Re: [PATCH] manual: document wcwidth and wcswidth [BZ #33740]

"Andreas K. Huettel" <[email protected]> Wed, 15 Jul 2026 20:35:10 +0900

Newsgroups	gmane.comp.lib.glibc.alpha
Organization	Gentoo Linux
Message-ID	<[email protected]>

Am Mittwoch, 15. Juli 2026, 00:30:28 Japanische Normalzeit schrieb Nikola Arlotti:
> This patch documents functions wcwidth and wcswidth, solving bug
> #33740. CC'ing Arjun so he can add it to his stats for the next
> glibc contribution workshop ;)

Pure documentation enhancement.
Can still go in the release once it has a RB.

> 
> Signed-off-by: Nikola Arlotti <[email protected]>
> 
> ---
>  manual/ctype.texi | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
> 
> diff --git a/manual/ctype.texi b/manual/ctype.texi
> index d09249c6cf..0eeb3f77de 100644
> --- a/manual/ctype.texi
> +++ b/manual/ctype.texi
> @@ -380,6 +380,30 @@ by a successful call to @code{wctype}.
>  This function is declared in @file{wctype.h}.
>  @end deftypefun
>  
> +@deftypefun int wcwidth (wchar_t @var{wc})
> +@standards{POSIX, wchar.h}
> +@safety{@prelim{}@mtsafe{@mtslocale{}}@assafe{}@acsafe{}}
> +This function returns the number of collumns needed to represent
> +the wide character @var{wc}. If @var{wc} is a printable wide character,
> +the value is 0 or higher. If @var{wc} is a null-wide character (L'\0'),
> +the value is 0. Otherwise, this function returns -1.
> +
> +@pindex wchar.h
> +This function is declared in @file{wchar.h}.
> +@end deftypefun
> +
> +@deftypefun int wcswidth (const wchar_t @var{*s}, size_t @var{n})
> +@standards{POSIX, wchar.h}
> +@safety{@prelim{}@mtsafe{@mtslocale{}}@assafe{}@acsafe{}}
> +This function returns the number of collumns needed to represent
> +the wide character string pointed to by @var{*s}, but at most
> +@var{n} wide characters. If a nonprintable wide character occurs
> +among these characters, this function returns -1.
> +
> +@pindex wchar.h
> +This function is declared in @file{wchar.h}.
> +@end deftypefun
> +
>  To make it easier to use the commonly-used classification functions,
>  they are defined in the C library.  There is no need to use
>  @code{wctype} if the property string is one of the known character
> 


-- 
PD Dr. Andreas K. Hüttel
[email protected]
Gentoo Linux developer 
(council, comrel, toolchain, base-system, perl, libreoffice)
https://wiki.gentoo.org/wiki/User:Dilfridge

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