Commit e4b57b93 authored by Sven Schnelle's avatar Sven Schnelle Committed by Heiko Carstens
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s390/tty3270: add support for VT100 graphics escape 



Add support for ESC(B and ESC(0 to switch between character charset
and graphics charset. Used in vt100 and later terminal generations.

Signed-off-by: default avatarSven Schnelle <svens@linux.ibm.com>
Acked-by: default avatarHeiko Carstens <hca@linux.ibm.com>
Tested-by: default avatarNiklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
parent 94dbb0a7

drivers/s390/char/con3270.c

+23 −4
Original line number Diff line number Diff line
@@ -1557,7 +1557,7 @@ static void tty3270_goto_xy(struct tty3270 *tp, int cx, int cy) 
 */

static void tty3270_escape_sequence(struct tty3270 *tp, char ch)

{

	enum { ESnormal, ESesc, ESsquare, ESgetpars };

	enum { ESnormal, ESesc, ESsquare, ESparen, ESgetpars };



	if (tp->esc_state == ESnormal) {

		if (ch == 0x1b)
@@ -1571,6 +1571,9 @@ static void tty3270_escape_sequence(struct tty3270 *tp, char ch) 
		case '[':

			tp->esc_state = ESsquare;

			break;

		case '(':

			tp->esc_state = ESparen;

			break;

		case 'E':

			tty3270_cr(tp);

			tty3270_lf(tp);
@@ -1604,15 +1607,28 @@ static void tty3270_escape_sequence(struct tty3270 *tp, char ch) 
		}

		return;

	}

	if (tp->esc_state == ESsquare) {



	switch (tp->esc_state) {

	case ESparen:

		tp->esc_state = ESnormal;

		switch (ch) {

		case 'B':

			tp->attributes.alternate_charset = 0;

			break;

		case '0':

			tp->attributes.alternate_charset = 1;

			break;

		}

		return;

	case ESsquare:

		tp->esc_state = ESgetpars;

		memset(tp->esc_par, 0, sizeof(tp->esc_par));

		tp->esc_npar = 0;

		tp->esc_ques = (ch == '?');

		if (tp->esc_ques)

			return;

	}

	if (tp->esc_state == ESgetpars) {

		fallthrough;

	case ESgetpars:

		if (ch == ';' && tp->esc_npar < ESCAPE_NPAR - 1) {

			tp->esc_npar++;

			return;
@@ -1622,6 +1638,9 @@ static void tty3270_escape_sequence(struct tty3270 *tp, char ch) 
			tp->esc_par[tp->esc_npar] += ch - '0';

			return;

		}

		break;

	default:

		break;

	}

	tp->esc_state = ESnormal;

	if (ch == 'n' && !tp->esc_ques) {