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/*

FUNCTION

        <<wcslcat>>---concatenate wide-character strings to specified length

ANSI_SYNOPSIS

        #include <wchar.h>

        size_t wcslcat(wchar_t *<[dst]>, const wchar_t *<[src]>, size_t <[siz]>);

TRAD_SYNOPSIS

        #include <wchar.h>

        size_t wcslcat(<[dst]>, <[src]>, <[siz]>

        wchar_t *<[dst]>;

        const wchar_t *<[src]>;

        size_t <[siz]>;

DESCRIPTION

        The <<wcslcat>> function appends wide characters from <[src]> to

        end of the <[dst]> wide-character string so that the resultant

        wide-character string is not more than <[siz]> wide characters

        including the terminating null wide-character code.  A terminating

        null wide character is always added unless <[siz]> is 0.  Thus,

        the maximum number of wide characters that can be appended from

        <[src]> is <[siz]> - 1. If copying takes place between objects

        that overlap, the behaviour is undefined.

RETURNS

        Wide-character string length of initial <[dst]> plus the

        wide-character string length of <[src]> (does not include

        terminating null wide-characters).  If the return value is

        greater than or equal to <[siz]>, then truncation occurred and

        not all wide characters from <[src]> were appended.

PORTABILITY

No supporting OS subroutines are required.

*/

/*      $NetBSD: wcslcat.c,v 1.1 2000/12/23 23:14:36 itojun Exp $       */

/*      from OpenBSD: strlcat.c,v 1.3 2000/11/24 11:10:02 itojun Exp    */

/*

 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. The name of the author may not be used to endorse or promote products

 *    derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,

 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY

 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL

 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;

 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,

 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR

 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF

 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#include <_ansi.h>

#include <wchar.h>

/*

 * Appends src to string dst of size siz (unlike wcsncat, siz is the

 * full size of dst, not space left).  At most siz-1 characters

 * will be copied.  Always NUL terminates (unless siz == 0).

 * Returns wcslen(initial dst) + wcslen(src); if retval >= siz,

 * truncation occurred.

 */

size_t

_DEFUN (wcslcat, (dst, src, siz),

        wchar_t * dst _AND

        _CONST wchar_t * src _AND

        size_t siz)

{

  wchar_t *d = dst;

  _CONST wchar_t *s = src;

  size_t n = siz;

  size_t dlen;

  /* Find the end of dst and adjust bytes left but don't go past end */

  while (*d != '\0' && n-- != 0)

    d++;

  dlen = d - dst;

  n = siz - dlen;

  if (n == 0)

    return (dlen + wcslen (s));

  while (*s != '\0')

    {

      if (n != 1)

        {

          *d++ = *s;

          n--;

        }

      s++;

    }

  *d = '\0';

  return (dlen + (s - src));    /* count does not include NUL */

}