src/common/strlcpy.c

   1 /* $Id$ */
   2 /*      $OpenBSD: strlcpy.c,v 1.2 1998/11/06 04:33:16 wvdputte 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 1.2 1998/11/06 04:33:16 wvdputte Exp $";
  33 #endif /* LIBC_SCCS and not lint */
  34
  35 #include <sys/types.h>
  36 #include <string.h>
  37
  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         if (n == 0)
  53                 return(strlen(s));
  54         while (*s != '\0') {
  55                 if (n != 1) {
  56                         *d++ = *s;
  57                         n--;
  58                 }
  59                 s++;
  60         }
  61         *d = '\0';
  62
  63         return(s - src);        /* count does not include NUL */
  64 }