Value: do { \ (elm)->field.scqe_prev = SH_PTR_TO_OFF(elm, head); \ (elm)->field.scqe_next = (head)->scqh_first + \ (elm)->field.scqe_prev; \ if ((head)->scqh_last == 0) \ (head)->scqh_last = -(elm)->field.scqe_prev; \ else \ SH_CIRCLEQ_FIRSTP(head, type)->field.scqe_prev = \ SH_PTR_TO_OFF(SH_CIRCLEQ_FIRSTP(head, type), elm); \ (head)->scqh_first = -(elm)->field.scqe_prev; \ } while (0)
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