-void cbcp_recvreq(cbcp_state *us, char *pckt, int len);
-void cbcp_resp(cbcp_state *us);
-void cbcp_up(cbcp_state *us);
-void cbcp_recvack(cbcp_state *us, char *pckt, int len);
-void cbcp_send(cbcp_state *us, u_char code, u_char *buf, int len);
+static void cbcp_recvreq __P((cbcp_state *us, char *pckt, int len));
+static void cbcp_resp __P((cbcp_state *us));
+static void cbcp_up __P((cbcp_state *us));
+static void cbcp_recvack __P((cbcp_state *us, char *pckt, int len));
+static void cbcp_send __P((cbcp_state *us, u_char code, u_char *buf, int len));