ppath_pop
ppath_t *ppath_pop(ppath_t *, ppath_component_t **);
p = ppath_pop(p, NULL), v = npo) {
if ((p = ppath_pop(p, NULL)) == NULL) {
rp = ppath_pop(p, &rpc);
rp = ppath_pop(p, &rpc);
rp = ppath_pop(p, &rpc);
rp = ppath_pop(p, NULL);
rp = ppath_pop(cp, NULL);