1/* Implement the strndup function.
2   Copyright (C) 2005 Free Software Foundation, Inc.
3   Written by Kaveh R. Ghazi <ghazi@caip.rutgers.edu>.
4
5This file is part of the libiberty library.
6Libiberty is free software; you can redistribute it and/or
7modify it under the terms of the GNU Library General Public
8License as published by the Free Software Foundation; either
9version 2 of the License, or (at your option) any later version.
10
11Libiberty is distributed in the hope that it will be useful,
12but WITHOUT ANY WARRANTY; without even the implied warranty of
13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14Library General Public License for more details.
15
16You should have received a copy of the GNU Library General Public
17License along with libiberty; see the file COPYING.LIB.  If
18not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
19Boston, MA 02110-1301, USA.  */
20
21/*
22
23@deftypefn Extension char* strndup (const char *@var{s}, size_t @var{n})
24
25Returns a pointer to a copy of @var{s} with at most @var{n} characters
26in memory obtained from @code{malloc}, or @code{NULL} if insufficient
27memory was available.  The result is always NUL terminated.
28
29@end deftypefn
30
31*/
32
33#include "ansidecl.h"
34#include <stddef.h>
35
36extern size_t	strlen (const char*);
37extern PTR	malloc (size_t);
38extern PTR	memcpy (PTR, const PTR, size_t);
39
40char *
41strndup (const char *s, size_t n)
42{
43  char *result;
44  size_t len = strlen (s);
45
46  if (n < len)
47    len = n;
48
49  result = (char *) malloc (len + 1);
50  if (!result)
51    return 0;
52
53  result[len] = '\0';
54  return (char *) memcpy (result, s, len);
55}
56