2024-11-05 Bruno Haible <bruno@clisp.org>
+ wcsncat tests: Verify N3322 functionality.
+ * tests/test-wcsncat.c: New file.
+ * modules/wcsncat-tests: New file.
+
wcsncat: Guarantee N3322 functionality.
* lib/wchar.in.h (wcsncat): Consider REPLACE_WCSNCAT.
* m4/wcsncat.m4 (gl_FUNC_WCSNCAT): Test whether the zero-length bug is
--- /dev/null
+/* Test of wcsncat() function.
+ Copyright (C) 2010-2024 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/>. */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2024. */
+
+#include <config.h>
+
+/* Specification. */
+#include <wchar.h>
+
+#include <stddef.h>
+
+#include "macros.h"
+
+int
+main ()
+{
+ int volatile value;
+
+ /* Test zero-length operations on NULL pointers, allowed by
+ <https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3322.pdf>. */
+
+#if 0 /* I think this is invalid, per ISO C 23 ยง 7.31.4.3.2. */
+ value = (wcsncat (NULL, L"x", 0) == NULL);
+ ASSERT (value);
+#endif
+
+ {
+ wchar_t y[1];
+ value = (wcsncat (y, NULL, 0) == y);
+ ASSERT (value);
+ }
+
+ return test_exit_status;
+}