From: Wilco Dijkstra <wilco.dijkstra@arm.com>
Date: Thu, 18 Jun 2026 17:02:59 +0000 (+0000)
Subject: string: Improve memchr random test
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;p=thirdparty%2Fglibc.git

string: Improve memchr random test

Add matches before the start to ensure the memchr test checks they do not
result in false matches or missed matches.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
---

diff --git a/string/test-memchr.c b/string/test-memchr.c
index df9ce0f22c..42d18a596f 100644
--- a/string/test-memchr.c
+++ b/string/test-memchr.c
@@ -177,6 +177,11 @@ do_random_tests (void)
 	    }
 	}
 
+      /* Add matching chars before the start to improve test coverage.  */
+      i = random () & 31;
+      if (i < align)
+	p[i] = seek_char;
+
       if (pos < len)
 	{
 	  size_t r = random ();