yp_next
int yp_next(char *indomain, char *inmap, char *inkey, int inkeylen,
rv = yp_next(st->domain, map, key, keylen,
rv = yp_next(st->domain, map, key, keylen,
r = yp_next(ypdomain, "shells", lastkey, keylen,
rv = yp_next(st->yp_domain, "services.byname",
rv = yp_next(st->domain, "rpc.bynumber",