1*22028508SToomas Soome /*-
2*22028508SToomas Soome * Copyright (c) 1990, 1993
3*22028508SToomas Soome * The Regents of the University of California. All rights reserved.
4*22028508SToomas Soome *
5*22028508SToomas Soome * This code is derived from software contributed to Berkeley by
6*22028508SToomas Soome * Chris Torek.
7*22028508SToomas Soome *
8*22028508SToomas Soome * Redistribution and use in source and binary forms, with or without
9*22028508SToomas Soome * modification, are permitted provided that the following conditions
10*22028508SToomas Soome * are met:
11*22028508SToomas Soome * 1. Redistributions of source code must retain the above copyright
12*22028508SToomas Soome * notice, this list of conditions and the following disclaimer.
13*22028508SToomas Soome * 2. Redistributions in binary form must reproduce the above copyright
14*22028508SToomas Soome * notice, this list of conditions and the following disclaimer in the
15*22028508SToomas Soome * documentation and/or other materials provided with the distribution.
16*22028508SToomas Soome * 3. Neither the name of the University nor the names of its contributors
17*22028508SToomas Soome * may be used to endorse or promote products derived from this software
18*22028508SToomas Soome * without specific prior written permission.
19*22028508SToomas Soome *
20*22028508SToomas Soome * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21*22028508SToomas Soome * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22*22028508SToomas Soome * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23*22028508SToomas Soome * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24*22028508SToomas Soome * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25*22028508SToomas Soome * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26*22028508SToomas Soome * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27*22028508SToomas Soome * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28*22028508SToomas Soome * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29*22028508SToomas Soome * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30*22028508SToomas Soome * SUCH DAMAGE.
31*22028508SToomas Soome */
32*22028508SToomas Soome
33*22028508SToomas Soome #if defined(LIBC_SCCS) && !defined(lint)
34*22028508SToomas Soome static char sccsid[] = "@(#)strncpy.c 8.1 (Berkeley) 6/4/93";
35*22028508SToomas Soome #endif /* LIBC_SCCS and not lint */
36*22028508SToomas Soome #include <sys/cdefs.h>
37*22028508SToomas Soome __FBSDID("$FreeBSD$");
38*22028508SToomas Soome
39*22028508SToomas Soome #include <string.h>
40*22028508SToomas Soome
41*22028508SToomas Soome /*
42*22028508SToomas Soome * Copy src to dst, truncating or null-padding to always copy n bytes.
43*22028508SToomas Soome * Return dst.
44*22028508SToomas Soome */
45*22028508SToomas Soome char *
strncpy(char * __restrict dst,const char * __restrict src,size_t n)46*22028508SToomas Soome strncpy(char * __restrict dst, const char * __restrict src, size_t n)
47*22028508SToomas Soome {
48*22028508SToomas Soome if (n != 0) {
49*22028508SToomas Soome char *d = dst;
50*22028508SToomas Soome const char *s = src;
51*22028508SToomas Soome
52*22028508SToomas Soome do {
53*22028508SToomas Soome if ((*d++ = *s++) == '\0') {
54*22028508SToomas Soome /* NUL pad the remaining n-1 bytes */
55*22028508SToomas Soome while (--n != 0)
56*22028508SToomas Soome *d++ = '\0';
57*22028508SToomas Soome break;
58*22028508SToomas Soome }
59*22028508SToomas Soome } while (--n != 0);
60*22028508SToomas Soome }
61*22028508SToomas Soome return (dst);
62*22028508SToomas Soome }
63