GNUmifluz: LIST_INSERT_AFTER

do { \
 if (((elm)->field.le_next = (listelm)->field.le_next) != NULL) \
 (listelm)->field.le_next->field.le_prev = \
 &(elm)->field.le_next; \
 (listelm)->field.le_next = (elm); \
 (elm)->field.le_prev = &(listelm)->field.le_next; \
} while (0)