Write a “C” function to convert an array to a doubly-linked list.

array_to_double-linked_list.c

#include <stdio.h>
#include <stdlib.h>

struct DoubleLinkedListItem	//item of linked list
{
    int field;
    struct DoubleLinkedListItem *p_prev;
    struct DoubleLinkedListItem *p_next;
};

struct DoubleLinkedListItem * converArrayToDoubleLinkedList(const arr[], size_t arr_size)
{
    struct DoubleLinkedListItem *p_head = NULL;
    do
    {
        struct DoubleLinkedListItem *p_current = NULL;
        size_t i = 0;
        if (arr_size <= 0) //simple check
        {
            printf("Warning: size of array equal or less 0!");
            break;
        }
        for(; i < arr_size; i++)
        {
            struct DoubleLinkedListItem *p_item =
                    (struct DoubleLinkedListItem*)malloc(sizeof (struct DoubleLinkedListItem));
            if (NULL == p_item) // simple check
            {
                printf("Some error occur during allocating, exit");
                break;
            }

            p_item->field = arr[i];
            if (NULL == p_current)
            {
                p_current = p_item;
                p_current->p_prev = NULL;
                p_current->p_next = NULL;
                p_head = p_current;
            } else
            {
                p_current->p_next = p_item;
                p_item->p_prev = p_current;
                p_item->p_next = NULL;

                p_current = p_item;
            }
        }
    } while(0); //usually I use 'false' in C++, but there is no bool type in C89

    return p_head;
}

int main(int argc, char **argv)
{
    int test_arr[] = {23, 32, 43, 54, 2, 86, 90};
    int i = 0;
    struct DoubleLinkedListItem *p_head = NULL;
    printf("Before processing:\n");
    for (; i < sizeof(test_arr)/sizeof(test_arr[0]); i++)
    {
        printf("%d ", test_arr[i]);
    }
    printf("\n");

    p_head = converArrayToDoubleLinkedList(test_arr, sizeof(test_arr)/sizeof(test_arr[0]));

    printf("After processing:\n");
    if (NULL != p_head)
    {
        do
        {
            struct DoubleLinkedListItem *p_for_free = p_head;
            printf("%d ", p_head->field);
            p_head_2 = p_head->p_next;
            free(p_for_free);
        } while(p_head);
        p_head = NULL;

    } else
    {
        printf("empty linked list\n");
    }
    printf("\n");
    return 0;
}