The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/libkern/strlcat.c

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    1 /*      $OpenBSD: strlcat.c,v 1.2 1999/06/17 16:28:58 millert Exp $     */
    2 
    3 /*-
    4  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. The name of the author may not be used to endorse or promote products
   16  *    derived from this software without specific prior written permission.
   17  *
   18  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
   19  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
   20  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
   21  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   22  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   23  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
   24  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   25  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   26  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   27  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   28  */
   29 
   30 #if defined(LIBC_SCCS) && !defined(lint)
   31 static char *rcsid = "$OpenBSD: strlcat.c,v 1.2 1999/06/17 16:28:58 millert Exp $";
   32 #endif /* LIBC_SCCS and not lint */
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD: releng/7.4/sys/libkern/strlcat.c 141209 2005-02-03 15:51:39Z ru $");
   35 
   36 #include <sys/types.h>
   37 #include <sys/libkern.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 <= strlen(dst)).
   43  * Returns strlen(src) + MIN(siz, strlen(initial dst)).
   44  * If retval >= siz, truncation occurred.
   45  */
   46 size_t
   47 strlcat(dst, src, siz)
   48         char *dst;
   49         const char *src;
   50         size_t siz;
   51 {
   52         char *d = dst;
   53         const char *s = src;
   54         size_t n = siz;
   55         size_t dlen;
   56 
   57         /* Find the end of dst and adjust bytes left but don't go past end */
   58         while (n-- != 0 && *d != '\0')
   59                 d++;
   60         dlen = d - dst;
   61         n = siz - dlen;
   62 
   63         if (n == 0)
   64                 return(dlen + strlen(s));
   65         while (*s != '\0') {
   66                 if (n != 1) {
   67                         *d++ = *s;
   68                         n--;
   69                 }
   70                 s++;
   71         }
   72         *d = '\0';
   73 
   74         return(dlen + (s - src));       /* count does not include NUL */
   75 }

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