Line data    Source code

       1             : /*      $OpenBSD: strlcpy.c,v 1.2 1998/11/06 04:33:16 wvdputte 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 1.2 1998/11/06 04:33:16 wvdputte Exp $";
      32             : #endif /* LIBC_SCCS and not lint */
      33             : 
      34             : #include <sys/types.h>
      35             : #include <string.h>
      36             : 
      37             : /*
      38             :  * Copy src to string dst of size siz.  At most siz-1 characters
      39             :  * will be copied.  Always NUL terminates (unless siz == 0).
      40             :  * Returns strlen(src); if retval >= siz, truncation occurred.
      41             :  */
      42       15759 : size_t strlcpy(char *dst, const char *src, size_t siz)
      43             : {
      44       15759 :         register char *d = dst;
      45       15759 :         register const char *s = src;
      46       15759 :         register size_t n = siz;
      47             : 
      48       15759 :         if (n == 0)
      49           1 :                 return(strlen(s));
      50      241957 :         while (*s != '\0') {
      51      226199 :                 if (n != 1) {
      52      224364 :                         *d++ = *s;
      53      224364 :                         n--;
      54             :                 }
      55      226199 :                 s++;
      56             :         }
      57       15758 :         *d = '\0';
      58             : 
      59       15758 :         return(s - src);        /* count does not include NUL */
      60             : }