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-rw-r--r--src/ical.c232
1 files changed, 159 insertions, 73 deletions
diff --git a/src/ical.c b/src/ical.c
index b94108f..5ab6846 100644
--- a/src/ical.c
+++ b/src/ical.c
@@ -579,39 +579,57 @@ ical_chk_header(FILE * fd, char *buf, char *lstore, unsigned *lineno,
}
/*
+ * Return event type from a DTSTART/DTEND/EXDATE property.
+ */
+static ical_vevent_e ical_get_type(char *c_line)
+{
+ const char vparam[] = ";VALUE=DATE";
+ char *p;
+
+ if ((p = strstr(c_line, vparam))) {
+ p += sizeof(vparam) - 1;
+ if (*p == ':' || *p == ';')
+ return EVENT;
+ }
+
+ return APPOINTMENT;
+}
+
+/*
* iCalendar date-time format is based on the ISO 8601 complete
* representation. It should be something like : DATE 'T' TIME
* where DATE is 'YYYYMMDD' and TIME is 'HHMMSS'.
* The time and 'T' separator are optional (in the case of an day-long event).
*
- * Optionally, if the type pointer is given, specify if it is an event
- * (no time is given, meaning it is an all-day event), or an appointment
- * (time is given).
+ * The type argument is either APPOINTMENT or EVENT and the time format must
+ * agree.
*
* The timezone is not yet handled by calcurse.
*/
-static time_t ical_datetime2time_t(char *datestr, ical_vevent_e * type)
+static time_t ical_datetime2time_t(char *datestr, ical_vevent_e type)
{
- const int FORMAT_DATE = 3, FORMAT_DATETIME = 6, FORMAT_DATETIMEZ = 7;
+ const int INVALID = 0, DATE = 3, DATETIME = 6, DATETIMEZ = 7;
struct date date;
unsigned hour, min, sec;
char c;
int format;
+ EXIT_IF(type == UNDEFINED, "event type not set");
+
format = sscanf(datestr, "%04u%02u%02uT%02u%02u%02u%c",
&date.yyyy, &date.mm, &date.dd, &hour, &min, &sec, &c);
- if (format == FORMAT_DATE) {
- if (type)
- *type = EVENT;
+ if (format == DATE && strlen(datestr) > 8)
+ format = INVALID;
+ if (format == DATETIMEZ && c != 'Z')
+ format = DATETIME;
+
+ if (format == DATE && type == EVENT)
return date2sec(date, 0, 0);
- } else if (format == FORMAT_DATETIME || format == FORMAT_DATETIMEZ) {
- if (type)
- *type = APPOINTMENT;
- if (format == FORMAT_DATETIMEZ && c == 'Z')
- return utcdate2sec(date, hour, min);
- else
- return date2sec(date, hour, min);
- }
+ else if (format == DATETIME && type == APPOINTMENT)
+ return date2sec(date, hour, min);
+ else if (format == DATETIMEZ && type == APPOINTMENT)
+ return utcdate2sec(date, hour, min);
+
return 0;
}
@@ -645,15 +663,22 @@ static long ical_durtime2long(char *timestr)
}
/*
- * Extract from RFC2445:
+ * Extract from RFC2445 section 3.8.2.5:
+ *
+ * Property Name: DURATION
+ *
+ * Purpose: This property specifies a positive duration of time.
+ *
+ * Value Type: DURATION
+ *
+ * and section 3.3.6:
*
* Value Name: DURATION
*
* Purpose: This value type is used to identify properties that contain
- * duration of time.
+ * a duration of time.
