GNUmifluz: SH_CIRCLEQ_INSERT_AFTER

do { \
 (elm)->field.scqe_prev = SH_PTR_TO_OFF(elm, listelm); \
 (elm)->field.scqe_next = (listelm)->field.scqe_next + \
 (elm)->field.scqe_prev; \
 if (SH_CIRCLEQ_NEXTP(listelm, field, type) == (void *)head) \
 (head)->scqh_last = SH_PTR_TO_OFF(head, elm); \
 else \
 SH_CIRCLEQ_NEXTP(listelm, \
 field, type)->field.scqe_prev = \
 SH_PTR_TO_OFF(SH_CIRCLEQ_NEXTP(listelm, \
 field, type), elm); \
 (listelm)->field.scqe_next = -(elm)->field.scqe_prev; \
} while (0)