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 1.11 2006/05/05 15:27:38 millert Exp $    */
    2 
    3 /*-
    4  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
    5  *
    6  * Permission to use, copy, modify, and distribute this software for any
    7  * purpose with or without fee is hereby granted, provided that the above
    8  * copyright notice and this permission notice appear in all copies.
    9  *
   10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   17  */
   18 
   19 #include <sys/cdefs.h>
   20 __FBSDID("$FreeBSD: stable/11/sys/libkern/strlcpy.c 242507 2012-11-03 04:29:24Z delphij $");
   21 
   22 #include <sys/types.h>
   23 #include <sys/libkern.h>
   24 
   25 /*
   26  * Copy src to string dst of size siz.  At most siz-1 characters
   27  * will be copied.  Always NUL terminates (unless siz == 0).
   28  * Returns strlen(src); if retval >= siz, truncation occurred.
   29  */
   30 size_t
   31 strlcpy(char * __restrict dst, const char * __restrict src, size_t siz)
   32 {
   33         char *d = dst;
   34         const char *s = src;
   35         size_t n = siz;
   36 
   37         /* Copy as many bytes as will fit */
   38         if (n != 0) {
   39                 while (--n != 0) {
   40                         if ((*d++ = *s++) == '\0')
   41                                 break;
   42                 }
   43         }
   44 
   45         /* Not enough room in dst, add NUL and traverse rest of src */
   46         if (n == 0) {
   47                 if (siz != 0)
   48                         *d = '\0';              /* NUL-terminate dst */
   49                 while (*s++)
   50                         ;
   51         }
   52 
   53         return(s - src - 1);    /* count does not include NUL */
   54 }

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