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  1. /*
  2. FUNCTION
  3.         <<wcslcat>>---concatenate wide-character strings to specified length
  4.  
  5. ANSI_SYNOPSIS
  6.         #include <wchar.h>
  7.         size_t wcslcat(wchar_t *<[dst]>, const wchar_t *<[src]>, size_t <[siz]>);
  8.  
  9. TRAD_SYNOPSIS
  10.         #include <wchar.h>
  11.         size_t wcslcat(<[dst]>, <[src]>, <[siz]>
  12.         wchar_t *<[dst]>;
  13.         const wchar_t *<[src]>;
  14.         size_t <[siz]>;
  15.  
  16. DESCRIPTION
  17.         The <<wcslcat>> function appends wide characters from <[src]> to
  18.         end of the <[dst]> wide-character string so that the resultant
  19.         wide-character string is not more than <[siz]> wide characters
  20.         including the terminating null wide-character code.  A terminating
  21.         null wide character is always added unless <[siz]> is 0.  Thus,
  22.         the maximum number of wide characters that can be appended from
  23.         <[src]> is <[siz]> - 1. If copying takes place between objects
  24.         that overlap, the behaviour is undefined.
  25.  
  26. RETURNS
  27.         Wide-character string length of initial <[dst]> plus the
  28.         wide-character string length of <[src]> (does not include
  29.         terminating null wide-characters).  If the return value is
  30.         greater than or equal to <[siz]>, then truncation occurred and
  31.         not all wide characters from <[src]> were appended.
  32.  
  33. PORTABILITY
  34. No supporting OS subroutines are required.
  35. */
  36.  
  37. /*      $NetBSD: wcslcat.c,v 1.1 2000/12/23 23:14:36 itojun Exp $       */
  38. /*      from OpenBSD: strlcat.c,v 1.3 2000/11/24 11:10:02 itojun Exp    */
  39.  
  40. /*
  41.  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
  42.  * All rights reserved.
  43.  *
  44.  * Redistribution and use in source and binary forms, with or without
  45.  * modification, are permitted provided that the following conditions
  46.  * are met:
  47.  * 1. Redistributions of source code must retain the above copyright
  48.  *    notice, this list of conditions and the following disclaimer.
  49.  * 2. Redistributions in binary form must reproduce the above copyright
  50.  *    notice, this list of conditions and the following disclaimer in the
  51.  *    documentation and/or other materials provided with the distribution.
  52.  * 3. The name of the author may not be used to endorse or promote products
  53.  *    derived from this software without specific prior written permission.
  54.  *
  55.  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
  56.  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
  57.  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
  58.  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  59.  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  60.  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  61.  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  62.  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  63.  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  64.  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  65.  */
  66.  
  67. #include <_ansi.h>
  68. #include <wchar.h>
  69.  
  70. /*
  71.  * Appends src to string dst of size siz (unlike wcsncat, siz is the
  72.  * full size of dst, not space left).  At most siz-1 characters
  73.  * will be copied.  Always NUL terminates (unless siz == 0).
  74.  * Returns wcslen(initial dst) + wcslen(src); if retval >= siz,
  75.  * truncation occurred.
  76.  */
  77. size_t
  78. _DEFUN (wcslcat, (dst, src, siz),
  79.         wchar_t * dst _AND
  80.         _CONST wchar_t * src _AND
  81.         size_t siz)
  82. {
  83.   wchar_t *d = dst;
  84.   _CONST wchar_t *s = src;
  85.   size_t n = siz;
  86.   size_t dlen;
  87.  
  88.   /* Find the end of dst and adjust bytes left but don't go past end */
  89.   while (*d != '\0' && n-- != 0)
  90.     d++;
  91.   dlen = d - dst;
  92.   n = siz - dlen;
  93.  
  94.   if (n == 0)
  95.     return (dlen + wcslen (s));
  96.   while (*s != '\0')
  97.     {
  98.       if (n != 1)
  99.         {
  100.           *d++ = *s;
  101.           n--;
  102.         }
  103.       s++;
  104.     }
  105.   *d = '\0';
  106.  
  107.   return (dlen + (s - src));    /* count does not include NUL */
  108. }
  109.