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#include <stdlib.h>
#include "linked_list.h"
linked_list *add_node(linked_list **tail, void *data) {
if (tail == NULL) {
return NULL;
} else {
linked_list *node = calloc(1, sizeof(linked_list));
if (node == NULL) {
return NULL;
} else {
node->next = NULL;
node->data = data;
if (*tail == NULL) {
node->prev = NULL;
*tail = node;
} else {
(*tail)->next = node;
node->prev = *tail;
}
return node;
}
}
}
void remove_node(linked_list *node) {
if (node != NULL) {
if (node->prev != NULL) {
node->prev->next = node->next;
}
if (node->next != NULL) {
node->next->prev = node->prev;
}
free(node);
}
}
linked_list *get_head(linked_list *node) {
linked_list *head;
for (head = node; head != NULL && head->prev != NULL; head = head->prev);
return head;
}
linked_list *get_tail(linked_list *node) {
linked_list *tail;
for (tail = node; tail != NULL && tail->next != NULL; tail = tail->next);
return tail;
}
int linked_list_size(linked_list *tail) {
int i = 0;
for (linked_list *node = tail; node != NULL; node = node->prev, ++i);
return i;
}
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