// SPDX-License-Identifier: LGPL-2.1+ #include <kunit/test.h>#include <linux/time.h> /* * Traditional implementation of leap year evaluation, but note that long * is a signed type and the tests do cover negative year values. So this * can't use the is_leap_year() helper from rtc.h. */static bool is_leap(long year){	return year % 4 == 0 && (year % 100 != 0 || year % 400 == 0);} /* * Gets the last day of a month. */static int last_day_of_month(long year, int month){	if (month == 2)		return 28 + is_leap(year);	if (month == 4 || month == 6 || month == 9 || month == 11)		return 30;	return 31;} /* * Advances a date by one day. */static void advance_date(long *year, int *month, int *mday, int *yday){	if (*mday != last_day_of_month(*year, *month)) {		++*mday;		++*yday;		return;	} 	*mday = 1;	if (*month != 12) {		++*month;		++*yday;		return;	} 	*month = 1;	*yday  = 0;	++*year;} /* * Checks every day in a 160000 years interval centered at 1970-01-01 * against the expected result. */static void time64_to_tm_test_date_range(struct kunit *test){	/*	 * 80000 years	= (80000 / 400) * 400 years	 *		= (80000 / 400) * 146097 days	 *		= (80000 / 400) * 146097 * 86400 seconds	 */	time64_t total_secs = ((time64_t) 80000) / 400 * 146097 * 86400;	long year = 1970 - 80000;	int month = 1;	int mdday = 1;	int yday = 0; 	struct tm result;	time64_t secs;	s64 days; 	for (secs = -total_secs; secs <= total_secs; secs += 86400) { 		time64_to_tm(secs, 0, &result); 		days = div_s64(secs, 86400); 		#define FAIL_MSG "%05ld/%02d/%02d (%2d) : %lld", \			year, month, mdday, yday, days 		KUNIT_ASSERT_EQ_MSG(test, year - 1900, result.tm_year, FAIL_MSG);		KUNIT_ASSERT_EQ_MSG(test, month - 1, result.tm_mon, FAIL_MSG);		KUNIT_ASSERT_EQ_MSG(test, mdday, result.tm_mday, FAIL_MSG);		KUNIT_ASSERT_EQ_MSG(test, yday, result.tm_yday, FAIL_MSG); 		advance_date(&year, &month, &mdday, &yday);	}} static struct kunit_case time_test_cases[] = {	KUNIT_CASE_SLOW(time64_to_tm_test_date_range),	{}}; static struct kunit_suite time_test_suite = {	.name = "time_test_cases",	.test_cases = time_test_cases,}; kunit_test_suite(time_test_suite);MODULE_DESCRIPTION("time unit test suite");MODULE_LICENSE("GPL");