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diff --git a/lib/unistr/u-strdup.h b/lib/unistr/u-strdup.h
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+/* Copy UTF-8/UTF-16/UTF-32 string.
+ Copyright (C) 1999, 2002, 2006-2007 Free Software Foundation, Inc.
+ Written by Bruno Haible <bruno@clisp.org>, 2002.
+
+ 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 <stdlib.h>
+#include <string.h>
+
+UNIT *
+FUNC (const UNIT *s)
+{
+ size_t n = U_STRLEN (s) + 1;
+ UNIT *dest;
+
+ dest = (UNIT *) malloc (n * sizeof (UNIT));
+ if (dest != NULL)
+ {
+#if 0
+ UNIT *destptr = dest;
+
+ for (; n > 0; n--)
+ *destptr++ = *s++;
+#else
+ memcpy ((char *) dest, (const char *) s, n * sizeof (UNIT));
+#endif
+ }
+ return dest;
+}