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Handle localtime_r() failure in j1939 timedate 

When the call to localtime_r() fails (by returning NULL, as per the POSIX specification), make sure to fill the hour/minute offsets with the fallback values as specified in the J1939DA supporting information.
pull/627/head
Samantaz Fox 2026-05-05 21:47:40 +00:00 committed by GitHub
parent 99ab67143a
commit e9b81276e5
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1 changed files with 16 additions and 10 deletions
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6
j1939_timedate/j1939_timedate_srv.c
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@ -41,6 +41,7 @@ static void gmtime_to_j1939_pgn_65254_td(struct j1939_time_date_packet *tdp)
utc_tm = gmtime_r(&now, &utc_tm_buf);
local_tm = localtime_r(&now, &local_tm_buf);
if (local_tm != NULL) {
/* Calculate the offsets */
hour_offset = local_tm->tm_hour - utc_tm->tm_hour;
minute_offset = local_tm->tm_min - utc_tm->tm_min;
@ -52,6 +53,11 @@ static void gmtime_to_j1939_pgn_65254_td(struct j1939_time_date_packet *tdp)
else
hour_offset -= 24; /* before midnight */
}
} else {
/* The local time offsets cannot be determined at the moment */
hour_offset = 0xF9;
minute_offset = 0xFF;
}
/*
* Seconds (spn959):