contrib/tcpdump-3.8.3/missing/strlcpy.c

   1 /*      $NetBSD: strlcpy.c,v 1.5 1999/09/20 04:39:47 lukem Exp $        */
   2 /*      from OpenBSD: strlcpy.c,v 1.4 1999/05/01 18:56:41 millert Exp   */
   3
   4 /*
   5  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. The name of the author may not be used to endorse or promote products
  17  *    derived from this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
  20  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
  21  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
  22  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  23  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  24  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  25  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  26  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  27  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  28  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 #ifndef lint
  32 static const char rcsid[] _U_ =
  33     "@(#) $Header: /tcpdump/master/tcpdump/missing/strlcpy.c,v 1.3.2.2 2003/11/16 08:52:03 guy Exp $ (LBL)";
  34 #endif
  35
  36 #ifdef HAVE_CONFIG_H
  37 #include <config.h>
  38 #endif
  39
  40 #include <tcpdump-stdinc.h>
  41
  42 #include <string.h>
  43
  44 /*
  45  * Copy src to string dst of size siz.  At most siz-1 characters
  46  * will be copied.  Always NUL terminates (unless siz == 0).
  47  * Returns strlen(src); if retval >= siz, truncation occurred.
  48  */
  49 size_t
  50 strlcpy(char *dst, const char *src, size_t siz)
  51 {
  52         register char *d = dst;
  53         register const char *s = src;
  54         register size_t n = siz;
  55
  56         /* Copy as many bytes as will fit */
  57         if (n != 0 && --n != 0) {
  58                 do {
  59                         if ((*d++ = *s++) == 0)
  60                                 break;
  61                 } while (--n != 0);
  62         }
  63
  64         /* Not enough room in dst, add NUL and traverse rest of src */
  65         if (n == 0) {
  66                 if (siz != 0)
  67                         *d = '\0';              /* NUL-terminate dst */
  68                 while (*s++)
  69                         ;
  70         }
  71
  72         return(s - src - 1);    /* count does not include NUL */
  73 }