2  * chutest - test the CHU clock
61 int dofilter = 0;	/* set to 1 when we should run filter algorithm */
62 int showtimes = 0;	/* set to 1 when we should show char arrival times */
63 int doprocess = 0;	/* set to 1 when we do processing analogous to driver */
65 int usechuldisc = 0;	/* set to 1 when CHU line discipline should be used */
68 int usechuldisc = 0;	/* set to 1 when CHU line discipline should be used */
79 void	raw_filter(unsigned int c, struct timeval *tv);
84  * main - parse arguments and handle options
133 		(void) fprintf(stderr, "usage: %s [-dft] tty_device\n",  in main()
137 		(void) fprintf(stderr, "usage: %s [-dft] tty_device\n",  in main()
142 		(void) fprintf(stderr, "usage: %s [-cdft] tty_device\n",  in main()
168  * openterm - open a port to the CHU clock
236  * process_raw - process characters in raw mode
245 	struct timeval tv;  in process_raw()  local
249 		(void) gettimeofday(&tv, (struct timezone *)0);  in process_raw()
251 		    raw_filter((unsigned int)c, &tv);  in process_raw()
253 			difftv.tv_sec = tv.tv_sec - lasttv.tv_sec;  in process_raw()
254 			difftv.tv_usec = tv.tv_usec - lasttv.tv_usec;  in process_raw()
256 				difftv.tv_sec--;  in process_raw()
260 				      c, tv.tv_sec, tv.tv_usec, difftv.tv_sec,  in process_raw()
262 			lasttv = tv;  in process_raw()
275  * raw_filter - run the line discipline filter over raw data
280 	struct timeval *tv  in raw_filter()  argument
296 		diff.tv_sec = tv->tv_sec  in raw_filter()
297 			- chudata.codetimes[chudata.ncodechars].tv_sec;  in raw_filter()
298 		diff.tv_usec = tv->tv_usec  in raw_filter()
299 			- chudata.codetimes[chudata.ncodechars].tv_usec;  in raw_filter()
301 			diff.tv_sec--;  in raw_filter()
314 	chudata.codetimes[chudata.ncodechars] = *tv;  in raw_filter()
319 			TVTOTS(&chudata.codetimes[NCHUCHARS-1], &ts);  in raw_filter()
321 			chufilter(&chudata, &chudata.codetimes[NCHUCHARS-1]);  in raw_filter()
341  * process_ldisc - process line discipline
363 			TVTOTS(&chu.codetimes[NCHUCHARS-1], &ts);  in process_ldisc()
372 						- chu.codetimes[i-1].tv_sec;  in process_ldisc()
374 						- chu.codetimes[i-1].tv_usec;  in process_ldisc()
376 						diff.tv_sec--;  in process_ldisc()
397  * error - print an error message
423  * is set to 290 ms and we compute delays which are at least 10 ms long.
440 #define	CHUPRECISION	(-9)		/* what the heck */
453 #define	MULBY60(x)	(((x)<<6) - ((x)<<2))	/* watch overflow */
466  * character after the on-time second and is computed as follows:
491  * Keep the fudge factors separately so they can be set even
512  * init_chu - initialize internal chu driver data
561 	    printf("%c%c", (chuc->codechars[i] & 0xf) + '0',  in chufilter()
562 		   ((chuc->codechars[i]>>4) & 0xf) + '0');  in chufilter()
569 	    if (chuc->codechars[i] != chuc->codechars[i+(NCHUCHARS/2)]) {  in chufilter()
581 		*code++ = chuc->codechars[i] & 0xf;  in chufilter()
582 		*code++ = (chuc->codechars[i] >> 4) & 0xf;  in chufilter()
623 	tmp = (u_long)(MULBY24((day-1)) + hour);	/* hours */  in chufilter()
636 	if (date_ui < (rtime->l_ui + CLOCK_WAYTOOBIG)  in chufilter()
637 	    && date_ui > (rtime->l_ui - CLOCK_WAYTOOBIG))  in chufilter()
644 	date_ui = calyearstart(rtime->l_ui, NULL);  in chufilter()
649 			      date_ui, rtime->l_ui, (long)date_ui-(long)rtime->l_ui);  in chufilter()
650 		if (date_ui < (rtime->l_ui + CLOCK_WAYTOOBIG)  in chufilter()
651 		    && date_ui > (rtime->l_ui - CLOCK_WAYTOOBIG))  in chufilter()
669 	if ((rtime->l_ui - yearstart) < CLOCK_WAYTOOBIG) {  in chufilter()
671 		date_ui += calyearstart(yearstart - CLOCK_WAYTOOBIG,  in chufilter()
673 		if ((rtime->l_ui - date_ui) < CLOCK_WAYTOOBIG)  in chufilter()
685 	if ((date_ui - rtime->l_ui) >= CLOCK_WAYTOOBIG) {  in chufilter()
702 		tmp = chuc->codetimes[i].tv_sec + JAN_1970;  in chufilter()
703 		TVUTOTSF(chuc->codetimes[i].tv_usec, tmp2);  in chufilter()
733 	 * Here is a multiply-by-0.1 optimization that should apply  in chufilter()