/*
 * Stopwatch
 * Copyright (C) 2013  Adam Williams <broadcast at earthling dot net>
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * 
 */

#include <stdint.h>
#include <stdio.h>
#include <sys/select.h>
#include <sys/time.h>




int main()
{
	struct timeval current_time;
	struct timeval start_time;
	struct timeval select_time;


	while(1)
	{
		printf("Press Enter to stop.\n");
		fd_set fds;


		gettimeofday(&start_time, 0);
		while(1)
		{
			usleep(100000);
			gettimeofday(&current_time, 0);
			int64_t useconds = (current_time.tv_sec * 1000000 + current_time.tv_usec) -
				(start_time.tv_sec * 1000000 + start_time.tv_usec);
			int hours = useconds / ((int64_t)60 * 60 * 1000000);
			int minutes = (useconds / ((int64_t)60 * 1000000)) % 60;
			int seconds = (useconds / (int64_t)1000000) % 60;
			int hseconds = (useconds / 10000) % 100;
			printf("%02d:%02d:%02d:%02d\r",
				hours, 
				minutes,
				seconds,
				hseconds);
			fflush(stdout);


			FD_ZERO(&fds);
			FD_SET(0, &fds);
			select_time.tv_sec = 0;
			select_time.tv_usec = 0;
			int got_stop = select(1, &fds, 0, 0, &select_time);
			if(got_stop)
			{
				printf("Got stop.                        \n");
				getc(stdin);
				break;
			}
		}


		printf("Press Enter to start.\n");
		getc(stdin);
	}
}