Subversion Repositories openrisc_2011-10-31

/*

FUNCTION

        <<wcsncmp>>---compare part of two wide-character strings

ANSI_SYNOPSIS

        #include <wchar.h>

        int wcsncmp(const wchar_t *<[s1]>, const wchar_t *<[s2]>, size_t <[n]>);

TRAD_SYNOPSIS

        int wcsncmp(<[s1]>, <[s2]>, <[n]>

        const wchar_t *<[s1]>;

        const wchar_t *<[s2]>;

        size_t <[n]>;

DESCRIPTION

        The <<wcsncmp>> function compares not more than <[n]> wide-character

        codes (wide-character codes that follow a null wide-character code are

        not compared) from the array pointed to by <[s1]> to the array pointed

        to by <[s2]>.

        The sign of a non-zero return value is determined by the sign of the

        difference between the values of the first pair of wide-character codes

        that differ in the objects being compared.

RETURNS

        Upon successful completion, <<wcsncmp>> returns an integer greater than,

        equal to or less than 0, if the possibly null-terminated array pointed

        to by <[s1]> is greater than, equal to or less than the possibly

        null-terminated array pointed to by <[s2]> respectively.

PORTABILITY

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

No supporting OS subroutines are required.

*/

/*      $NetBSD$        */

/*

 * Copyright (c) 1989, 1993

 *      The Regents of the University of California.  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. Neither the name of the University nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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 <wchar.h>

int

_DEFUN (wcsncmp, (s1, s2, n),

        _CONST wchar_t * s1 _AND

        _CONST wchar_t * s2 _AND

        size_t n)

{

  if (n == 0)

    return (0);

  do

    {

      if (*s1 != *s2++)

        {

          return (*s1 - *--s2);

        }

      if (*s1++ == 0)

        break;

    }

  while (--n != 0);

  return (0);

}