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Subject[PATCH 3/4] vt: ignore csi sequences with intermediate characters.
Date
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 <textshell@uchuujin.de>
---
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)
+ return;
+ vc->vc_state = ESnormal;
+ return;
case ESpercent:
vc->vc_state = ESnormal;
switch (c) {
--
2.11.0
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