check_cgmagic
int check_cgmagic(int cg, struct bufarea *cgbp);
if (!check_cgmagic(cg, cgbp))
if (!check_cgmagic(cg, cgbp)) {
if (!check_cgmagic(cg, cgbp)) {
if (!check_cgmagic(c, cgbp)) {
if (!check_cgmagic(cgx, cgbp))
if (!check_cgmagic(cg, cgbp))