wmemcmp: Add tests.

* tests/test-wmemcmp.c: New file, based on tests/unistr/test-cmp.h.
* modules/wmemcmp-tests: New file.

1 files changed, 91 insertions, 0 deletions

diff --git a/tests/test-wmemcmp.c b/tests/test-wmemcmp.c
new file mode 100644
index 0000000000..998dff2653
--- /dev/null
+++ b/tests/test-wmemcmp.c
@@ -0,0 +1,91 @@
+/* Test of wmemcmp() function.
+   Copyright (C) 2008-2023 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>, 2023.  */
+
+#include <config.h>
+
+#include <wchar.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (wmemcmp, int, (const wchar_t *, const wchar_t *, size_t));
+
+#include "macros.h"
+
+int
+main (int argc, char *argv[])
+{
+  /* Test equal / not equal distinction.  */
+  {
+    static const wchar_t input1[] = { 'f', 'o', 'o', 0 };
+    static const wchar_t input2[] = { 'f', 'o', 'o', 'b', 'a', 'r', 0 };
+    ASSERT (wmemcmp (input1, input2, 2) == 0);
+    ASSERT (wmemcmp (input1, input2, 3) == 0);
+    ASSERT (wmemcmp (input1, input2, 4) != 0);
+  }
+  {
+    static const wchar_t input1[] = { 'f', 'o', 'o', 0 };
+    static const wchar_t input2[] = { 'b', 'a', 'r', 0 };
+    ASSERT (wmemcmp (input1, input2, 1) != 0);
+    ASSERT (wmemcmp (input1, input2, 3) != 0);
+  }
+
+  /* Test less / equal / greater distinction.  */
+  {
+    static const wchar_t input1[] = { 'f', 'o', 'o', 0 };
+    static const wchar_t input2[] = { 'm', 'o', 'o', 0 };
+    ASSERT (wmemcmp (input1, input2, 4) < 0);
+    ASSERT (wmemcmp (input2, input1, 4) > 0);
+  }
+  {
+    static const wchar_t input1[] = { 'o', 'o', 'm', 'p', 'h', 0 };
+    static const wchar_t input2[] = { 'o', 'o', 'p', 's', 0 };
+    ASSERT (wmemcmp (input1, input2, 3) < 0);
+    ASSERT (wmemcmp (input2, input1, 3) > 0);
+  }
+  {
+    static const wchar_t input1[] = { 'f', 'o', 'o', 0 };
+    static const wchar_t input2[] = { 'f', 'o', 'o', 'b', 'a', 'r', 0 };
+    ASSERT (wmemcmp (input1, input2, 4) < 0);
+    ASSERT (wmemcmp (input2, input1, 4) > 0);
+  }
+
+  /* ISO C requires wmemcmp to work with all wchar_t values.  */
+  {
+    static const wchar_t input1[] = { (wchar_t) 0x76547654 };
+    static const wchar_t input2[] = { (wchar_t) 0x9abc9abc };
+    if ((wchar_t)-1 < 0)
+      {
+        /* wchar_t is signed.  */
+        ASSERT (wmemcmp (input1, input2, 1) > 0);
+        ASSERT (wmemcmp (input2, input1, 1) < 0);
+      }
+    else
+      {
+        /* wchar_t is unsigned.  */
+        ASSERT (wmemcmp (input1, input2, 1) < 0);
+        ASSERT (wmemcmp (input2, input1, 1) > 0);
+      }
+  }
+  {
+    static const wchar_t input1[] = { (wchar_t) 0x9abc9abc };
+    static const wchar_t input2[] = { (wchar_t) 0x9bdf9bdf };
+    ASSERT (wmemcmp (input1, input2, 1) < 0);
+    ASSERT (wmemcmp (input2, input1, 1) > 0);
+  }
+
+  return 0;
+}