dmtozs
(void) zsmctl(zs, dmtozs(*(int *)mp->b_cont->b_rptr),
(void) zsmctl(zs, dmtozs(*(int *)mp->b_cont->b_rptr),
(void) zsmctl(zs, dmtozs(*(int *)mp->b_cont->b_rptr),
(void) zsmctl(zs, dmtozs(mlines), DMSET);
(void) zsmctl(zs, dmtozs(mlines), DMBIS);
(void) zsmctl(zs, dmtozs(mlines), DMBIC);
static int dmtozs(int bits);