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