>From f9da9cbb88036d5dae18df9394c1e2fe6a6bc3a8 Mon Sep 17 00:00:00 2001
From: Bruno Haible <bruno@clisp.org>
Date: Tue, 5 Nov 2024 21:10:23 +0100
Subject: [PATCH 08/23] strndup tests: Verify N3322 functionality.

* tests/test-strndup.c: New file.
* modules/strndup-tests: New file.
---
 ChangeLog             |  4 ++++
 modules/strndup-tests | 11 +++++++++++
 tests/test-strndup.c  | 38 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 53 insertions(+)
 create mode 100644 modules/strndup-tests
 create mode 100644 tests/test-strndup.c

diff --git a/ChangeLog b/ChangeLog
index 06ccb74f9a..b61465d749 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2024-11-05  Bruno Haible  <bruno@clisp.org>
 
+	strndup tests: Verify N3322 functionality.
+	* tests/test-strndup.c: New file.
+	* modules/strndup-tests: New file.
+
 	strndup: Guarantee N3322 functionality.
 	* m4/strndup.m4 (gl_FUNC_STRNDUP): Check against the AIX bug.
 	* doc/posix-functions/strndup.texi: Mention the AIX bug.
diff --git a/modules/strndup-tests b/modules/strndup-tests
new file mode 100644
index 0000000000..9b354d5b04
--- /dev/null
+++ b/modules/strndup-tests
@@ -0,0 +1,11 @@
+Files:
+tests/test-strndup.c
+tests/macros.h
+
+Depends-on:
+
+configure.ac:
+
+Makefile.am:
+TESTS += test-strndup
+check_PROGRAMS += test-strndup
diff --git a/tests/test-strndup.c b/tests/test-strndup.c
new file mode 100644
index 0000000000..a9a1625826
--- /dev/null
+++ b/tests/test-strndup.c
@@ -0,0 +1,38 @@
+/* Test of strndup() function.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include <string.h>
+
+#include <stddef.h>
+
+#include "macros.h"
+
+int
+main (void)
+{
+  int volatile value;
+
+  /* Test zero-length operations on NULL pointers, allowed by
+     <https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3322.pdf>.  */
+
+  value = (strndup (NULL, 0) != NULL);
+  ASSERT (value);
+
+  return test_exit_status;
+}
-- 
2.34.1