ObjFW  Diff

		if ((*string = malloc(bufferLength)) == NULL)
			return -1;

		length = vsnprintf(*string, bufferLength - 1, format,
		    arguments);

		if (length > 0 && (size_t)length < bufferLength - 1)
		if (length >= 0 && (size_t)length < bufferLength - 1)
			break;

		if (bufferLength > INT_MAX / 2) {
			free(*string);
			return -1;
		}