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With 64bit time_t years can be negative and lapyear computation 

requires rounding down. This avoids an infinite loop in localtime().
This commit is contained in:
mlelstv 2009-10-24 17:01:04 +00:00
parent 0b807be843
commit df0cec4903
1 changed files with 3 additions and 3 deletions
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6
lib/libc/time/localtime.c
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@ -1,4 +1,4 @@
/* $NetBSD: localtime.c,v 1.43 2009/01/18 10:57:15 drochner Exp $ */
/* $NetBSD: localtime.c,v 1.44 2009/10/24 17:01:04 mlelstv Exp $ */
/*
** This file is in the public domain, so clarified as of
@ -10,7 +10,7 @@
#if 0
static char elsieid[] = "@(#)localtime.c 7.78";
#else
__RCSID("$NetBSD: localtime.c,v 1.43 2009/01/18 10:57:15 drochner Exp $");
__RCSID("$NetBSD: localtime.c,v 1.44 2009/10/24 17:01:04 mlelstv Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
@ -1290,7 +1290,7 @@ register struct tm * const tmp;
if (tmp->tm_wday < 0)
tmp->tm_wday += DAYSPERWEEK;
y = EPOCH_YEAR;
#define LEAPS_THRU_END_OF(y) ((y) / 4 - (y) / 100 + (y) / 400)
#define LEAPS_THRU_END_OF(y) ((y) < 0 ? ((y)-3)/4 - ((y)-99)/100 + ((y)-399)/400 : (y)/4 - (y)/100 + (y)/400)
while (days < 0 || days >= (long) year_lengths[yleap = isleap(y)]) {
register time_t newy;
newy = (y + days / DAYSPERNYEAR);