LIST_ITEM_HANDLE singlylinkedlist_add_head()

in src/singlylinkedlist.c [375:415]

• 33 lines of code
• 4 McCabe index (conditional complexity)

LIST_ITEM_HANDLE singlylinkedlist_add_head(SINGLYLINKEDLIST_HANDLE list, const void* item)
{
    LIST_ITEM_HANDLE result;

    /* Codes_SRS_LIST_02_001: [ If list is NULL then singlylinkedlist_add_head shall fail and return NULL. ]*/
    if (list == NULL)
    {
        LogError("Invalid argument SINGLYLINKEDLIST_HANDLE list=%p", list);
        result = NULL;
    }
    else
    {
        result = malloc(sizeof(LIST_ITEM_INSTANCE));

        if (result == NULL)
        {
            /*Codes_SRS_LIST_02_003: [ If there are any failures then singlylinkedlist_add_head shall fail and return NULL. ]*/
            LogError("failure in malloc");
            /*return as is*/
        }
        else
        {
            /*Codes_SRS_LIST_02_002: [ singlylinkedlist_add_head shall insert item at head, succeed and return a non-NULL value. ]*/
            result->item = item;
            if (list->head == NULL)
            {
                result->next = NULL;
                list->head = result;
                list->tail = result;
                
            }
            else
            {
                result->next = list->head;
                list->head = result;
            }
        }
    }

    return result;
}