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lib/date: Make rtc_mktime and mktime64 Y2038-ready

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We currently overflow due to wrong types used internally in rtc_mktime,
on all platforms, and we return a too small type on 32-bit.

One consumer that directly benefits from this is mktime64. Many others
may still store the result in a wrong type.

While at it, drop the redundant cast of mon in rtc_mktime (obsoleted by
714209832d).

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
This commit is contained in:
Jan Kiszka 2022-04-24 11:34:56 +02:00 • committed by Tom Rini
parent bfae2744dd
commit 90c52423be
3 changed files with 10 additions and 14 deletions
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13
lib/date.c
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@ -71,19 +71,16 @@ int rtc_calc_weekday(struct rtc_time *tm)
* -year / 100 + year / 400 terms, and add 10.]
*
* This algorithm was first published by Gauss (I think).
*
* WARNING: this function will overflow on 2106-02-07 06:28:16 on
* machines where long is 32-bit! (However, as time_t is signed, we
* will already get problems at other places on 2038-01-19 03:14:08)
*/
unsigned long rtc_mktime(const struct rtc_time *tm)
time64_t rtc_mktime(const struct rtc_time *tm)
{
int mon = tm->tm_mon;
int year = tm->tm_year;
int days, hours;
unsigned long days;
time64_t hours;
mon -= 2;
if (0 >= (int)mon) { /* 1..12 -> 11, 12, 1..10 */
if (0 >= mon) { /* 1..12 -> 11, 12, 1..10 */
mon += 12; /* Puts Feb last since it has leap day */
year -= 1;
}
@ -109,5 +106,5 @@ time64_t mktime64(const unsigned int year, const unsigned int mon,
time.tm_min = min;
time.tm_sec = sec;
return (time64_t)rtc_mktime((const struct rtc_time *)&time);
return rtc_mktime((const struct rtc_time *)&time);
}