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/strlcpy.c

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    1 /*      $OpenBSD: strlcpy.c,v 1.4 1999/05/01 18:56:41 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: strlcpy.c,v 1.4 1999/05/01 18:56:41 millert Exp $";
   32 #endif /* LIBC_SCCS and not lint */
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD: releng/8.3/sys/libkern/strlcpy.c 199583 2009-11-20 15:27:52Z jhb $");
   35 
   36 #include <sys/types.h>
   37 #include <sys/libkern.h>
   38 
   39 /*
   40  * Copy src to string dst of size siz.  At most siz-1 characters
   41  * will be copied.  Always NUL terminates (unless siz == 0).
   42  * Returns strlen(src); if retval >= siz, truncation occurred.
   43  */
   44 size_t strlcpy(dst, src, siz)
   45         char *dst;
   46         const char *src;
   47         size_t siz;
   48 {
   49         char *d = dst;
   50         const char *s = src;
   51         size_t n = siz;
   52 
   53         /* Copy as many bytes as will fit */
   54         if (n != 0 && --n != 0) {
   55                 do {
   56                         if ((*d++ = *s++) == 0)
   57                                 break;
   58                 } while (--n != 0);
   59         }
   60 
   61         /* Not enough room in dst, add NUL and traverse rest of src */
   62         if (n == 0) {
   63                 if (siz != 0)
   64                         *d = '\0';              /* NUL-terminate dst */
   65                 while (*s++)
   66                         ;
   67         }
   68 
   69         return(s - src - 1);    /* count does not include NUL */
   70 }

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