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string: provide strends() 

Implement a function for checking if a string ends with a different
string and add its kunit test cases.

Acked-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20251112-gpio-shared-v4-1-b51f97b1abd8@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
This commit is contained in:
Bartosz Golaszewski 2025-11-12 14:55:30 +01:00
parent 3a86608788
commit 197b3f3c70
2 changed files with 31 additions and 0 deletions
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18
include/linux/string.h
View File

@ -562,4 +562,22 @@ static inline bool strstarts(const char *str, const char *prefix)
return strncmp(str, prefix, strlen(prefix)) == 0;
}
/**
* 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.
*/
static inline bool strends(const char *str, const char *suffix)
{
unsigned int str_len = strlen(str), suffix_len = strlen(suffix);
if (str_len < suffix_len)
return false;
return !(strcmp(str + str_len - suffix_len, suffix));
}
#endif /* _LINUX_STRING_H_ */

13
lib/tests/string_kunit.c
View File

@ -602,6 +602,18 @@ static void string_test_memtostr(struct kunit *test)
KUNIT_EXPECT_EQ(test, dest[7], '\0');
}
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[] = {
KUNIT_CASE(string_test_memset16),
KUNIT_CASE(string_test_memset32),
@ -623,6 +635,7 @@ static struct kunit_case string_test_cases[] = {
KUNIT_CASE(string_test_strlcat),
KUNIT_CASE(string_test_strtomem),
KUNIT_CASE(string_test_memtostr),
KUNIT_CASE(string_test_strends),
{}
};