ISO_STANDARD_ID
if ((strncmp(pdsc->id, ISO_STANDARD_ID, 4)) == 0)
if (strncmp(pdsc->id, ISO_STANDARD_ID, 4) != 0 ||
if (bcmp(vd->id, ISO_STANDARD_ID, sizeof vd->id) != 0)
if (bcmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) != 0) {