nfs_adv
int nfs_adv(struct mbuf **, caddr_t *, int, int);
else if ((error = nfs_adv(mdp, dposp, len, rem)) != 0)
error = nfs_adv(mrep, dpos, rem, len);
int nfs_adv(struct mbuf **, char **, int, int);
} else if ((t1 = nfs_adv(&md, &dpos, (s), t1)) != 0) { \