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patch 9.1.0321: Garbled output on serial terminals with XON/XOFF flow control

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Problem:  When used terminal with XON/XOFF flow control, vim tries to
          still make CTRL-S mapping available, which results in severe
          screen corruption, especially on large redraws, and even
          spurious inputs (John Tsiombikas)
Solution: Disallow CTRL-S mapping if such terminal is recognized.
          Don't remove IXON from the bitmask inversion.
          (Anton Sharonov)

*** When started like this:

    TERM=vt420 vim

:set termcap

    shows "t_xon=y"

map <C-S> :echo "abc"<CR>

    does nothing (after <C-S> output freezes and subsequent <C-Q>
    unfreezes it)

*** When started like this:

    TERM=xterm vim

:set termcap

    shows "t_xon="

map <C-S> :echo "abc"<CR>

    works (after <C-S> one see "abc" string echo-ed)

fixes: #12674
closes: #14542

Signed-off-by: Anton Sharonov <anton.sharonov@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
This commit is contained in:
Anton Sharonov
2024-04-14 20:02:24 +02:00
committed by Christian Brabandt
parent 4052474a1b
commit 49528da8a6
10 changed files with 60 additions and 6 deletions
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3
src/os_unix.c
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@@ -3766,7 +3766,8 @@ mch_settmode(tmode_T tmode)
{
// ~ICRNL enables typing ^V^M
// ~IXON disables CTRL-S stopping output, so that it can be mapped.
tnew.c_iflag &= ~(ICRNL | IXON);
tnew.c_iflag &= ~(ICRNL |
(T_XON == NULL || *T_XON == NUL ? IXON : 0));
tnew.c_lflag &= ~(ICANON | ECHO | ISIG | ECHOE
# if defined(IEXTEN)
| IEXTEN // IEXTEN enables typing ^V on SOLARIS