#ifndef _EZPWD_TIMEOFDAY
#define _EZPWD_TIMEOFDAY

#include <sys/time.h>

// 
// ezpwd::timeofday 	-- Return current time.
// ezpwd::epoch    	-- The UNIX epoch.
// ezpwd::seconds	-- convert timeval to a real-valued seconds
// <timeval> < <timeval>-- less-than comparison on timevals
// <timeval> - <timeval>-- difference on timevals
//
namespace ezpwd {
    inline
    timeval			timeofday()
    {
	timeval			tv;
	::gettimeofday( &tv, NULL );
	return tv;
    }

    timeval				epoch()
    {
	timeval			tv;
	tv.tv_sec			= 0;
	tv.tv_usec			= 0;
	return tv;
    }

    inline
    double				seconds( const timeval &rhs )
    {
	return rhs.tv_usec / 1000000.0 + rhs.tv_sec;
    }
} // namespace ezpwd

inline
bool				operator<(
				    const timeval      &lhs,
				    const timeval      &rhs )
{
    return ( lhs.tv_sec 		<  rhs.tv_sec
	     || (( lhs.tv_sec		== rhs.tv_sec )
		 && ( lhs.tv_usec 	<  rhs.tv_usec )));
}

inline
timeval				operator-(
				    const timeval      &lhs,
				    timeval             rhs ) // copy; adjusted...
{
    timeval			result;
    if ( lhs < rhs ) {
	result				= ezpwd::epoch();
    } else {
	// See http://www.gnu.org/software/libc/manual/html_node/Elapsed-Time.html
	if ( lhs.tv_usec < rhs.tv_usec ) {
	    int 		sec	= ( rhs.tv_usec - lhs.tv_usec ) / 1000000 + 1;
	    rhs.tv_usec		       -= sec * 1000000;
	    rhs.tv_sec		       += sec;
	}
	if ( lhs.tv_usec - rhs.tv_usec > 1000000 ) {
	    int 		sec	= ( lhs.tv_usec - rhs.tv_usec ) / 1000000;
	    rhs.tv_usec 	       += sec * 1000000;
	    rhs.tv_sec		       -= sec;
	}
	result.tv_sec			= lhs.tv_sec  - rhs.tv_sec;
	result.tv_usec			= lhs.tv_usec - rhs.tv_usec;
    }
    return result;
}

#endif // _EZPWD_TIMEOFDAY
