double spisok

// doublespisok.cpp: определяет точку входа для консольного приложения.
//

#include "stdafx.h"
#include <iostream>

struct list
{
    int v;
    list *next;
    list *prev;
};


struct list * init(int a)
{
    list *lst = (struct list*)malloc(sizeof(struct list));
    lst->v = a;
    lst->next = NULL;
    lst->prev = NULL;
    return(lst);
}


list *addelem(list *lst, int v)
{
    list *curr, *buff;
    curr = (list*)malloc(sizeof(list));
    buff = lst->next;
    lst->next = curr;
    curr->v = v;
    curr->prev = lst;
    curr->next = buff;
    if (buff != NULL)
        buff->prev = curr;
    return(curr);
}

struct list *deleteelem(list *lst)
{
    struct list *prev, *next;
    prev = lst->prev;
    next = lst->next;
    if (prev != NULL)
        prev->next = lst->next;
    if (next != NULL)
        next->prev = lst->prev;
    free(lst);
    return(prev);
}
void listprint(list *lst)
{
    struct list *curr;
    curr = lst;
    do {
        printf("%d ", curr->v);
        curr = curr->next;
    } while (curr != NULL);
    printf("\n");
}


void olistprint(list *lst)
{
    struct list *curr;
    curr = lst;
    while (curr->next != NULL)
        curr = curr->next;
    do
    {
        printf("%d ", curr->v);
        curr = curr->prev;
    } while (curr != NULL);
    printf("\n");
}

int main()
{
    list *p = NULL, *curr=NULL;
    p = init(0);
    curr = p;
    for (int i = 1; i <10; i++) {
        curr = addelem(curr, i);
    }
    listprint(p);
    olistprint(p);
    deleteelem(curr);
    listprint(p);
    return 0;
}