Embedded Artistry libc
C Standard Library Support for Bare-metal Systems
strndup.c
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1 /* $NetBSD: strndup.c,v 1.3 2007/01/14 23:41:24 cbiere Exp $ */
2 
3 /*
4  * Copyright (c) 1988, 1993
5  * The Regents of the University of California. All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  * notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  * notice, this list of conditions and the following disclaimer in the
14  * documentation and/or other materials provided with the distribution.
15  * 4. Neither the name of the University nor the names of its contributors
16  * may be used to endorse or promote products derived from this software
17  * without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  * SUCH DAMAGE.
30  */
31 
32 #if 0
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD: src/lib/libc/string/strndup.c,v 1.1 2008/12/06 09:37:54 kib Exp $");
35 #endif
36 
37 #include <stddef.h>
38 #include <stdlib.h>
39 #include <string.h>
40 
41 char* strndup(const char* str, size_t n)
42 {
43  char* copy = NULL;
44 
45  if(str && n)
46  {
47  size_t len;
48 
49  for(len = 0; len < n && str[len]; len++)
50  {
51  }
52 
53  if((copy = malloc(len + 1)) == NULL)
54  {
55  return (NULL);
56  }
57 
58  memcpy(copy, str, len);
59  copy[len] = '\0';
60  }
61 
62  return copy;
63 }
strndup
char * strndup(const char *str, size_t n)
Duplicate n bytes of the passed in string str.
Definition: strndup.c:41
NULL
#define NULL
Definition: stddef.h:15
malloc
void * malloc(size_t size)
Allocates size bytes of uninitialized storage.
memcpy
void * memcpy(void *__restrict dest, const void *__restrict src, size_t n)
Copies n characters from the object pointed to by src to the object pointed to by dest.