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  #ifdef HAVE_CONFIG_H
      19  # include "config.h"
      20  #endif
      21  
      22  #include <stdio.h>
      23  #include <sys/types.h>
      24  
      25  #if defined _LIBC || defined STDC_HEADERS
      26  # include <stdlib.h>
      27  # include <string.h>
      28  #else
      29  char *malloc ();
      30  #endif
      31  
      32  #undef __strndup
      33  #undef strndup
      34  
      35  #ifndef weak_alias
      36  # define __strndup strndup
      37  #endif
      38  
      39  char *
      40  __strndup (const char *s, size_t n)
      41  {
      42    size_t len = __strnlen (s, n);
      43    char *new = (char *) malloc (len + 1);
      44  
      45    if (new == NULL)
      46      return NULL;
      47  
      48    new[len] = '\0';
      49    return (char *) memcpy (new, s, len);
      50  }
      51  #ifdef libc_hidden_def
      52  libc_hidden_def (__strndup)
      53  #endif
      54  #ifdef weak_alias
      55  weak_alias (__strndup, strndup)
      56  #endif