/* interval2tm()
* Convert an interval data type to a tm structure.
*/
static int
interval2tm(interval span, struct tm * tm, fsec_t *fsec)
{
#ifdef HAVE_INT64_TIMESTAMP
int64 time;
#else
double time;
#endif
if (span.month != 0)
{
tm->tm_year = span.month / MONTHS_PER_YEAR;
tm->tm_mon = span.month % MONTHS_PER_YEAR;
}
else
{
tm->tm_year = 0;
tm->tm_mon = 0;
}
time = span.time;
#ifdef HAVE_INT64_TIMESTAMP
tm->tm_mday = time / USECS_PER_DAY;
time -= tm->tm_mday * USECS_PER_DAY;
tm->tm_hour = time / USECS_PER_HOUR;
time -= tm->tm_hour * USECS_PER_HOUR;
tm->tm_min = time / USECS_PER_MINUTE;
time -= tm->tm_min * USECS_PER_MINUTE;
tm->tm_sec = time / USECS_PER_SEC;
*fsec = time - (tm->tm_sec * USECS_PER_SEC);
#else
recalc:
TMODULO(time, tm->tm_mday, (double) SECS_PER_DAY);
TMODULO(time, tm->tm_hour, (double) SECS_PER_HOUR);
TMODULO(time, tm->tm_min, (double) SECS_PER_MINUTE);
TMODULO(time, tm->tm_sec, 1.0);
time = TSROUND(time);
/* roundoff may need to propagate to higher-order fields */
if (time >= 1.0)
{
time = ceil(span.time);
goto recalc;
}
*fsec = time;
#endif
return 0;
} /* interval2tm() */
/* timestamp2tm()
* Convert timestamp data type to POSIX time structure.
* Note that year is _not_ 1900-based, but is an explicit full value.
* Also, month is one-based, _not_ zero-based.
* Returns:
* 0 on success
* -1 on out of range
*
* For dates within the system-supported time_t range, convert to the
* local time zone. If out of this range, leave as GMT. - tgl 97/05/27
*/
static int
timestamp2tm(timestamp dt, int *tzp, struct tm * tm, fsec_t *fsec, char **tzn)
{
#ifdef HAVE_INT64_TIMESTAMP
int64 dDate,
date0;
int64 time;
#else
double dDate,
date0;
double time;
#endif
time_t utime;
#if defined(HAVE_TM_ZONE) || defined(HAVE_INT_TIMEZONE)
struct tm *tx;
#endif
date0 = date2j(2000, 1, 1);
#ifdef HAVE_INT64_TIMESTAMP
time = dt;
TMODULO(time, dDate, USECS_PER_DAY);
if (time < INT64CONST(0))
{
time += USECS_PER_DAY;
dDate -= 1;
}
/* add offset to go from J2000 back to standard Julian date */
dDate += date0;
/* Julian day routine does not work for negative Julian days */
if (dDate < 0 || dDate > (timestamp) INT_MAX)
return -1;
j2date((int) dDate, &tm->tm_year, &tm->tm_mon, &tm->tm_mday);
dt2time(time, &tm->tm_hour, &tm->tm_min, &tm->tm_sec, fsec);
#else
time = dt;
TMODULO(time, dDate, (double) SECS_PER_DAY);
if (time < 0)
{
time += SECS_PER_DAY;
dDate -= 1;
}
/* add offset to go from J2000 back to standard Julian date */
dDate += date0;
recalc_d:
/* Julian day routine does not work for negative Julian days */
if (dDate < 0 || dDate > (timestamp) INT_MAX)
return -1;
j2date((int) dDate, &tm->tm_year, &tm->tm_mon, &tm->tm_mday);
recalc_t:
dt2time(time, &tm->tm_hour, &tm->tm_min, &tm->tm_sec, fsec);
*fsec = TSROUND(*fsec);
/* roundoff may need to propagate to higher-order fields */
if (*fsec >= 1.0)
{
time = ceil(time);
if (time >= (double) SECS_PER_DAY)
{
time = 0;
dDate += 1;
goto recalc_d;
}
goto recalc_t;
}
#endif
if (tzp != NULL)
{
/*
* Does this fall within the capabilities of the localtime()
* interface? Then use this to rotate to the local time zone.
*/
if (IS_VALID_UTIME(tm->tm_year, tm->tm_mon, tm->tm_mday))
{
#ifdef HAVE_INT64_TIMESTAMP
utime = dt / USECS_PER_SEC +
((date0 - date2j(1970, 1, 1)) * INT64CONST(86400));
#else
utime = dt + (date0 - date2j(1970, 1, 1)) * SECS_PER_DAY;
#endif
#if defined(HAVE_TM_ZONE) || defined(HAVE_INT_TIMEZONE)
tx = localtime(&utime);
tm->tm_year = tx->tm_year + 1900;
tm->tm_mon = tx->tm_mon + 1;
tm->tm_mday = tx->tm_mday;
tm->tm_hour = tx->tm_hour;
tm->tm_min = tx->tm_min;
tm->tm_isdst = tx->tm_isdst;
#if defined(HAVE_TM_ZONE)
tm->tm_gmtoff = tx->tm_gmtoff;
tm->tm_zone = tx->tm_zone;
*tzp = -tm->tm_gmtoff; /* tm_gmtoff is Sun/DEC-ism */
if (tzn != NULL)
*tzn = (char *) tm->tm_zone;
#elif defined(HAVE_INT_TIMEZONE)
*tzp = (tm->tm_isdst > 0) ? TIMEZONE_GLOBAL - SECS_PER_HOUR : TIMEZONE_GLOBAL;
if (tzn != NULL)
*tzn = TZNAME_GLOBAL[(tm->tm_isdst > 0)];
#endif
#else /* not (HAVE_TM_ZONE || HAVE_INT_TIMEZONE) */
*tzp = 0;
/* Mark this as *no* time zone available */
tm->tm_isdst = -1;
if (tzn != NULL)
*tzn = NULL;
#endif
dt = dt2local(dt, *tzp);
}
else
{
*tzp = 0;
/* Mark this as *no* time zone available */
tm->tm_isdst = -1;
if (tzn != NULL)
*tzn = NULL;
}
}
else
{
tm->tm_isdst = -1;
if (tzn != NULL)
*tzn = NULL;
}
return 0;
} /* timestamp2tm() */
/*
* timestamp2tm() - Convert timestamp data type to POSIX time structure.
