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libc: fix terribly broken mktime

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This commit is contained in:
K. Lange 2022-02-25 21:07:53 +09:00
parent 7d2beb443b
commit 89ba900988
1 changed files with 9 additions and 10 deletions
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19
libc/time/localtime.c
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@ -52,14 +52,6 @@ static long days_in_month(int month, int year) {
return 0;
}
static long secs_of_month(int months, int year) {
long days = 0;
for (int i = 1; i < months; ++i) {
days += days_in_month(months, year);
}
return days * SEC_DAY;
}
static struct tm * fill_time(const time_t * timep, struct tm * _timevalue, const char * tzName, int tzOffset) {
time_t timeVal = *timep + tzOffset;
@ -200,11 +192,18 @@ static unsigned int secs_of_years(int years) {
return days * 86400;
}
static long secs_of_month(int months, int year) {
long days = 0;
for (int i = 1; i < months; ++i) {
days += days_in_month(i, year);
}
return days * SEC_DAY;
}
time_t mktime(struct tm *tm) {
return
secs_of_years(tm->tm_year + 1900) +
secs_of_month(tm->tm_mon, tm->tm_year + 1900) +
secs_of_years(tm->tm_year + 1899) +
secs_of_month(tm->tm_mon + 1, tm->tm_year + 1900) +
(tm->tm_mday - 1) * 86400 +
(tm->tm_hour) * 3600 +
(tm->tm_min) * 60 +