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From:   Antonio Borneo <antonio.borneo@foss.st.com>
To:     Andy Whitcroft <apw@canonical.com>, Joe Perches <joe@perches.com>,
        Dwaipayan Ray <dwaipayanray1@gmail.com>,
        Lukas Bulwahn <lukas.bulwahn@gmail.com>
CC:     Antonio Borneo <antonio.borneo@foss.st.com>,
        <linux-kernel@vger.kernel.org>,
        =?UTF-8?q?Cl=C3=A9ment=20L=C3=A9ger?= <clement.leger@bootlin.com>,
        =?UTF-8?q?Cl=C3=A9ment=20Le=20Goffic?= 
        <clement.legoffic@foss.st.com>,
        <linux-stm32@st-md-mailman.stormreply.com>
Subject: [PATCH] checkpatch: use utf-8 match for spell checking
Date:   Tue, 12 Dec 2023 10:43:10 +0100
Message-ID: <20231212094310.3633-1-antonio.borneo@foss.st.com>
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Precedence: bulk

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@bootlin.com>
	            ^^^^

Use a utf-8 version of $rawline for spell checking.

Signed-off-by: Antonio Borneo <antonio.borneo@foss.st.com>
Reported-by: Clément Le Goffic <clement.legoffic@foss.st.com>
---
 scripts/checkpatch.pl | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 25fdb7fda112..58646bd6ef56 100755
--- 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);
 				my $ptr = substr($blank, 0, $-[1]) . "^" x length($typo);

base-commit: b85ea95d086471afb4ad062012a4d73cd328fa86
-- 
2.42.0