--- /dev/null
- char nonstring[7] = { 'a', 'b', 'c', 'd', 'e', 'f', 'g' };
- char nonstring_small[3] = { 'a', 'b', 'c' };
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Test cases for string functions.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <kunit/test.h>
+#include <linux/module.h>
+#include <linux/printk.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+
+#define STRCMP_LARGE_BUF_LEN 2048
+#define STRCMP_CHANGE_POINT 1337
+#define STRCMP_TEST_EXPECT_EQUAL(test, fn, ...) KUNIT_EXPECT_EQ(test, fn(__VA_ARGS__), 0)
+#define STRCMP_TEST_EXPECT_LOWER(test, fn, ...) KUNIT_EXPECT_LT(test, fn(__VA_ARGS__), 0)
+#define STRCMP_TEST_EXPECT_GREATER(test, fn, ...) KUNIT_EXPECT_GT(test, fn(__VA_ARGS__), 0)
+
+static void string_test_memset16(struct kunit *test)
+{
+ unsigned i, j, k;
+ u16 v, *p;
+
+ p = kunit_kzalloc(test, 256 * 2 * 2, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, p);
+
+ for (i = 0; i < 256; i++) {
+ for (j = 0; j < 256; j++) {
+ memset(p, 0xa1, 256 * 2 * sizeof(v));
+ memset16(p + i, 0xb1b2, j);
+ for (k = 0; k < 512; k++) {
+ v = p[k];
+ if (k < i) {
+ KUNIT_ASSERT_EQ_MSG(test, v, 0xa1a1,
+ "i:%d j:%d k:%d", i, j, k);
+ } else if (k < i + j) {
+ KUNIT_ASSERT_EQ_MSG(test, v, 0xb1b2,
+ "i:%d j:%d k:%d", i, j, k);
+ } else {
+ KUNIT_ASSERT_EQ_MSG(test, v, 0xa1a1,
+ "i:%d j:%d k:%d", i, j, k);
+ }
+ }
+ }
+ }
+}
+
+static void string_test_memset32(struct kunit *test)
+{
+ unsigned i, j, k;
+ u32 v, *p;
+
+ p = kunit_kzalloc(test, 256 * 2 * 4, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, p);
+
+ for (i = 0; i < 256; i++) {
+ for (j = 0; j < 256; j++) {
+ memset(p, 0xa1, 256 * 2 * sizeof(v));
+ memset32(p + i, 0xb1b2b3b4, j);
+ for (k = 0; k < 512; k++) {
+ v = p[k];
+ if (k < i) {
+ KUNIT_ASSERT_EQ_MSG(test, v, 0xa1a1a1a1,
+ "i:%d j:%d k:%d", i, j, k);
+ } else if (k < i + j) {
+ KUNIT_ASSERT_EQ_MSG(test, v, 0xb1b2b3b4,
+ "i:%d j:%d k:%d", i, j, k);
+ } else {
+ KUNIT_ASSERT_EQ_MSG(test, v, 0xa1a1a1a1,
+ "i:%d j:%d k:%d", i, j, k);
+ }
+ }
+ }
+ }
+}
+
+static void string_test_memset64(struct kunit *test)
+{
+ unsigned i, j, k;
+ u64 v, *p;
+
+ p = kunit_kzalloc(test, 256 * 2 * 8, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, p);
+
+ for (i = 0; i < 256; i++) {
+ for (j = 0; j < 256; j++) {
+ memset(p, 0xa1, 256 * 2 * sizeof(v));
+ memset64(p + i, 0xb1b2b3b4b5b6b7b8ULL, j);
+ for (k = 0; k < 512; k++) {
+ v = p[k];
+ if (k < i) {
+ KUNIT_ASSERT_EQ_MSG(test, v, 0xa1a1a1a1a1a1a1a1ULL,
+ "i:%d j:%d k:%d", i, j, k);
+ } else if (k < i + j) {
+ KUNIT_ASSERT_EQ_MSG(test, v, 0xb1b2b3b4b5b6b7b8ULL,
+ "i:%d j:%d k:%d", i, j, k);
+ } else {
+ KUNIT_ASSERT_EQ_MSG(test, v, 0xa1a1a1a1a1a1a1a1ULL,
+ "i:%d j:%d k:%d", i, j, k);
+ }
+ }
+ }
+ }
+}
+
+static void string_test_strchr(struct kunit *test)
+{
+ const char *test_string = "abcdefghijkl";
+ const char *empty_string = "";
+ char *result;
+ int i;
+
+ for (i = 0; i < strlen(test_string) + 1; i++) {
+ result = strchr(test_string, test_string[i]);