*
- * Formal Definition: The value type is defined by the following
- * notation:
+ * Format Definition: The value type is defined by the following notation:
*
* dur-value = (["+"] / "-") "P" (dur-date / dur-time / dur-week)
* dur-date = dur-day [dur-time]
@@ -669,42 +694,36 @@ static long ical_durtime2long(char *timestr)
* A duration of 7 weeks would be:
* P7W
*/
-static long ical_dur2long(char *durstr)
+static long ical_dur2long(char *durstr, ical_vevent_e type)
{
- char *p;
+ char *p = durstr, c;
int bytes_read;
- struct {
- unsigned week, day;
- } date;
-
- memset(&date, 0, sizeof date);
-
- p = strchr(durstr, 'P');
- if (!p)
- return -1;
- p++;
+ unsigned week, day;
if (*p == '-')
- return -1;
+ return 0;
if (*p == '+')
p++;
+ if (*p != 'P')
+ return 0;
- if (*p == 'T') {
+ p++;
+ if (*p == 'T' && type == APPOINTMENT)
/* dur-time */
return ical_durtime2long(p);
- } else if (strchr(p, 'W')) {
+ else if (sscanf(p, "%u%c", &week, &c) == 2 && c == 'W')
/* dur-week */
- if (sscanf(p, "%u", &date.week) == 1)
- return date.week * WEEKINDAYS * DAYINSEC;
- } else if (strchr(p, 'D')) {
+ return week * WEEKINDAYS * DAYINSEC;
+ else if (sscanf(p, "%u%c%n", &day, &c, &bytes_read) == 2 && c == 'D') {
/* dur-date */
- if (sscanf(p, "%uD%n", &date.day, &bytes_read) == 1) {
- p += bytes_read;
- return date.day * DAYINSEC + ical_durtime2long(p);
- }
+ p += bytes_read;
+ if (*p == 'T' && type == APPOINTMENT)
+ return day * DAYINSEC + ical_durtime2long(p);
+ else if (*p != 'T' && type == EVENT)
+ return day * DAYINSEC;
}
- return -1;
+ return 0;
}
/*
@@ -742,8 +761,8 @@ static char *ical_get_value(char *p)
return NULL;
for (; *p != ':'; p++) {
if (*p == '"')
- for (p++; *p != '"' && *p != '\0'; p++);
- if (*p == '\0')
+ for (p++; *p && *p != '"'; p++);
+ if (!*p)
return NULL;
}
@@ -787,8 +806,10 @@ static char *ical_get_value(char *p)
* ( ";" x-name "=" text )
* )
*/
-static ical_rpt_t *ical_read_rrule(FILE * log, char *rrulestr,
- unsigned *noskipped, const int itemline)
+static ical_rpt_t *ical_read_rrule(FILE *log, char *rrulestr,
+ unsigned *noskipped,
+ const int itemline,
+ ical_vevent_e type)
{
const char count[] = "COUNT=";
const char interv[] = "INTERVAL=";
@@ -797,6 +818,12 @@ static ical_rpt_t *ical_read_rrule(FILE * log, char *rrulestr,
ical_rpt_t *rpt;
char *p;
+ /* See DTSTART. */
+ if (type == UNDEFINED) {
+ ical_log(log, ICAL_VEVENT, itemline,
+ _("need DTSTART to determine event type."));
+ return NULL;
+ }
p = ical_get_value(rrulestr);
if (!p) {
ical_log(log, ICAL_VEVENT, itemline,
@@ -842,7 +869,14 @@ static ical_rpt_t *ical_read_rrule(FILE * log, char *rrulestr,
* specified, counts as the first occurrence.
*/
if ((p = strstr(rrulestr, "UNTIL")) != NULL) {
- rpt->until = ical_datetime2time_t(strchr(p, '=') + 1, NULL);
+ rpt->until = ical_datetime2time_t(strchr(p, '=') + 1, type);
+ if (!(rpt->until)) {
+ ical_log(log, ICAL_VEVENT, itemline,
+ _("invalid until format."));
+ (*noskipped)++;
+ mem_free(rpt);
+ return NULL;
+ }
} else {
unsigned cnt;
char *countstr;
@@ -865,11 +899,8 @@ static ical_rpt_t *ical_read_rrule(FILE * log, char *rrulestr,
return rpt;
}
-static void ical_add_exc(llist_t * exc_head, long date)
+static void ical_add_exc(llist_t * exc_head, time_t date)
{
- if (date == 0)
- return;
-
struct excp *exc = mem_malloc(sizeof(struct excp));
exc->st = date;
@@ -877,15 +908,30 @@ static void ical_add_exc(llist_t * exc_head, long date)
}
/*
- * This property defines the list of date/time exceptions for a
+ * This property defines a comma-separated list of date/time exceptions for a
* recurring calendar component.
