nataraid(4): Add devstat support.
[dragonfly.git] / sys / libkern / strncpy.c
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1/*-
2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Chris Torek.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
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36 * $FreeBSD: src/sys/libkern/strncpy.c,v 1.8 2003/02/10 00:36:27 hsu Exp $
37 * $DragonFly: src/sys/libkern/strncpy.c,v 1.5 2004/05/05 00:17:44 hsu Exp $
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38 */
39
1f2de5d4 40#include <sys/libkern.h>
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41
42/*
43 * Copy src to dst, truncating or null-padding to always copy n bytes.
44 * Return dst.
45 */
46char *
0400eaad 47strncpy(char * __restrict dst, const char * __restrict src, size_t n)
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48{
49 if (n != 0) {
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50 char *d = dst;
51 const char *s = src;
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52
53 do {
54 if ((*d++ = *s++) == 0) {
55 /* NUL pad the remaining n-1 bytes */
56 while (--n != 0)
57 *d++ = 0;
58 break;
59 }
60 } while (--n != 0);
61 }
62 return (dst);
63}