roff_getstrn
if ((res = roff_getstrn(r, buf->buf + iarg,
r->current_string = roff_getstrn(r, mac, maclen, &deftype);
static const char *roff_getstrn(struct roff *,
name = roff_getstrn(r, iname, namesz, &deftype);
value = roff_getstrn(r, iname, namesz, &deftype);
name = roff_getstrn(r, iname, namesz, &deftype);
roff_getstrn(r, name, sz, &deftype);
value = roff_getstrn(r, oldn, oldsz, &deftype);