+ KUNIT_ASSERT_EQ_MSG(test, result - test_string, i,
+ "char:%c", 'a' + i);
+ }
+
+ result = strchr(empty_string, '\0');
+ KUNIT_ASSERT_PTR_EQ(test, result, empty_string);
+
+ result = strchr(empty_string, 'a');
+ KUNIT_ASSERT_NULL(test, result);
+
+ result = strchr(test_string, 'z');
+ KUNIT_ASSERT_NULL(test, result);
+}
+
+static void string_test_strnchr(struct kunit *test)
+{
+ const char *test_string = "abcdefghijkl";
+ const char *empty_string = "";
+ char *result;
+ int i, j;
+
+ for (i = 0; i < strlen(test_string) + 1; i++) {
+ for (j = 0; j < strlen(test_string) + 2; j++) {
+ result = strnchr(test_string, j, test_string[i]);
+ if (j <= i) {
+ KUNIT_ASSERT_NULL_MSG(test, result,
+ "char:%c i:%d j:%d", 'a' + i, i, j);
+ } else {
+ KUNIT_ASSERT_EQ_MSG(test, result - test_string, i,
+ "char:%c i:%d j:%d", 'a' + i, i, j);
+ }
+ }
+ }
+
+ result = strnchr(empty_string, 0, '\0');
+ KUNIT_ASSERT_NULL(test, result);
+
+ result = strnchr(empty_string, 1, '\0');
+ KUNIT_ASSERT_PTR_EQ(test, result, empty_string);
+
+ result = strnchr(empty_string, 1, 'a');
+ KUNIT_ASSERT_NULL(test, result);
+
+ result = strnchr(NULL, 0, '\0');
+ KUNIT_ASSERT_NULL(test, result);
+}
+
+static void string_test_strspn(struct kunit *test)
+{
+ static const struct strspn_test {
+ const char str[16];
+ const char accept[16];
+ const char reject[16];
+ unsigned a;
+ unsigned r;
+ } tests[] = {
+ { "foobar", "", "", 0, 6 },
+ { "abba", "abc", "ABBA", 4, 4 },
+ { "abba", "a", "b", 1, 1 },
+ { "", "abc", "abc", 0, 0},
+ };
+ const struct strspn_test *s = tests;
+ size_t i;
+
+ for (i = 0; i < ARRAY_SIZE(tests); ++i, ++s) {
+ KUNIT_ASSERT_EQ_MSG(test, s->a, strspn(s->str, s->accept),
+ "i:%zu", i);
+ KUNIT_ASSERT_EQ_MSG(test, s->r, strcspn(s->str, s->reject),
+ "i:%zu", i);
+ }
+}
+
+static char strcmp_buffer1[STRCMP_LARGE_BUF_LEN];
+static char strcmp_buffer2[STRCMP_LARGE_BUF_LEN];
+
+static void strcmp_fill_buffers(char fill1, char fill2)
+{
+ memset(strcmp_buffer1, fill1, STRCMP_LARGE_BUF_LEN);
+ memset(strcmp_buffer2, fill2, STRCMP_LARGE_BUF_LEN);
+ strcmp_buffer1[STRCMP_LARGE_BUF_LEN - 1] = 0;
+ strcmp_buffer2[STRCMP_LARGE_BUF_LEN - 1] = 0;
+}
+
+static void string_test_strcmp(struct kunit *test)
+{
+ /* Equal strings */
+ STRCMP_TEST_EXPECT_EQUAL(test, strcmp, "Hello, Kernel!", "Hello, Kernel!");
+ /* First string is lexicographically less than the second */
+ STRCMP_TEST_EXPECT_LOWER(test, strcmp, "Hello, KUnit!", "Hello, Kernel!");
+ /* First string is lexicographically larger than the second */
+ STRCMP_TEST_EXPECT_GREATER(test, strcmp, "Hello, Kernel!", "Hello, KUnit!");
+ /* Empty string is always lexicographically less than any non-empty string */
+ STRCMP_TEST_EXPECT_LOWER(test, strcmp, "", "Non-empty string");
+ /* Two empty strings should be equal */
+ STRCMP_TEST_EXPECT_EQUAL(test, strcmp, "", "");
+ /* Compare two strings which have only one char difference */
+ STRCMP_TEST_EXPECT_LOWER(test, strcmp, "Abacaba", "Abadaba");
+ /* Compare two strings which have the same prefix*/
