On Thu, Aug 28, 2025 at 4:08 AM Rong Tao <rtoax@xxxxxxxxxxx> wrote:
>
> From: Rong Tao <rongtao@xxxxxxxx>
>
> Add two tests for bpf_strnstr():
>
> bpf_strnstr("", "", 0) = 0
> bpf_strnstr("hello world", "hello", 5) = 0
>
> Signed-off-by: Rong Tao <rongtao@xxxxxxxx>
> ---
> tools/testing/selftests/bpf/progs/string_kfuncs_success.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/tools/testing/selftests/bpf/progs/string_kfuncs_success.c b/tools/testing/selftests/bpf/progs/string_kfuncs_success.c
> index 46697f381878..1b56bd5860e9 100644
> --- a/tools/testing/selftests/bpf/progs/string_kfuncs_success.c
> +++ b/tools/testing/selftests/bpf/progs/string_kfuncs_success.c
> @@ -30,7 +30,9 @@ __test(2) int test_strcspn(void *ctx) { return bpf_strcspn(str, "lo"); }
> __test(6) int test_strstr_found(void *ctx) { return bpf_strstr(str, "world"); }
> __test(-ENOENT) int test_strstr_notfound(void *ctx) { return bpf_strstr(str, "hi"); }
> __test(0) int test_strstr_empty(void *ctx) { return bpf_strstr(str, ""); }
> -__test(0) int test_strnstr_found(void *ctx) { return bpf_strnstr(str, "hello", 6); }
> +__test(0) int test_strnstr_found1(void *ctx) { return bpf_strnstr("", "", 0); }
> +__test(0) int test_strnstr_found2(void *ctx) { return bpf_strnstr(str, "hello", 5); }
add (str, "hello", 4) == -ENOENT case?
Also let's add negative ("", "a", 0) == -ENOENT case?
pw-bot: cr
> +__test(0) int test_strnstr_found3(void *ctx) { return bpf_strnstr(str, "hello", 6); }
> __test(-ENOENT) int test_strnstr_notfound(void *ctx) { return bpf_strnstr(str, "hi", 10); }
> __test(0) int test_strnstr_empty(void *ctx) { return bpf_strnstr(str, "", 1); }
>
> --
> 2.51.0
>
