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author | Peter Rosin <peda@axentia.se> | 2019-07-17 01:27:21 +0200 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-07-17 04:23:22 +0200 |
commit | d1a5dc5e6accbeaabe59e3d55b47f15a8b19c2bd (patch) | |
tree | b1aa30390186d63f5f8c1cbc24045598033b1314 /lib/test_string.c | |
parent | lib/test_string.c: avoid masking memset16/32/64 failures (diff) | |
download | linux-d1a5dc5e6accbeaabe59e3d55b47f15a8b19c2bd.tar.xz linux-d1a5dc5e6accbeaabe59e3d55b47f15a8b19c2bd.zip |
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.c | 77 |
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: |