P4_NOTFOUND
p4id = (peekval == -1) ? P4_NOTFOUND : fb_pfour_id(p4reg);
case P4_NOTFOUND:
case P4_NOTFOUND:
if (p4id != P4_NOTFOUND)
case P4_NOTFOUND:
P4_NOTFOUND : fb_pfour_id(p4reg);