+const void *
+change_isupport(const char *name, const char *(*func)(const void *), const void *param)
+{
+ rb_dlink_node *ptr;
+ struct isupportitem *item;
+ const void *oldvalue;
+
+ RB_DLINK_FOREACH(ptr, isupportlist.head)
+ {
+ item = ptr->data;
+
+ if (!strcmp(item->name, name))
+ {
+ oldvalue = item->param;
+
+ // item->name = name;
+ item->func = func;
+ item->param = param;
+
+ break;
+ }
+ }
+
+ return oldvalue;
+}
+