1 files changed, 109 insertions, 0 deletions
diff --git a/tests/test-hard-locale.c b/tests/test-hard-locale.c
new file mode 100644
index 00000000..813a6437
--- /dev/null
+++ b/tests/test-hard-locale.c
@@ -0,0 +1,109 @@
+/* Test of determination whether a locale is different from the "C" locale.
+   Copyright (C) 2019-2022 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>, 2019.  */
+
+#include <config.h>
+
+#include "hard-locale.h"
+
+#include <locale.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <string.h>
+
+/* True if all locale names are accepted and all locales are trivial.
+   This is the case e.g. on OpenBSD 3.8.  */
+static bool all_trivial;
+
+static int
+test_one (const char *name, int failure_bitmask)
+{
+  if (setlocale (LC_ALL, name) != NULL)
+    {
+      bool expected;
+
+      /* musl libc has special code for the C.UTF-8 locale; other than that,
+         all locale names are accepted and all locales are trivial.
+         OpenBSD returns the locale name that was set, but we don't know how it
+         behaves under the hood.  Likewise for Haiku.  */
+#if defined MUSL_LIBC || defined __OpenBSD__ || defined __HAIKU__
+      expected = true;
+#else
+      expected = !all_trivial;
+#endif
+      if (hard_locale (LC_CTYPE) != expected)
+        {
+          if (expected)
+            fprintf (stderr, "Unexpected: The category LC_CTYPE of the locale '%s' is not equivalent to C or POSIX.\n",
+                     name);
+          else
+            fprintf (stderr, "Unexpected: The category LC_CTYPE of the locale '%s' is equivalent to C or POSIX.\n",
+                     name);
+          return failure_bitmask;
+        }
+
+      /* On NetBSD 7.0, some locales such as de_DE.ISO8859-1 and de_DE.UTF-8
+         have the LC_COLLATE category set to "C".
+         Similarly, on musl libc, with the C.UTF-8 locale.  */
+#if defined __NetBSD__
+      expected = false;
+#elif defined MUSL_LIBC
+      expected = strcmp (name, "C.UTF-8") != 0;
+#elif (defined __OpenBSD__ && HAVE_DUPLOCALE) || defined __HAIKU__ /* OpenBSD >= 6.2, Haiku */
+      expected = true;
+#else
+      expected = !all_trivial;
+#endif
+      if (hard_locale (LC_COLLATE) != expected)
+        {
+          if (expected)
+            fprintf (stderr, "Unexpected: The category LC_COLLATE of the locale '%s' is not equivalent to C or POSIX.\n",
+                     name);
+          else
+            fprintf (stderr, "Unexpected: The category LC_COLLATE of the locale '%s' is equivalent to C or POSIX.\n",
+                     name);
+          return failure_bitmask;
+        }
+    }
+  return 0;
+}
+
+int
+main ()
+{
+  int fail = 0;
+
+  /* The initial locale is the "C" or "POSIX" locale.  */
+  if (hard_locale (LC_CTYPE) || hard_locale (LC_COLLATE))
+    {
+      fprintf (stderr, "The initial locale should not be hard!\n");
+      fail |= 1;
+    }
+
+  all_trivial = (setlocale (LC_ALL, "foobar") != NULL);
+
+  fail |= test_one ("de", 2);
+  fail |= test_one ("de_DE", 4);
+  fail |= test_one ("de_DE.ISO8859-1", 8);
+  fail |= test_one ("de_DE.iso88591", 8);
+  fail |= test_one ("de_DE.UTF-8", 16);
+  fail |= test_one ("de_DE.utf8", 16);
+  fail |= test_one ("german", 32);
+  fail |= test_one ("C.UTF-8", 64);
+
+  return fail;
+}