4 * Function to go through an ical component set and convert all non-UTC
5 * date/time properties to UTC. It also strips out any VTIMEZONE
6 * subcomponents afterwards, because they're irrelevant.
12 #include <sys/types.h>
19 #ifdef WEBCIT_WITH_CALENDAR_SERVICE
23 * Back end function for ical_dezonify()
25 * We supply this with the master component, the relevant component,
26 * and the property (which will be a DTSTART, DTEND, etc.)
27 * which we want to convert to UTC.
29 void ical_dezonify_backend(icalcomponent *cal,
33 icaltimezone *t = NULL;
36 struct icaltimetype TheTime;
38 /* Give me nothing and I will give you nothing in return. */
39 if (cal == NULL) return;
41 /* Hunt for a TZID parameter in this property. */
42 param = icalproperty_get_first_parameter(prop, ICAL_TZID_PARAMETER);
44 /* Get the stringish name of this TZID. */
46 tzid = icalparameter_get_tzid(param);
48 /* Convert it to an icaltimezone type. */
50 t = icalcomponent_get_timezone(cal, tzid);
55 /* Now we know the timezone. Convert to UTC. */
57 if (icalproperty_isa(prop) == ICAL_DTSTART_PROPERTY) {
58 TheTime = icalproperty_get_dtstart(prop);
60 else if (icalproperty_isa(prop) == ICAL_DTEND_PROPERTY) {
61 TheTime = icalproperty_get_dtend(prop);
63 else if (icalproperty_isa(prop) == ICAL_DUE_PROPERTY) {
64 TheTime = icalproperty_get_due(prop);
66 else if (icalproperty_isa(prop) == ICAL_EXDATE_PROPERTY) {
67 TheTime = icalproperty_get_exdate(prop);
73 /* Do the conversion. */
75 icaltimezone_convert_time(&TheTime,
77 icaltimezone_get_utc_timezone()
81 icalproperty_remove_parameter_by_kind(prop, ICAL_TZID_PARAMETER);
83 /* Now add the converted property back in. */
84 if (icalproperty_isa(prop) == ICAL_DTSTART_PROPERTY) {
85 icalproperty_set_dtstart(prop, TheTime);
87 else if (icalproperty_isa(prop) == ICAL_DTEND_PROPERTY) {
88 icalproperty_set_dtend(prop, TheTime);
90 else if (icalproperty_isa(prop) == ICAL_DUE_PROPERTY) {
91 icalproperty_set_due(prop, TheTime);
93 else if (icalproperty_isa(prop) == ICAL_EXDATE_PROPERTY) {
94 icalproperty_set_exdate(prop, TheTime);
100 * Recursive portion of ical_dezonify()
102 void ical_dezonify_recur(icalcomponent *cal, icalcomponent *rcal) {
107 * Recurse through all subcomponents *except* VTIMEZONE ones.
109 for (c=icalcomponent_get_first_component(
110 rcal, ICAL_ANY_COMPONENT);
112 c = icalcomponent_get_next_component(
113 rcal, ICAL_ANY_COMPONENT)
115 if (icalcomponent_isa(c) != ICAL_VTIMEZONE_COMPONENT) {
116 ical_dezonify_recur(cal, c);
121 * Now look for DTSTART and DTEND properties
123 for (p=icalcomponent_get_first_property(
124 rcal, ICAL_ANY_PROPERTY);
126 p = icalcomponent_get_next_property(
127 rcal, ICAL_ANY_PROPERTY)
130 (icalproperty_isa(p) == ICAL_DTSTART_PROPERTY)
131 || (icalproperty_isa(p) == ICAL_DTEND_PROPERTY)
132 || (icalproperty_isa(p) == ICAL_DUE_PROPERTY)
133 || (icalproperty_isa(p) == ICAL_EXDATE_PROPERTY)
135 ical_dezonify_backend(cal, rcal, p);
142 * Convert all DTSTART and DTEND properties in all subcomponents to UTC.
143 * This function will search any VTIMEZONE subcomponents to learn the
144 * relevant timezone information.
146 void ical_dezonify(icalcomponent *cal) {
147 icalcomponent *vt = NULL;
149 /* Convert all times to UTC */
150 ical_dezonify_recur(cal, cal);
152 /* Strip out VTIMEZONE subcomponents -- we don't need them anymore */
153 while (vt = icalcomponent_get_first_component(
154 cal, ICAL_VTIMEZONE_COMPONENT), vt != NULL) {
155 icalcomponent_remove_component(cal, vt);
156 icalcomponent_free(vt);
162 #endif /* WEBCIT_WITH_CALENDAR_SERVICE */