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

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.

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

diff --git a/string/test-strncmp.c b/string/test-strncmp.c
index df7cea40683b0731b2b6b1776cc4717131f96c04..1a87f0e73e362160286d3b558aa70c9f7d057289 100644 (file)
--- 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)