1 files changed, 115 insertions, 0 deletions

diff --git a/lib/test_string.c b/lib/test_string.c
index b5117ae59693..c5cb92fb710e 100644
--- a/lib/test_string.c
+++ b/lib/test_string.c
@@ -112,6 +112,105 @@ fail:
 	return 0;
 }
 
+static __init int strchr_selftest(void)
+{
+	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]);
+		if (result - test_string != i)
+			return i + 'a';
+	}
+
+	result = strchr(empty_string, '\0');
+	if (result != empty_string)
+		return 0x101;
+
+	result = strchr(empty_string, 'a');
+	if (result)
+		return 0x102;
+
+	result = strchr(test_string, 'z');
+	if (result)
+		return 0x103;
+
+	return 0;
+}
+
+static __init int strnchr_selftest(void)
+{
+	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) {
+				if (!result)
+					continue;
+				return ((i + 'a') << 8) | j;
+			}
+			if (result - test_string != i)
+				return ((i + 'a') << 8) | j;
+		}
+	}
+
+	result = strnchr(empty_string, 0, '\0');
+	if (result)
+		return 0x10001;
+
+	result = strnchr(empty_string, 1, '\0');
+	if (result != empty_string)
+		return 0x10002;
+
+	result = strnchr(empty_string, 1, 'a');
+	if (result)
+		return 0x10003;
+
+	result = strnchr(NULL, 0, '\0');
+	if (result)
+		return 0x10004;
+
+	return 0;
+}
+
+static __init int strspn_selftest(void)
+{
+	static const struct strspn_test {
+		const char str[16];
+		const char accept[16];
+		const char reject[16];
+		unsigned a;
+		unsigned r;
+	} tests[] __initconst = {
+		{ "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, res;
+
+	for (i = 0; i < ARRAY_SIZE(tests); ++i, ++s) {
+		res = strspn(s->str, s->accept);
+		if (res != s->a)
+			return 0x100 + 2*i;
+		res = strcspn(s->str, s->reject);
+		if (res != s->r)
+			return 0x100 + 2*i + 1;
+	}
+	return 0;
+}
+
+static __exit void string_selftest_remove(void)
+{
+}
+
 static __init int string_selftest_init(void)
 {
 	int test, subtest;
@@ -131,6 +230,21 @@ static __init int string_selftest_init(void)
 	if (subtest)
 		goto fail;
 
+	test = 4;
+	subtest = strchr_selftest();
+	if (subtest)
+		goto fail;
+
+	test = 5;
+	subtest = strnchr_selftest();
+	if (subtest)
+		goto fail;
+
+	test = 6;
+	subtest = strspn_selftest();
+	if (subtest)
+		goto fail;
+
 	pr_info("String selftests succeeded\n");
 	return 0;
 fail:
@@ -139,4 +253,5 @@ fail:
 }
 
 module_init(string_selftest_init);
+module_exit(string_selftest_remove);
 MODULE_LICENSE("GPL v2");