Return to endian.h CVS log

Up to [Apple XNU] / XNU / osfmk / i386

Annotation of XNU/osfmk/i386/endian.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * @OSF_COPYRIGHT@
        !            24:  * 
        !            25:  */
        !            26: 
        !            27: #ifndef _MACHINE_ENDIAN_H_
        !            28: #define _MACHINE_ENDIAN_H_
        !            29: 
        !            30: /*
        !            31:  * Definitions for byte order,
        !            32:  * according to byte significance from low address to high.
        !            33:  */
        !            34: #define        LITTLE_ENDIAN   1234    /* least-significant byte first (vax) */
        !            35: #define        BIG_ENDIAN      4321    /* most-significant byte first (IBM, net) */
        !            36: #define        PDP_ENDIAN      3412    /* LSB first in word, MSW first in long (pdp) */
        !            37: 
        !            38: #define        BYTE_ORDER      LITTLE_ENDIAN   /* byte order on i386 */
        !            39: #define ENDIAN         LITTLE
        !            40: 
        !            41: /*
        !            42:  * Macros for network/external number representation conversion.
        !            43:  */
        !            44: 
        !            45: unsigned short ntohs(unsigned short), htons(unsigned short);
        !            46: unsigned long  ntohl(unsigned long), htonl(unsigned long);
        !            47: 
        !            48: /*
        !            49:  * Use GNUC support to inline the byteswappers.
        !            50:  */
        !            51: 
        !            52: extern __inline__
        !            53: unsigned short
        !            54: ntohs(unsigned short w_int)
        !            55: {
        !            56:        register unsigned short w = w_int;
        !            57:        __asm__ volatile("xchgb %h1,%b1" : "=q" (w) : "0" (w));
        !            58:        return (w);     /* zero-extend for compat */
        !            59: }
        !            60: 
        !            61: #define        htons   ntohs
        !            62: 
        !            63: extern __inline__
        !            64: unsigned long
        !            65: ntohl(register unsigned long value)
        !            66: {
        !            67:        register unsigned long l = value;
        !            68:        __asm__ volatile("bswap %0" : "=r" (l) : "0" (l));
        !            69:        return l;
        !            70: }
        !            71: 
        !            72: #define htonl  ntohl
        !            73: 
        !            74: #define NTOHL(x)       (x) = ntohl((unsigned long)x)
        !            75: #define NTOHS(x)       (x) = ntohs((unsigned short)x)
        !            76: #define HTONL(x)       (x) = htonl((unsigned long)x)
        !            77: #define HTONS(x)       (x) = htons((unsigned short)x)
        !            78: 
        !            79: #endif

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.