*/
static int
-ical_read_exdate(llist_t * exc, FILE * log, char *exstr,
- unsigned *noskipped, const int itemline)
+ical_read_exdate(llist_t * exc, FILE * log, char *exstr, unsigned *noskipped,
+ const int itemline, ical_vevent_e type)
{
char *p, *q;
+ time_t t;
+ int n;
+ /* See DTSTART. */
+ if (type == UNDEFINED) {
+ ical_log(log, ICAL_VEVENT, itemline,
+ _("need DTSTART to determine event type."));
+ (*noskipped)++;
+ return 0;
+ }
+ if (type != ical_get_type(exstr)) {
+ ical_log(log, ICAL_VEVENT, itemline,
+ _("invalid exception date value type."));
+ (*noskipped)++;
+ return 0;
+ }
p = ical_get_value(exstr);
if (!p) {
ical_log(log, ICAL_VEVENT, itemline,
@@ -894,16 +940,20 @@ ical_read_exdate(llist_t * exc, FILE * log, char *exstr,
return 0;
}
- while ((q = strchr(p, ',')) != NULL) {
- char buf[BUFSIZ];
- const int buflen = q - p;
-
- strncpy(buf, p, buflen);
- buf[buflen] = '\0';
- ical_add_exc(exc, ical_datetime2time_t(buf, NULL));
- p = ++q;
+ /* Count the exceptions and replace commas by zeroes */
+ for (q = p, n = 1; (q = strchr(q, ',')); *q = '\0', q++, n++)
+ ;
+ while (n) {
+ if (!(t = ical_datetime2time_t(p, type))) {
+ ical_log(log, ICAL_VEVENT, itemline,
+ _("invalid exception."));
+ (*noskipped)++;
+ return 0;
+ }
+ ical_add_exc(exc, t);
+ p = strchr(p, '\0') + 1;
+ n--;
}
- ical_add_exc(exc, ical_datetime2time_t(p, NULL));
return 1;
}
@@ -1107,6 +1157,16 @@ ical_read_event(FILE * fdi, FILE * log, unsigned *noevents,
return;
}
if (starts_with_ci(buf, "DTSTART")) {
+ /*
+ * DTSTART has a value type: either DATE-TIME (by
+ * default) or DATE. Properties DTEND, DURATION and
+ * EXDATE and rrule part UNTIL must agree.
+ * Assume that DTSTART comes before the others even
+ * though RFC 5545 allows any order.
+ * In calcurse DATE-TIME implies an appointment, DATE an
+ * event.
+ */
+ vevent_type = ical_get_type(buf);
p = ical_get_value(buf);
if (!p) {
ical_log(log, ICAL_VEVENT, ITEMLINE,
@@ -1114,13 +1174,26 @@ ical_read_event(FILE * fdi, FILE * log, unsigned *noevents,
goto skip;
}
- vevent.start = ical_datetime2time_t(p, &vevent_type);
+ vevent.start = ical_datetime2time_t(p, vevent_type);
if (!vevent.start) {
ical_log(log, ICAL_VEVENT, ITEMLINE,
- _("could not retrieve event start time."));
+ _("invalid or malformed event "
+ "start time."));
goto skip;
}
} else if (starts_with_ci(buf, "DTEND")) {
+ /* See DTSTART. */
+ if (vevent_type == UNDEFINED) {
+ ical_log(log, ICAL_VEVENT, ITEMLINE,
+ _("need DTSTART to determine "
+ "event type."));
+ goto skip;
+ }
+ if (vevent_type != ical_get_type(buf)) {
+ ical_log(log, ICAL_VEVENT, ITEMLINE,
+ _("invalid end time value type."));
+ goto skip;
+ }
p = ical_get_value(buf);
if (!p) {
ical_log(log, ICAL_VEVENT, ITEMLINE,
@@ -1128,27 +1201,40 @@ ical_read_event(FILE * fdi, FILE * log, unsigned *noevents,
goto skip;
}
- vevent.end = ical_datetime2time_t(p, &vevent_type);
+ vevent.end = ical_datetime2time_t(p, vevent_type);
if (!vevent.end) {
ical_log(log, ICAL_VEVENT, ITEMLINE,
- _("could not retrieve event end time."));
+ _("malformed event end time."));
goto skip;
}
} else if (starts_with_ci(buf, "DURATION")) {
- vevent.dur = ical_dur2long(buf);
- if (vevent.dur <= 0) {
+ /* See DTSTART. */
+ if (vevent_type == UNDEFINED) {
+ ical_log(log, ICAL_VEVENT, ITEMLINE,
+ _("need DTSTART to determine "
+ "event type."));
+ goto skip;
+ }
+ p = ical_get_value(buf);
+ if (!p) {
+ ical_log(log, ICAL_VEVENT, ITEMLINE,
+ _("malformed duration line."));
+ goto skip;
+ }
+ vevent.dur = ical_dur2long(p, vevent_type);
+ if (!vevent.dur) {
ical_log(log, ICAL_VEVENT, ITEMLINE,
- _("item duration malformed."));
+ _("invalid duration."));
goto skip;
}
} else if (starts_with_ci(buf, "RRULE")) {
vevent.rpt = ical_read_rrule(log, buf, noskipped,
- ITEMLINE);
+ ITEMLINE, vevent_type);
if (!vevent.rpt)
goto cleanup;
} else if (starts_with_ci(buf, "EXDATE")) {
if (!ical_read_exdate(&vevent.exc, log, buf, noskipped,
- ITEMLINE))
+ ITEMLINE, vevent_type))
goto cleanup;
} else if (starts_with_ci(buf, "SUMMARY")) {
vevent.mesg = ical_read_summary(buf, noskipped,
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-21 18:45:34 +0000