+ STRCMP_TEST_EXPECT_LOWER(test, strcmp, "Just a string", "Just a string and something else");
+}
+
+static void string_test_strcmp_long_strings(struct kunit *test)
+{
+ strcmp_fill_buffers('B', 'B');
+ STRCMP_TEST_EXPECT_EQUAL(test, strcmp, strcmp_buffer1, strcmp_buffer2);
+
+ strcmp_buffer1[STRCMP_CHANGE_POINT] = 'A';
+ STRCMP_TEST_EXPECT_LOWER(test, strcmp, strcmp_buffer1, strcmp_buffer2);
+
+ strcmp_buffer1[STRCMP_CHANGE_POINT] = 'C';
+ STRCMP_TEST_EXPECT_GREATER(test, strcmp, strcmp_buffer1, strcmp_buffer2);
+}
+
+static void string_test_strncmp(struct kunit *test)
+{
+ /* Equal strings */
+ STRCMP_TEST_EXPECT_EQUAL(test, strncmp, "Hello, KUnit!", "Hello, KUnit!", 13);
+ /* First string is lexicographically less than the second */
+ STRCMP_TEST_EXPECT_LOWER(test, strncmp, "Hello, KUnit!", "Hello, Kernel!", 13);
+ /* Result is always 'equal' when count = 0 */
+ STRCMP_TEST_EXPECT_EQUAL(test, strncmp, "Hello, Kernel!", "Hello, KUnit!", 0);
+ /* Strings with common prefix are equal if count = length of prefix */
+ STRCMP_TEST_EXPECT_EQUAL(test, strncmp, "Abacaba", "Abadaba", 3);
+ /* Strings with common prefix are not equal when count = length of prefix + 1 */
+ STRCMP_TEST_EXPECT_LOWER(test, strncmp, "Abacaba", "Abadaba", 4);
+ /* If one string is a prefix of another, the shorter string is lexicographically smaller */
+ STRCMP_TEST_EXPECT_LOWER(test, strncmp, "Just a string", "Just a string and something else",
+ strlen("Just a string and something else"));
+ /*
+ * If one string is a prefix of another, and we check first length
+ * of prefix chars, the result is 'equal'
+ */
+ STRCMP_TEST_EXPECT_EQUAL(test, strncmp, "Just a string", "Just a string and something else",
+ strlen("Just a string"));
+}
+
+static void string_test_strncmp_long_strings(struct kunit *test)
+{
+ strcmp_fill_buffers('B', 'B');
+ STRCMP_TEST_EXPECT_EQUAL(test, strncmp, strcmp_buffer1,
+ strcmp_buffer2, STRCMP_LARGE_BUF_LEN);
+
+ strcmp_buffer1[STRCMP_CHANGE_POINT] = 'A';
+ STRCMP_TEST_EXPECT_LOWER(test, strncmp, strcmp_buffer1,
+ strcmp_buffer2, STRCMP_LARGE_BUF_LEN);
+
+ strcmp_buffer1[STRCMP_CHANGE_POINT] = 'C';
+ STRCMP_TEST_EXPECT_GREATER(test, strncmp, strcmp_buffer1,
+ strcmp_buffer2, STRCMP_LARGE_BUF_LEN);
+ /* the strings are equal up to STRCMP_CHANGE_POINT */
+ STRCMP_TEST_EXPECT_EQUAL(test, strncmp, strcmp_buffer1,
+ strcmp_buffer2, STRCMP_CHANGE_POINT);
+ STRCMP_TEST_EXPECT_GREATER(test, strncmp, strcmp_buffer1,
+ strcmp_buffer2, STRCMP_CHANGE_POINT + 1);
+}
+
+static void string_test_strcasecmp(struct kunit *test)
+{
+ /* Same strings in different case should be equal */
+ STRCMP_TEST_EXPECT_EQUAL(test, strcasecmp, "Hello, Kernel!", "HeLLO, KErNeL!");
+ /* Empty strings should be equal */
+ STRCMP_TEST_EXPECT_EQUAL(test, strcasecmp, "", "");
+ /* Despite ascii code for 'a' is larger than ascii code for 'B', 'a' < 'B' */
+ STRCMP_TEST_EXPECT_LOWER(test, strcasecmp, "a", "B");
+ STRCMP_TEST_EXPECT_GREATER(test, strcasecmp, "B", "a");
