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/*

FUNCTION

        <<wcsstr>>---find a wide-character substring

ANSI_SYNOPSIS

        #include <wchar.h>

        wchar_t *wcsstr(const wchar_t *<[big]>, const wchar_t *<[little]>);

TRAD_SYNOPSIS

        wchar_t *wcsstr(<[big]>, <[little]>

        const wchar_t *<[big]>;

        const wchar_t *<[little]>;

DESCRIPTION

        The <<wcsstr>> function locates the first occurrence in the

        wide-character string pointed to by <[big]> of the sequence of

        wide characters (excluding the terminating null wide character) in the

        wide-character string pointed to by <[little]>.

RETURNS

        On successful completion, <<wcsstr>> returns a pointer to the located

        wide-character string, or a null pointer if the wide-character string

        is not found.

        If <[little]> points to a wide-character string with zero length,

        the function returns <[big]>.

PORTABILITY

<<wcsstr>> is ISO/IEC 9899/AMD1:1995 (ISO C).

*/

/*      $NetBSD: wcsstr.c,v 1.1 2000/12/23 23:14:37 itojun Exp $        */

/*-

 * Copyright (c)1999 Citrus Project,

 * 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.

 *

 * 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.

 *

 *      citrus Id: wcsstr.c,v 1.2 2000/12/21 05:07:25 itojun Exp

 */

#include <_ansi.h>

#include <stddef.h>

#include <wchar.h>

wchar_t *

_DEFUN (wcsstr, (big, little),

        _CONST wchar_t * big _AND

        _CONST wchar_t * little)

{

  _CONST wchar_t *p;

  _CONST wchar_t *q;

  _CONST wchar_t *r;

  if (!*little)

    {

      /* LINTED interface specification */

      return (wchar_t *) big;

    }

  if (wcslen (big) < wcslen (little))

    return NULL;

  p = big;

  q = little;

  while (*p)

    {

      q = little;

      r = p;

      while (*q)

        {

          if (*r != *q)

            break;

          q++;

          r++;

        }

      if (!*q)

        {

          /* LINTED interface specification */

          return (wchar_t *) p;

        }

      p++;

    }

  return NULL;

}