Re: [PATCH 3/4] vt: ignore csi sequences with intermediate characters.

Various csi sequences contain intermediate characters between the
parameters and the final character. Introduce a additional state that
cleanly ignores these sequences.

This allows the vt to ignore these sequences used by more capable
terminal implementations such as "request mode", etc.

Signed-off-by: Martin Hostettler <redacted>
---
  drivers/tty/vt/vt.c | 11 ++++++++++-
  1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index 448b4f6be7d1..24cd0e9c037b 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c

@@ -2023,7 +2023,7 @@ static void restore_cur(struct vc_data *vc)
  }
  
  enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
-	EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
+	EShash, ESsetG0, ESsetG1, ESpercent, EScsiignore, ESnonstd,
  	ESpalette, ESosc };
  
  /* console_lock is held (except via vc_init()) */

@@ -2259,6 +2259,10 @@ static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
  			vc->vc_par[vc->vc_npar] += c - '0';
  			return;
  		}
+		if (c >= 0x20 && c <= 0x2f) {
+			vc->vc_state = EScsiignore;
+			return;
+		}
  		vc->vc_state = ESnormal;
  		switch(c) {
  		case 'h':

@@ -2421,6 +2425,11 @@ static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
  			return;
  		}
  		return;
+	case EScsiignore:
+		if (c >= 20 && c <= 0x3f)