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[CIFS] Fix leaps year calculation for years after 2100

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Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Steve French 2006-10-11 03:49:30 +00:00
parent 268f3be177
commit 438dd92626
1 changed files with 9 additions and 0 deletions
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9
fs/cifs/netmisc.c
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@ -946,6 +946,15 @@ struct timespec cnvrtDosUnixTm(__u16 date, __u16 time)
year = sd->Year;
days += year * 365;
days += (year/4); /* leap year */
/* generalized leap year calculation is more complex, ie no leap year
for years/100 except for years/400, but since the maximum number for DOS
year is 2**7, the last year is 1980+127, which means we need only
consider 2 special case years, ie the years 2000 and 2100, and only
adjust for the lack of leap year for the year 2100, as 2000 was a
leap year (divisable by 400) */
if(year >= 120) /* the year 2100 */
days = days - 1; /* do not count leap year for the year 2100 */
/* adjust for leap year where we are still before leap day */
days -= ((year & 0x03) == 0) && (month < 2 ? 1 : 0);
sec += 24 * 60 * 60 * days;