glibc/wcsmbs/wcsncat.c

/* Copyright (C) 1995-2019 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995.

   The GNU C Library 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.

   The GNU C Library 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 the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

#include <wchar.h>

#ifndef WCSNCAT
# define WCSNCAT wcsncat
#endif

/* Append no more than N wide-character of SRC onto DEST.  */
wchar_t *
WCSNCAT (wchar_t *dest, const wchar_t *src, size_t n)
{
  wchar_t *ret = dest;

  /* Find the end of dest.  */
  dest += __wcslen (dest);

  size_t ds = __wcsnlen (src, n);

  dest[ds] = L'\0';
  __wmemcpy (dest, src, ds);

  return ret;
}