+ /* Special symbols and numbers should be processed correctly */
+ STRCMP_TEST_EXPECT_EQUAL(test, strcasecmp, "-+**.1230ghTTT~^", "-+**.1230Ghttt~^");
+}
+
+static void string_test_strcasecmp_long_strings(struct kunit *test)
+{
+ strcmp_fill_buffers('b', 'B');
+ STRCMP_TEST_EXPECT_EQUAL(test, strcasecmp, strcmp_buffer1, strcmp_buffer2);
+
+ strcmp_buffer1[STRCMP_CHANGE_POINT] = 'a';
+ STRCMP_TEST_EXPECT_LOWER(test, strcasecmp, strcmp_buffer1, strcmp_buffer2);
+
+ strcmp_buffer1[STRCMP_CHANGE_POINT] = 'C';
+ STRCMP_TEST_EXPECT_GREATER(test, strcasecmp, strcmp_buffer1, strcmp_buffer2);
+}
+
+static void string_test_strncasecmp(struct kunit *test)
+{
+ /* Same strings in different case should be equal */
+ STRCMP_TEST_EXPECT_EQUAL(test, strncasecmp, "AbAcAbA", "Abacaba", strlen("Abacaba"));
+ /* strncasecmp should check 'count' chars only */
+ STRCMP_TEST_EXPECT_EQUAL(test, strncasecmp, "AbaCaBa", "abaCaDa", 5);
+ STRCMP_TEST_EXPECT_LOWER(test, strncasecmp, "a", "B", 1);
+ STRCMP_TEST_EXPECT_GREATER(test, strncasecmp, "B", "a", 1);
+ /* Result is always 'equal' when count = 0 */
+ STRCMP_TEST_EXPECT_EQUAL(test, strncasecmp, "Abacaba", "Not abacaba", 0);
+}
+
+static void string_test_strncasecmp_long_strings(struct kunit *test)
+{
+ strcmp_fill_buffers('b', 'B');
+ STRCMP_TEST_EXPECT_EQUAL(test, strncasecmp, strcmp_buffer1,
+ strcmp_buffer2, STRCMP_LARGE_BUF_LEN);
+
+ strcmp_buffer1[STRCMP_CHANGE_POINT] = 'a';
+ STRCMP_TEST_EXPECT_LOWER(test, strncasecmp, strcmp_buffer1,
+ strcmp_buffer2, STRCMP_LARGE_BUF_LEN);
+
+ strcmp_buffer1[STRCMP_CHANGE_POINT] = 'C';
+ STRCMP_TEST_EXPECT_GREATER(test, strncasecmp, strcmp_buffer1,
+ strcmp_buffer2, STRCMP_LARGE_BUF_LEN);
+
+ STRCMP_TEST_EXPECT_EQUAL(test, strncasecmp, strcmp_buffer1,
+ strcmp_buffer2, STRCMP_CHANGE_POINT);
+ STRCMP_TEST_EXPECT_GREATER(test, strncasecmp, strcmp_buffer1,
+ strcmp_buffer2, STRCMP_CHANGE_POINT + 1);
+}
+
+/**
+ * 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 string_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 volatile int unconst;
+
+static void string_test_strcat(struct kunit *test)
+{
+ char dest[8];
+
+ /* Destination is terminated. */
+ memset(dest, 0, sizeof(dest));
+ KUNIT_EXPECT_EQ(test, strlen(dest), 0);
+ /* Empty copy does nothing. */
+ KUNIT_EXPECT_TRUE(test, strcat(dest, "") == dest);
+ KUNIT_EXPECT_STREQ(test, dest, "");
+ /* 4 characters copied in, stops at %NUL. */
+ KUNIT_EXPECT_TRUE(test, strcat(dest, "four\000123") == dest);
+ KUNIT_EXPECT_STREQ(test, dest, "four");
+ KUNIT_EXPECT_EQ(test, dest[5], '\0');
+ /* 2 more characters copied in okay. */
+ KUNIT_EXPECT_TRUE(test, strcat(dest, "AB") == dest);
+ KUNIT_EXPECT_STREQ(test, dest, "fourAB");
+}
+
+static void string_test_strncat(struct kunit *test)
+{
+ char dest[8];
+
+ /* Destination is terminated. */
+ memset(dest, 0, sizeof(dest));
+ KUNIT_EXPECT_EQ(test, strlen(dest), 0);
+ /* Empty copy of size 0 does nothing. */
+ KUNIT_EXPECT_TRUE(test, strncat(dest, "", 0 + unconst) == dest);
+ KUNIT_EXPECT_STREQ(test, dest, "");
