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lib: add listnode_add_head()
Provide a new convenience function that adds an element to the beginning of a list. Signed-off-by: Renato Westphal <renato@opensourcerouting.org>
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@ -70,6 +70,26 @@ void listnode_add(struct list *list, void *val)
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list->count++;
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}
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void listnode_add_head(struct list *list, void *val)
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{
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struct listnode *node;
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assert(val != NULL);
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node = listnode_new();
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node->next = list->head;
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node->data = val;
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if (list->head == NULL)
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list->head = node;
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else
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list->head->prev = node;
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list->head = node;
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list->count++;
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}
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void listnode_add_sort(struct list *list, void *val)
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{
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struct listnode *n;
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@ -82,6 +82,19 @@ extern struct list *list_new(void);
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*/
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extern void listnode_add(struct list *list, void *data);
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/*
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* Add a new element to the beginning of a list.
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*
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* Runtime is O(1).
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*
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* list
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* list to operate on
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*
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* data
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* element to add
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*/
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extern void listnode_add_head(struct list *list, void *data);
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/*
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* Insert a new element into a list with insertion sort.
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*
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