string/strdup.c

   1 /* Copyright (C) 1991, 1996, 1997, 1998 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 Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    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    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #ifdef HAVE_CONFIG_H
  20 #include <config.h>
  21 #endif
  22
  23 #if defined _LIBC || defined  STDC_HEADERS
  24 # include <stdlib.h>
  25 # include <string.h>
  26 #else
  27 char *malloc ();
  28 char *memcpy ();
  29 #endif
  30
  31 #undef __strdup
  32 #undef strdup
  33
  34 #ifndef weak_alias
  35 # define __strdup strdup
  36 #endif
  37
  38 /* Duplicate S, returning an identical malloc'd string.  */
  39 char *
  40 __strdup (const char *s)
  41 {
  42   size_t len = strlen (s) + 1;
  43   void *new = malloc (len);
  44
  45   if (new == NULL)
  46     return NULL;
  47
  48   return (char *) memcpy (new, s, len);
  49 }
  50 #ifdef weak_alias
  51 weak_alias (__strdup, strdup)
  52 #endif