+ /* Empty copy of size 1 does nothing too. */
+ KUNIT_EXPECT_TRUE(test, strncat(dest, "", 1 + unconst) == dest);
+ KUNIT_EXPECT_STREQ(test, dest, "");
+ /* Copy of max 0 characters should do nothing. */
+ KUNIT_EXPECT_TRUE(test, strncat(dest, "asdf", 0 + unconst) == dest);
+ KUNIT_EXPECT_STREQ(test, dest, "");
+
+ /* 4 characters copied in, even if max is 8. */
+ KUNIT_EXPECT_TRUE(test, strncat(dest, "four\000123", 8 + unconst) == dest);
+ KUNIT_EXPECT_STREQ(test, dest, "four");
+ KUNIT_EXPECT_EQ(test, dest[5], '\0');
+ KUNIT_EXPECT_EQ(test, dest[6], '\0');
+ /* 2 characters copied in okay, 2 ignored. */
+ KUNIT_EXPECT_TRUE(test, strncat(dest, "ABCD", 2 + unconst) == dest);
+ KUNIT_EXPECT_STREQ(test, dest, "fourAB");
+}
+
+static void string_test_strlcat(struct kunit *test)
+{
+ char dest[8] = "";
+ int len = sizeof(dest) + unconst;
+
+ /* Destination is terminated. */
+ KUNIT_EXPECT_EQ(test, strlen(dest), 0);
+ /* Empty copy is size 0. */
+ KUNIT_EXPECT_EQ(test, strlcat(dest, "", len), 0);
+ KUNIT_EXPECT_STREQ(test, dest, "");
+ /* Size 1 should keep buffer terminated, report size of source only. */
+ KUNIT_EXPECT_EQ(test, strlcat(dest, "four", 1 + unconst), 4);
+ KUNIT_EXPECT_STREQ(test, dest, "");
+
+ /* 4 characters copied in. */
+ KUNIT_EXPECT_EQ(test, strlcat(dest, "four", len), 4);
+ KUNIT_EXPECT_STREQ(test, dest, "four");
+ /* 2 characters copied in okay, gets to 6 total. */
+ KUNIT_EXPECT_EQ(test, strlcat(dest, "AB", len), 6);
+ KUNIT_EXPECT_STREQ(test, dest, "fourAB");
+ /* 2 characters ignored if max size (7) reached. */
+ KUNIT_EXPECT_EQ(test, strlcat(dest, "CD", 7 + unconst), 8);
+ KUNIT_EXPECT_STREQ(test, dest, "fourAB");
+ /* 1 of 2 characters skipped, now at true max size. */
+ KUNIT_EXPECT_EQ(test, strlcat(dest, "EFG", len), 9);
+ KUNIT_EXPECT_STREQ(test, dest, "fourABE");
+ /* Everything else ignored, now at full size. */
+ KUNIT_EXPECT_EQ(test, strlcat(dest, "1234", len), 11);
+ KUNIT_EXPECT_STREQ(test, dest, "fourABE");
+}
+
+static void string_test_strtomem(struct kunit *test)
+{
+ static const char input[sizeof(unsigned long)] = "hi";
+ static const char truncate[] = "this is too long";
+ struct {
+ unsigned long canary1;
+ unsigned char output[sizeof(unsigned long)] __nonstring;
+ unsigned long canary2;
+ } wrap;
+
+ memset(&wrap, 0xFF, sizeof(wrap));
+ KUNIT_EXPECT_EQ_MSG(test, wrap.canary1, ULONG_MAX,
+ "bad initial canary value");
+ KUNIT_EXPECT_EQ_MSG(test, wrap.canary2, ULONG_MAX,
+ "bad initial canary value");
+
+ /* Check unpadded copy leaves surroundings untouched. */
+ strtomem(wrap.output, input);
+ KUNIT_EXPECT_EQ(test, wrap.canary1, ULONG_MAX);
+ KUNIT_EXPECT_EQ(test, wrap.output[0], input[0]);
+ KUNIT_EXPECT_EQ(test, wrap.output[1], input[1]);
+ for (size_t i = 2; i < sizeof(wrap.output); i++)
+ KUNIT_EXPECT_EQ(test, wrap.output[i], 0xFF);
+ KUNIT_EXPECT_EQ(test, wrap.canary2, ULONG_MAX);
+
+ /* Check truncated copy leaves surroundings untouched. */
+ memset(&wrap, 0xFF, sizeof(wrap));
