Insertion between the nodes. Circular doubly linked lis

/* Insertion between the nodes. Circular doubly linked list */
#include <stdio.h>
#include <stdlib.h>

struct node {
    struct node *prev;
    int data;
    struct node *next;
};

struct node* addToEmpty(int data)
{
    struct node* temp = malloc(sizeof(struct node));
    temp->prev = temp;
    temp->data = data;
    temp->next = temp;
    return temp;
}

struct node* addAtBeg(struct node* tail, int data)
{
    struct node *temp = tail->next;
    struct node *newP = malloc(sizeof(struct node));
    newP->prev = NULL;
    newP->data = data;
    newP->next = NULL;

    newP->prev = tail;
    newP->next = temp;
    temp->prev = newP;
    tail->next = newP;
    return tail;

}

struct node* addAtEnd(struct node* tail, int data)
{
    struct node *newP = addToEmpty(data);
    if (tail == NULL)
        return newP;
    else
    {
        struct node *temp = tail->next;
        newP->next = temp;
        newP->prev = tail;
        tail->next = newP;
        temp->prev = newP;
        tail = newP;
        return tail;
    }
}

struct node *addAfterPos(struct node* tail, int data, int pos)
{
    struct node *newP = addToEmpty(data);
    if (tail == NULL)
        return newP;
    struct node *temp = tail->next;
    while (pos > 1)
    {
        temp = temp->next;
        pos--;
    }
    newP->prev = temp;
    newP->next = temp->next;
    temp->next->prev = newP;
    temp->next = newP;
    if (temp == tail)
        tail = tail->next;
    return tail;
}

void print(struct node* tail)
{
    if (tail == NULL)
        printf("No element in the list\n");
    else
    {
        struct node *temp = tail->next;
        do {
            printf("%d ", temp->data);
            temp = temp->next;
        } while (temp != tail->next);
    }
    printf("\n");
}

int main()
{
    struct node *tail = NULL;
    tail = addToEmpty(45);
    /* tail = addAtBeg(tail, 34); */
    tail = addAtEnd(tail, 56);
    tail = addAtEnd(tail, 60);
    tail = addAfterPos(tail, 90, 2);
    print(tail);
    return 0;
}

//Output: 45 56 90 60