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lib: linklist: add listnode_add_before()

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This utility function, to join the zoo that the Quagga linked-list
implementation has accumulated, does an insert-before while returning
the newly allocated node.

It is similar to:
- listnode_add_after(), but
  - complementary direction
  - returns allocated node
- list_add_node_prev(), but
  - supports before == NULL
  - returns allocated node

In general, the entire linked-list implementation is in bad shape, and
while it needs a cleanup / rewrite / replacement, this would both cause
significant conflicts and block other cleanups...

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
This commit is contained in:
David Lamparter 2016-07-28 17:23:41 +02:00 committed by Donald Sharp
parent 16f5949d44
commit b21e9619c5
2 changed files with 39 additions and 0 deletions
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38
lib/linklist.c
View File

@ -159,6 +159,44 @@ listnode_add_after (struct list *list, struct listnode *pp, void *val)
list->count++;
}
struct listnode *
listnode_add_before (struct list *list, struct listnode *pp, void *val)
{
struct listnode *nn;
assert (val != NULL);
nn = listnode_new ();
nn->data = val;
if (pp == NULL)
{
if (list->tail)
list->tail->next = nn;
else
list->head = nn;
nn->prev = list->tail;
nn->next = pp;
list->tail = nn;
}
else
{
if (pp->prev)
pp->prev->next = nn;
else
list->head = nn;
nn->prev = pp->prev;
nn->next = pp;
pp->prev = nn;
}
list->count++;
return nn;
}
/* Move given listnode to tail of the list */
void
listnode_move_to_tail (struct list *l, struct listnode *n)

1
lib/linklist.h
View File

@ -68,6 +68,7 @@ extern void list_free (struct list *);
extern void listnode_add (struct list *, void *);
extern void listnode_add_sort (struct list *, void *);
extern void listnode_add_after (struct list *, struct listnode *, void *);
extern struct listnode *listnode_add_before (struct list *, struct listnode *, void *);
extern void listnode_move_to_tail (struct list *, struct listnode *);
extern void listnode_delete (struct list *, void *);
extern struct listnode *listnode_lookup (struct list *, void *);