1  /* Copyright (C) 1996-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <wchar.h>
      19  
      20  #define __need_ptrdiff_t
      21  #include <stddef.h>
      22  
      23  
      24  /* Copy SRC to DEST, returning the address of the terminating L'\0' in
      25     DEST.  Check for overflows.  */
      26  wchar_t *
      27  __wcpcpy_chk (wchar_t *dest, const wchar_t *src, size_t destlen)
      28  {
      29    wchar_t *wcp = (wchar_t *) dest - 1;
      30    wint_t c;
      31  
      32    do
      33      {
      34        if (__glibc_unlikely (destlen-- == 0))
      35  	__chk_fail ();
      36        c = *src++;
      37        *++wcp = c;
      38      }
      39    while (c != L'\0');
      40  
      41    return wcp;
      42  }