/**
* g_time_zone_adjust_time:
* @tz: a #GTimeZone
* @type: the #GTimeType of @time
* @time: a pointer to a number of seconds since January 1, 1970
*
* Finds an interval within @tz that corresponds to the given @time,
* possibly adjusting @time if required to fit into an interval.
* The meaning of @time depends on @type.
*
* This function is similar to g_time_zone_find_interval(), with the
* difference that it always succeeds (by making the adjustments
* described below).
*
* In any of the cases where g_time_zone_find_interval() succeeds then
* this function returns the same value, without modifying @time.
*
* This function may, however, modify @time in order to deal with
* non-existent times. If the non-existent local @time of 02:30 were
* requested on March 13th 2010 in Toronto then this function would
* adjust @time to be 03:00 and return the interval containing the
* adjusted time.
*
* Returns: the interval containing @time, never -1
*
* Since: 2.26
**/
gint
g_time_zone_adjust_time (GTimeZone *tz,
GTimeType type,
gint64 *time)
{
gint i;
if (tz->zoneinfo == NULL)
return 0;
/* find the interval containing *time UTC
* TODO: this could be binary searched (or better) */
for (i = 0; i < tz->timecnt; i++)
if (*time <= interval_end (tz, i))
break;
g_assert (interval_start (tz, i) <= *time && *time <= interval_end (tz, i));
if (type != G_TIME_TYPE_UNIVERSAL)
{
if (*time < interval_local_start (tz, i))
/* if time came before the start of this interval... */
{
i--;
/* if it's not in the previous interval... */
if (*time > interval_local_end (tz, i))
{
/* it doesn't exist. fast-forward it. */
i++;
*time = interval_local_start (tz, i);
}
}
else if (*time > interval_local_end (tz, i))
/* if time came after the end of this interval... */
{
i++;
/* if it's not in the next interval... */
if (*time < interval_local_start (tz, i))
/* it doesn't exist. fast-forward it. */
*time = interval_local_start (tz, i);
}
else if (interval_isdst (tz, i) != type)
/* it's in this interval, but dst flag doesn't match.
* check neighbours for a better fit. */
{
if (i && *time <= interval_local_end (tz, i - 1))
i--;
else if (i < tz->timecnt &&
*time >= interval_local_start (tz, i + 1))
i++;
}
}
return i;
}
inline static gint64
interval_local_start (GTimeZone *tz,
gint interval)
{
if (interval)
return interval_start (tz, interval) + interval_offset (tz, interval);
return G_MININT64;
}
// --- p_start -----------------------------------------------------------------
unsigned long
p_start (unsigned long ps, unsigned long s, unsigned long pi) {
return ps == 0 ? interval_start (s, pi) : ps;
}