+
+
+
+
+/*
+ * Check to see if two events overlap. Returns nonzero if they do.
+ * (This function is used in both Citadel and WebCit. If you change it in
+ * one place, change it in the other. Better yet, put it in a library.)
+ */
+int ical_ctdl_is_overlap(
+ struct icaltimetype t1start,
+ struct icaltimetype t1end,
+ struct icaltimetype t2start,
+ struct icaltimetype t2end
+) {
+
+ if (icaltime_is_null_time(t1start)) return(0);
+ if (icaltime_is_null_time(t2start)) return(0);
+
+ /* First, check for all-day events */
+ if (t1start.is_date) {
+ if (!icaltime_compare_date_only(t1start, t2start)) {
+ return(1);
+ }
+ if (!icaltime_is_null_time(t2end)) {
+ if (!icaltime_compare_date_only(t1start, t2end)) {
+ return(1);
+ }
+ }
+ }
+
+ if (t2start.is_date) {
+ if (!icaltime_compare_date_only(t2start, t1start)) {
+ return(1);
+ }
+ if (!icaltime_is_null_time(t1end)) {
+ if (!icaltime_compare_date_only(t2start, t1end)) {
+ return(1);
+ }
+ }
+ }
+
+ /* Now check for overlaps using date *and* time. */
+
+ /* First, bail out if either event 1 or event 2 is missing end time. */
+ if (icaltime_is_null_time(t1end)) return(0);
+ if (icaltime_is_null_time(t2end)) return(0);
+
+ /* If event 1 ends before event 2 starts, we're in the clear. */
+ if (icaltime_compare(t1end, t2start) <= 0) return(0);
+
+ /* If event 2 ends before event 1 starts, we're also ok. */
+ if (icaltime_compare(t2end, t1start) <= 0) return(0);
+
+ /* Otherwise, they overlap. */
+ return(1);
+}
+
+
+
+
+
+
+
/*
* Back end function for check_attendee_availability()
* This one checks an individual attendee against a supplied
icalcomponent *fbc = NULL;
icalcomponent *fb = NULL;
icalproperty *thisfb = NULL;
+ struct icalperiodtype period;
/* Set to 'unknown' right from the beginning. Unless we learn
* something else, that's what we'll go with.
for (thisfb = icalcomponent_get_first_property(fb, ICAL_FREEBUSY_PROPERTY);
thisfb != NULL;
thisfb = icalcomponent_get_next_property(fb, ICAL_FREEBUSY_PROPERTY) ) {
-
- /* FIXME ... do the check */
+
+ /* Do the check */
+ period = icalproperty_get_freebusy(thisfb);
+ if (ical_ctdl_is_overlap(period.start, period.end,
+ event_start, event_end)) {
+ strcpy(annotation, "BUSY");
+ }
}
}
+
/*
* Check the availability of all attendees for an event (when possible)
* and annotate accordingly.
return;
}
+ ical_dezonify(vevent); /* Convert everything to UTC */
+
/*
* Learn the start and end times.
*/