[PATCH] Check that strnlen won't go beyond the maximum length

["H.J. Lu" <hjl.tools@gmail.com>]

Run strnlen tests on strings without the null byte around the page
boundary.
---
 string/test-strnlen.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/string/test-strnlen.c b/string/test-strnlen.c
index 61eb521dc1..a49d93afa2 100644
--- a/string/test-strnlen.c
+++ b/string/test-strnlen.c
@@ -196,6 +196,31 @@ do_page_tests (void)
     }
 }
 
+/* Tests meant to unveil fail on implementation that does not access bytes
+   without the null character around the page boundary accordingly.  */
+static void
+do_page_2_tests (void)
+{
+  size_t i, exp_len, offset;
+  size_t last_offset = page_size / sizeof (CHAR);
+
+  CHAR *s = (CHAR *) buf2;
+  memset (s, 65, page_size);
+
+  /* Place short strings ending at page boundary.  */
+  offset = last_offset;
+  for (i = 0; i < 128; i++)
+    {
+      /* Decrease offset to stress several sizes and alignments.  */
+      offset--;
+      exp_len = last_offset - offset;
+      FOR_EACH_IMPL (impl, 0)
+        {
+          do_one_test (impl, (CHAR *) (s + offset), exp_len, exp_len);
+        }
+    }
+}
+
 int
 test_main (void)
 {
@@ -242,6 +267,7 @@ test_main (void)
 
   do_random_tests ();
   do_page_tests ();
+  do_page_2_tests ();
   return ret;
 }
 
-- 
2.30.2