--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,18 @@
+2011-02-05  Bruno Haible  <bruno@clisp.org>
+
+	New module 'wmemmove'.
+	* modules/wmemmove: New file.
+	* lib/wchar.in.h (wmemmove): New declaration.
+	* lib/wmemmove.c: New file.
+	* lib/wmemmove-impl.h: New file, from libutf8 with modifications.
+	* m4/wmemmove.m4: New file.
+	* m4/wchar_h.m4 (gl_WCHAR_H): Test whether wmemmove is declared.
+	(gl_WCHAR_H_DEFAULTS): Initialize GNULIB_WMEMMOVE, HAVE_WMEMMOVE.
+	* modules/wchar (Makefile.am): Substitute GNULIB_WMEMMOVE,
+	HAVE_WMEMMOVE.
+	* tests/test-wchar-c++.cc: Test the declaration of wmemmove.
+	* doc/posix-functions/wmemmove.texi: Mention the new module.
+
 2011-02-05  Bruno Haible  <bruno@clisp.org>
 
 	New module 'wmemcpy'.

--- a/doc/posix-functions/wmemmove.texi
+++ b/doc/posix-functions/wmemmove.texi
@@ -4,18 +4,18 @@
 
 POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/wmemmove.html}
 
-Gnulib module: ---
+Gnulib module: wmemmove
 
 Portability problems fixed by Gnulib:
 @itemize
+@item
+This function is missing on some platforms:
+HP-UX 11.00, IRIX 6.5, Solaris 2.6, Interix 3.5.
 @end itemize
 
 Portability problems not fixed by Gnulib:
 @itemize
 @item
-This function is missing on some platforms:
-HP-UX 11.00, IRIX 6.5, Solaris 2.6, Interix 3.5.
-@item
 On AIX and Windows platforms, @code{wchar_t} is a 16-bit type and therefore cannot
 accommodate all Unicode characters.
 @end itemize

--- a/lib/wchar.in.h
+++ b/lib/wchar.in.h
@@ -482,6 +482,25 @@
 #endif
 
 
+/* Copy N wide characters of SRC to DEST, guaranteeing correct behavior for
+   overlapping memory areas.  */
+#if @GNULIB_WMEMMOVE@
+# if !@HAVE_WMEMMOVE@
+_GL_FUNCDECL_SYS (wmemmove, wchar_t *,
+                  (wchar_t *dest, const wchar_t *src, size_t n));
+# endif
+_GL_CXXALIAS_SYS (wmemmove, wchar_t *,
+                  (wchar_t *dest, const wchar_t *src, size_t n));
+_GL_CXXALIASWARN (wmemmove);
+#elif defined GNULIB_POSIXCHECK
+# undef wmemmove
+# if HAVE_RAW_DECL_WMEMMOVE
+_GL_WARN_ON_USE (wmemmove, "wmemmove is unportable - "
+                 "use gnulib module wmemmove for portability");
+# endif
+#endif
+
+
 #endif /* _GL_WCHAR_H */
 #endif /* _GL_WCHAR_H */
 #endif

new file mode 100644
--- /dev/null
+++ b/lib/wmemmove-impl.h
@@ -0,0 +1,36 @@
+/* Copy wide character array.
+   Copyright (C) 1999, 2011 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 1999.
+
+   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 <http://www.gnu.org/licenses/>.  */
+
+wchar_t *
+wmemmove (wchar_t *dest, const wchar_t *src, size_t n)
+{
+  if (dest < src)
+    {
+      wchar_t *destptr = dest;
+      const wchar_t *srcptr = src;
+      for (; n > 0; n--)
+        *destptr++ = *srcptr++;
+    }
+  else if (dest > src)
+    {
+      wchar_t *destptr = dest + n - 1;
+      const wchar_t *srcptr = src + n - 1;
+      for (; n > 0; n--)
+        *destptr-- = *srcptr--;
+    }
+  return dest;
+}

new file mode 100644
--- /dev/null
+++ b/lib/wmemmove.c
@@ -0,0 +1,23 @@
+/* Copy wide character array.
+   Copyright (C) 2011 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 2011.
+
+   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 <http://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include <wchar.h>
+
+#include "wmemmove-impl.h"

--- a/m4/wchar_h.m4
+++ b/m4/wchar_h.m4
@@ -50,7 +50,7 @@
 #include <wchar.h>
     ]],
     [btowc wctob mbsinit mbrtowc mbrlen mbsrtowcs mbsnrtowcs wcrtomb
-     wcsrtombs wcsnrtombs wcwidth wmemchr wmemcmp wmemcpy
+     wcsrtombs wcsnrtombs wcwidth wmemchr wmemcmp wmemcpy wmemmove
     ])
 ])
 
