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| 2 |
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| 3 | #include <kunit/test.h>
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| 4 | #include <linux/time.h>
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| 5 |
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| 6 | |
| 7 | * Traditional implementation of leap year evaluation, but note that long
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| 8 | * is a signed type and the tests do cover negative year values. So this
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| 9 | * can't use the is_leap_year() helper from rtc.h.
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| 10 |
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| 11 | static bool is_leap(long year)
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| 12 | {
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| 13 | return year % 4 == 0 && (year % 100 != 0 || year % 400 == 0);
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| 14 | }
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| 15 |
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| 16 | |
| 17 | * Gets the last day of a month.
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| 18 |
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| 19 | static int last_day_of_month(long year, int month)
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| 20 | {
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| 21 | if (month == 2)
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| 22 | return 28 + is_leap(year);
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| 23 | if (month == 4 || month == 6 || month == 9 || month == 11)
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| 24 | return 30;
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| 25 | return 31;
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| 26 | }
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| 27 |
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| 28 | |
| 29 | * Advances a date by one day.
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| 30 |
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| 31 | static void advance_date(long *year, int *month, int *mday, int *yday)
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| 32 | {
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| 33 | if (*mday != last_day_of_month(*year, *month)) {
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| 34 | ++*mday;
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| 35 | ++*yday;
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| 36 | return;
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| 37 | }
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| 38 |
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| 39 | *mday = 1;
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| 40 | if (*month != 12) {
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| 41 | ++*month;
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| 42 | ++*yday;
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| 43 | return;
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| 44 | }
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| 45 |
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| 46 | *month = 1;
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| 47 | *yday = 0;
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| 48 | ++*year;
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| 49 | }
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| 50 |
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| 51 | |
| 52 | * Checks every day in a 160000 years interval centered at 1970-01-01
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| 53 | * against the expected result.
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| 54 |
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| 55 | static void time64_to_tm_test_date_range(struct kunit *test)
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| 56 | {
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| 57 | |
| 58 | * 80000 years = (80000 / 400) * 400 years
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| 59 | * = (80000 / 400) * 146097 days
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| 60 | * = (80000 / 400) * 146097 * 86400 seconds
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| 61 |
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| 62 | time64_t total_secs = ((time64_t) 80000) / 400 * 146097 * 86400;
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| 63 | long year = 1970 - 80000;
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| 64 | int month = 1;
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| 65 | int mdday = 1;
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| 66 | int yday = 0;
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| 67 |
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| 68 | struct tm result;
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| 69 | time64_t secs;
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| 70 | s64 days;
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| 71 |
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| 72 | for (secs = -total_secs; secs <= total_secs; secs += 86400) {
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| 73 |
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| 74 | time64_to_tm(secs, 0, &result);
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| 75 |
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| 76 | days = div_s64(secs, 86400);
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| 77 |
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| 78 | #define FAIL_MSG "%05ld/%02d/%02d (%2d) : %lld", \
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| 79 | year, month, mdday, yday, days
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| 80 |
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| 81 | KUNIT_ASSERT_EQ_MSG(test, year - 1900, result.tm_year, FAIL_MSG);
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| 82 | KUNIT_ASSERT_EQ_MSG(test, month - 1, result.tm_mon, FAIL_MSG);
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| 83 | KUNIT_ASSERT_EQ_MSG(test, mdday, result.tm_mday, FAIL_MSG);
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| 84 | KUNIT_ASSERT_EQ_MSG(test, yday, result.tm_yday, FAIL_MSG);
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| 85 |
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| 86 | advance_date(&year, &month, &mdday, &yday);
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| 87 | }
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| 88 | }
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| 89 |
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| 90 | static struct kunit_case time_test_cases[] = {
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| 91 | KUNIT_CASE_SLOW(time64_to_tm_test_date_range),
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| 92 | {}
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| 93 | };
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| 94 |
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| 95 | static struct kunit_suite time_test_suite = {
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| 96 | .name = "time_test_cases",
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| 97 | .test_cases = time_test_cases,
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| 98 | };
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| 99 |
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| 100 | kunit_test_suite(time_test_suite);
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| 101 | MODULE_DESCRIPTION("time unit test suite");
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| 102 | MODULE_LICENSE("GPL");
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