Function generate_merge_patch

cJSON_Utils.c:1391–1471

}

static cJSON *generate_merge_patch(cJSON * const from, cJSON * const to, const cJSON_bool case_sensitive)
{
    cJSON *from_child = NULL;
    cJSON *to_child = NULL;
    cJSON *patch = NULL;
    if (to == NULL)
    {
        /* patch to delete everything */
        return cJSON_CreateNull();
    }
    if (!cJSON_IsObject(to) || !cJSON_IsObject(from))
    {
        return cJSON_Duplicate(to, 1);
    }

    sort_object(from, case_sensitive);
    sort_object(to, case_sensitive);

    from_child = from->child;
    to_child = to->child;
    patch = cJSON_CreateObject();
    if (patch == NULL)
    {
        return NULL;
    }
    while (from_child || to_child)
    {
        int diff;
        if (from_child != NULL)
        {
            if (to_child != NULL)
            {
                diff = strcmp(from_child->string, to_child->string);
            }
            else
            {
                diff = -1;
            }
        }
        else
        {
            diff = 1;
        }

        if (diff < 0)
        {
            /* from has a value that to doesn't have -> remove */
            cJSON_AddItemToObject(patch, from_child->string, cJSON_CreateNull());

            from_child = from_child->next;
        }
        else if (diff > 0)
        {
            /* to has a value that from doesn't have -> add to patch */
            cJSON_AddItemToObject(patch, to_child->string, cJSON_Duplicate(to_child, 1));

            to_child = to_child->next;
        }