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Wed, 24 Sep 2025 07:51:55 -0700 (PDT) From: Bartosz Golaszewski Date: Wed, 24 Sep 2025 16:51:30 +0200 Subject: [PATCH RFC 2/9] string: provide strends() Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250924-gpio-shared-v1-2-775e7efeb1a3@linaro.org> References: <20250924-gpio-shared-v1-0-775e7efeb1a3@linaro.org> In-Reply-To: <20250924-gpio-shared-v1-0-775e7efeb1a3@linaro.org> To: Kees Cook , Mika Westerberg , Dmitry Torokhov , Andrew Morton , Linus Walleij , Manivannan Sadhasivam , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Saravana Kannan , Greg Kroah-Hartman , Andy Shevchenko , Bartosz Golaszewski , Catalin Marinas , Will Deacon , Srinivas Kandagatla , Liam Girdwood , Mark Brown , Jaroslav Kysela , Takashi Iwai Cc: linux-hardening@vger.kernel.org, linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sound@vger.kernel.org, linux-arm-msm@vger.kernel.org, Bartosz Golaszewski X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; 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a=openpgp; fpr=169DEB6C0BC3C46013D2C79F11A72EA01471D772 From: Bartosz Golaszewski Implement a function for checking if a string ends with a different string and add its kunit test cases. Signed-off-by: Bartosz Golaszewski --- include/linux/string.h | 2 ++ lib/string.c | 19 +++++++++++++++++++ lib/tests/string_kunit.c | 13 +++++++++++++ 3 files changed, 34 insertions(+) diff --git a/include/linux/string.h b/include/linux/string.h index fdd3442c6bcbd786e177b6e87358e1065a0ffafc..16149404fc3aed535c094b9550f= 7bd7c9b44a0c9 100644 --- a/include/linux/string.h +++ b/include/linux/string.h @@ -562,4 +562,6 @@ static inline bool strstarts(const char *str, const cha= r *prefix) return strncmp(str, prefix, strlen(prefix)) =3D=3D 0; } =20 +bool strends(const char *str, const char *suffix); + #endif /* _LINUX_STRING_H_ */ diff --git a/lib/string.c b/lib/string.c index b632c71df1a5061256f556c40a30587cf45dce18..ac18313d9c52b38132f0bfdd952= cdec6b1354d76 100644 --- a/lib/string.c +++ b/lib/string.c @@ -880,3 +880,22 @@ void *memchr_inv(const void *start, int c, size_t byte= s) return check_bytes8(start, value, bytes % 8); } EXPORT_SYMBOL(memchr_inv); + +/** + * strends - Check if a string ends with another string. + * @str - NULL-terminated string to check against @suffix + * @suffix - NULL-terminated string defining the suffix to look for in @str + * + * Returns: + * True if @str ends with @suffix. False in all other cases. + */ +bool strends(const char *str, const char *suffix) +{ + unsigned int str_len =3D strlen(str), suffix_len =3D strlen(suffix); + + if (str_len < suffix_len) + return false; + + return !(strcmp(str + str_len - suffix_len, suffix)); +} +EXPORT_SYMBOL(strends); diff --git a/lib/tests/string_kunit.c b/lib/tests/string_kunit.c index 0ed7448a26d3aa0fe9e2a6a894d4c49c2c0b86e0..f9a8e557ba7734c9848d58ff986= 407d8000f52ee 100644 --- a/lib/tests/string_kunit.c +++ b/lib/tests/string_kunit.c @@ -602,6 +602,18 @@ static void string_test_memtostr(struct kunit *test) KUNIT_EXPECT_EQ(test, dest[7], '\0'); } =20 +static void string_test_strends(struct kunit *test) +{ + KUNIT_EXPECT_TRUE(test, strends("foo-bar", "bar")); + KUNIT_EXPECT_TRUE(test, strends("foo-bar", "-bar")); + KUNIT_EXPECT_TRUE(test, strends("foobar", "foobar")); + KUNIT_EXPECT_TRUE(test, strends("foobar", "")); + KUNIT_EXPECT_FALSE(test, strends("bar", "foobar")); + KUNIT_EXPECT_FALSE(test, strends("", "foo")); + KUNIT_EXPECT_FALSE(test, strends("foobar", "ba")); + KUNIT_EXPECT_TRUE(test, strends("", "")); +} + static struct kunit_case string_test_cases[] =3D { KUNIT_CASE(string_test_memset16), KUNIT_CASE(string_test_memset32), @@ -623,6 +635,7 @@ static struct kunit_case string_test_cases[] =3D { KUNIT_CASE(string_test_strlcat), KUNIT_CASE(string_test_strtomem), KUNIT_CASE(string_test_memtostr), + KUNIT_CASE(string_test_strends), {} }; =20 --=20 2.48.1