Add a KUnit test for strnlen() to verify correctness across different string lengths and memory alignments.
Signed-off-by: Feng Jiang <[email protected]> --- lib/tests/string_kunit.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/lib/tests/string_kunit.c b/lib/tests/string_kunit.c index 88da97e50c8e..89fe52378442 100644 --- a/lib/tests/string_kunit.c +++ b/lib/tests/string_kunit.c @@ -129,6 +129,35 @@ static void string_test_strlen(struct kunit *test) } } +static void string_test_strnlen(struct kunit *test) +{ + char *s; + size_t len, offset; + const size_t buf_size = STRING_TEST_MAX_LEN + STRING_TEST_MAX_OFFSET + 1; + + s = kunit_kzalloc(test, buf_size, GFP_KERNEL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, s); + + memset(s, 'A', buf_size); + s[buf_size - 1] = '\0'; + + for (offset = 0; offset < STRING_TEST_MAX_OFFSET; offset++) { + for (len = 0; len <= STRING_TEST_MAX_LEN; len++) { + s[offset + len] = '\0'; + + if (len > 0) + KUNIT_EXPECT_EQ(test, strnlen(s + offset, len - 1), len - 1); + + KUNIT_EXPECT_EQ(test, strnlen(s + offset, len), len); + + KUNIT_EXPECT_EQ(test, strnlen(s + offset, len + 1), len); + KUNIT_EXPECT_EQ(test, strnlen(s + offset, len + 10), len); + + s[offset + len] = 'A'; + } + } +} + static void string_test_strchr(struct kunit *test) { const char *test_string = "abcdefghijkl"; @@ -644,6 +673,7 @@ static struct kunit_case string_test_cases[] = { KUNIT_CASE(string_test_memset32), KUNIT_CASE(string_test_memset64), KUNIT_CASE(string_test_strlen), + KUNIT_CASE(string_test_strnlen), KUNIT_CASE(string_test_strchr), KUNIT_CASE(string_test_strnchr), KUNIT_CASE(string_test_strspn), -- 2.25.1
