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-rw-r--r--lib/unistr/u-cpy.h33
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diff --git a/lib/unistr/u-cpy.h b/lib/unistr/u-cpy.h
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+++ b/lib/unistr/u-cpy.h
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+/* Copy piece of UTF-8/UTF-16/UTF-32 string.
+ Copyright (C) 1999, 2002, 2006, 2009-2022 Free Software Foundation, Inc.
+ Written by Bruno Haible <bruno@clisp.org>, 2002.
+
+ This file 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 2.1 of the
+ License, or (at your option) any later version.
+
+ This file 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 <https://www.gnu.org/licenses/>. */
+
+#include <string.h>
+
+UNIT *
+FUNC (UNIT *dest, const UNIT *src, size_t n)
+{
+#if 0
+ UNIT *destptr = dest;
+
+ for (; n > 0; n--)
+ *destptr++ = *src++;
+#else
+ if (n > 0)
+ memcpy ((char *) dest, (const char *) src, n * sizeof (UNIT));
+#endif
+ return dest;
+}