175115Sfenner/* $NetBSD: strlcat.c,v 1.5 1999/09/20 04:39:47 lukem Exp $ */ 275115Sfenner/* from OpenBSD: strlcat.c,v 1.2 1999/06/17 16:28:58 millert Exp */ 375115Sfenner 475115Sfenner/* 575115Sfenner * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> 675115Sfenner * All rights reserved. 775115Sfenner * 875115Sfenner * Redistribution and use in source and binary forms, with or without 975115Sfenner * modification, are permitted provided that the following conditions 1075115Sfenner * are met: 1175115Sfenner * 1. Redistributions of source code must retain the above copyright 1275115Sfenner * notice, this list of conditions and the following disclaimer. 1375115Sfenner * 2. Redistributions in binary form must reproduce the above copyright 1475115Sfenner * notice, this list of conditions and the following disclaimer in the 1575115Sfenner * documentation and/or other materials provided with the distribution. 1675115Sfenner * 3. The name of the author may not be used to endorse or promote products 1775115Sfenner * derived from this software without specific prior written permission. 1875115Sfenner * 1975115Sfenner * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 2075115Sfenner * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 2175115Sfenner * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 2275115Sfenner * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 2375115Sfenner * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 2475115Sfenner * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 2575115Sfenner * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 2675115Sfenner * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 2775115Sfenner * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 2875115Sfenner * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 2975115Sfenner */ 3075115Sfenner 3175115Sfenner#ifndef lint 32127668Sbmsstatic const char rcsid[] _U_ = 33190207Srpaulo "@(#) $Header: /tcpdump/master/tcpdump/missing/strlcat.c,v 1.5 2003-11-16 09:36:51 guy Exp $ (LBL)"; 3475115Sfenner#endif 3575115Sfenner 36127668Sbms#ifdef HAVE_CONFIG_H 3775115Sfenner#include <config.h> 38127668Sbms#endif 3975115Sfenner 40127668Sbms#include <tcpdump-stdinc.h> 41127668Sbms 4275115Sfenner#include <string.h> 4375115Sfenner 4475115Sfenner/* 4575115Sfenner * Appends src to string dst of size siz (unlike strncat, siz is the 4675115Sfenner * full size of dst, not space left). At most siz-1 characters 4775115Sfenner * will be copied. Always NUL terminates (unless siz == 0). 4875115Sfenner * Returns strlen(src); if retval >= siz, truncation occurred. 4975115Sfenner */ 5075115Sfennersize_t 51127668Sbmsstrlcat(char *dst, const char *src, size_t siz) 5275115Sfenner{ 5375115Sfenner register char *d = dst; 5475115Sfenner register const char *s = src; 5575115Sfenner register size_t n = siz; 5675115Sfenner size_t dlen; 5775115Sfenner 5875115Sfenner /* Find the end of dst and adjust bytes left but don't go past end */ 5975115Sfenner while (*d != '\0' && n-- != 0) 6075115Sfenner d++; 6175115Sfenner dlen = d - dst; 6275115Sfenner n = siz - dlen; 6375115Sfenner 6475115Sfenner if (n == 0) 6575115Sfenner return(dlen + strlen(s)); 6675115Sfenner while (*s != '\0') { 6775115Sfenner if (n != 1) { 6875115Sfenner *d++ = *s; 6975115Sfenner n--; 7075115Sfenner } 7175115Sfenner s++; 7275115Sfenner } 7375115Sfenner *d = '\0'; 7475115Sfenner 7575115Sfenner return(dlen + (s - src)); /* count does not include NUL */ 7675115Sfenner} 77