calc_nnode_num_from_parent
int num = calc_nnode_num_from_parent(c, parent, iip);
nnode->num = calc_nnode_num_from_parent(c, parent, iip);
nnode->num = calc_nnode_num_from_parent(c, parent, iip);
nnode->num = calc_nnode_num_from_parent(c, parent, iip);
nnode->num = calc_nnode_num_from_parent(c, parent, iip);