+notmuch_status_t
+notmuch_message_count_properties (notmuch_message_t *message, const char *key, unsigned int *count)
+{
+ if (! count || ! key || ! message)
+ return NOTMUCH_STATUS_NULL_POINTER;
+
+ notmuch_string_map_t *map;
+ map = _notmuch_message_property_map (message);
+ if (! map)
+ return NOTMUCH_STATUS_NULL_POINTER;
+
+ notmuch_string_map_iterator_t *matcher = _notmuch_string_map_iterator_create (map, key, true);
+ if (! matcher)
+ return NOTMUCH_STATUS_OUT_OF_MEMORY;
+
+ *count = 0;
+ while (_notmuch_string_map_iterator_valid (matcher)) {
+ (*count)++;
+ _notmuch_string_map_iterator_move_to_next (matcher);
+ }
+
+ _notmuch_string_map_iterator_destroy (matcher);
+ return NOTMUCH_STATUS_SUCCESS;
+}
+