Line data    Source code

       1             : /*      $OpenBSD: strlcpy.c,v 1.5 2001/05/13 15:40:16 deraadt Exp $     */
       2             : 
       3             : /*
       4             :  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
       5             :  * All rights reserved.
       6             :  *
       7             :  * Redistribution and use in source and binary forms, with or without
       8             :  * modification, are permitted provided that the following conditions
       9             :  * are met:
      10             :  * 1. Redistributions of source code must retain the above copyright
      11             :  *    notice, this list of conditions and the following disclaimer.
      12             :  * 2. Redistributions in binary form must reproduce the above copyright
      13             :  *    notice, this list of conditions and the following disclaimer in the
      14             :  *    documentation and/or other materials provided with the distribution.
      15             :  * 3. The name of the author may not be used to endorse or promote products
      16             :  *    derived from this software without specific prior written permission.
      17             :  *
      18             :  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
      19             :  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
      20             :  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
      21             :  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
      22             :  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
      23             :  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
      24             :  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
      25             :  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
      26             :  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
      27             :  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
      28             :  */
      29             : 
      30             : #if defined(LIBC_SCCS) && !defined(lint)
      31             : static char *rcsid = "$OpenBSD: strlcpy.c,v 1.5 2001/05/13 15:40:16 deraadt Exp $";
      32             : #endif /* LIBC_SCCS and not lint */
      33             : 
      34             : #include "event2/event-config.h"
      35             : #include "evconfig-private.h"
      36             : 
      37             : #include <sys/types.h>
      38             : 
      39             : #ifndef EVENT__HAVE_STRLCPY
      40             : #include "strlcpy-internal.h"
      41             : 
      42             : /*
      43             :  * Copy src to string dst of size siz.  At most siz-1 characters
      44             :  * will be copied.  Always NUL terminates (unless siz == 0).
      45             :  * Returns strlen(src); if retval >= siz, truncation occurred.
      46             :  */
      47             : size_t
      48           0 : event_strlcpy_(dst, src, siz)
      49             :         char *dst;
      50             :         const char *src;
      51             :         size_t siz;
      52             : {
      53           0 :         register char *d = dst;
      54           0 :         register const char *s = src;
      55           0 :         register size_t n = siz;
      56             : 
      57             :         /* Copy as many bytes as will fit */
      58           0 :         if (n != 0 && --n != 0) {
      59             :                 do {
      60           0 :                         if ((*d++ = *s++) == 0)
      61           0 :                                 break;
      62           0 :                 } while (--n != 0);
      63             :         }
      64             : 
      65             :         /* Not enough room in dst, add NUL and traverse rest of src */
      66           0 :         if (n == 0) {
      67           0 :                 if (siz != 0)
      68           0 :                         *d = '\0';              /* NUL-terminate dst */
      69           0 :                 while (*s++)
      70             :                         ;
      71             :         }
      72             : 
      73           0 :         return (s - src - 1);   /* count does not include NUL */
      74             : }
      75             : #endif