kolibrios/programs/develop/open watcom/trunk/clib/string/strnln_s.c

/****************************************************************************
*
*                            Open Watcom Project
*
*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
*  ========================================================================
*
*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
*    Public License version 1.0 (the 'License'). You may not use this file
*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
*    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
*    provided with the Original Code and Modifications, and is also
*    available at www.sybase.com/developer/opensource.
*
*    The Original Code and all software distributed under the License are
*    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
*    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
*    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
*    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
*    NON-INFRINGEMENT. Please see the License for the specific language
*    governing rights and limitations under the License.
*
*  ========================================================================
*
* Description:  Implementation of strnlen_s() - "safe" strnlen().
*
****************************************************************************/


#include "variety.h"
#include "saferlib.h"
#include "widechar.h"
#include <string.h>
#include <wchar.h>


_WCRTLINK size_t __F_NAME(strnlen_s,wcsnlen_s)( const CHAR_TYPE *s, size_t maxsize )
/**********************************************************************************/
{
    size_t  m = 0;

    // ensure the pointer is not NULL
    if( s != NULL ) {
        // count chars up to '\0' or maxsize
        while( *(s + m) != NULLCHAR  &&  m < maxsize )
            ++m;
    }
    return( m );
}