Peter,
That is the result of ignoring the fact that this is a '51 and "regardless of what a 51 is, this one will be ANSI C" I have seen that before from another source, virtually everything you mention was there as well.

The programmers (if we can call them that) that insist on programming the '51 in C without any knowledge of what a '51 is should go home and play with their PCs.

Erik