2  * SPDX-License-Identifier: BSD-2-Clause
12  * 2. Redistributions in binary form must reproduce the above copyright
199 	int     nd;		/* Number of days--return value */  in ndaysgi()  local
218 	if ((nd = ndaysji(idt)) == -1)  in ndaysgi()
221 		nd = (nd - 10 - (idt->y - 1600) / 100 + (idt->y - 1600) / 400);  in ndaysgi()
222 	else if (nd > nswitch)  in ndaysgi()
223 		nd -= 10;  in ndaysgi()
224 	return (nd);  in ndaysgi()
236 week(int nd, int *y)  in week()  argument
241 	gdate(nd, &dt);  in week()
242 	for (*y = dt.y + 1; nd < (fw = firstweek(*y)); (*y)--)  in week()
244 	return ((nd - fw) / 7 + 1);  in week()
252 	int nd, wd;  in firstweek()  local
258 	nd = ndaysgi(&idt);  in firstweek()
265 	if ((wd = weekday(nd)) > 3)  in firstweek()
266 		return (nd - wd + 7);  in firstweek()
268 		return (nd - wd);  in firstweek()
273 weekday(int nd)  in weekday()  argument
282 	/* return (nd - nmonday) modulo 7 which is the weekday */  in weekday()
283 	nd = (nd - nmonday) % 7;  in weekday()
284 	if (nd < 0)  in weekday()
285 		return (nd + 7);  in weekday()
287 		return (nd);  in weekday()
300 	if (dt->m > 2) {  in date2idt()