* BOM (byte order mark) in process stdout and stderr
@ 2015-06-25 16:41 Jürgen Hötzel
2015-06-25 17:28 ` Eli Zaretskii
0 siblings, 1 reply; 4+ messages in thread
From: Jürgen Hötzel @ 2015-06-25 16:41 UTC (permalink / raw)
To: emacs-devel
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Hi,
I compiled this C#/Mono program on an UTF-8 GNU/Linux System
using System;
public class Hello
{
static void Main()
{
Console.WriteLine("STDOUT");
Console.Error.WriteLine("STDERR");
}
}
and used this elisp code to get the process output:
(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?
Jürgen
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: BOM (byte order mark) in process stdout and stderr
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
0 siblings, 1 reply; 4+ messages in thread
From: Eli Zaretskii @ 2015-06-25 17:28 UTC (permalink / raw)
To: Jürgen Hötzel; +Cc: emacs-devel
> From: Jürgen Hötzel <juergen@hoetzel.info>
> Date: Thu, 25 Jun 2015 18:41:50 +0200
>
> (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.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: BOM (byte order mark) in process stdout and stderr
2015-06-25 17:28 ` Eli Zaretskii
@ 2015-06-25 18:37 ` Jürgen Hötzel
2015-06-25 19:37 ` Eli Zaretskii
0 siblings, 1 reply; 4+ messages in thread
From: Jürgen Hötzel @ 2015-06-25 18:37 UTC (permalink / raw)
To: Eli Zaretskii; +Cc: emacs-devel
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On Thu, Jun 25, 2015 at 7:28 PM, Eli Zaretskii <eliz@gnu.org> wrote:
> > From: Jürgen Hötzel <juergen@hoetzel.info>
> > Date: Thu, 25 Jun 2015 18:41:50 +0200
> >
> > (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
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: BOM (byte order mark) in process stdout and stderr
2015-06-25 18:37 ` Jürgen Hötzel
@ 2015-06-25 19:37 ` Eli Zaretskii
0 siblings, 0 replies; 4+ messages in thread
From: Eli Zaretskii @ 2015-06-25 19:37 UTC (permalink / raw)
To: Jürgen Hötzel; +Cc: emacs-devel
> 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.
^ permalink raw reply [flat|nested] 4+ messages in thread
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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
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