Function listRotateTailToHead

app/redis-6.2.6/src/adlist.c:331–343

Rotate the list removing the tail node and inserting it to the head. */

/* Rotate the list removing the tail node and inserting it to the head. */
void listRotateTailToHead(list *list) {
    if (listLength(list) <= 1) return;

    /* Detach current tail */
    listNode *tail = list->tail;
    list->tail = tail->prev;
    list->tail->next = NULL;
    /* Move it as head */
    list->head->prev = tail;
    tail->prev = NULL;
    tail->next = list->head;
    list->head = tail;
}

/* Rotate the list removing the head node and inserting it to the tail. */
void listRotateHeadToTail(list *list) {