C - Iteratively add nodes of an EXISTING linked list

• All new numbers will be assigned to the end of the linked list.

node *head is the EXISTING linked list
int len means how many nodes you want to add

void add_nodes_iteratively(node *head, int len)
{
    // Variables used throughout the function
    int num;
    int counter = 1;
    node *current = head;

    // Counts how many nodes there are
    while (current->next != NULL) {
        current = current->next;
        counter++;
    }

    for (int i = 0 + counter; i < len + counter; i++)
    {
        printf("Input data for node %i: ", i);
        scanf("%i", &num);

        // Iterate to last node
        while (current->next != NULL) {
            current = current->next;
        }

        /* now we can add values to end*/
        current->next = (node *) malloc(sizeof(node));
        if (current->next == NULL) { return; }
        current->next->val = num;
        current->next->next = NULL;
    }
}
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C - Iteratively add nodes of a NEW linked list