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  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 <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. size_t
  43. _DEFUN (strlcpy, (dst, src, siz),
  44.         char *dst _AND
  45.         _CONST char *src _AND
  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.  
  71.