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

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