[PATCH] string: Add a testcase for wcsncmp with SIZE_MAX [BZ #28755]

[Sunil Pandey]

LGTM

Reviewed-by: Sunil K Pandey <skpgkp2@gmail.com>

On Thu, Feb 17, 2022 at 8:28 AM H.J. Lu via Libc-alpha
<libc-alpha@sourceware.org> wrote:
>
> Verify that wcsncmp (L"abc", L"abd", SIZE_MAX) == 0.  The new test fails
> without
>
> commit ddf0992cf57a93200e0c782e2a94d0733a5a0b87
> Author: Noah Goldstein <goldstein.w.n@gmail.com>
> Date:   Sun Jan 9 16:02:21 2022 -0600
>
>     x86: Fix __wcsncmp_avx2 in strcmp-avx2.S [BZ# 28755]
>
> and
>
> commit 7e08db3359c86c94918feb33a1182cd0ff3bb10b
> Author: Noah Goldstein <goldstein.w.n@gmail.com>
> Date:   Sun Jan 9 16:02:28 2022 -0600
>
>     x86: Fix __wcsncmp_evex in strcmp-evex.S [BZ# 28755]
>
> This is for BZ #28755.
> ---
>  string/test-strncmp.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
>
> diff --git a/string/test-strncmp.c b/string/test-strncmp.c
> index df7cea4068..1a87f0e73e 100644
> --- a/string/test-strncmp.c
> +++ b/string/test-strncmp.c
> @@ -445,6 +445,18 @@ check4 (void)
>    check_result (impl, s1, s2, size, exp_result);
>  }
>
> +static void
> +check5 (void)
> +{
> +  const CHAR *s1 = L ("abc");
> +  CHAR *s2 = STRDUP (s1);
> +
> +  FOR_EACH_IMPL (impl, 0)
> +    check_result (impl, s1, s2, SIZE_MAX, 0);
> +
> +  free (s2);
> +}
> +
>  static void
>  check_overflow (void)
>  {
> @@ -569,6 +581,7 @@ test_main (void)
>    check2 ();
>    check3 ();
>    check4 ();
> +  check5 ();
>
>    printf ("%23s", "");
>    FOR_EACH_IMPL (impl, 0)
> --
> 2.35.1
>