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diff --git a/lib/unistr/u-strncat.h b/lib/unistr/u-strncat.h
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+/* Concatenate UTF-8/UTF-16/UTF-32 strings.
+ Copyright (C) 1999, 2002, 2006 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/>. */
+
+UNIT *
+FUNC (UNIT *dest, const UNIT *src, size_t n)
+{
+ UNIT *destptr = dest + U_STRLEN (dest);
+
+ for (; n > 0 && (*destptr = *src) != 0; src++, destptr++, n--)
+ ;
+ if (n == 0)
+ *destptr = 0;
+ return dest;
+}