1  /* Copyright (C) 1993-2023 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  /* This is almost copied from strncpy.c, written by Torbjorn Granlund.  */
      19  
      20  #include <string.h>
      21  
      22  
      23  /* Copy no more than N characters of SRC to DEST, returning the address of
      24     the terminating '\0' in DEST, if any, or else DEST + N.  */
      25  char *
      26  __stpncpy_chk (char *dest, const char *src, size_t n, size_t destlen)
      27  {
      28    if (__builtin_expect (destlen < n, 0))
      29      __chk_fail ();
      30  
      31    return __stpncpy (dest, src, n);
      32  }