int handleprivatemsgcmd(void *source, int cargc, char **cargv);
int handleprivatenoticecmd(void *source, int cargc, char **cargv);
int handlemessageornotice(void *source, int cargc, char **cargv, int isnotice);
-void sendmessagetouser(nick *source, nick *target, char *format, ... );
-void sendsecuremessagetouser(nick *source, nick *target, char *servername, char *format, ... );
-void sendnoticetouser(nick *source, nick *target, char *format, ... );
-void killuser(nick *source, nick *target, char *format, ... );
+void sendmessagetouser(nick *source, nick *target, char *format, ... ) __attribute__ ((format (printf, 3, 4)));
+void sendsecuremessagetouser(nick *source, nick *target, char *servername, char *format, ... ) __attribute__ ((format (printf, 4, 5)));
+void sendnoticetouser(nick *source, nick *target, char *format, ... ) __attribute__ ((format (printf, 3, 4)));
+void killuser(nick *source, nick *target, char *format, ... ) __attribute__ ((format (printf, 3, 4)));
void localusersetaccount(nick *np, char *accname, unsigned long accid, u_int64_t accountflags, time_t authTS);
void localusersetumodes(nick *np, flag_t newmodes);
void sethostuser(nick *target, char *ident, char *host);