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Curl_llist_insert_next: allow insertion first in the list

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When we specify the "insert after" entry as NULL, this function now
inserts the new entry first in the list.
This commit is contained in:
Daniel Stenberg 2010-08-10 10:52:26 +02:00
parent 4d53dc5d80
commit 03da3ba1c0
1 changed files with 16 additions and 4 deletions
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18
lib/llist.c
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@ -55,7 +55,13 @@ Curl_llist_alloc(curl_llist_dtor dtor)
}
/*
* Curl_llist_insert_next() returns 1 on success and 0 on failure.
* Curl_llist_insert_next()
*
* Inserts a new list element after the given one 'e'. If the given existing
* entry is NULL and the list already has elements, the new one will be
* inserted first in the list.
*
* Returns: 1 on success and 0 on failure.
*/
int
Curl_llist_insert_next(struct curl_llist *list, struct curl_llist_element *e,
@ -73,14 +79,20 @@ Curl_llist_insert_next(struct curl_llist *list, struct curl_llist_element *e,
list->tail = ne;
}
else {
ne->next = e->next;
/* if 'e' is NULL here, we insert the new element first in the list */
ne->next = e?e->next:list->head;
ne->prev = e;
if(e->next) {
if(!e) {
list->head->prev = ne;
list->head = ne;
}
else if(e->next) {
e->next->prev = ne;
}
else {
list->tail = ne;
}
if(e)
e->next = ne;
}