#define localeconv() not_here("localeconv")
#endif
-#ifdef HAS_TZNAME
-# if !defined(WIN32) && !defined(__CYGWIN__)
-extern char *tzname[];
-# endif
-#else
-#if !defined(WIN32) || (defined(__MINGW32__) && !defined(tzname))
-char *tzname[] = { "" , "" };
-#endif
-#endif
-
-/* XXX struct tm on some systems (SunOS4/BSD) contains extra (non POSIX)
- * fields for which we don't have Configure support yet:
- * char *tm_zone; -- abbreviation of timezone name
- * long tm_gmtoff; -- offset from GMT in seconds
- * To workaround core dumps from the uninitialised tm_zone we get the
- * system to give us a reasonable struct to copy. This fix means that
- * strftime uses the tm_zone and tm_gmtoff values returned by
- * localtime(time()). That should give the desired result most of the
- * time. But probably not always!
- *
- * This is a temporary workaround to be removed once Configure
- * support is added and NETaa14816 is considered in full.
- * It does not address tzname aspects of NETaa14816.
- */
-#ifdef HAS_GNULIBC
-# ifndef STRUCT_TM_HASZONE
-# define STRUCT_TM_HASZONE
-# endif
-#endif
-
-#ifdef STRUCT_TM_HASZONE
-static void
-init_tm(struct tm *ptm) /* see mktime, strftime and asctime */
-{
- Time_t now;
- (void)time(&now);
- Copy(localtime(&now), ptm, 1, struct tm);
-}
-
-#else
-# define init_tm(ptm)
-#endif
-
-/*
- * mini_mktime - normalise struct tm values without the localtime()
- * semantics (and overhead) of mktime().
- */
-static void
-mini_mktime(struct tm *ptm)
-{
- int yearday;
- int secs;
- int month, mday, year, jday;
- int odd_cent, odd_year;
-
-#define DAYS_PER_YEAR 365
-#define DAYS_PER_QYEAR (4*DAYS_PER_YEAR+1)
-#define DAYS_PER_CENT (25*DAYS_PER_QYEAR-1)
-#define DAYS_PER_QCENT (4*DAYS_PER_CENT+1)
-#define SECS_PER_HOUR (60*60)
-#define SECS_PER_DAY (24*SECS_PER_HOUR)
-/* parentheses deliberately absent on these two, otherwise they don't work */
-#define MONTH_TO_DAYS 153/5
-#define DAYS_TO_MONTH 5/153
-/* offset to bias by March (month 4) 1st between month/mday & year finding */
-#define YEAR_ADJUST (4*MONTH_TO_DAYS+1)
-/* as used here, the algorithm leaves Sunday as day 1 unless we adjust it */
-#define WEEKDAY_BIAS 6 /* (1+6)%7 makes Sunday 0 again */
-
-/*
- * Year/day algorithm notes:
- *
- * With a suitable offset for numeric value of the month, one can find
- * an offset into the year by considering months to have 30.6 (153/5) days,
- * using integer arithmetic (i.e., with truncation). To avoid too much
- * messing about with leap days, we consider January and February to be
- * the 13th and 14th month of the previous year. After that transformation,
- * we need the month index we use to be high by 1 from 'normal human' usage,
- * so the month index values we use run from 4 through 15.
- *
- * Given that, and the rules for the Gregorian calendar (leap years are those
- * divisible by 4 unless also divisible by 100, when they must be divisible
- * by 400 instead), we can simply calculate the number of days since some
- * arbitrary 'beginning of time' by futzing with the (adjusted) year number,
- * the days we derive from our month index, and adding in the day of the
- * month. The value used here is not adjusted for the actual origin which
- * it normally would use (1 January A.D. 1), since we're not exposing it.
- * We're only building the value so we can turn around and get the
- * normalised values for the year, month, day-of-month, and day-of-year.
- *
- * For going backward, we need to bias the value we're using so that we find
- * the right year value. (Basically, we don't want the contribution of
- * March 1st to the number to apply while deriving the year). Having done
- * that, we 'count up' the contribution to the year number by accounting for
- * full quadracenturies (400-year periods) with their extra leap days, plus
- * the contribution from full centuries (to avoid counting in the lost leap
- * days), plus the contribution from full quad-years (to count in the normal
- * leap days), plus the leftover contribution from any non-leap years.
- * At this point, if we were working with an actual leap day, we'll have 0
- * days left over. This is also true for March 1st, however. So, we have
- * to special-case that result, and (earlier) keep track of the 'odd'
- * century and year contributions. If we got 4 extra centuries in a qcent,
- * or 4 extra years in a qyear, then it's a leap day and we call it 29 Feb.
- * Otherwise, we add back in the earlier bias we removed (the 123 from
- * figuring in March 1st), find the month index (integer division by 30.6),
- * and the remainder is the day-of-month. We then have to convert back to
- * 'real' months (including fixing January and February from being 14/15 in
- * the previous year to being in the proper year). After that, to get
- * tm_yday, we work with the normalised year and get a new yearday value for
- * January 1st, which we subtract from the yearday value we had earlier,
- * representing the date we've re-built. This is done from January 1
- * because tm_yday is 0-origin.
