1*0a6a1f1dSLionel Sambuc /* $NetBSD: strncat.c,v 1.2 2013/12/27 20:26:53 christos Exp $ */
2*0a6a1f1dSLionel Sambuc
3*0a6a1f1dSLionel Sambuc /*-
4*0a6a1f1dSLionel Sambuc * Copyright (c) 1990, 1993
5*0a6a1f1dSLionel Sambuc * The Regents of the University of California. All rights reserved.
6*0a6a1f1dSLionel Sambuc *
7*0a6a1f1dSLionel Sambuc * This code is derived from software contributed to Berkeley by
8*0a6a1f1dSLionel Sambuc * Chris Torek.
9*0a6a1f1dSLionel Sambuc *
10*0a6a1f1dSLionel Sambuc * Redistribution and use in source and binary forms, with or without
11*0a6a1f1dSLionel Sambuc * modification, are permitted provided that the following conditions
12*0a6a1f1dSLionel Sambuc * are met:
13*0a6a1f1dSLionel Sambuc * 1. Redistributions of source code must retain the above copyright
14*0a6a1f1dSLionel Sambuc * notice, this list of conditions and the following disclaimer.
15*0a6a1f1dSLionel Sambuc * 2. Redistributions in binary form must reproduce the above copyright
16*0a6a1f1dSLionel Sambuc * notice, this list of conditions and the following disclaimer in the
17*0a6a1f1dSLionel Sambuc * documentation and/or other materials provided with the distribution.
18*0a6a1f1dSLionel Sambuc * 3. Neither the name of the University nor the names of its contributors
19*0a6a1f1dSLionel Sambuc * may be used to endorse or promote products derived from this software
20*0a6a1f1dSLionel Sambuc * without specific prior written permission.
21*0a6a1f1dSLionel Sambuc *
22*0a6a1f1dSLionel Sambuc * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23*0a6a1f1dSLionel Sambuc * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24*0a6a1f1dSLionel Sambuc * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25*0a6a1f1dSLionel Sambuc * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26*0a6a1f1dSLionel Sambuc * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27*0a6a1f1dSLionel Sambuc * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28*0a6a1f1dSLionel Sambuc * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29*0a6a1f1dSLionel Sambuc * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30*0a6a1f1dSLionel Sambuc * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31*0a6a1f1dSLionel Sambuc * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32*0a6a1f1dSLionel Sambuc * SUCH DAMAGE.
33*0a6a1f1dSLionel Sambuc */
34*0a6a1f1dSLionel Sambuc
35*0a6a1f1dSLionel Sambuc #include <sys/cdefs.h>
36*0a6a1f1dSLionel Sambuc #if defined(LIBC_SCCS) && !defined(lint)
37*0a6a1f1dSLionel Sambuc #if 0
38*0a6a1f1dSLionel Sambuc static char sccsid[] = "@(#)strncat.c 8.1 (Berkeley) 6/4/93";
39*0a6a1f1dSLionel Sambuc #else
40*0a6a1f1dSLionel Sambuc __RCSID("$NetBSD: strncat.c,v 1.2 2013/12/27 20:26:53 christos Exp $");
41*0a6a1f1dSLionel Sambuc #endif
42*0a6a1f1dSLionel Sambuc #endif /* LIBC_SCCS and not lint */
43*0a6a1f1dSLionel Sambuc
44*0a6a1f1dSLionel Sambuc #if !defined(_KERNEL) && !defined(_STANDALONE)
45*0a6a1f1dSLionel Sambuc #include <assert.h>
46*0a6a1f1dSLionel Sambuc #include <string.h>
47*0a6a1f1dSLionel Sambuc #else
48*0a6a1f1dSLionel Sambuc #include <lib/libkern/libkern.h>
49*0a6a1f1dSLionel Sambuc #endif
50*0a6a1f1dSLionel Sambuc
51*0a6a1f1dSLionel Sambuc #ifdef _FORTIFY_SOURCE
52*0a6a1f1dSLionel Sambuc #undef strncat
53*0a6a1f1dSLionel Sambuc #endif
54*0a6a1f1dSLionel Sambuc
55*0a6a1f1dSLionel Sambuc /*
56*0a6a1f1dSLionel Sambuc * Concatenate src on the end of dst. At most strlen(dst)+n+1 bytes
57*0a6a1f1dSLionel Sambuc * are written at dst (at most n+1 bytes being appended). Return dst.
58*0a6a1f1dSLionel Sambuc */
59*0a6a1f1dSLionel Sambuc char *
strncat(char * dst,const char * src,size_t n)60*0a6a1f1dSLionel Sambuc strncat(char *dst, const char *src, size_t n)
61*0a6a1f1dSLionel Sambuc {
62*0a6a1f1dSLionel Sambuc
63*0a6a1f1dSLionel Sambuc _DIAGASSERT(dst != NULL);
64*0a6a1f1dSLionel Sambuc _DIAGASSERT(src != NULL);
65*0a6a1f1dSLionel Sambuc
66*0a6a1f1dSLionel Sambuc if (n != 0) {
67*0a6a1f1dSLionel Sambuc char *d = dst;
68*0a6a1f1dSLionel Sambuc const char *s = src;
69*0a6a1f1dSLionel Sambuc
70*0a6a1f1dSLionel Sambuc while (*d != 0)
71*0a6a1f1dSLionel Sambuc d++;
72*0a6a1f1dSLionel Sambuc do {
73*0a6a1f1dSLionel Sambuc if ((*d = *s++) == 0)
74*0a6a1f1dSLionel Sambuc break;
75*0a6a1f1dSLionel Sambuc d++;
76*0a6a1f1dSLionel Sambuc } while (--n != 0);
77*0a6a1f1dSLionel Sambuc *d = 0;
78*0a6a1f1dSLionel Sambuc }
79*0a6a1f1dSLionel Sambuc return (dst);
80*0a6a1f1dSLionel Sambuc }
81