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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
typedef struct dll_t dll_t;
typedef struct dll_t {
void *data;
dll_t *next;
dll_t *prev;
} dll_t;
dll_t *dllalloc(){
dll_t *output = malloc(sizeof(dll_t));
if (output == NULL)
return NULL;
output->next = NULL;
output->prev = NULL;
return output;
}
void dllsetdata(dll_t *node, void *data){
node->data = malloc(sizeof(data));
memcpy(node->data, data, sizeof(data));
}
void dllsetnext(dll_t *node, dll_t *next){
if (node->next == NULL) {
node->next = next;
node->next->prev = node;
}
else
dllsetnext(node->next, next);
}
void dllsetprev(dll_t *node, dll_t *prev){
if (node->prev == NULL) {
node->prev = prev;
node->prev->next = node;
}
else
dllsetprev(node->prev, prev);
}
void *dllgetat(dll_t *head, int index){
if (index == 0)
return head->data;
else {
if (head->next != NULL) {
return dllgetat(head->next, index - 1);
}else {
return NULL;
}
}
}
void dllfreeall(dll_t *head){
if (head->next != NULL)
dllfreeall(head->next);
free(head->data);
free(head);
}
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