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| author | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2017-01-24 01:56:00 +0100 |
|---|---|---|
| committer | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2017-01-24 01:56:00 +0100 |
| commit | dc5486ba8801625069fc6172b03e897612f42a90 (patch) | |
| tree | de3c8b460d7cf5afe5d42be49ec8f1a7eb52f908 /i386/i386at/rtc.c | |
| parent | 941d462425fb2692fd9ffea1ab03e927697fcfb0 (diff) | |
| download | gnumach-dc5486ba8801625069fc6172b03e897612f42a90.tar.gz gnumach-dc5486ba8801625069fc6172b03e897612f42a90.tar.bz2 gnumach-dc5486ba8801625069fc6172b03e897612f42a90.zip | |
Fix bissextile years computation
In practice, fixes 2100, 2200, 2300, 2500, 2600, 2700, etc.
* i386/i386at/rtc.c (yeartoday): Make years divisible by 100 but not
divisible by 400 non-bisextile.
Diffstat (limited to 'i386/i386at/rtc.c')
| -rw-r--r-- | i386/i386at/rtc.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/i386/i386at/rtc.c b/i386/i386at/rtc.c index 01e09772..b284c332 100644 --- a/i386/i386at/rtc.c +++ b/i386/i386at/rtc.c @@ -109,7 +109,24 @@ static int month[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; int yeartoday(int year) { - return((year%4) ? 365 : 366); + if (year%4) + /* Not divisible by 4, not bissextile */ + return 365; + + /* Divisible by 4 */ + if (year % 100) + /* Not divisible by 100, bissextile */ + return 366; + + /* Divisible by 100 */ + if (year % 400) + /* Not divisible by 400, not bissextile */ + return 365; + + /* Divisible by 400 */ + /* Rules for 2000 and further have not been officially decided yet. + * 2000 was made bissextile. */ + return 366; } int |