Re: 3.1.2: possible Cygwin DLL console or pty bug when forwarding the stdout to less within the Windows-Console (cmd.exe Win10 build 1809, 1903, 1909)

[Takashi Yano <takashi.yano@nifty.ne.jp>]

On Fri, 14 Feb 2020 12:04:16 +0100
cygwin@mg13.computerpost.de wrote:
> Since 3.1.1 (including current 3.1.3-snapshot) I have the problem
> that escape sequences (single character, not the three letters "ESC", 
> plus "[...m") suddenly appear inside less,
> and when I leave less, the cmd.exe console displays escape sequences at 
> the cursor up (down, left, right) and does not respond correctly to cls.
> It seems that less initializes the console and while less prints 
> something, another program deinitializes the console.
> With 3.0.7 cygwin1.dll it works fine. (But I want xterm256-color from 
> 3.1.x cygwin1.dll.)
> 
> Here simple examples:
> 
> 1)
> C:\Users\slasch>ls C:\Windows | less -E +G
> 
> C:\Users\slasch>^[[A
> 
> 
> 2)
> C:\Users\slasch>ls C:\cygwin64\bin | less  # then press G and q
> ...
> -rwxr-xr-x 1 slasch slasch    1940 Aug 26  2016 zcat
> -rwxr-xr-x 1 slasch slasch    1665 Aug 26  2016 zcmp
> -rwxr-xr-x 1 slasch slasch    5667 Aug 26  2016 zdiff
> -rwxr-xr-x 1 slasch slasch      29 Aug 26  2016 zegrep
> -rwxr-xr-x 1 slasch slasch      29 Aug 26  2016 zfgrep
> -rwxr-xr-x 1 slasch slasch    2038 Aug 26  2016 zforce
> -rwxr-xr-x 1 slasch slasch    7444 Aug 26  2016 zgrep
> -rwxr-xr-x 1 slasch slasch    2154 Aug 26  2016 zless
> -rwxr-xr-x 1 slasch slasch    1816 Aug 26  2016 zmore
> -rwxr-xr-x 1 slasch slasch    4392 Aug 26  2016 znew
> [K[?1l>[?1049l[23;0;0t7[3g[1;9HH[1;17HH[1;25HH[1;33HH[1;41HH[1;49HH[1;57HH[1;65HH[1;73HH[1;81HH[1;89HH[1;97HH[1;105HH[1;113HH8
> C:\Users\slasch>^[OA^[OA
> 
> 
> 3) # other PC other commands (Strawberry-Perl with "cmd.exe dir" stdout 
> forwarded to less) to show the single "escape character"(see attachment)
> total 320^[[m
> drwxr-xr-x+ 1 foo    foo                 0 Feb 13 17:40 .^[[m
> drwxr-xr-x+ 1 foo    foo                 0 Feb 13 17:42 ..^[[m
> -rwxr-xr-x  1 sadmin Administratoren 35147 Apr 30  2019 COPYING^[[m
> -rwxr-xr-x  1 sadmin Administratoren  1458 Apr 30  2019 CYGWIN_LICENSE^[[m
> -rw-r--r--  1 foo    foo              2045 Dec 16  2017 
> _autorebase.README^[[m
> -rw-r--r--  1 foo    foo              2653 Apr  5  2013 
> alternatives.README^[[m
> -rw-r--r--  1 foo    foo              1694 Jul  9  2013 autoconf.README^[[m
> -rw-r--r--  1 foo    foo              2096 Jul  9  2013 
> autoconf2.1.README^[[m
> -rw-r--r--  1 foo    foo              1806 Jul 29  2013 
> automake1.9.README^[[m
> -rw-r--r--  1 foo    foo              4227 Apr  1  2019 autossh.README^[[m
> -rw-r--r--  1 foo    foo             17474 Jan 27  2017 bash.README^[[m
> -rw-r--r--  1 sadmin Administratoren  1468 Aug  9  2010 
> build-docbook-catalog.README^[[m
> -rw-r--r--  1 foo    foo             13113 Feb  3  2017 coreutils.README^[[m
> -rw-rw----  1 foo    foo              1863 Apr 16  2013 ctags-5.8.README^[[m
> -rw-r--r--  1 foo    foo             20685 Jan 28  2015 cygrunsrv.README^[[m
> -rw-r--r--  1 sadmin Administratoren  8136 Apr 30  2019 cygserver.README^[[m
> -rw-r--r--  1 foo    foo              2303 Feb 17  2017 dash.README^[[m
> -rw-r--r--  1 foo    foo              3671 Mar 10  2016 diffstat.README^[[m
> -rw-r--r--  1 foo    foo              2749 Dec  7  2016 diffutils.README^[[m
> -rw-r--r--  1 foo    foo              1965 Oct  3 19:59 dos2unix.README^[[m
> -rw-r--r--  1 foo    foo               626 Oct 31  2014 
> editrights.README^[[m
> -rw-r--r--  1 foo    foo              4829 Mar 11  2016 findutils.README^[[m
> -rwxr-xr-x  1 foo    foo                 0 Dec 13 09:28 gawk^[[m
> :^[[K

Thanks for the report. However, I cannot reproduce problem 1 and 3.
I will submit a patch for the problem 2 shortly.

-- 
Takashi Yano <takashi.yano@nifty.ne.jp>

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