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 (at) 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 #ifdef HAVE_CONFIG_H 32 #include <config.h> 33 #endif 34 35 #include <netdissect-stdinc.h> 36 37 #include <string.h> 38 39 #include "netdissect.h" 40 41 /* 42 * Appends src to string dst of size siz (unlike strncat, siz is the 43 * full size of dst, not space left). At most siz-1 characters 44 * will be copied. Always NUL terminates (unless siz == 0). 45 * Returns strlen(src); if retval >= siz, truncation occurred. 46 */ 47 size_t 48 strlcat(char *dst, const char *src, size_t siz) 49 { 50 register char *d = dst; 51 register const char *s = src; 52 register size_t n = siz; 53 size_t dlen; 54 55 /* Find the end of dst and adjust bytes left but don't go past end */ 56 while (*d != '\0' && n-- != 0) 57 d++; 58 dlen = d - dst; 59 n = siz - dlen; 60 61 if (n == 0) 62 return(dlen + strlen(s)); 63 while (*s != '\0') { 64 if (n != 1) { 65 *d++ = *s; 66 n--; 67 } 68 s++; 69 } 70 *d = '\0'; 71 72 return(dlen + (s - src)); /* count does not include NUL */ 73 } 74
