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Also removed the function not just the call, sorry.
This commit is contained in:
Michael Meskes
parent
439cf8e676
commit
9ab58bbda6
@ -1,4 +1,4 @@
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/* $PostgreSQL: pgsql/src/interfaces/ecpg/pgtypeslib/dt_common.c,v 1.39 2007/05/21 07:04:00 meskes Exp $ */
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/* $PostgreSQL: pgsql/src/interfaces/ecpg/pgtypeslib/dt_common.c,v 1.40 2007/05/21 07:07:48 meskes Exp $ */
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#include "postgres_fe.h"
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@ -1090,159 +1090,6 @@ GetCurrentDateTime(struct tm * tm)
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abstime2tm(time(NULL), &tz, tm, NULL);
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}
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/* DetermineLocalTimeZone()
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*
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* Given a struct tm in which tm_year, tm_mon, tm_mday, tm_hour, tm_min, and
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* tm_sec fields are set, attempt to determine the applicable local zone
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* (ie, regular or daylight-savings time) at that time. Set the struct tm's
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* tm_isdst field accordingly, and return the actual timezone offset.
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*
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* This subroutine exists to centralize uses of mktime() and defend against
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* mktime() bugs/restrictions on various platforms. This should be
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* the *only* call of mktime() in the backend.
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*/
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static int
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DetermineLocalTimeZone(struct tm * tm)
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{
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int tz;
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if (IS_VALID_UTIME(tm->tm_year, tm->tm_mon, tm->tm_mday))
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{
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#if defined(HAVE_TM_ZONE) || defined(HAVE_INT_TIMEZONE)
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/*
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* Some buggy mktime() implementations may change the year/month/day
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* when given a time right at a DST boundary. To prevent corruption
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* of the caller's data, give mktime() a copy...
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*/
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struct tm tt,
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*tmp = &tt;
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*tmp = *tm;
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/* change to Unix conventions for year/month */
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tmp->tm_year -= 1900;
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tmp->tm_mon -= 1;
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/* indicate timezone unknown */
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tmp->tm_isdst = -1;
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if (mktime(tmp) != (time_t) -1 && tmp->tm_isdst >= 0)
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{
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/* mktime() succeeded, trust its result */
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tm->tm_isdst = tmp->tm_isdst;
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#if defined(HAVE_TM_ZONE)
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/* tm_gmtoff is Sun/DEC-ism */
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tz = -tmp->tm_gmtoff;
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#elif defined(HAVE_INT_TIMEZONE)
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tz = (tmp->tm_isdst > 0) ? TIMEZONE_GLOBAL - SECS_PER_HOUR : TIMEZONE_GLOBAL;
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#endif /* HAVE_INT_TIMEZONE */
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}
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else
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{
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/*
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* We have a buggy (not to say deliberately brain damaged)
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* mktime(). Work around it by using localtime() instead.
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*
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* First, generate the time_t value corresponding to the given
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* y/m/d/h/m/s taken as GMT time. This will not overflow (at
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* least not for time_t taken as signed) because of the range
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* check we did above.
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*/
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long day,
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mysec,
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locsec,
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delta1,
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delta2;
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time_t mytime;
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day = (date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) -
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date2j(1970, 1, 1));
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mysec = tm->tm_sec + (tm->tm_min + (day * HOURS_PER_DAY + tm->tm_hour) * MINS_PER_HOUR) * SECS_PER_MINUTE;
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mytime = (time_t) mysec;
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/*
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* Use localtime to convert that time_t to broken-down time, and
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* reassemble to get a representation of local time.
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*/
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tmp = localtime(&mytime);
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if (!tmp)
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{
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tm->tm_isdst = 0;
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return 0;
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}
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day = (date2j(tmp->tm_year + 1900, tmp->tm_mon + 1, tmp->tm_mday) -
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date2j(1970, 1, 1));
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locsec = tmp->tm_sec + (tmp->tm_min + (day * HOURS_PER_DAY + tmp->tm_hour) * MINS_PER_HOUR) * SECS_PER_MINUTE;
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/*
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* The local time offset corresponding to that GMT time is now
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* computable as mysec - locsec.
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*/
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delta1 = mysec - locsec;
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/*
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* However, if that GMT time and the local time we are actually
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* interested in are on opposite sides of a daylight-savings-time
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* transition, then this is not the time offset we want. So,
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* adjust the time_t to be what we think the GMT time
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* corresponding to our target local time is, and repeat the
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* localtime() call and delta calculation. We may have to do it
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* twice before we have a trustworthy delta.
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*
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* Note: think not to put a loop here, since if we've been given
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* an "impossible" local time (in the gap during a spring-forward
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* transition) we'd never get out of the loop. Twice is enough to
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* give the behavior we want, which is that "impossible" times are
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* taken as standard time, while at a fall-back boundary ambiguous
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* times are also taken as standard.
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*/
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mysec += delta1;
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mytime = (time_t) mysec;
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tmp = localtime(&mytime);
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if (!tmp)
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{
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tm->tm_isdst = 0;
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return 0;
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}
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day = (date2j(tmp->tm_year + 1900, tmp->tm_mon + 1, tmp->tm_mday) -
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date2j(1970, 1, 1));
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locsec = tmp->tm_sec + (tmp->tm_min + (day * HOURS_PER_DAY + tmp->tm_hour) * MINS_PER_HOUR) * SECS_PER_MINUTE;
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delta2 = mysec - locsec;
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if (delta2 != delta1)
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{
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mysec += (delta2 - delta1);
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mytime = (time_t) mysec;
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tmp = localtime(&mytime);
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if (!tmp)
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{
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tm->tm_isdst = 0;
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return 0;
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}
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day = (date2j(tmp->tm_year + 1900, tmp->tm_mon + 1, tmp->tm_mday) -
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date2j(1970, 1, 1));
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locsec = tmp->tm_sec + (tmp->tm_min + (day * HOURS_PER_DAY + tmp->tm_hour) * MINS_PER_HOUR) * SECS_PER_MINUTE;
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delta2 = mysec - locsec;
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}
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tm->tm_isdst = tmp->tm_isdst;
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tz = (int) delta2;
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}
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#else /* not (HAVE_TM_ZONE || HAVE_INT_TIMEZONE) */
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/* Assume UTC if no system timezone info available */
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tm->tm_isdst = 0;
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tz = 0;
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#endif
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}
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else
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{
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/* Given date is out of range, so assume UTC */
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tm->tm_isdst = 0;
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tz = 0;
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}
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return tz;
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}
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static void
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dt2time(double jd, int *hour, int *min, int *sec, fsec_t *fsec)
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{
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