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[BZ #469] Imported from gnulib.

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* time/mktime.c (__isleap): Remove; all uses replaced by:
	(leapyear): New function, which avoids overflow by not adding
	1900 to year before testing whether it is a leap year.
This commit is contained in:
Roland McGrath 2004-10-22 22:15:54 +00:00
parent c60a75408e
commit 7203529423
2 changed files with 17 additions and 7 deletions
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ChangeLog
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@ -1,5 +1,10 @@
2004-10-22 Paul Eggert <eggert@cs.ucla.edu>
[BZ #469] Imported from gnulib.
* time/mktime.c (__isleap): Remove; all uses replaced by:
(leapyear): New function, which avoids overflow by not adding
1900 to year before testing whether it is a leap year.
[BZ #472] Imported from gnulib.
* time/mktime.c (Local Variables): Remove -DHAVE_TIME_R_POSIX;
no longer used.

19
time/mktime.c
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@ -75,12 +75,17 @@ verify (right_shift_propagates_sign, -1 >> 1 == -1);
#define TM_YEAR_BASE 1900
verify (base_year_is_a_multiple_of_100, TM_YEAR_BASE % 100 == 0);
#ifndef __isleap
/* Nonzero if YEAR is a leap year (every 4 years,
except every 100th isn't, and every 400th is). */
# define __isleap(year) \
((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
#endif
/* Return 1 if YEAR + TM_YEAR_BASE is a leap year. */
static inline int
leapyear (int year)
{
/* Don't add YEAR to TM_YEAR_BASE, as that might overflow.
Also, work even if YEAR is negative. */
return
((year & 3) == 0
&& (year % 100 != 0
|| ((year / 100) & 3) == (- (TM_YEAR_BASE / 100) & 3)));
}
/* How many days come before each month (0-12). */
#ifndef _LIBC
@ -234,7 +239,7 @@ __mktime_internal (struct tm *tp,
/* Calculate day of year from year, month, and day of month.
The result need not be in range. */
int yday = ((__mon_yday[__isleap (year + TM_YEAR_BASE)]
int yday = ((__mon_yday[leapyear (year)]
[mon_remainder + 12 * negative_mon_remainder])
+ mday - 1);