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Annotation of kernel/machdep/i386/checksum_16.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: #import <sys/types.h>
        !            26: #import <architecture/byte_order.h>
        !            27: 
        !            28: #define        ADDCARRY(x)  (x > 65535 ? x -= 65535 : x)
        !            29: #define        REDUCE {l_util.l = sum; sum = l_util.s[0] + l_util.s[1]; ADDCARRY(sum);}
        !            30: 
        !            31: u_short checksum_16 (wp, shorts)
        !            32:        u_short *wp;
        !            33: {
        !            34:        int sum = 0;
        !            35:        union {
        !            36:                u_short s[2];
        !            37:                long    l;
        !            38:        } l_util;
        !            39: 
        !            40:        while (shorts--)
        !            41:                sum += NXSwapShort(*wp++);
        !            42:        REDUCE;
        !            43:        return (sum);
        !            44: }

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