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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 <textshell@uchuujin.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Martin Hostettler 2018-12-15 15:34:22 +01:00 committed by Greg Kroah-Hartman
parent 5445447b62
commit 7a99565f87
1 changed files with 10 additions and 1 deletions
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11
drivers/tty/vt/vt.c
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@ -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()) */
@ -2261,6 +2261,10 @@ 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':
@ -2423,6 +2427,11 @@ 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) {