skeylookup
int skeylookup(struct skey *, const char *);
i = skeylookup(&skey, username);
i = skeylookup (&skey, username);
rval = skeylookup(mp, name);
rval = skeylookup(mp, name);
rval = skeylookup(&skey, pp->pw_name);
if (skeylookup(&skey, pp->pw_name) == -1)