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 /*
    2  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. The name of the author may not be used to endorse or promote products
   14  *    derived from this software without specific prior written permission.
   15  *
   16  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
   17  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
   18  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
   19  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   20  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
   22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   26  *
   27  * $OpenBSD: strlcpy.c,v 1.4 1999/05/01 18:56:41 millert Exp $
   28  * $FreeBSD: src/lib/libc/string/strlcpy.c,v 1.2.4.1 2001/07/09 23:30:06 obrien Exp $
   29  * $DragonFly: src/sys/libkern/strlcpy.c,v 1.5 2007/06/07 23:45:02 dillon Exp $
   30  */
   31 
   32 #include <sys/types.h>
   33 #include <sys/libkern.h>
   34 
   35 /*
   36  * Copy src to string dst of size siz.  At most siz-1 characters
   37  * will be copied.  Always NUL terminates (unless siz == 0).
   38  * Returns strlen(src); if retval >= siz, truncation occurred.
   39  */
   40 size_t
   41 strlcpy(char *dst, const char *src, size_t siz)
   42 {
   43         char *d = dst;
   44         const char *s = src;
   45         size_t n = siz;
   46 
   47         /* Copy as many bytes as will fit */
   48         if (n != 0 && --n != 0) {
   49                 do {
   50                         if ((*d++ = *s++) == 0)
   51                                 break;
   52                 } while (--n != 0);
   53         }
   54 
   55         /* Not enough room in dst, add NUL and traverse rest of src */
   56         if (n == 0) {
   57                 if (siz != 0)
   58                         *d = '\0';              /* NUL-terminate dst */
   59                 while (*s++)
   60                         ;
   61         }
   62 
   63         return(s - src - 1);    /* count does not include NUL */
   64 }

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