PIB

そう言えば、Windows ネイティブの ipconfig, ping, nslookup などを mintty 上で動かしても文字化けしなくなって久しいんだけど、これいつからだっけ？

以前

• 20190222: Cygwin - ターミナルエミュレータと文字化け

でDOSプロンプト上だと

出力＼バイナリ	win32	cygwin
CP932	○	×
UTF-8	×	○

になってて驚いた時はまだ
mintty上だと

出力＼バイナリ	win32	cygwin
CP932	×	×
UTF-8	○	○

だったようなのだが、
今現在はどちらも

出力＼バイナリ	win32	cygwin
CP932	○	×
UTF-8	×	○

になってる。

• newlib-cygwin

の winsup/cygwin/release/ 以下探してみると

$ grep -i mbcs *

$ grep -i utf *
2.0.0:- Fix UTF-16 surrogate handling in wctomb and friends.
2.7.0:- Fix erasing UTF-8 multibyte characters in cooked mode.

$ grep -i unicode *
1.7.21:  fnmatch(3), and regcomp(3).  All Unicode chars beyond U+0100 are affected.
2.11.0:- Support Unicode 10.
2.11.0:- Fix Unicode table.
3.0:- Wctype functions updated to Unicode 11.0.

$ grep -i console *
1.7.10:- The CYGWIN=tty mode using pipes to communicate with the console in a pseudo
1.7.10:  tty-like mode has been removed.  Either just use the normal Windows console
1.7.10:- Revamp console and pseudo tty handling.  Rename /dev/ttyX to /dev/consX,
1.7.10:- Improve Ctrl-C handling in console.
1.7.11:  console window from exiting.
1.7.14:- Add mouse reporting mode 1005, 1006 and 1015 to console.
1.7.14:- Allow access of /dev/conin, /dev/conout, and /dev/console if a console
1.7.14:- Fix reporting large mouse coordinates in console window mouse reporting mode.
1.7.17:  console process is started in the background.
1.7.18:- Added Windows console cursor appearance support:
1.7.26:  handle.  Right now this excludes console windows on pre Windows 8, as well as
1.7.28:- Using gdb from a Windows console rather than a pty should no longer randomly
1.7.28:- The console buffer should no longer be cleared when the resolution of the
1.7.28:  console exceeds some magic threshold.
1.7.28:- Fix inadvertent clearing of entire console buffer on clear screen.
1.7.29:- Try harder to do the right thing in the presence of console screen buffers,
2.5.0:- Enabled console reports requested by escape sequences: Requesting primary
2.5.0:- Make buffered console characters visible to select().
2.6.0:- Handle "clear screen" escpae sequence in console window more reliable.
2.6.1:- Fix regression in console charset handling
2.7.0:- Fix handling of Alt-Numpad sequences in console handler.
2.9.0:- Fix select and read in Windows console when running under codepage 65001.
2.9.0:- Fix a clear screen issue in Windows console when running under codepage 65001.
3.1.0:  1703 or later.  Add fake 24 bit color support for legacy console,
3.1.0:- Support pseudo console in PTY. Pseudo console is a new feature
3.1.0:  in Windows 10 1809, which provides console APIs on virtual
3.1.0:  terminal. With this patch, native console applications can work
3.1.0:- Fix select() on console in canonical mode.  Return after one line is
3.1.0:- Make console I/O functions thread-safe.
3.1.2:- Fix an infinite loop in the pseudo console code.
3.1.4:- Many fixes in new pseudo console support.
3.1.5:- Fix accidental evaluation of NUL (\0) characters in xterm console output.
3.1.5:  Don't move cursor to the right in case of a NUL character in the console
3.1.5:- Fix a segfault when starting, e.g., mintty from a bash in a console
3.1.5:- Make sure pseudo tty doesn't hang if cygwin-console-helper.exe is
3.2.0:- Revamped pseudo console support.  Conditionally activating it only when
3.2.0:- In cygwin console, new thread which handles special keys/signals such
3.2.1:- Fix tab position evaluation after console window resize.
3.2.1:- Fix a regression in pseudo console handling, resulting in rlwrap not
3.2.1:  being able to start a new pseudo console.
3.2.1:- Handle two race conditions in pseudo console usage.

みたいな感じなので 3.1.0 で pseudo console と console API に対応してる辺りが怪しそうだが果たして？

$ git log cygwin-3_1_0-release -1
commit f69b2421bb385787b17aec061f538d75f272e5b9 (tag: cygwin-3_1_0-release)
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Mon Dec 16 16:39:17 2019 +0100

    Cygwin: add strtold fix to release message
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

なので、時期的には「20190222: Cygwin - ターミナルエミュレータと文字化け」の後なので、時系列は整合するんだけど、そんなに前からだっけ？

追記: 2021-06-30
これ、cmd, powershell, wsl, windows terminal でも同様だな。
「windows pseudo console "character set"」でググったら以下のような情報を見つけた。

• Entropymine / 2020-05-06: Win32 I/O character encoding supplement 1 – A Cygwin issue
• Microsoft / DevBlogs / Windows Command Line
  • 2018-06-20: Windows Command-Line: Backgrounder
  • 2018-06-27: The Evolution of the Windows Command-Line
  • 2018-07-20: Inside the Windows Console
  • 2018-08-02: Introducing the Windows Pseudo Console (ConPTY)
  • 2018-11-15: Unicode and UTF-8 Output Text Buffer
• Microsoft / Docs / Windows / Console
• mintty / wiki
  • Tips # Input/Output interaction with alien programs