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-rw-r--r--linked_list.h18
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diff --git a/linked_list.h b/linked_list.h
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+#ifndef LINKED_LIST_H
+#define LINKED_LIST_H
+
+typedef struct linked_list linked_list;
+
+struct linked_list {
+ linked_list *next; /* Next node in the list. */
+ linked_list *prev; /* Previous node in the list. */
+ void *data; /* Pointer to data. */
+};
+
+extern linked_list *add_node(linked_list **tail, void *data);
+extern void remove_node(linked_list *node);
+extern linked_list *get_head(linked_list *node);
+extern linked_list *get_tail(linked_list *node);
+extern int linked_list_size(linked_list *tail);
+
+#endif