Function cJSON_SetValuestring

external/cJSON/cJSON.c:435–476

Note: when passing a NULL valuestring, cJSON_SetValuestring treats this as an error and return NULL */

/* Note: when passing a NULL valuestring, cJSON_SetValuestring treats this as an error and return NULL */
CJSON_PUBLIC(char*) cJSON_SetValuestring(cJSON *object, const char *valuestring)
{
    char *copy = NULL;
    size_t v1_len;
    size_t v2_len;
    /* if object's type is not cJSON_String or is cJSON_IsReference, it should not set valuestring */
    if ((object == NULL) || !(object->type & cJSON_String) || (object->type & cJSON_IsReference))
    {
        return NULL;
    }
    /* return NULL if the object is corrupted or valuestring is NULL */
    if (object->valuestring == NULL || valuestring == NULL)
    {
        return NULL;
    }

    v1_len = strlen(valuestring);
    v2_len = strlen(object->valuestring);

    if (v1_len <= v2_len)
    {
        /* strcpy does not handle overlapping string: [X1, X2] [Y1, Y2] => X2 < Y1 or Y2 < X1 */
        if (!( valuestring + v1_len < object->valuestring || object->valuestring + v2_len < valuestring ))
        {
            return NULL;
        }
        strcpy(object->valuestring, valuestring);
        return object->valuestring;
    }
    copy = (char*) cJSON_strdup((const unsigned char*)valuestring, &global_hooks);
    if (copy == NULL)
    {
        return NULL;
    }
    if (object->valuestring != NULL)
    {
        cJSON_free(object->valuestring);
    }
    object->valuestring = copy;

    return copy;
}

typedef struct
{