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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
Download Patch File Download Diff File Expand all files Collapse all files

2
runtime/doc/tags
View File

@@ -1157,6 +1157,7 @@ $quote eval.txt /*$quote*
't_vi' term.txt /*'t_vi'*
't_vs' term.txt /*'t_vs'*
't_xn' term.txt /*'t_xn'*
't_xo' term.txt /*'t_xo'*
't_xs' term.txt /*'t_xs'*
'ta' options.txt /*'ta'*
'tabline' options.txt /*'tabline'*
@@ -10403,6 +10404,7 @@ t_ve term.txt /*t_ve*
t_vi term.txt /*t_vi*
t_vs term.txt /*t_vs*
t_xn term.txt /*t_xn*
t_xo term.txt /*t_xo*
t_xs term.txt /*t_xs*
tab intro.txt /*tab*
tab-page tabpage.txt /*tab-page*

9
runtime/doc/term.txt
View File

@@ -1,4 +1,4 @@
*term.txt* For Vim version 9.1. Last change: 2024 Feb 28
*term.txt* For Vim version 9.1. Last change: 2024 Apr 14
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -382,7 +382,7 @@ The options are listed below. The associated termcap code is always equal to
the last two characters of the option name. Only one termcap code is
required: Cursor motion, 't_cm'.
The options 't_da', 't_db', 't_ms', 't_xs', 't_xn' represent flags in the
The options 't_da', 't_db', 't_ms', 't_xs', 't_xn', 't_xo' represent flags in the
termcap. When the termcap flag is present, the option will be set to "y".
But any non-empty string means that the flag is set. An empty string means
that the flag is not set. 't_CS' works like this too, but it isn't a termcap
@@ -441,6 +441,11 @@ OUTPUT CODES *terminal-output-codes*
*t_xn* *'t_xn'*
t_xn if non-empty, writing a character at the last screen cell
does not cause scrolling
*t_xo* *'t_xo'*
t_xo if non-empty, terminal uses xon/xoff handshaking, mapping
CTRL-S will not be possible then, since it is used for flow
control (used by vt420 terminal). Setting this flag has only
an effect when starting Vim.
t_ZH italics mode *t_ZH* *'t_ZH'*
t_ZR italics end *t_ZR* *'t_ZR'*

3
runtime/doc/version9.txt
View File

@@ -1,4 +1,4 @@
*version9.txt* For Vim version 9.1. Last change: 2024 Apr 08
*version9.txt* For Vim version 9.1. Last change: 2024 Apr 14
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -41591,6 +41591,7 @@ Commands: ~
Options: ~
'winfixbuf' Keep buffer focused in a window
't_xo' Terminal uses XON/XOFF handshaking (e.g. vt420).
==============================================================================
INCOMPATIBLE CHANGES *incompatible-9.2*