From 5445447b62e0cf69a6f8b62df51c1ef6f2cd56fe Mon Sep 17 00:00:00 2001 From: Martin Hostettler Date: Sat, 15 Dec 2018 15:34:21 +0100 Subject: vt: Implement parsing for >, =, < private sequences. Private sequences can start with '>', '=' and (in theory) '<'. Implement correct parsing for these. The newly parsable sequences are cleanly ignored as it is customary with terminal emulators. This allows the vt to ignore various sequences used by more capable terminal implementations such as "Secondary Device Attributes", "Tertiary Device Attributes" and various advanced configuration commands that don't have dedicated terminfo entries. Signed-off-by: Martin Hostettler Signed-off-by: Greg Kroah-Hartman --- drivers/tty/vt/vt.c | 22 ++++++++++++++++++---- 1 file changed, 18 insertions(+), 4 deletions(-) (limited to 'drivers/tty') diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c index b59feeaaf02b..ec61f8356245 100644 --- a/drivers/tty/vt/vt.c +++ b/drivers/tty/vt/vt.c @@ -2236,9 +2236,21 @@ static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c) vc->vc_state=ESfunckey; return; } - vc->vc_priv = (c == '?') ? EPdec : EPecma; - if (vc->vc_priv != EPecma) + switch (c) { + case '?': + vc->vc_priv = EPdec; + return; + case '>': + vc->vc_priv = EPgt; + return; + case '=': + vc->vc_priv = EPeq; return; + case '<': + vc->vc_priv = EPlt; + return; + } + vc->vc_priv = EPecma; /* fall through */ case ESgetpars: if (c == ';' && vc->vc_npar < NPAR - 1) { @@ -2252,10 +2264,12 @@ static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c) vc->vc_state = ESnormal; switch(c) { case 'h': - set_mode(vc, 1); + if (vc->vc_priv <= EPdec) + set_mode(vc, 1); return; case 'l': - set_mode(vc, 0); + if (vc->vc_priv <= EPdec) + set_mode(vc, 0); return; case 'c': if (vc->vc_priv == EPdec) { -- cgit v1.2.3