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struct list_node {
struct list_node *next;
void *data;
};
struct list {
struct list_node *first, *last;
};
/* allocates and initialises list structure; returns NULL if malloc fails */
struct list *list_create();
/* frees all memory associated with the list */
void list_destroy(struct list *list);
/* appends entry to list; returns 1 if ok, 0 if malloc fails */
int list_push(struct list *list, void *data);
/* removes first entry from list and returns data */
void *list_shift(struct list *list);
/* returns first node */
struct list_node *list_first(struct list *list);
/* returns the next node after the argument */
struct list_node *list_next(struct list_node *node);
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