1 files changed, 58 insertions, 0 deletions
diff --git a/lib/localename-environ.c b/lib/localename-environ.c
new file mode 100644
index 00000000..0d35d6bb
--- /dev/null
+++ b/lib/localename-environ.c
@@ -0,0 +1,58 @@
+/* Determine name of the currently selected locale.
+   Copyright (C) 1995-2025 Free Software Foundation, Inc.
+
+   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/>.  */
+
+/* Written by Ulrich Drepper <drepper@gnu.org>, 1995.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include "localename.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+const char *
+gl_locale_name_environ (_GL_UNUSED int category, const char *categoryname)
+{
+  const char *retval;
+
+  /* Setting of LC_ALL overrides all other.  */
+  retval = getenv ("LC_ALL");
+  if (retval != NULL && retval[0] != '\0')
+    return retval;
+  /* Next comes the name of the desired category.  */
+  retval = getenv (categoryname);
+  if (retval != NULL && retval[0] != '\0')
+    return retval;
+  /* Last possibility is the LANG environment variable.  */
+  retval = getenv ("LANG");
+  if (retval != NULL && retval[0] != '\0')
+    {
+#if HAVE_CFPREFERENCESCOPYAPPVALUE
+      /* Mac OS X 10.2 or newer.
+         Ignore invalid LANG value set by the Terminal application.  */
+      if (!streq (retval, "UTF-8"))
+#endif
+#if defined __CYGWIN__
+      /* Cygwin.
+         Ignore dummy LANG value set by ~/.profile.  */
+       if (!streq (retval, "C.UTF-8"))
+#endif
+        return retval;
+    }
+
+  return NULL;
+}