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 */ 37 char * 38 strndup(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