linux-kernel - Re: [PATCH] checkpatch: use utf-8 match for spell checking

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Date:   Tue, 12 Dec 2023 11:07:22 -0800
From:   Joe Perches <joe@...ches.com>
To:     Antonio Borneo <antonio.borneo@...s.st.com>,
        Andy Whitcroft <apw@...onical.com>,
        Dwaipayan Ray <dwaipayanray1@...il.com>,
        Lukas Bulwahn <lukas.bulwahn@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org,
        Clément Léger <clement.leger@...tlin.com>,
        Clément Le Goffic 
        <clement.legoffic@...s.st.com>,
        linux-stm32@...md-mailman.stormreply.com
Subject: Re: [PATCH] checkpatch: use utf-8 match for spell checking

On Tue, 2023-12-12 at 10:43 +0100, Antonio Borneo wrote:
> The current code that checks for misspelling verifies, in a more
> complex regex, if $rawline matches [^\w]($misspellings)[^\w]
> 
> Being $rawline a byte-string, a utf-8 character in $rawline can
> match the non-word-char [^\w].
> E.g.:
> 	./script/checkpatch.pl --git 81c2f059ab9
> 	WARNING: 'ment' may be misspelled - perhaps 'meant'?
> 	#36: FILE: MAINTAINERS:14360:
> 	+M:     Clément Léger <clement.leger@...tlin.com>
> 	            ^^^^
> 
> Use a utf-8 version of $rawline for spell checking.
> 
> Signed-off-by: Antonio Borneo <antonio.borneo@...s.st.com>
> Reported-by: Clément Le Goffic <clement.legoffic@...s.st.com>

Seems sensible, thanks, but:

> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
[]
> @@ -3477,7 +3477,8 @@ sub process {
>  # Check for various typo / spelling mistakes
>  		if (defined($misspellings) &&
>  		    ($in_commit_log || $line =~ /^(?:\+|Subject:)/i)) {
> -			while ($rawline =~ /(?:^|[^\w\-'`])($misspellings)(?:[^\w\-'`]|$)/gi) {
> +			my $rawline_utf8 = decode("utf8", $rawline);
> +			while ($rawline_utf8 =~ /(?:^|[^\w\-'`])($misspellings)(?:[^\w\-'`]|$)/gi) {
>  				my $typo = $1;
>  				my $blank = copy_spacing($rawline);

Maybe this needs to use $rawline_utf8 ?

>  				my $ptr = substr($blank, 0, $-[1]) . "^" x length($typo);

And may now the $fix bit will not always work properly