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  #ifdef HAVE_CONFIG_H
      19  #include <config.h>
      20  #endif
      21  
      22  #if defined _LIBC || defined  STDC_HEADERS
      23  # include <stdlib.h>
      24  # include <string.h>
      25  #else
      26  char *malloc ();
      27  char *memcpy ();
      28  #endif
      29  
      30  #undef __strdup
      31  #undef strdup
      32  
      33  #ifndef weak_alias
      34  # define __strdup strdup
      35  #endif
      36  
      37  /* Duplicate S, returning an identical malloc'd string.  */
      38  char *
      39  __strdup (const char *s)
      40  {
      41    size_t len = strlen (s) + 1;
      42    void *new = malloc (len);
      43  
      44    if (new == NULL)
      45      return NULL;
      46  
      47    return (char *) memcpy (new, s, len);
      48  }
      49  #ifdef libc_hidden_def
      50  libc_hidden_def (__strdup)
      51  #endif
      52  #ifdef weak_alias
      53  weak_alias (__strdup, strdup)
      54  #endif