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>
24 * Back end function for ical_dezonify()
26 * We supply this with the master component, the relevant component,
27 * and the property (which will be a DTSTART, DTEND, etc.)
28 * which we want to convert to UTC.
30 void ical_dezonify_backend(icalcomponent *cal,
37 struct icaltimetype TheTime;
39 /* Give me nothing and I will give you nothing in return. */
40 if (cal == NULL) return;
42 /* Hunt for a TZID parameter in this property. */
43 param = icalproperty_get_first_parameter(prop, ICAL_TZID_PARAMETER);
44 if (param == NULL) return;
46 /* Get the stringish name of this TZID. */
47 tzid = icalparameter_get_tzid(param);
48 if (tzid == NULL) return;
50 /* Convert it to an icaltimezone type. */
51 t = icalcomponent_get_timezone(cal, tzid);
52 if (t == NULL) return;
54 /* Now we know the timezone. Convert to UTC. */
56 if (icalproperty_isa(prop) == ICAL_DTSTART_PROPERTY) {
57 TheTime = icalproperty_get_dtstart(prop);
59 else if (icalproperty_isa(prop) == ICAL_DTEND_PROPERTY) {
60 TheTime = icalproperty_get_dtend(prop);
62 else if (icalproperty_isa(prop) == ICAL_DUE_PROPERTY) {
63 TheTime = icalproperty_get_due(prop);
65 else if (icalproperty_isa(prop) == ICAL_EXDATE_PROPERTY) {
66 TheTime = icalproperty_get_exdate(prop);
72 /* Do the conversion. */
73 icaltimezone_convert_time(&TheTime,
75 icaltimezone_get_utc_timezone()
78 icalproperty_remove_parameter_by_kind(prop, ICAL_TZID_PARAMETER);
80 /* Now add the converted property back in. */
81 if (icalproperty_isa(prop) == ICAL_DTSTART_PROPERTY) {
82 icalproperty_set_dtstart(prop, TheTime);
84 else if (icalproperty_isa(prop) == ICAL_DTEND_PROPERTY) {
85 icalproperty_set_dtend(prop, TheTime);
87 else if (icalproperty_isa(prop) == ICAL_DUE_PROPERTY) {
88 icalproperty_set_due(prop, TheTime);
90 else if (icalproperty_isa(prop) == ICAL_EXDATE_PROPERTY) {
91 icalproperty_set_exdate(prop, TheTime);
97 * Recursive portion of ical_dezonify()
99 void ical_dezonify_recur(icalcomponent *cal, icalcomponent *rcal) {
104 * Recurse through all subcomponents *except* VTIMEZONE ones.
106 for (c=icalcomponent_get_first_component(
107 rcal, ICAL_ANY_COMPONENT);
109 c = icalcomponent_get_next_component(
110 rcal, ICAL_ANY_COMPONENT)
112 if (icalcomponent_isa(c) != ICAL_VTIMEZONE_COMPONENT) {
113 ical_dezonify_recur(cal, c);
118 * Now look for DTSTART and DTEND properties
120 for (p=icalcomponent_get_first_property(
121 rcal, ICAL_ANY_PROPERTY);
123 p = icalcomponent_get_next_property(
124 rcal, ICAL_ANY_PROPERTY)
127 (icalproperty_isa(p) == ICAL_DTSTART_PROPERTY)
128 || (icalproperty_isa(p) == ICAL_DTEND_PROPERTY)
129 || (icalproperty_isa(p) == ICAL_DUE_PROPERTY)
130 || (icalproperty_isa(p) == ICAL_EXDATE_PROPERTY)
132 ical_dezonify_backend(cal, rcal, p);
139 * Convert all DTSTART and DTEND properties in all subcomponents to UTC.
140 * This function will search any VTIMEZONE subcomponents to learn the
141 * relevant timezone information.
143 void ical_dezonify(icalcomponent *cal) {
144 icalcomponent *vt = NULL;
146 /* Convert all times to UTC */
147 ical_dezonify_recur(cal, cal);
149 /* Strip out VTIMEZONE subcomponents -- we don't need them anymore */
150 while (vt = icalcomponent_get_first_component(
151 cal, ICAL_VTIMEZONE_COMPONENT), vt != NULL) {
152 icalcomponent_remove_component(cal, vt);
153 icalcomponent_free(vt);
159 #endif /* HAVE_ICAL_H */