print_opcode
cmd = print_opcode(bp, fo, state, ip4 > ip6 ? O_IP4: O_IP6);
cmd = print_opcode(bp, fo, state, ip4 > ip6 ? O_IP6: O_IP4);
cmd = print_opcode(bp, fo, state, O_PROTO);
cmd = print_opcode(bp, fo, &state, O_PROB);
while (print_opcode(bp, fo, &state, -1))
cmd = print_opcode(bp, fo, &state, O_NOP);
void print_opcode(const char *, int, uint32_t);