From: Eli Zaretskii <eliz@gnu.org>
To: "Jürgen Hötzel" <juergen@archlinux.org>
Cc: emacs-devel@gnu.org
Subject: Re: BOM (byte order mark) in process stdout and stderr
Date: Thu, 25 Jun 2015 22:37:44 +0300 [thread overview]
Message-ID: <834mlvefzr.fsf@gnu.org> (raw)
In-Reply-To: <CANmXxHMPQs3L4LnVmB=MMTdn6W35g3jUD8AQn_Y2ZHw3w+SxEQ@mail.gmail.com>
> From: Jürgen Hötzel <juergen@archlinux.org>
> Date: Thu, 25 Jun 2015 20:37:41 +0200
> Cc: emacs-devel@gnu.org
>
> > (let ((default-process-coding-system '(utf-8-with-signature .
> > utf-8-with-signature)))
> > (start-file-process
> > "BOM"
> > (generate-new-buffer "*bom-test*")
> > "~/tmp/Hello.exe"))
> >
> > This results in the following process-buffer (hexl-mode):
> >
> > 00000000: efbb bf53 5444 4f55 540a 5354 4445 5252 ...STDOUT.STDERR
> > 00000010: 0a0a 5072 6f63 6573 7320 424f 4d20 6669 ..Process BOM fi
> > 00000020: 6e69 7368 6564 0a nished.
> >
> > The stdout BOM was correctly removed but the stderr BOM is still present.
> >
> > According to
> >
> http://www.gnu.org/software/emacs/manual/html_node/elisp/Output-from-Processes.html
>
> >
> > there is now way to handle stderr separately. I made this workaround for
> the
> > Emacs fsharp-mode:
> >
> >
> https://github.com/juergenhoetzel/fsharpbinding/commit/d0d3600c38d0e9f47a621583d0fc82685feda196
>
> >
> > Are there any better solutions?
>
> You didn't tell what version of Emacs do you want this to be solved.
>
>
> GNU Emacs 24.5.1
Then I think you will have to remove the second BOM in your
application's Lisp code. start-file-process redirects both standard
output and standard error to the same file descriptor, and Emacs reads
their mix from that file descriptor. It will remove 1 BOM, but the
other will be left alone.
Alternatively, separate the standard output and standard error via
shell redirection, and then read one of them separately from a file.
prev parent reply other threads:[~2015-06-25 19:37 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-25 16:41 BOM (byte order mark) in process stdout and stderr Jürgen Hötzel
2015-06-25 17:28 ` Eli Zaretskii
2015-06-25 18:37 ` Jürgen Hötzel
2015-06-25 19:37 ` Eli Zaretskii [this message]
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