[PATCH 3/4] vt: ignore csi sequences with intermediate characters.
From: Martin Hostettler <hidden>
Date: 2018-12-15 14:40:54
Also in:
lkml
Subsystem:
the rest, tty layer and serial drivers · Maintainers:
Linus Torvalds, Greg Kroah-Hartman, Jiri Slaby
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) + return; + vc->vc_state = ESnormal; + return; case ESpercent: vc->vc_state = ESnormal; switch (c) {
--
2.11.0