VCPIO_PAD
if (rd_skip(VCPIO_PAD(sizeof(HD_VCPIO) + nsz)) < 0)
arcn->pad = VCPIO_PAD(arcn->sb.st_size);
(rd_skip(VCPIO_PAD(arcn->sb.st_size)) < 0))
(VCPIO_PAD(sizeof(HD_VCPIO) + sizeof(TRAILER)));
arcn->pad = VCPIO_PAD(arcn->sb.st_size);
(wr_skip(VCPIO_PAD(sizeof(HD_VCPIO) + nsz)) < 0)) {
(wr_skip(VCPIO_PAD(arcn->ln_nlen)) < 0)) {