1  /* Copyright (C) 1991-2023 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 <string.h>
      19  
      20  #ifndef STRNCAT
      21  # undef strncat
      22  # define STRNCAT  strncat
      23  # define STRNCAT_PRIMARY
      24  #endif
      25  
      26  char *
      27  STRNCAT (char *s1, const char *s2, size_t n)
      28  {
      29    char *s = s1;
      30  
      31    /* Find the end of S1.  */
      32    s1 += strlen (s1);
      33  
      34    size_t ss = __strnlen (s2, n);
      35  
      36    s1[ss] = '\0';
      37    memcpy (s1, s2, ss);
      38  
      39    return s;
      40  }
      41  #ifdef STRNCAT_PRIMARY
      42  strong_alias (STRNCAT, __strncat)
      43  libc_hidden_def (__strncat)
      44  #endif