enprintf
enprintf(("FilterPacket(%p, %p, %p, %p):\n", pp, pfp, fp, fpe));
enprintf(("=>0(len)\n"));
enprintf(("BRTR: fp>=fpe\n"));
enprintf(("BRFL: fp>=fpe\n"));
enprintf(("stack underflow\n"));
enprintf(("=>0(--sp)\n"));
enprintf(("=>0(sp++)\n"));
enprintf(("=>0(def)\n"));
enprintf(("=>COR %x\n", *sp));
enprintf(("=>CAND %x\n", *sp));
enprintf(("=>COR %x\n", *sp));
enprintf(("=>CNAND %x\n", *sp));
enprintf(("=>%x\n", *sp));