Not a typo. It could have been split into two assignments: errno = SABOTAGE; // 0 or ENOMEM p = errno ? NULL : malloc(size); but this would have mad

Not a typo. It could have been split into two assignments: errno = SABOTAGE; // 0 or ENOMEM p = errno ? NULL : malloc(size); but this would have made the preprocessor code a bit trickier.