GNU bug report logs - #32236
df header corrupted with LANG=zh_TW.UTF-8 on macOS

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Chih-Hsuan Yen <yan12125 <at> gmail.com>
Subject: bug#32236: closed (Re: bug#32236: df header corrupted with
 LANG=zh_TW.UTF-8 on macOS)
Date: Fri, 27 Jul 2018 01:24:02 +0000

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Your bug report

#32236: df header corrupted with LANG=zh_TW.UTF-8 on macOS

which was filed against the coreutils package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 32236 <at> debbugs.gnu.org.

-- 
32236: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=32236
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Pádraig Brady <P <at> draigBrady.com>,
 Chih-Hsuan Yen <yan12125 <at> gmail.com>, Bruno Haible <bruno <at> clisp.org>
Cc: 32236-done <at> debbugs.gnu.org, bug-gnulib <bug-gnulib <at> gnu.org>
Subject: Re: bug#32236: df header corrupted with LANG=zh_TW.UTF-8 on macOS
Date: Thu, 26 Jul 2018 18:23:02 -0700

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Pádraig Brady wrote:
> I've pushed the c_iscntrl patch since it's simplest
> and probably most appropriate patch for an existing release.

Yes, that makes sense for a quick patch. However, for the next release I think 
it'd be better to catch encoding errors and multibyte control characters, given 
the problems noted. I installed the attached further patch to try to do this. 
This fixes the problem that Bruno noted, along with two others; my earlier patch 
neglected the possibility that mbrtowc can return 0, and it incorrectly assumed 
wide control characters always have a single-byte representation.

Either way the original bug appears to be fix so I'm boldly closing the bug report.

[0001-df-avoid-multibyte-character-corruption-on-macOS.patch (text/x-patch, attachment)]

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From: Chih-Hsuan Yen <yan12125 <at> gmail.com>
To: bug-coreutils <at> gnu.org
Subject: df header corrupted with LANG=zh_TW.UTF-8 on macOS
Date: Sat, 21 Jul 2018 22:20:04 +0800

Hi coreutils developers,

I'm using coreutils on macOS High Sierra (10.13). I noticed that with
`LANG=zh_TW.UTF-8`, `df` output is corrupted.

�?�?系統 容�?? 已�?� �?��?� 已�?�% �??�?�?
/dev/disk1s1    234G  151G    81G    65% /
/dev/disk1s4    234G  2.1G    81G     3% /private/var/vm

(I'm not sure if other mail agents can display those characters
correctly or not. See my blog post [1] for the exact output.)

Seems it's similar to bug#25630 [2], which is not resolved. I guess
the reason of my issue is that iscntrl() is broken on macOS High
Sierra, so in hide_problematic_chars(), some bytes in the Chinese
header is replaced with a question mark. I managed to patch coreutils
[3] to make `df` work. Could you have a look? Thanks!

Best,

Chih-Hsuan Yen

[1] https://blog.chyen.cc/posts/2018/06/23/mac-df-chinese.html
[2] http://lists.gnu.org/archive/html/bug-coreutils/2017-02/msg00008.html
[3] https://github.com/yan12125/macports-ports/blob/fix-coreutils-df-chinese/sysutils/coreutils/files/patch-df.diff

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