1 /* $NetBSD: strncpy.c,v 1.9 2003/08/07 16:32:11 agc Exp $ */
2
3 /*-
4 * Copyright (c) 1990, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Chris Torek.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 #include <sys/cdefs.h>
36 #if defined(LIBC_SCCS) && !defined(lint)
37 #if 0
38 static char sccsid[] = "@(#)strncpy.c 8.1 (Berkeley) 6/4/93";
39 #else
40 __RCSID("$NetBSD: strncpy.c,v 1.9 2003/08/07 16:32:11 agc Exp $");
41 #endif
42 #endif /* LIBC_SCCS and not lint */
43
44 #if !defined(_KERNEL) && !defined(_STANDALONE)
45 #include <string.h>
46 #else
47 #include <lib/libkern/libkern.h>
48 #endif
49
50 /*
51 * Copy src to dst, truncating or null-padding to always copy n bytes.
52 * Return dst.
53 */
54 char *
55 strncpy(dst, src, n)
56 char *dst;
57 const char *src;
58 size_t n;
59 {
60 if (n != 0) {
61 char *d = dst;
62 const char *s = src;
63
64 do {
65 if ((*d++ = *s++) == 0) {
66 /* NUL pad the remaining n-1 bytes */
67 while (--n != 0)
68 *d++ = 0;
69 break;
70 }
71 } while (--n != 0);
72 }
73 return (dst);
74 }
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