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- // SPDX-License-Identifier: LGPL-2.1+
- #include <kunit/test.h>
- #include <linux/time.h>
- /*
- * Traditional implementation of leap year evaluation.
- */
- 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) : %ld", \
- 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(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_LICENSE("GPL");
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