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    1: /*	$OpenBSD: strlcat.c,v 1.8 2001/05/13 15:40:15 deraadt Exp $	*/
    2: 
    3: /*
    4:  * Copyright (c) 1998, 2003-2005, 2010-2011
    5:  *	Todd C. Miller <Todd.Miller@courtesan.com>
    6:  *
    7:  * Permission to use, copy, modify, and distribute this software for any
    8:  * purpose with or without fee is hereby granted, provided that the above
    9:  * copyright notice and this permission notice appear in all copies.
   10:  *
   11:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   12:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   13:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   14:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   15:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   16:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   17:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   18:  */
   19: 
   20: #include <config.h>
   21: 
   22: #include <sys/types.h>
   23: #include <string.h>
   24: 
   25: #include "missing.h"
   26: 
   27: /*
   28:  * Appends src to string dst of size siz (unlike strncat, siz is the
   29:  * full size of dst, not space left).  At most siz-1 characters
   30:  * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
   31:  * Returns strlen(src) + MIN(siz, strlen(initial dst)).
   32:  * If retval >= siz, truncation occurred.
   33:  */
   34: size_t
   35: strlcat(char *dst, const char *src, size_t siz)
   36: {
   37: 	char *d = dst;
   38: 	const char *s = src;
   39: 	size_t n = siz;
   40: 	size_t dlen;
   41: 
   42: 	/* Find the end of dst and adjust bytes left but don't go past end */
   43: 	while (n-- != 0 && *d != '\0')
   44: 		d++;
   45: 	dlen = d - dst;
   46: 	n = siz - dlen;
   47: 
   48: 	if (n == 0)
   49: 		return dlen + strlen(s);
   50: 	while (*s != '\0') {
   51: 		if (n != 1) {
   52: 			*d++ = *s;
   53: 			n--;
   54: 		}
   55: 		s++;
   56: 	}
   57: 	*d = '\0';
   58: 
   59: 	return dlen + (s - src);	/* count does not include NUL */
   60: }