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adlist: fix listJoin() to handle empty lists.

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This commit is contained in:
antirez 2017-05-03 14:15:25 +02:00
parent 6798736909
commit 79226cb9fa
1 changed files with 8 additions and 2 deletions
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8
src/adlist.c
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@ -345,8 +345,14 @@ void listRotate(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) {
l->tail->next = o->head; if (o->head)
o->head->prev = l->tail; o->head->prev = l->tail;
if (l->tail)
l->tail->next = o->head;
else
l->head = o->head;
l->tail = o->tail; l->tail = o->tail;
/* Setup other as an empty list. */ /* Setup other as an empty list. */