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authorSteve French <sfrench@us.ibm.com>2006-10-11 03:49:30 +0000
committerSteve French <sfrench@us.ibm.com>2006-10-11 03:49:30 +0000
commit438dd926260f11ff01fc3441ac6dd4c412d20ea4 (patch)
treea596911eeb08f23ec9b1027bb47e89582ae6edbf /fs
parent268f3be177ce93791da38facc34126b5038cd851 (diff)
[CIFS] Fix leaps year calculation for years after 2100
Signed-off-by: Steve French <sfrench@us.ibm.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/cifs/netmisc.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/cifs/netmisc.c b/fs/cifs/netmisc.c
index 3d86b31cf2e..32562d19955 100644
--- a/fs/cifs/netmisc.c
+++ b/fs/cifs/netmisc.c
@@ -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;