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s390/tty3270: add support for VT100 graphics escape

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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: Sven Schnelle <svens@linux.ibm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Tested-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Sven Schnelle
2022-11-17 17:30:40 +01:00
committed by Heiko Carstens
parent 94dbb0a76c
commit e4b57b9393
1 changed files with 23 additions and 4 deletions
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27
drivers/s390/char/con3270.c
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@@ -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) {