static bool vc_is_control(struct vc_data *vc, int tc, int c)
{
	/*
	 * A bitmap for codes <32. A bit of 1 indicates that the code
	 * corresponding to that bit number invokes some special action (such
	 * as cursor movement) and should not be displayed as a glyph unless
	 * the disp_ctrl mode is explicitly enabled.
	 */
	static const u32 CTRL_ACTION = 0x0d00ff81;
	/* Cannot be overridden by disp_ctrl */
	static const u32 CTRL_ALWAYS = 0x0800f501;

	if (vc->vc_state != ESnormal)
		return true;

	if (!tc)
		return true;

	/*
	 * If the original code was a control character we only allow a glyph
	 * to be displayed if the code is not normally used (such as for cursor
	 * movement) or if the disp_ctrl mode has been explicitly enabled.
	 * Certain characters (as given by the CTRL_ALWAYS bitmap) are always
	 * displayed as control characters, as the console would be pretty
	 * useless without them; to display an arbitrary font position use the
	 * direct-to-font zone in UTF-8 mode.
	 */
	if (c < 32) {
		if (vc->vc_disp_ctrl)
			return CTRL_ALWAYS & BIT(c);
		else
			return vc->vc_utf || (CTRL_ACTION & BIT(c));
	}

	if (c == 127 && !vc->vc_disp_ctrl)
		return true;

	if (c == 128 + 27)
		return true;

	return false;
}
static bool vc_is_control(struct vc_data *vc, int tc, int c)
{
	 
	static const u32 CTRL_ACTION = 0x0d00ff81;
	 
	static const u32 CTRL_ALWAYS = 0x0800f501;

	if (vc->vc_state != ESnormal)
		return true;

	if (!tc)
		return true;

	 
	if (c < 32) {
		if (vc->vc_disp_ctrl)
			return CTRL_ALWAYS & BIT(c);
		else
			return vc->vc_utf || (CTRL_ACTION & BIT(c));
	}

	if (c == 127 && !vc->vc_disp_ctrl)
		return true;

	if (c == 128 + 27)
		return true;

	return false;
}