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/*

FUNCTION

        <<wcsnlen>>---get fixed-size wide-character string length

INDEX

        wcsnlen

ANSI_SYNOPSIS

        #include <wchar.h>

        size_t wcsnlen(const wchar_t *<[s]>, size_t <[maxlen]>);

TRAD_SYNOPSIS

        #include <wchar.h>

        size_t wcsnlen(<[s]>, <[maxlen]>)

        wchar_t *<[s]>;

        size_t <[maxlen]>;

DESCRIPTION

        The <<wcsnlen>> function computes the number of wide-character codes

        in the wide-character string pointed to by <[s]> not including the

        terminating L'\0' wide character but at most <[maxlen]> wide

        characters.

RETURNS

        <<wcsnlen>> returns the length of <[s]> if it is less then <[maxlen]>,

        or <[maxlen]> if there is no L'\0' wide character in first <[maxlen]>

        characters.

PORTABILITY

<<wcsnlen>> is a GNU extension.

<<wcsnlen>> requires no supporting OS subroutines.

*/

/*

 * Copyright (c) 2003, Artem B. Bityuckiy (dedekind@mail.ru).

 *

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

 * modification, are permitted provided that the above copyright notice,

 * this condition statement, and the following disclaimer are retained

 * in any redistributions of the source code.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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 <sys/types.h>

#include <wchar.h>

size_t

_DEFUN(wcsnlen, (s, maxlen),

                 _CONST wchar_t *s _AND

                 size_t maxlen)

{

  _CONST wchar_t *p;

  p = s;

  while (*p && maxlen-- > 0)

    p++;

  return (size_t)(p - s);

}