TYPE_OFFSET
fshead->nextfu->fmt[TYPE_OFFSET] = 'x';
fshead->nextfs->nextfu->fmt[TYPE_OFFSET] = 'x';
fshead->nextfu->fmt[TYPE_OFFSET] = 'd';
fshead->nextfs->nextfu->fmt[TYPE_OFFSET] = 'd';
fshead->nextfu->fmt[TYPE_OFFSET] = *optarg;
fshead->nextfs->nextfu->fmt[TYPE_OFFSET] =