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Diffstat (limited to 'lib/strscpy_kunit.c')
| -rw-r--r-- | lib/strscpy_kunit.c | 143 |
1 files changed, 0 insertions, 143 deletions
diff --git a/lib/strscpy_kunit.c b/lib/strscpy_kunit.c deleted file mode 100644 index b6d1d93a88..0000000000 --- a/lib/strscpy_kunit.c +++ /dev/null @@ -1,143 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0+ -/* - * Kernel module for testing 'strscpy' family of functions. - */ - -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt - -#include <kunit/test.h> -#include <linux/string.h> - -/** - * strscpy_check() - Run a specific test case. - * @test: KUnit test context pointer - * @src: Source string, argument to strscpy_pad() - * @count: Size of destination buffer, argument to strscpy_pad() - * @expected: Expected return value from call to strscpy_pad() - * @chars: Number of characters from the src string expected to be - * written to the dst buffer. - * @terminator: 1 if there should be a terminating null byte 0 otherwise. - * @pad: Number of pad characters expected (in the tail of dst buffer). - * (@pad does not include the null terminator byte.) - * - * Calls strscpy_pad() and verifies the return value and state of the - * destination buffer after the call returns. - */ -static void strscpy_check(struct kunit *test, char *src, int count, - int expected, int chars, int terminator, int pad) -{ - int nr_bytes_poison; - int max_expected; - int max_count; - int written; - char buf[6]; - int index, i; - const char POISON = 'z'; - - KUNIT_ASSERT_TRUE_MSG(test, src != NULL, - "null source string not supported"); - - memset(buf, POISON, sizeof(buf)); - /* Future proofing test suite, validate args */ - max_count = sizeof(buf) - 2; /* Space for null and to verify overflow */ - max_expected = count - 1; /* Space for the null */ - - KUNIT_ASSERT_LE_MSG(test, count, max_count, - "count (%d) is too big (%d) ... aborting", count, max_count); - KUNIT_EXPECT_LE_MSG(test, expected, max_expected, - "expected (%d) is bigger than can possibly be returned (%d)", - expected, max_expected); - - written = strscpy_pad(buf, src, count); - KUNIT_ASSERT_EQ(test, written, expected); - - if (count && written == -E2BIG) { - KUNIT_ASSERT_EQ_MSG(test, 0, strncmp(buf, src, count - 1), - "buffer state invalid for -E2BIG"); - KUNIT_ASSERT_EQ_MSG(test, buf[count - 1], '\0', - "too big string is not null terminated correctly"); - } - - for (i = 0; i < chars; i++) - KUNIT_ASSERT_EQ_MSG(test, buf[i], src[i], - "buf[i]==%c != src[i]==%c", buf[i], src[i]); - - if (terminator) - KUNIT_ASSERT_EQ_MSG(test, buf[count - 1], '\0', - "string is not null terminated correctly"); - - for (i = 0; i < pad; i++) { - index = chars + terminator + i; - KUNIT_ASSERT_EQ_MSG(test, buf[index], '\0', - "padding missing at index: %d", i); - } - - nr_bytes_poison = sizeof(buf) - chars - terminator - pad; - for (i = 0; i < nr_bytes_poison; i++) { - index = sizeof(buf) - 1 - i; /* Check from the end back */ - KUNIT_ASSERT_EQ_MSG(test, buf[index], POISON, - "poison value missing at index: %d", i); - } -} - -static void test_strscpy(struct kunit *test) -{ - char dest[8]; - - /* - * strscpy_check() uses a destination buffer of size 6 and needs at - * least 2 characters spare (one for null and one to check for - * overflow). This means we should only call tc() with - * strings up to a maximum of 4 characters long and 'count' - * should not exceed 4. To test with longer strings increase - * the buffer size in tc(). - */ - - /* strscpy_check(test, src, count, expected, chars, terminator, pad) */ - strscpy_check(test, "a", 0, -E2BIG, 0, 0, 0); - strscpy_check(test, "", 0, -E2BIG, 0, 0, 0); - - strscpy_check(test, "a", 1, -E2BIG, 0, 1, 0); - strscpy_check(test, "", 1, 0, 0, 1, 0); - - strscpy_check(test, "ab", 2, -E2BIG, 1, 1, 0); - strscpy_check(test, "a", 2, 1, 1, 1, 0); - strscpy_check(test, "", 2, 0, 0, 1, 1); - - strscpy_check(test, "abc", 3, -E2BIG, 2, 1, 0); - strscpy_check(test, "ab", 3, 2, 2, 1, 0); - strscpy_check(test, "a", 3, 1, 1, 1, 1); - strscpy_check(test, "", 3, 0, 0, 1, 2); - - strscpy_check(test, "abcd", 4, -E2BIG, 3, 1, 0); - strscpy_check(test, "abc", 4, 3, 3, 1, 0); - strscpy_check(test, "ab", 4, 2, 2, 1, 1); - strscpy_check(test, "a", 4, 1, 1, 1, 2); - strscpy_check(test, "", 4, 0, 0, 1, 3); - - /* Compile-time-known source strings. */ - KUNIT_EXPECT_EQ(test, strscpy(dest, "", ARRAY_SIZE(dest)), 0); - KUNIT_EXPECT_EQ(test, strscpy(dest, "", 3), 0); - KUNIT_EXPECT_EQ(test, strscpy(dest, "", 1), 0); - KUNIT_EXPECT_EQ(test, strscpy(dest, "", 0), -E2BIG); - KUNIT_EXPECT_EQ(test, strscpy(dest, "Fixed", ARRAY_SIZE(dest)), 5); - KUNIT_EXPECT_EQ(test, strscpy(dest, "Fixed", 3), -E2BIG); - KUNIT_EXPECT_EQ(test, strscpy(dest, "Fixed", 1), -E2BIG); - KUNIT_EXPECT_EQ(test, strscpy(dest, "Fixed", 0), -E2BIG); - KUNIT_EXPECT_EQ(test, strscpy(dest, "This is too long", ARRAY_SIZE(dest)), -E2BIG); -} - -static struct kunit_case strscpy_test_cases[] = { - KUNIT_CASE(test_strscpy), - {} -}; - -static struct kunit_suite strscpy_test_suite = { - .name = "strscpy", - .test_cases = strscpy_test_cases, -}; - -kunit_test_suite(strscpy_test_suite); - -MODULE_AUTHOR("Tobin C. Harding <tobin@kernel.org>"); -MODULE_LICENSE("GPL"); |