list

C doubly linked list implementation.

API

Below is the public api currently provided by "list".

list_t *list_new();

Allocate and initialize a list.

list_t *mylist = list_new();

list_node_t *list_node_new(void *val)

Allocate and initialize a list_node_t with the given val.

list_node_t *node = list_node_new("my value");
node->val; // "my value"

list_node_t * list_rpush(list_t *self, list_node_t *node)

Append node to self, returning node.

list_rpush(list, list_node_new("value"));
list->tail->val; // "value"

list_node_t * list_rpop(list_t *self)

Return / detach node from the end of the list, or NULL.

list_node_t *last = list_rpop(names);

list_node_t *list_lpush(list_t *self, list_node_t *node)

Prepend node to self, returning node.

list_lpush(list, list_node_new("value"));
list->head->val; // "value"

list_node_t *list_find(list_t *self, void *val)

Return the list_node_t containing val or NULL.

list_node_t *node = list_find(list, "some value");

list_node_t *list_at(list_t *self, int index)

Return the list_node_t at the given index, where index may also be a negative integer indicating an index from the list tail.

list_at(list, 0);  // first
list_at(list, 1);  // second
list_at(list, -1); // last
list_at(list, -3); // third last

void list_remove(list_t *self, list_node_t *node)

Remove node from the list, freeing it and it's value.

list_remove(list, node);

void list_destroy(list_t *self)

Free the list and all nodes.

list_destroy(list);

list_iterator_t *list_iterator_new(list_t *list, list_direction_t direction)

Allocate and initialize a list_iterator_t with the given direction, where direction may be LIST_HEAD or LIST_TAIL.

list_node_t *node;
list_iterator_t *it = list_iterator_new(list, LIST_HEAD);
while ((node = list_iterator_next(it))) {
  puts(node->val);
}

list_node_t *list_iterator_next(list_iterator_t *self)

Return the next list_node_t or NULL.

void list_iterator_destroy(list_iterator_t *self);

Free the iterator only.

list_iterator_destroy(it);

Examples

list iteration:

list_t *langs = list_new();

list_node_t *c = list_rpush(langs, list_node_new("c"));
list_node_t *js = list_rpush(langs, list_node_new("js"));
list_node_t *ruby = list_rpush(langs, list_node_new("ruby"));

list_node_t *node;
list_iterator_t *it = list_iterator_new(langs, LIST_HEAD);
while ((node = list_iterator_next(it))) {
  puts(node->val);
}

list_iterator_destroy(it);
list_destroy(langs);

stdout:

c
js
ruby

Benchmarks

$ make benchmark

 10,000,000 nodes

              lpush: 0.5000s
              rpush: 0.5000s
               lpop: 0.0312s
               rpop: 0.0312s
   find (last node): 0.0312s
            iterate: 0.0625s
        at(100,000): 0.0000s
      at(1,000,000): 0.0000s
       at(-100,000): 0.0000s

Testing

$ make test

License

(The MIT License)

Copyright (c) 2009-2010 TJ Holowaychuk <tj@vision-media.ca>

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.