string/strdup.c

   1 /* Copyright (C) 1991-2018 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    <http://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