1: /*      $OpenBSD: strlcpy.c,v 1.4 1999/05/01 18:56:41 millert 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 1.4 1999/05/01 18:56:41 millert Exp $";
   32: #endif /* LIBC_SCCS and not lint */
   33: 
   34: #include <sys/types.h>
   35: #include <string.h>
   36: 
   37: #ifndef HAVE_strlcpy
   38: /*
   39:  * Copy src to string dst of size siz.  At most siz-1 characters
   40:  * will be copied.  Always NUL terminates (unless siz == 0).
   41:  * Returns strlen(src); if retval >= siz, truncation occurred.
   42:  */
   43: size_t strlcpy(dst, src, siz)
   44:         char *dst;
   45:         const char *src;
   46:         size_t siz;
   47: {
   48:         register char *d = dst;
   49:         register const char *s = src;
   50:         register size_t n = siz;
   51: 
   52:         /* Copy as many bytes as will fit */
   53:         if (n != 0 && --n != 0) {
   54:                 do {
   55:                         if ((*d++ = *s++) == 0)
   56:                                 break;
   57:                 } while (--n != 0);
   58:         }
   59: 
   60:         /* Not enough room in dst, add NUL and traverse rest of src */
   61:         if (n == 0) {
   62:                 if (siz != 0)
   63:                         *d = '\0';           /* NUL-terminate dst */
   64:                 while (*s++)
   65:                         ;
   66:         }
   67: 
   68:         return(s - src - 1);   /* count does not include NUL */
   69: }
   70: #endif