIMEVAL_TO_TIMESPEC
#define TIMEVAL_TO_TIMESPEC(tv, ts) { (ts)->tv_sec = (tv)->tv_sec; (ts)->tv_nsec = (tv)->tv_usec * 1000; }
#endif

#ifndef timerclear
#define timerclear(tvp)		(tvp)->tv_sec = (tvp)->tv_usec = 0
#endif

#ifndef timerisset
#define timerisset(tvp)		((tvp)->tv_sec || (tvp)->tv_usec)
#endif

#ifndef timeradd
#define timeradd(tvp, uvp, vvp)                     \
	do {                                \
		(vvp)->tv_sec = (tvp)->tv_sec + (uvp)->tv_sec;      \
		(vvp)->tv_usec = (tvp)->tv_usec + (uvp)->tv_usec;   \
		if ((vvp)->tv_usec >= 1000000) {            \
			(vvp)->tv_sec++;                \
			(vvp)->tv_usec -= 1000000;          \
		}                           \
	} while (0)
#endif

#ifndef timersub
#define	timersub(tvp, uvp, vvp)						\
	do {								\
		(vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec;		\
		(vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec;	\
		if ((vvp)->tv_usec < 0) {				\
			(vvp)->tv_sec--;				\
			(vvp)->tv_usec += 1000000;			\
		}							\
	} while (0)
#endif

#ifndef timercmp
#define timercmp(tvp, uvp, cmp)				\
	(((tvp)->tv_sec == (uvp)->tv_sec) ?		\
	((tvp)->tv_usec cmp (uvp)->tv_usec) :		\
	((tvp)->tv_sec cmp (uvp)->tv_sec))
#endif

#define timermul(tvp, uvp, x)						\
	do {								\
		(uvp)->tv_sec = (tvp)->tv_sec * x;			\
		(uvp)->tv_usec = (tvp)->tv_usec * x;			\
		while((uvp)->tv_usec > 1000000) {			\
			(uvp)->tv_sec++;				\
			(uvp)->tv_usec -= 1000000;			\
		}							\
	} while(0)


#define timerdiv2(tvp, x)						\
	do {								\
		(tvp)->tv_sec = (tvp)->tv_sec / x;			\
		(tvp)->tv_usec = (tvp)->tv_usec / x;			\
	} while(0)

#endif