strndup.c revision b7f2b4d529ee03ee0e4172cc06e7cd973bd9bef5 
1/* Copyright (C) 1996, 1997, 1998, 2001, 2002, 2003, 2005, 2006 Free
2   Software Foundation, Inc.
3
4   NOTE: The canonical source of this file is maintained with the GNU C Library.
5   Bugs can be reported to bug-glibc@prep.ai.mit.edu.
6
7   This program is free software; you can redistribute it and/or modify it
8   under the terms of the GNU General Public License as published by the
9   Free Software Foundation; either version 2, or (at your option) any
10   later version.
11
12   This program is distributed in the hope that it will be useful,
13   but WITHOUT ANY WARRANTY; without even the implied warranty of
14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15   GNU General Public License for more details.
16
17   You should have received a copy of the GNU General Public License
18   along with this program; if not, write to the Free Software Foundation,
19   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
20
21#ifdef HAVE_CONFIG_H
22# include <config.h>
23#endif
24#if !_LIBC
25# include "strndup.h"
26#endif
27
28#include <stdlib.h>
29#include <string.h>
30
31#if !_LIBC
32# include "strnlen.h"
33# ifndef __strnlen
34#  define __strnlen strnlen
35# endif
36#endif
37
38#undef __strndup
39#if _LIBC
40# undef strndup
41#endif
42
43#ifndef weak_alias
44# define __strndup strndup
45#endif
46
47char *
48__strndup (s, n)
49     const char *s;
50     size_t n;
51{
52  size_t len = __strnlen (s, n);
53  char *new = malloc (len + 1);
54
55  if (new == NULL)
56    return NULL;
57
58  new[len] = '\0';
59  return memcpy (new, s, len);
60}
61#ifdef libc_hidden_def
62libc_hidden_def (__strndup)
63#endif
64#ifdef weak_alias
65weak_alias (__strndup, strndup)
66#endif
67