@@ -148,6 +148,7 @@
   GNULIB_WMEMCHR=0;    AC_SUBST([GNULIB_WMEMCHR])
   GNULIB_WMEMCMP=0;    AC_SUBST([GNULIB_WMEMCMP])
   GNULIB_WMEMCPY=0;    AC_SUBST([GNULIB_WMEMCPY])
+  GNULIB_WMEMMOVE=0;   AC_SUBST([GNULIB_WMEMMOVE])
   dnl Assume proper GNU behavior unless another module says otherwise.
   HAVE_BTOWC=1;         AC_SUBST([HAVE_BTOWC])
   HAVE_MBSINIT=1;       AC_SUBST([HAVE_MBSINIT])
@@ -161,6 +162,7 @@
   HAVE_WMEMCHR=1;       AC_SUBST([HAVE_WMEMCHR])
   HAVE_WMEMCMP=1;       AC_SUBST([HAVE_WMEMCMP])
   HAVE_WMEMCPY=1;       AC_SUBST([HAVE_WMEMCPY])
+  HAVE_WMEMMOVE=1;      AC_SUBST([HAVE_WMEMMOVE])
   HAVE_DECL_WCTOB=1;    AC_SUBST([HAVE_DECL_WCTOB])
   HAVE_DECL_WCWIDTH=1;  AC_SUBST([HAVE_DECL_WCWIDTH])
   REPLACE_MBSTATE_T=0;  AC_SUBST([REPLACE_MBSTATE_T])

new file mode 100644
--- /dev/null
+++ b/m4/wmemmove.m4
@@ -0,0 +1,15 @@
+# wmemmove.m4 serial 1
+dnl Copyright (C) 2011 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_FUNC_WMEMMOVE],
+[
+  AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
+  AC_CHECK_FUNCS_ONCE([wmemmove])
+  if test $ac_cv_func_wmemmove = no; then
+    HAVE_WMEMMOVE=0
+    AC_LIBOBJ([wmemmove])
+  fi
+])

--- a/modules/wchar
+++ b/modules/wchar
@@ -44,6 +44,7 @@
 	      -e 's|@''GNULIB_WMEMCHR''@|$(GNULIB_WMEMCHR)|g' \
 	      -e 's|@''GNULIB_WMEMCMP''@|$(GNULIB_WMEMCMP)|g' \
 	      -e 's|@''GNULIB_WMEMCPY''@|$(GNULIB_WMEMCPY)|g' \
+	      -e 's|@''GNULIB_WMEMMOVE''@|$(GNULIB_WMEMMOVE)|g' \
 	      -e 's|@''HAVE_WINT_T''@|$(HAVE_WINT_T)|g' \
 	      -e 's|@''HAVE_BTOWC''@|$(HAVE_BTOWC)|g' \
 	      -e 's|@''HAVE_MBSINIT''@|$(HAVE_MBSINIT)|g' \
@@ -57,6 +58,7 @@
 	      -e 's|@''HAVE_WMEMCHR''@|$(HAVE_WMEMCHR)|g' \
 	      -e 's|@''HAVE_WMEMCMP''@|$(HAVE_WMEMCMP)|g' \
 	      -e 's|@''HAVE_WMEMCPY''@|$(HAVE_WMEMCPY)|g' \
+	      -e 's|@''HAVE_WMEMMOVE''@|$(HAVE_WMEMMOVE)|g' \
 	      -e 's|@''HAVE_DECL_WCTOB''@|$(HAVE_DECL_WCTOB)|g' \
 	      -e 's|@''HAVE_DECL_WCWIDTH''@|$(HAVE_DECL_WCWIDTH)|g' \
 	      -e 's|@''REPLACE_MBSTATE_T''@|$(REPLACE_MBSTATE_T)|g' \

new file mode 100644
--- /dev/null
+++ b/modules/wmemmove
@@ -0,0 +1,25 @@
+Description:
+wmemmove() function: copy wide character array.
+
+Files:
+lib/wmemmove.c
+lib/wmemmove-impl.h
+m4/wmemmove.m4
+
+Depends-on:
+wchar
+
+configure.ac:
+gl_FUNC_WMEMMOVE
+gl_WCHAR_MODULE_INDICATOR([wmemmove])
+
+Makefile.am:
+
+Include:
+<wchar.h>
+
+License:
+LGPL
+
+Maintainer:
+Bruno Haible

--- a/tests/test-wchar-c++.cc
+++ b/tests/test-wchar-c++.cc
@@ -90,6 +90,11 @@
                  (wchar_t *, const wchar_t *, size_t));
 #endif
 
+#if GNULIB_TEST_WMEMMOVE
+SIGNATURE_CHECK (GNULIB_NAMESPACE::wmemmove, wchar_t *,
+                 (wchar_t *, const wchar_t *, size_t));
+#endif
+
 
 int
 main ()