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  1. /*      $OpenBSD: strlcat.c,v 1.8 2001/05/13 15:40:15 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: strlcat.c,v 1.8 2001/05/13 15:40:15 deraadt Exp $";
  32. #endif /* LIBC_SCCS and not lint */
  33.  
  34. #include <sys/types.h>
  35. #include <string.h>
  36.  
  37. /*
  38.  * Appends src to string dst of size siz (unlike strncat, siz is the
  39.  * full size of dst, not space left).  At most siz-1 characters
  40.  * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
  41.  * Returns strlen(src) + MIN(siz, strlen(initial dst)).
  42.  * If retval >= siz, truncation occurred.
  43.  */
  44. size_t
  45. _DEFUN (strlcat, (dst, src, siz),
  46.         char *dst _AND
  47.         _CONST char *src _AND
  48.         size_t siz)
  49. {
  50.         register char *d = dst;
  51.         register const char *s = src;
  52.         register size_t n = siz;
  53.         size_t dlen;
  54.  
  55.         /* Find the end of dst and adjust bytes left but don't go past end */
  56.         while (n-- != 0 && *d != '\0')
  57.                 d++;
  58.         dlen = d - dst;
  59.         n = siz - dlen;
  60.  
  61.         if (n == 0)
  62.                 return(dlen + strlen(s));
  63.         while (*s != '\0') {
  64.                 if (n != 1) {
  65.                         *d++ = *s;
  66.                         n--;
  67.                 }
  68.                 s++;
  69.         }
  70.         *d = '\0';
  71.  
  72.         return(dlen + (s - src));        /* count does not include NUL */
  73. }
  74.  
  75.