GNU bug report logs - #7279
24.0.50; print-escape-multibyte not honored

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Helmut Eller <eller.helmut <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.0.50; print-escape-multibyte not honored
Date: Mon, 25 Oct 2010 13:39:23 +0200

This code:

(with-temp-file "/tmp/x.x"
  (let ((print-escape-multibyte nil))
    (prin1 (string ?\x03bb) (current-buffer))))

writes "\x03bb" to the file, i.e. it seems to ignore the value
of print-escape-multibyte.



In GNU Emacs 24.0.50.1 (i686-pc-linux-gnu, GTK+ Version 2.12.12)
 of 2010-10-23 on ix
Windowing system distributor `The X.Org Foundation', version 11.0.10402000
configured using `configure  '--with-gif=no''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US
  value of $XMODIFIERS: nil
  locale-coding-system: iso-latin-1-unix
  default enable-multibyte-characters: nil

Message #8 received at 7279 <at> debbugs.gnu.org (full text, mbox):

From: Andreas Schwab <schwab <at> linux-m68k.org>
To: Helmut Eller <eller.helmut <at> gmail.com>
Cc: 7279 <at> debbugs.gnu.org
Subject: Re: bug#7279: 24.0.50; print-escape-multibyte not honored
Date: Mon, 25 Oct 2010 20:02:06 +0200

Helmut Eller <eller.helmut <at> gmail.com> writes:

> This code:
>
> (with-temp-file "/tmp/x.x"
>   (let ((print-escape-multibyte nil))
>     (prin1 (string ?\x03bb) (current-buffer))))
>
> writes "\x03bb" to the file, i.e. it seems to ignore the value
> of print-escape-multibyte.

I cannot reprodoce that.  I also tried setting print-escape-multibyte to
t and got the expected effect.  Note that print-escape-multibyte is nil
by default anyway.

Andreas.

-- 
Andreas Schwab, schwab <at> linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

Message #11 received at 7279 <at> debbugs.gnu.org (full text, mbox):

From: Helmut Eller <eller.helmut <at> gmail.com>
To: Andreas Schwab <schwab <at> linux-m68k.org>
Cc: 7279 <at> debbugs.gnu.org
Subject: Re: bug#7279: 24.0.50; print-escape-multibyte not honored
Date: Mon, 25 Oct 2010 21:04:38 +0200

* Andreas Schwab [2010-10-25 18:02] writes:

> Helmut Eller <eller.helmut <at> gmail.com> writes:
>
>> This code:
>>
>> (with-temp-file "/tmp/x.x"
>>   (let ((print-escape-multibyte nil))
>>     (prin1 (string ?\x03bb) (current-buffer))))
>>
>> writes "\x03bb" to the file, i.e. it seems to ignore the value
>> of print-escape-multibyte.
>
> I cannot reprodoce that.  I also tried setting print-escape-multibyte to
> t and got the expected effect.  Note that print-escape-multibyte is nil
> by default anyway.

And this?

(with-temp-file "/tmp/x.x"
  (set-buffer-multibyte nil)
  (let ((print-escape-multibyte nil))
    (prin1 (string ?\x80) (current-buffer))))

Helmut

Message #14 received at 7279 <at> debbugs.gnu.org (full text, mbox):

From: npostavs <at> users.sourceforge.net
To: Helmut Eller <eller.helmut <at> gmail.com>
Cc: 7279 <at> debbugs.gnu.org, Andreas Schwab <schwab <at> linux-m68k.org>
Subject: Re: bug#7279: 24.0.50; print-escape-multibyte not honored
Date: Mon, 30 Jan 2017 02:12:58 -0500

tags 7279 notabug
close 7279
quit

Helmut Eller <eller.helmut <at> gmail.com> writes:

> * Andreas Schwab [2010-10-25 18:02] writes:
>
>> Helmut Eller <eller.helmut <at> gmail.com> writes:
>>
>>> This code:
>>>
>>> (with-temp-file "/tmp/x.x"
>>>   (let ((print-escape-multibyte nil))
>>>     (prin1 (string ?\x03bb) (current-buffer))))
>>>
>>> writes "\x03bb" to the file, i.e. it seems to ignore the value
>>> of print-escape-multibyte.
>>
>> I cannot reprodoce that.  I also tried setting print-escape-multibyte to
>> t and got the expected effect.  Note that print-escape-multibyte is nil
>> by default anyway.
>
> And this?
>
> (with-temp-file "/tmp/x.x"
>   (set-buffer-multibyte nil)
>   (let ((print-escape-multibyte nil))
>     (prin1 (string ?\x80) (current-buffer))))
>

You can't print a multibyte string into a unibyte buffer, this works:

(with-temp-file "/tmp/x.x"
  (set-buffer-multibyte nil)
  (let ((print-escape-multibyte nil))
    (prin1 (unibyte-string ?\x80) (current-buffer))))

or if you want to handle unicode you must choose an encoding:

(with-temp-file "/tmp/x.x"
  (set-buffer-multibyte nil)
  (let ((print-escape-multibyte nil))
    (prin1 (encode-coding-string (string ?\x03bb) 'utf-8)
           (current-buffer))))

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