+/* Determine whether a locale is hard.
+ *
+ * Copyright (C) 1997-1999, 2002-2004, 2006-2007, 2009-2022 Free Software
+ * Foundation, Inc.
+ *
+ * Imported from Gnulib hard-locale.[ch] with modifications by Nick Bowler:
+ *
+ * - Remove all setlocale workarounds, as our use case does not do anything
+ * fancy with locales and does not require thread safety (2024-01).
+ *
+ * This file is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of the
+ * License, or (at your option) any later version.
+ *
+ * This file 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef HARD_LOCALE_H_
+#define HARD_LOCALE_H_
+
+#include <string.h>
+#include <locale.h>
+
+static inline int hard_locale(int locale)
+{
+ char *name;
+
+ if (!(name = setlocale(locale, NULL)))
+ return 0;
+
+ return strcmp(name, "C") && strcmp(name, "POSIX");
+}
+
+#endif