usr/src/lib/libc/port/gen/strndup.c

   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  */
  25
  26 #include "lint.h"
  27 #include <string.h>
  28 #include <stdlib.h>
  29 #include <sys/types.h>
  30
  31 /*
  32  * Create a copy of string s, but only duplicate the first n bytes.
  33  * Return NULL if the new string can't be allocated.
  34  */
  35 char *
  36 strndup(const char *s1, size_t n)
  37 {
  38         char *s2;
  39
  40         n = strnlen(s1, n);
  41         if ((s2 = malloc(n + 1)) != NULL)
  42                 (void) strlcpy(s2, s1, n + 1);
  43         return (s2);
  44 }