+ strtomem(wrap.output, truncate);
+ KUNIT_EXPECT_EQ(test, wrap.canary1, ULONG_MAX);
+ for (size_t i = 0; i < sizeof(wrap.output); i++)
+ KUNIT_EXPECT_EQ(test, wrap.output[i], truncate[i]);
+ KUNIT_EXPECT_EQ(test, wrap.canary2, ULONG_MAX);
+
+ /* Check padded copy leaves only string padded. */
+ memset(&wrap, 0xFF, sizeof(wrap));
+ strtomem_pad(wrap.output, input, 0xAA);
+ KUNIT_EXPECT_EQ(test, wrap.canary1, ULONG_MAX);
+ KUNIT_EXPECT_EQ(test, wrap.output[0], input[0]);
+ KUNIT_EXPECT_EQ(test, wrap.output[1], input[1]);
+ for (size_t i = 2; i < sizeof(wrap.output); i++)
+ KUNIT_EXPECT_EQ(test, wrap.output[i], 0xAA);
+ KUNIT_EXPECT_EQ(test, wrap.canary2, ULONG_MAX);
+
+ /* Check truncated padded copy has no padding. */
+ memset(&wrap, 0xFF, sizeof(wrap));
+ strtomem(wrap.output, truncate);
+ KUNIT_EXPECT_EQ(test, wrap.canary1, ULONG_MAX);
+ for (size_t i = 0; i < sizeof(wrap.output); i++)
+ KUNIT_EXPECT_EQ(test, wrap.output[i], truncate[i]);
+ KUNIT_EXPECT_EQ(test, wrap.canary2, ULONG_MAX);
+}
+
+
+static void string_test_memtostr(struct kunit *test)
+{
++ char nonstring[7] __nonstring = { 'a', 'b', 'c', 'd', 'e', 'f', 'g' };
++ char nonstring_small[3] __nonstring = { 'a', 'b', 'c' };
+ char dest[sizeof(nonstring) + 1];
+
+ /* Copy in a non-NUL-terminated string into exactly right-sized dest. */
+ KUNIT_EXPECT_EQ(test, sizeof(dest), sizeof(nonstring) + 1);
+ memset(dest, 'X', sizeof(dest));
+ memtostr(dest, nonstring);
+ KUNIT_EXPECT_STREQ(test, dest, "abcdefg");
+ memset(dest, 'X', sizeof(dest));
+ memtostr(dest, nonstring_small);
+ KUNIT_EXPECT_STREQ(test, dest, "abc");
+ KUNIT_EXPECT_EQ(test, dest[7], 'X');
+
+ memset(dest, 'X', sizeof(dest));
+ memtostr_pad(dest, nonstring);
+ KUNIT_EXPECT_STREQ(test, dest, "abcdefg");
+ memset(dest, 'X', sizeof(dest));
+ memtostr_pad(dest, nonstring_small);
+ KUNIT_EXPECT_STREQ(test, dest, "abc");
+ KUNIT_EXPECT_EQ(test, dest[7], '\0');
+}
+
+static struct kunit_case string_test_cases[] = {
+ KUNIT_CASE(string_test_memset16),
+ KUNIT_CASE(string_test_memset32),
+ KUNIT_CASE(string_test_memset64),
+ KUNIT_CASE(string_test_strchr),
+ KUNIT_CASE(string_test_strnchr),
+ KUNIT_CASE(string_test_strspn),
+ KUNIT_CASE(string_test_strcmp),
+ KUNIT_CASE(string_test_strcmp_long_strings),
+ KUNIT_CASE(string_test_strncmp),
+ KUNIT_CASE(string_test_strncmp_long_strings),
+ KUNIT_CASE(string_test_strcasecmp),
+ KUNIT_CASE(string_test_strcasecmp_long_strings),
+ KUNIT_CASE(string_test_strncasecmp),
+ KUNIT_CASE(string_test_strncasecmp_long_strings),
+ KUNIT_CASE(string_test_strscpy),
+ KUNIT_CASE(string_test_strcat),
+ KUNIT_CASE(string_test_strncat),
+ KUNIT_CASE(string_test_strlcat),
+ KUNIT_CASE(string_test_strtomem),
+ KUNIT_CASE(string_test_memtostr),
+ {}
+};
+
+static struct kunit_suite string_test_suite = {
+ .name = "string",
+ .test_cases = string_test_cases,
+};
+
+kunit_test_suites(&string_test_suite);
+
+MODULE_DESCRIPTION("Test cases for string functions");
+MODULE_LICENSE("GPL v2");
projects / linux-block.git / commitdiff