1 /* $NetBSD: stpncpy.c,v 1.2 2013/11/06 21:05:27 tron Exp $ */
2
3 /*-
4 * Copyright (c) 2009 David Schultz <das@FreeBSD.org>
5 * 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 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 #if defined(LIBC_SCCS) && !defined(lint)
31 __RCSID("$NetBSD: stpncpy.c,v 1.2 2013/11/06 21:05:27 tron Exp $");
32 #endif /* LIBC_SCCS and not lint */
33 /* FreeBSD: src/lib/libc/string/stpncpy.c,v 1.1 2009/02/28 06:00:58 das Exp */
34
35 #include <string.h>
36
37 #ifdef _FORTIFY_SOURCE
38 #undef stpncpy
39 #endif
40
41 char *
stpncpy(char * __restrict dst,const char * __restrict src,size_t n)42 stpncpy(char * __restrict dst, const char * __restrict src, size_t n)
43 {
44
45 for (; n--; dst++, src++) {
46 if (!(*dst = *src)) {
47 char *ret = dst;
48 while (n--)
49 *++dst = '\0';
50 return (ret);
51 }
52 }
53 return (dst);
54 }
55