/*
 * Copyright (C) 2005-2010 Andre Noll <maan@tuebingen.mpg.de>
 *
 * Licensed under the GPL v2. For licencing details see COPYING.
 */

#include <sys/time.h>
#include <time.h>
#include <inttypes.h>
#include <assert.h>
#include <string.h>

#include "gcc-compat.h"
#include "err.h"
#include "str.h"
#include "log.h"
#include "time.h"

/**
 * Compute the difference of two time values.
 *
 * \param b Minuend.
 * \param a Subtrahend.
 * \param diff Result pointer.
 *
 * If \a diff is not \p NULL, it contains the absolute value |\a b - \a a| on
 * return.
 *
 * \return If \a b < \a a, this function returns -1, otherwise it returns 1.
 */
int tv_diff(const struct timeval *b, const struct timeval *a, struct timeval *diff)
{
	int ret = 1;

	if ((b->tv_sec < a->tv_sec) ||
		((b->tv_sec == a->tv_sec) && (b->tv_usec < a->tv_usec))) {
		const struct timeval *tmp = a;
		a = b;
		b = tmp;
		ret = -1;
	}
	if (!diff)
		return ret;
	diff->tv_sec = b->tv_sec - a->tv_sec;
	if (b->tv_usec < a->tv_usec) {
		diff->tv_sec--;
		diff->tv_usec = 1000 * 1000 - a->tv_usec + b->tv_usec;
	} else
		diff->tv_usec = b->tv_usec - a->tv_usec;
	return ret;
}

int64_t get_current_time(void)
{
	time_t now;
	time(&now);
	DSS_DEBUG_LOG(("now: %jd\n", (intmax_t)now));
	return (int64_t)now;
}