verifytag
err = verifytag(&aep->aed_tag, loc, &aep->aed_tag, UD_ALLOC_EXT_DESC);
err = verifytag(&fidp->fid_tag, block, &fidp->fid_tag, UD_FILE_ID_DESC);
extern int32_t verifytag(struct tag *, uint32_t, struct tag *, int);
err = verifytag(tp, FIRSTAVDP, tp, UD_ANCH_VOL_DESC);
err = verifytag(tp, nextblock, tp, 0);
err = verifytag(&lvintp->lvid_tag, lvintblock, &lvintp->lvid_tag,
err = verifytag(&spacep->sbd_tag, pheadp->phdr_usb.sad_ext_loc,
err = verifytag(&fileset->fsd_tag, filesetblock, &fileset->fsd_tag,
extern int32_t verifytag(struct tag *, uint32_t, struct tag *, int);
err = verifytag(&fp->fe_tag, block, &fp->fe_tag, UD_FILE_ENTRY);
extern int32_t verifytag(struct tag *, uint32_t, struct tag *, int);
err = verifytag(tp, FIRSTAVDP, tp, UD_ANCH_VOL_DESC);
err = verifytag(tp, nextblock, tp, 0);
extern int verifytag(struct tag *, uint32_t, struct tag *, int);