*
* Note that year is _not_ 1900-based, but is an explicit full value.
* Also, month is one-based, _not_ zero-based.
* Returns:
* 0 on success
* -1 on out of range
*
* If attimezone is NULL, the global timezone (including possibly brute forced
* timezone) will be used.
*/
int
timestamp2tm(Timestamp dt, int *tzp, struct tm *tm, fsec_t *fsec, const char **tzn, pg_tz *attimezone)
{
Timestamp date;
Timestamp time;
pg_time_t utime;
/*
* If HasCTZSet is true then we have a brute force time zone specified. Go
* ahead and rotate to the local time zone since we will later bypass any
* calls which adjust the tm fields.
*/
if (attimezone == NULL && HasCTZSet && tzp != NULL)
{
#ifdef HAVE_INT64_TIMESTAMP
dt -= CTimeZone * USECS_PER_SEC;
#else
dt -= CTimeZone;
#endif
}
#ifdef HAVE_INT64_TIMESTAMP
time = dt;
TMODULO(time, date, USECS_PER_DAY);
if (time < INT64CONST(0))
{
time += USECS_PER_DAY;
date -= 1;
}
/* add offset to go from J2000 back to standard Julian date */
date += POSTGRES_EPOCH_JDATE;
/* Julian day routine does not work for negative Julian days */
if (date < 0 || date > (Timestamp) INT_MAX)
return -1;
j2date((int) date, &tm->tm_year, &tm->tm_mon, &tm->tm_mday);
dt2time(time, &tm->tm_hour, &tm->tm_min, &tm->tm_sec, fsec);
#else
time = dt;
TMODULO(time, date, (double) SECS_PER_DAY);
if (time < 0)
{
time += SECS_PER_DAY;
date -= 1;
}
/* add offset to go from J2000 back to standard Julian date */
date += POSTGRES_EPOCH_JDATE;
recalc_d:
/* Julian day routine does not work for negative Julian days */
if (date < 0 || date > (Timestamp) INT_MAX)
return -1;
j2date((int) date, &tm->tm_year, &tm->tm_mon, &tm->tm_mday);
recalc_t:
dt2time(time, &tm->tm_hour, &tm->tm_min, &tm->tm_sec, fsec);
*fsec = TSROUND(*fsec);
/* roundoff may need to propagate to higher-order fields */
if (*fsec >= 1.0)
{
time = ceil(time);
if (time >= (double) SECS_PER_DAY)
{
time = 0;
date += 1;
goto recalc_d;
}
goto recalc_t;
}
#endif
/* Done if no TZ conversion wanted */
if (tzp == NULL)
{
tm->tm_isdst = -1;
tm->tm_gmtoff = 0;
tm->tm_zone = NULL;
if (tzn != NULL)
*tzn = NULL;
return 0;
}
/*
* We have a brute force time zone per SQL99? Then use it without change
* since we have already rotated to the time zone.
*/
if (attimezone == NULL && HasCTZSet)
{
*tzp = CTimeZone;
tm->tm_isdst = 0;
tm->tm_gmtoff = CTimeZone;
tm->tm_zone = NULL;
if (tzn != NULL)
*tzn = NULL;
return 0;
}
/*
* If the time falls within the range of pg_time_t, use pg_localtime() to
* rotate to the local time zone.
*
* First, convert to an integral timestamp, avoiding possibly
* platform-specific roundoff-in-wrong-direction errors, and adjust to
* Unix epoch. Then see if we can convert to pg_time_t without loss. This
* coding avoids hardwiring any assumptions about the width of pg_time_t,
* so it should behave sanely on machines without int64_t.
*/
#ifdef HAVE_INT64_TIMESTAMP
dt = (dt - *fsec) / USECS_PER_SEC +
(POSTGRES_EPOCH_JDATE - UNIX_EPOCH_JDATE) * SECS_PER_DAY;
#else
dt = rint(dt - *fsec +
(POSTGRES_EPOCH_JDATE - UNIX_EPOCH_JDATE) * SECS_PER_DAY);
#endif
utime = (pg_time_t) dt;
if ((Timestamp) utime == dt)
{
struct tm *tx = pg_localtime(&utime,
attimezone ? attimezone : session_timezone);
tm->tm_year = tx->tm_year + 1900;
tm->tm_mon = tx->tm_mon + 1;
tm->tm_mday = tx->tm_mday;
tm->tm_hour = tx->tm_hour;
tm->tm_min = tx->tm_min;
tm->tm_sec = tx->tm_sec;
tm->tm_isdst = tx->tm_isdst;
tm->tm_gmtoff = tx->tm_gmtoff;
tm->tm_zone = tx->tm_zone;
*tzp = -tm->tm_gmtoff;
if (tzn != NULL)
*tzn = tm->tm_zone;
}
else
{
/*
* When out of range of pg_time_t, treat as GMT
*/
*tzp = 0;
/* Mark this as *no* time zone available */
tm->tm_isdst = -1;
tm->tm_gmtoff = 0;
tm->tm_zone = NULL;
if (tzn != NULL)
*tzn = NULL;
}
return 0;
}
