external/bsd/libevent/dist/strlcpy.c

   1 /*      $NetBSD: strlcpy.c,v 1.1.1.1 2013/04/11 16:43:21 christos Exp $ */
   2 /*      $OpenBSD: strlcpy.c,v 1.5 2001/05/13 15:40:16 deraadt 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 #if defined(LIBC_SCCS) && !defined(lint)
  32 static char *rcsid = "$OpenBSD: strlcpy.c,v 1.5 2001/05/13 15:40:16 deraadt Exp $";
  33 #endif /* LIBC_SCCS and not lint */
  34
  35 #include <sys/types.h>
  36
  37 #include "event2/event-config.h"
  38 #include <sys/cdefs.h>
  39 __RCSID("$NetBSD: strlcpy.c,v 1.1.1.1 2013/04/11 16:43:21 christos Exp $");
  40
  41 #ifndef _EVENT_HAVE_STRLCPY
  42 #include "strlcpy-internal.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 _event_strlcpy(dst, src, siz)
  51         char *dst;
  52         const char *src;
  53         size_t siz;
  54 {
  55         register char *d = dst;
  56         register const char *s = src;
  57         register size_t n = siz;
  58
  59         /* Copy as many bytes as will fit */
  60         if (n != 0 && --n != 0) {
  61                 do {
  62                         if ((*d++ = *s++) == 0)
  63                                 break;
  64                 } while (--n != 0);
  65         }
  66
  67         /* Not enough room in dst, add NUL and traverse rest of src */
  68         if (n == 0) {
  69                 if (siz != 0)
  70                         *d = '\0';              /* NUL-terminate dst */
  71                 while (*s++)
  72                         ;
  73         }
  74
  75         return (s - src - 1);   /* count does not include NUL */
  76 }
  77 #endif