1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22/*
23 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright 2018 Joyent, Inc.
25 */
26
27#include "lint.h"
28#include <string.h>
29#include <strings.h>
30#include <stdlib.h>
31#include <sys/types.h>
32
33/*
34 * Create a copy of string s, but only duplicate the first n bytes.
35 * Return NULL if the new string can't be allocated.
36 */
37char *
38strndup(const char *s1, size_t n)
39{
40	char *s2;
41
42	n = strnlen(s1, n);
43	if ((s2 = malloc(n + 1)) != NULL) {
44		bcopy(s1, s2, n);
45		s2[n] = '\0';
46	}
47
48	return (s2);
49}
50