// $Id: KrTime.C,v 1.2 2001/08/05 03:48:50 ben Exp $

#include <Kr/KrTime.h>
#include <stdio.h>
#include <unistd.h>
#include <math.h>

KrTime::KrTime(double sec)
{
    double intsec = floor(sec);
    _tv.tv_sec = (int) intsec;
    _tv.tv_usec = (int) floor((sec - intsec) * 1000000.0);
}

KrTime
KrTime::now()
{
    KrTime time;
    ::gettimeofday(&time._tv, NULL);
    return time;
}

std::ostream&
operator << (std::ostream& ostr, const KrTime& t)
{
    char str[30];
    sprintf(str, "%ld.%06ld", t._tv.tv_sec, t._tv.tv_usec);
    return ostr << str;
}

//
// Comparison operators
//

bool
operator == (const KrTime& a, const KrTime& b)
{
    return a._tv.tv_sec == b._tv.tv_sec && a._tv.tv_usec == b._tv.tv_usec;
}

bool
operator != (const KrTime& a, const KrTime& b)
{
    return a._tv.tv_sec != b._tv.tv_sec || a._tv.tv_usec != b._tv.tv_usec;
}

bool
operator < (const KrTime& a, const KrTime& b)
{
    return a._tv.tv_sec == b._tv.tv_sec ?
	a._tv.tv_usec < b._tv.tv_usec : a._tv.tv_sec < b._tv.tv_sec;
}

bool
operator <= (const KrTime& a, const KrTime& b)
{
    return a._tv.tv_sec == b._tv.tv_sec ?
	a._tv.tv_usec <= b._tv.tv_usec : a._tv.tv_sec <= b._tv.tv_sec;
}

bool
operator > (const KrTime& a, const KrTime& b)
{
    return a._tv.tv_sec == b._tv.tv_sec ?
	a._tv.tv_usec > b._tv.tv_usec : a._tv.tv_sec > b._tv.tv_sec;
}

bool
operator >= (const KrTime& a, const KrTime& b)
{
    return a._tv.tv_sec == b._tv.tv_sec ?
	a._tv.tv_usec >= b._tv.tv_usec : a._tv.tv_sec >= b._tv.tv_sec;
}

//
// Arithmetic operators
//

KrTime
operator + (const KrTime& a, const KrTime& b)
{
    int usec = a._tv.tv_usec + b._tv.tv_usec;	
    return KrTime(a._tv.tv_sec + b._tv.tv_sec + usec / 1000000, 
	usec % 1000000);
}

KrTime
operator - (const KrTime& a, const KrTime& b)
{
    int usec = a._tv.tv_usec - b._tv.tv_usec;	
    return KrTime(a._tv.tv_sec - b._tv.tv_sec - (usec < 0),
	(usec < 0) ? usec + 1000000 : usec);
}

KrTime&
KrTime::operator += (const KrTime& t)
{
    _tv.tv_usec += t._tv.tv_usec;
    _tv.tv_sec += t._tv.tv_sec + (_tv.tv_usec / 1000000);
    _tv.tv_usec %= 1000000;
    return *this;
}

KrTime&
KrTime::operator -= (const KrTime& t)
{
    _tv.tv_usec -= t._tv.tv_usec;
    _tv.tv_sec -= t._tv.tv_sec;
    if (_tv.tv_usec < 0) {
	_tv.tv_sec--;
	_tv.tv_usec += 1000000;
    }
    return *this;
}