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// SPDX-License-Identifier: LGPL-2.1+
#include <kunit/test.h>
#include <linux/rtc.h>
/*
* Advance a date by one day.
*/
static void advance_date(int *year, int *month, int *mday, int *yday)
{
if (*mday != rtc_month_days(*month - 1, *year)) {
++*mday;
++*yday;
return;
}
*mday = 1;
if (*month != 12) {
++*month;
++*yday;
return;
}
*month = 1;
*yday = 1;
++*year;
}
/*
* Check every day in specified number of years interval starting on 1970-01-01
* against the expected result.
*/
static void rtc_time64_to_tm_test_date_range(struct kunit *test, int years)
{
/*
* years = (years / 400) * 400 years
* = (years / 400) * 146097 days
* = (years / 400) * 146097 * 86400 seconds
*/
time64_t total_secs = ((time64_t)years) / 400 * 146097 * 86400;
int year = 1970;
int month = 1;
int mday = 1;
int yday = 1;
struct rtc_time result;
time64_t secs;
s64 days;
for (secs = 0; secs <= total_secs; secs += 86400) {
rtc_time64_to_tm(secs, &result);
days = div_s64(secs, 86400);
#define FAIL_MSG "%d/%02d/%02d (%2d) : %lld", \
year, month, mday, 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, mday, result.tm_mday, FAIL_MSG);
KUNIT_ASSERT_EQ_MSG(test, yday, result.tm_yday, FAIL_MSG);
advance_date(&year, &month, &mday, &yday);
}
}
/*
* Checks every day in a 160000 years interval starting on 1970-01-01
* against the expected result.
*/
static void rtc_time64_to_tm_test_date_range_160000(struct kunit *test)
{
rtc_time64_to_tm_test_date_range(test, 160000);
}
/*
* Checks every day in a 1000 years interval starting on 1970-01-01
* against the expected result.
*/
static void rtc_time64_to_tm_test_date_range_1000(struct kunit *test)
{
rtc_time64_to_tm_test_date_range(test, 1000);
}
static struct kunit_case rtc_lib_test_cases[] = {
KUNIT_CASE(rtc_time64_to_tm_test_date_range_1000),
KUNIT_CASE_SLOW(rtc_time64_to_tm_test_date_range_160000),
{}
};
static struct kunit_suite rtc_lib_test_suite = {
.name = "rtc_lib_test_cases",
.test_cases = rtc_lib_test_cases,
};
kunit_test_suite(rtc_lib_test_suite);
MODULE_LICENSE("GPL");
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