1 /* $NetBSD: strlcat.c,v 1.5 1999/09/20 04:39:47 lukem Exp $ */ 2 /* from OpenBSD: strlcat.c,v 1.2 1999/06/17 16:28:58 millert Exp */ 3 4 /* 5 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> 6 * All rights reserved. 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. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 20 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 21 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 22 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 23 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 24 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 25 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 26 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 27 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 28 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #ifndef lint 32 static const char rcsid[] = 33 "@(#) $Header: /tcpdump/master/tcpdump/missing/strlcat.c,v 1.1 2000/01/19 05:34:19 itojun Exp $ (LBL)"; 34 #endif 35 36 #include <config.h> 37 38 #include <sys/types.h> 39 #include <string.h> 40 41 #include "interface.h" 42 43 /* 44 * Appends src to string dst of size siz (unlike strncat, siz is the 45 * full size of dst, not space left). At most siz-1 characters 46 * will be copied. Always NUL terminates (unless siz == 0). 47 * Returns strlen(src); if retval >= siz, truncation occurred. 48 */ 49 size_t 50 strlcat(dst, src, siz) 51 char *dst; 52 const char *src; 53 size_t siz; 54 { 55 register char *d = dst; 56 register const char *s = src; 57 register size_t n = siz; 58 size_t dlen; 59 60 /* Find the end of dst and adjust bytes left but don't go past end */ 61 while (*d != '\0' && n-- != 0) 62 d++; 63 dlen = d - dst; 64 n = siz - dlen; 65 66 if (n == 0) 67 return(dlen + strlen(s)); 68 while (*s != '\0') { 69 if (n != 1) { 70 *d++ = *s; 71 n--; 72 } 73 s++; 74 } 75 *d = '\0'; 76 77 return(dlen + (s - src)); /* count does not include NUL */ 78 } 79