mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-26 06:05:03 +07:00
e4a93be6cb
Changed the whole algorithm for a call to mktime64 that takes care of all that details. Signed-off-by: Oscar Forner Martinez <oscar.forner.martinez@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>
71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
/*
|
|
* linux/fs/isofs/util.c
|
|
*/
|
|
|
|
#include <linux/time.h>
|
|
#include "isofs.h"
|
|
|
|
/*
|
|
* We have to convert from a MM/DD/YY format to the Unix ctime format.
|
|
* We have to take into account leap years and all of that good stuff.
|
|
* Unfortunately, the kernel does not have the information on hand to
|
|
* take into account daylight savings time, but it shouldn't matter.
|
|
* The time stored should be localtime (with or without DST in effect),
|
|
* and the timezone offset should hold the offset required to get back
|
|
* to GMT. Thus we should always be correct.
|
|
*/
|
|
|
|
int iso_date(char * p, int flag)
|
|
{
|
|
int year, month, day, hour, minute, second, tz;
|
|
int crtime;
|
|
|
|
year = p[0];
|
|
month = p[1];
|
|
day = p[2];
|
|
hour = p[3];
|
|
minute = p[4];
|
|
second = p[5];
|
|
if (flag == 0) tz = p[6]; /* High sierra has no time zone */
|
|
else tz = 0;
|
|
|
|
if (year < 0) {
|
|
crtime = 0;
|
|
} else {
|
|
crtime = mktime64(year+1900, month, day, hour, minute, second);
|
|
|
|
/* sign extend */
|
|
if (tz & 0x80)
|
|
tz |= (-1 << 8);
|
|
|
|
/*
|
|
* The timezone offset is unreliable on some disks,
|
|
* so we make a sanity check. In no case is it ever
|
|
* more than 13 hours from GMT, which is 52*15min.
|
|
* The time is always stored in localtime with the
|
|
* timezone offset being what get added to GMT to
|
|
* get to localtime. Thus we need to subtract the offset
|
|
* to get to true GMT, which is what we store the time
|
|
* as internally. On the local system, the user may set
|
|
* their timezone any way they wish, of course, so GMT
|
|
* gets converted back to localtime on the receiving
|
|
* system.
|
|
*
|
|
* NOTE: mkisofs in versions prior to mkisofs-1.10 had
|
|
* the sign wrong on the timezone offset. This has now
|
|
* been corrected there too, but if you are getting screwy
|
|
* results this may be the explanation. If enough people
|
|
* complain, a user configuration option could be added
|
|
* to add the timezone offset in with the wrong sign
|
|
* for 'compatibility' with older discs, but I cannot see how
|
|
* it will matter that much.
|
|
*
|
|
* Thanks to kuhlmav@elec.canterbury.ac.nz (Volker Kuhlmann)
|
|
* for pointing out the sign error.
|
|
*/
|
|
if (-52 <= tz && tz <= 52)
|
|
crtime -= tz * 15 * 60;
|
|
}
|
|
return crtime;
|
|
}
|