--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2009-03-08  Bruno Haible  <bruno@clisp.org>
 
+	New module 'unicase/u8-is-casefolded'.
+	* lib/unicase/u8-is-casefolded.c: New file.
+	* modules/unicase/u8-is-casefolded: New file.
+
 	Tests for module 'unicase/u32-is-titlecase'.
 	* modules/unicase/u32-is-titlecase-tests: New file.
 	* tests/unicase/test-u32-is-titlecase.c: New file.

new file mode 100644
--- /dev/null
+++ b/lib/unicase/u8-is-casefolded.c
@@ -0,0 +1,30 @@
+/* Test whether an UTF-8 string is already case-folded.
+   Copyright (C) 2009 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 2009.
+
+   This program 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 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
+   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 <http://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include "unicase.h"
+
+#include "unicase/invariant.h"
+
+int
+u8_is_casefolded (const uint8_t *s, size_t n, const char *iso639_language,
+		  bool *resultp)
+{
+  return u8_is_invariant (s, n, u8_casefold, iso639_language, resultp);
+}

new file mode 100644
--- /dev/null
+++ b/modules/unicase/u8-is-casefolded
@@ -0,0 +1,25 @@
+Description:
+Test whether an UTF-8 string is already case-folded.
+
+Files:
+lib/unicase/u8-is-casefolded.c
+
+Depends-on:
+unicase/base
+unicase/u8-is-invariant
+unicase/u8-casefold
+
+configure.ac:
+
+Makefile.am:
+lib_SOURCES += unicase/u8-is-casefolded.c
+
+Include:
+"unicase.h"
+
+License:
+LGPL
+
+Maintainer:
+Bruno Haible
+