- *
- * Since POSIX time routines are only guaranteed to work for times since the
- * UNIX epoch (00:00:00 1 Jan 1970 UTC), the fact that this algorithm
- * applies Gregorian calendar rules even to dates before the 16th century
- * doesn't bother me. Besides, you'd need cultural context for a given
- * date to know whether it was Julian or Gregorian calendar, and that's
- * outside the scope for this routine. Since we convert back based on the
- * same rules we used to build the yearday, you'll only get strange results
- * for input which needed normalising, or for the 'odd' century years which
- * were leap years in the Julian calander but not in the Gregorian one.
- * I can live with that.
- *
- * This algorithm also fails to handle years before A.D. 1 gracefully, but
- * that's still outside the scope for POSIX time manipulation, so I don't
- * care.
- */
-
- year = 1900 + ptm->tm_year;
- month = ptm->tm_mon;
- mday = ptm->tm_mday;
- /* allow given yday with no month & mday to dominate the result */
- if (ptm->tm_yday >= 0 && mday <= 0 && month <= 0) {
- month = 0;
- mday = 0;
- jday = 1 + ptm->tm_yday;
- }
- else {
- jday = 0;
- }
- if (month >= 2)
- month+=2;
- else
- month+=14, year--;
- yearday = DAYS_PER_YEAR * year + year/4 - year/100 + year/400;
- yearday += month*MONTH_TO_DAYS + mday + jday;
- /*
- * Note that we don't know when leap-seconds were or will be,
- * so we have to trust the user if we get something which looks
- * like a sensible leap-second. Wild values for seconds will
- * be rationalised, however.
- */
- if ((unsigned) ptm->tm_sec <= 60) {
- secs = 0;
- }
- else {
- secs = ptm->tm_sec;
- ptm->tm_sec = 0;
- }
- secs += 60 * ptm->tm_min;
- secs += SECS_PER_HOUR * ptm->tm_hour;
- if (secs < 0) {
- if (secs-(secs/SECS_PER_DAY*SECS_PER_DAY) < 0) {
- /* got negative remainder, but need positive time */
- /* back off an extra day to compensate */
- yearday += (secs/SECS_PER_DAY)-1;
- secs -= SECS_PER_DAY * (secs/SECS_PER_DAY - 1);
- }
- else {
- yearday += (secs/SECS_PER_DAY);
- secs -= SECS_PER_DAY * (secs/SECS_PER_DAY);
- }
- }
- else if (secs >= SECS_PER_DAY) {
- yearday += (secs/SECS_PER_DAY);
- secs %= SECS_PER_DAY;
- }
- ptm->tm_hour = secs/SECS_PER_HOUR;
- secs %= SECS_PER_HOUR;
- ptm->tm_min = secs/60;
- secs %= 60;
- ptm->tm_sec += secs;
- /* done with time of day effects */
- /*
- * The algorithm for yearday has (so far) left it high by 428.
- * To avoid mistaking a legitimate Feb 29 as Mar 1, we need to
- * bias it by 123 while trying to figure out what year it
- * really represents. Even with this tweak, the reverse
- * translation fails for years before A.D. 0001.
- * It would still fail for Feb 29, but we catch that one below.
- */
- jday = yearday; /* save for later fixup vis-a-vis Jan 1 */
- yearday -= YEAR_ADJUST;
- year = (yearday / DAYS_PER_QCENT) * 400;
- yearday %= DAYS_PER_QCENT;
- odd_cent = yearday / DAYS_PER_CENT;
- year += odd_cent * 100;
- yearday %= DAYS_PER_CENT;
- year += (yearday / DAYS_PER_QYEAR) * 4;
- yearday %= DAYS_PER_QYEAR;
- odd_year = yearday / DAYS_PER_YEAR;
- year += odd_year;
- yearday %= DAYS_PER_YEAR;
- if (!yearday && (odd_cent==4 || odd_year==4)) { /* catch Feb 29 */
- month = 1;
- yearday = 29;
- }
- else {
- yearday += YEAR_ADJUST; /* recover March 1st crock */
- month = yearday*DAYS_TO_MONTH;
- yearday -= month*MONTH_TO_DAYS;
- /* recover other leap-year adjustment */
- if (month > 13) {
- month-=14;
- year++;
- }
- else {
- month-=2;
- }
- }
- ptm->tm_year = year - 1900;
- if (yearday) {
- ptm->tm_mday = yearday;
- ptm->tm_mon = month;
- }
- else {
- ptm->tm_mday = 31;
- ptm->tm_mon = month - 1;
- }
- /* re-build yearday based on Jan 1 to get tm_yday */
- year--;
- yearday = year*DAYS_PER_YEAR + year/4 - year/100 + year/400;
- yearday += 14*MONTH_TO_DAYS + 1;
- ptm->tm_yday = jday - yearday;
- /* fix tm_wday if not overridden by caller */
- if ((unsigned)ptm->tm_wday > 6)
- ptm->tm_wday = (jday + WEEKDAY_BIAS) % 7;
-}
-
#ifdef HAS_LONG_DOUBLE
# if LONG_DOUBLESIZE > NVSIZE
# undef HAS_LONG_DOUBLE /* XXX until we figure out how to use them */
https://perl5.git.perl.org / perl5.git / blobdiff