MOUSE_PARAM_POS_OFF
x > MOUSE_PARAM_UTF8_MAX - MOUSE_PARAM_POS_OFF ||
y > MOUSE_PARAM_UTF8_MAX - MOUSE_PARAM_POS_OFF)
len += input_key_split2(x + MOUSE_PARAM_POS_OFF, &buf[len]);
len += input_key_split2(y + MOUSE_PARAM_POS_OFF, &buf[len]);
if (x + MOUSE_PARAM_POS_OFF > MOUSE_PARAM_MAX)
buf[len++] = x + MOUSE_PARAM_POS_OFF;
if (y + MOUSE_PARAM_POS_OFF > MOUSE_PARAM_MAX)
buf[len++] = y + MOUSE_PARAM_POS_OFF;
x < MOUSE_PARAM_POS_OFF ||
y < MOUSE_PARAM_POS_OFF)
x -= MOUSE_PARAM_POS_OFF;
y -= MOUSE_PARAM_POS_OFF;