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optimization src/adlist.c:listJoin()

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sundb 2020-11-09 20:16:09 +08:00 committed by Madelyn Olson
parent 19c29b6007
commit c09b5941ce
1 changed files with 4 additions and 3 deletions
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7
src/adlist.c
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@ -360,15 +360,16 @@ void listRotateHeadToTail(list *list) {
/* Add all the elements of the list 'o' at the end of the /* Add all the elements of the list 'o' at the end of the
* list 'l'. The list 'other' remains empty but otherwise valid. */ * list 'l'. The list 'other' remains empty but otherwise valid. */
void listJoin(list *l, list *o) { void listJoin(list *l, list *o) {
if (o->head) if (o->len == 0) return;
o->head->prev = l->tail;
o->head->prev = l->tail;
if (l->tail) if (l->tail)
l->tail->next = o->head; l->tail->next = o->head;
else else
l->head = o->head; l->head = o->head;
if (o->tail) l->tail = o->tail; l->tail = o->tail;
l->len += o->len; l->len += o->len;
/* Setup other as an empty list. */ /* Setup other as an empty list. */