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99 lines
2.0 KiB
99 lines
2.0 KiB
// SPDX-License-Identifier: LGPL-2.1+ |
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#include <kunit/test.h> |
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#include <linux/time.h> |
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/* |
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* Traditional implementation of leap year evaluation. |
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*/ |
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static bool is_leap(long year) |
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{ |
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return year % 4 == 0 && (year % 100 != 0 || year % 400 == 0); |
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} |
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/* |
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* Gets the last day of a month. |
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*/ |
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static int last_day_of_month(long year, int month) |
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{ |
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if (month == 2) |
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return 28 + is_leap(year); |
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if (month == 4 || month == 6 || month == 9 || month == 11) |
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return 30; |
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return 31; |
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} |
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/* |
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* Advances a date by one day. |
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*/ |
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static void advance_date(long *year, int *month, int *mday, int *yday) |
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{ |
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if (*mday != last_day_of_month(*year, *month)) { |
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++*mday; |
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++*yday; |
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return; |
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} |
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*mday = 1; |
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if (*month != 12) { |
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++*month; |
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++*yday; |
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return; |
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} |
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*month = 1; |
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*yday = 0; |
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++*year; |
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} |
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/* |
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* Checks every day in a 160000 years interval centered at 1970-01-01 |
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* against the expected result. |
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*/ |
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static void time64_to_tm_test_date_range(struct kunit *test) |
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{ |
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/* |
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* 80000 years = (80000 / 400) * 400 years |
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* = (80000 / 400) * 146097 days |
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* = (80000 / 400) * 146097 * 86400 seconds |
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*/ |
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time64_t total_secs = ((time64_t) 80000) / 400 * 146097 * 86400; |
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long year = 1970 - 80000; |
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int month = 1; |
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int mdday = 1; |
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int yday = 0; |
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struct tm result; |
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time64_t secs; |
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s64 days; |
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for (secs = -total_secs; secs <= total_secs; secs += 86400) { |
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time64_to_tm(secs, 0, &result); |
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days = div_s64(secs, 86400); |
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#define FAIL_MSG "%05ld/%02d/%02d (%2d) : %ld", \ |
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year, month, mdday, yday, days |
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KUNIT_ASSERT_EQ_MSG(test, year - 1900, result.tm_year, FAIL_MSG); |
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KUNIT_ASSERT_EQ_MSG(test, month - 1, result.tm_mon, FAIL_MSG); |
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KUNIT_ASSERT_EQ_MSG(test, mdday, result.tm_mday, FAIL_MSG); |
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KUNIT_ASSERT_EQ_MSG(test, yday, result.tm_yday, FAIL_MSG); |
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advance_date(&year, &month, &mdday, &yday); |
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} |
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} |
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static struct kunit_case time_test_cases[] = { |
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KUNIT_CASE(time64_to_tm_test_date_range), |
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{} |
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}; |
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static struct kunit_suite time_test_suite = { |
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.name = "time_test_cases", |
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.test_cases = time_test_cases, |
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}; |
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kunit_test_suite(time_test_suite); |
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MODULE_LICENSE("GPL");
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