GNU bug report logs - #16048
24.3.50; String compare surprise

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Package: emacs;

Reported by: michael.albinus <at> gmx.de

Date: Wed, 4 Dec 2013 11:45:03 UTC

Severity: normal

Found in version 24.3.50

Done: Michael Albinus <michael.albinus <at> gmx.de>

Bug is archived. No further changes may be made.

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From: Josh <josh <at> foxtail.org>
To: Andreas Schwab <schwab <at> linux-m68k.org>
Cc: 16048 <at> debbugs.gnu.org, Michael Albinus <michael.albinus <at> gmx.de>
Subject: bug#16048: 24.3.50; String compare surprise
Date: Wed, 4 Dec 2013 06:00:46 -0800

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On Wed, Dec 4, 2013 at 5:07 AM, Andreas Schwab <schwab <at> linux-m68k.org>wrote:

> michael.albinus <at> gmx.de writes:
>
> > The following form evals to nil:
> >
> >   (string-equal "\377" "ΓΏ")
>
> "\377" is a unibyte string.  When converted to multibyte it yields
> "\x3fffff".


At least as of 24.3, the manual[0] suggests that such a conversion
should not occur in this case:

    You can also use hexadecimal escape sequences (`\xN') and octal
    escape sequences (`\N') in string constants.  *But beware:* If a
    string constant contains hexadecimal or octal escape sequences,
    and these escape sequences all specify unibyte characters (i.e.,
    less than 256), and there are no other literal non-ASCII
    characters or Unicode-style escape sequences in the string, then
    Emacs automatically assumes that it is a unibyte string.  That is
    to say, it assumes that all non-ASCII characters occurring in the
    string are 8-bit raw bytes.

[0] (info "(elisp) Non-ASCII in Strings")

Josh

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This bug report was last modified 11 years and 172 days ago.

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