void CtdlGetRelationship(visit *vbuf, struct ctdluser *rel_user, struct ctdlroom *rel_room);
void CtdlSetRelationship(visit *newvisit, struct ctdluser *rel_user, struct ctdlroom *rel_room);
void CtdlMailboxName(char *buf, size_t n, const struct ctdluser *who, const char *prefix);
-int CtdlLoginExistingUser(char *authname, const char *username);
+int CtdlLoginExistingUser(const char *username);
/*
* Values which may be returned by CtdlLoginExistingUser()