mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-15 13:22:55 +00:00
94f2f71577
fs/isofs includes trimmed down to something resembling sanity.
Kernel-only parts of linux/iso_fs.h and entire linux/iso_fs_{sb,i}.h
moved to fs/isofs/isofs.h.
A lot of useless #include in fs/isofs/*.c killed.
Signed-off-by: Al Viro <viro@parcelfarce.linux.theplanet.co.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
81 lines
2.4 KiB
C
81 lines
2.4 KiB
C
/*
|
|
* linux/fs/isofs/util.c
|
|
*/
|
|
|
|
#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, days, i;
|
|
|
|
year = p[0] - 70;
|
|
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 {
|
|
int monlen[12] = {31,28,31,30,31,30,31,31,30,31,30,31};
|
|
|
|
days = year * 365;
|
|
if (year > 2)
|
|
days += (year+1) / 4;
|
|
for (i = 1; i < month; i++)
|
|
days += monlen[i-1];
|
|
if (((year+2) % 4) == 0 && month > 2)
|
|
days++;
|
|
days += day - 1;
|
|
crtime = ((((days * 24) + hour) * 60 + minute) * 60)
|
|
+ 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;
|
|
}
|