fillw
fillw(attr | c, vtb->vtb_buffer, vtb->vtb_size);
fillw(attr | c, vtb->vtb_buffer + at, count);
fillw(attr | c, vtb->vtb_buffer + at + len,
fillw(attr | c, vtb->vtb_buffer + at, count);
#define fillw_io(p, d, c) fillw((p), (void *)(d), (c))
void fillw(int /*u_short*/ pat, void *base, size_t cnt);