--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2009-03-07  Bruno Haible  <bruno@clisp.org>
+
+	New module 'memcmp2'.
+	* lib/memcmp2.h: New file.
+	* lib/memcmp2.c: New file.
+	* modules/memcmp2: New file.
+
 2009-03-07  Bruno Haible  <bruno@clisp.org>
 
 	Tests for module 'uninorm/decomposing-form'.

new file mode 100644
--- /dev/null
+++ b/lib/memcmp2.c
@@ -0,0 +1,36 @@
+/* Compare two memory areas with possibly different lengths.
+   Copyright (C) 2009 Free Software Foundation, Inc.
+
+   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 "memcmp2.h"
+
+#include <string.h>
+
+int
+memcmp2 (const char *s1, size_t n1, const char *s2, size_t n2)
+{
+  int cmp = memcmp (s1, s2, n1 <= n2 ? n1 : n2);
+  if (cmp == 0)
+    {
+      if (n1 < n2)
+	cmp = -1;
+      else if (n1 > n2)
+	cmp = 1;
+    }
+  return cmp;
+}

new file mode 100644
--- /dev/null
+++ b/lib/memcmp2.h
@@ -0,0 +1,39 @@
+/* Compare two memory areas with possibly different lengths.
+   Copyright (C) 2009 Free Software Foundation, Inc.
+
+   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/>.  */
+
+#ifndef MEMCMP2_H
+#define MEMCMP2_H
+
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/* Compare the memory regions S1 = [s1..s1+N1-1], S2 = [s2..s2+n2-1],
+   alphabetically.
+   This function's result is locale independent, unlike memcoll()'s.
+   Return a negative number if S1 < S2, a positive number if S1 > S2, or
+   0 if S1 and S2 have the same contents.  */
+extern int memcmp2 (const char *s1, size_t n1, const char *s2, size_t n2);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* MEMCMP2_H */

new file mode 100644
--- /dev/null
+++ b/modules/memcmp2
@@ -0,0 +1,22 @@
+Description:
+Compare two memory areas with possibly different lengths.
+
+Files:
+lib/memcmp2.h
+lib/memcmp2.c
+
+Depends-on:
+
+configure.ac:
+
+Makefile.am:
+lib_SOURCES += memcmp2.c
+
+Include:
+"memcmp2.h"
+
+License:
+LGPL
+
+Maintainer:
+Bruno Haible