strlcpy.c

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    1 /*      $NetBSD: strlcpy.c,v 1.2 2003/05/15 15:02:52 itojun Exp $       */
    2 /*      $OpenBSD: strlcpy.c,v 1.7 2003/04/12 21:56:39 millert Exp $     */
    3 
    4 /*
    5  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
    6  *
    7  * Permission to use, copy, modify, and distribute this software for any
    8  * purpose with or without fee is hereby granted, provided that the above
    9  * copyright notice and this permission notice appear in all copies.
   10  *
   11  * THE SOFTWARE IS PROVIDED "AS IS" AND TODD C. MILLER DISCLAIMS ALL
   12  * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
   13  * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER BE LIABLE
   14  * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
   16  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
   17  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   18  */
   19 
   20 #include <sys/cdefs.h>
   21 #if defined(LIBC_SCCS) && !defined(lint)
   22 __RCSID("$NetBSD: strlcpy.c,v 1.2 2003/05/15 15:02:52 itojun Exp $");
   23 #endif /* LIBC_SCCS and not lint */
   24 
   25 #include <sys/param.h>
   26 #include <lib/libkern/libkern.h>
   27 
   28 /*
   29  * Copy src to string dst of size siz.  At most siz-1 characters
   30  * will be copied.  Always NUL terminates (unless siz == 0).
   31  * Returns strlen(src); if retval >= siz, truncation occurred.
   32  */
   33 size_t
   34 strlcpy(dst, src, siz)
   35         char *dst;
   36         const char *src;
   37         size_t siz;
   38 {
   39         char *d = dst;
   40         const char *s = src;
   41         size_t n = siz;
   42 
   43         /* Copy as many bytes as will fit */
   44         if (n != 0 && --n != 0) {
   45                 do {
   46                         if ((*d++ = *s++) == 0)
   47                                 break;
   48                 } while (--n != 0);
   49         }
   50 
   51         /* Not enough room in dst, add NUL and traverse rest of src */
   52         if (n == 0) {
   53                 if (siz != 0)
   54                         *d = '\0';              /* NUL-terminate dst */
   55                 while (*s++)
   56                         ;
   57         }
   58 
   59         return(s - src - 1);    /* count does not include NUL */
   60 }

Cache object: 939d425a2d5c7207a2e456906110f577

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FreeBSD/Linux Kernel Cross Reference sys/lib/libkern/strlcpy.c

FreeBSD/Linux Kernel Cross Reference
sys/lib/libkern/strlcpy.c