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authorPeter Rosin <peda@axentia.se>2019-07-16 16:27:21 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-07-16 19:23:22 -0700
commitd1a5dc5e6accbeaabe59e3d55b47f15a8b19c2bd (patch)
treeb1aa30390186d63f5f8c1cbc24045598033b1314 /lib/test_string.c
parent33d6e0ff68af74be0c846c8e042e84a9a1a0561e (diff)
lib/test_string.c: add some testcases for strchr and strnchr
Make sure that the trailing NUL is considered part of the string and can be found. Link: http://lkml.kernel.org/r/20190506124634.6807-4-peda@axentia.se Signed-off-by: Peter Rosin <peda@axentia.se> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/test_string.c')
-rw-r--r--lib/test_string.c77
1 files changed, 77 insertions, 0 deletions
diff --git a/lib/test_string.c b/lib/test_string.c
index b5117ae59693..7b31f4a505bf 100644
--- a/lib/test_string.c
+++ b/lib/test_string.c
@@ -112,6 +112,73 @@ 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 string_selftest_init(void)
{
int test, subtest;
@@ -131,6 +198,16 @@ 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;
+
pr_info("String selftests succeeded\n");
return 0;
fail: