diff options
-rw-r--r-- | ChangeLog | 5 | ||||
-rw-r--r-- | time.c | 41 |
2 files changed, 30 insertions, 16 deletions
@@ -1,3 +1,8 @@ +Wed Jun 9 22:51:50 2010 Tanaka Akira <akr@fsij.org> + + * time.c (find_time_t): always outerpolate from past. + [ruby-core:30672] reported by Benoit Daloze. + Wed Jun 9 22:13:08 2010 Tanaka Akira <akr@fsij.org> * time.c (calc_tm_yday): extracted from timegmw_noleapsecond. @@ -2674,6 +2674,7 @@ find_time_t(struct tm *tptr, int utc_p, time_t *tp) int find_dst; struct tm result; int status; + int tptr_tm_yday; #define GUESS(p) (DEBUG_FIND_TIME_NUMGUESS_INC (utc_p ? gmtime_with_leapsecond(p, &result) : LOCALTIME(p, result))) @@ -2901,22 +2902,30 @@ find_time_t(struct tm *tptr, int utc_p, time_t *tp) } } /* Given argument has no corresponding time_t. Let's outerpolation. */ - if (tm_lo.tm_year == tptr->tm_year && tm_lo.tm_mon == tptr->tm_mon) { - *tp = guess_lo + - (tptr->tm_mday - tm_lo.tm_mday) * 24 * 60 * 60 + - (tptr->tm_hour - tm_lo.tm_hour) * 60 * 60 + - (tptr->tm_min - tm_lo.tm_min) * 60 + - (tptr->tm_sec - tm_lo.tm_sec); - return NULL; - } - else if (tm_hi.tm_year == tptr->tm_year && tm_hi.tm_mon == tptr->tm_mon) { - *tp = guess_hi + - (tptr->tm_mday - tm_hi.tm_mday) * 24 * 60 * 60 + - (tptr->tm_hour - tm_hi.tm_hour) * 60 * 60 + - (tptr->tm_min - tm_hi.tm_min) * 60 + - (tptr->tm_sec - tm_hi.tm_sec); - return NULL; - } + /* + * `Seconds Since the Epoch' in SUSv3: + * tm_sec + tm_min*60 + tm_hour*3600 + tm_yday*86400 + + * (tm_year-70)*31536000 + ((tm_year-69)/4)*86400 - + * ((tm_year-1)/100)*86400 + ((tm_year+299)/400)*86400 + */ + + tptr_tm_yday = calc_tm_yday(tptr->tm_year, tptr->tm_mon, tptr->tm_mday); + + *tp = guess_lo + + ((tptr->tm_year - tm_lo.tm_year) * 365 + + ((tptr->tm_year-69)/4) - + ((tptr->tm_year-1)/100) + + ((tptr->tm_year+299)/400) - + ((tm_lo.tm_year-69)/4) + + ((tm_lo.tm_year-1)/100) - + ((tm_lo.tm_year+299)/400) + + tptr_tm_yday - + tm_lo.tm_yday) * 86400 + + (tptr->tm_hour - tm_lo.tm_hour) * 3600 + + (tptr->tm_min - tm_lo.tm_min) * 60 + + (tptr->tm_sec - tm_lo.tm_sec); + + return NULL; out_of_range: return "time out of range"; |