Return to byte_order.h CVS log

Up to [Apple XNU] / XNU / EXTERNAL_HEADERS / architecture / i386

Annotation of XNU/EXTERNAL_HEADERS/architecture/i386/byte_order.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:  * Copyright (c) 1992 NeXT Computer, Inc.
        !            24:  *
        !            25:  * Byte ordering conversion (for i386).
        !            26:  *
        !            27:  * HISTORY
        !            28:  *
        !            29:  * 8 October 1992 ? at NeXT
        !            30:  *     Converted to NXxxx versions.  Condensed history.
        !            31:  *
        !            32:  * 18 May 1992 ? at NeXT
        !            33:  *     Created.
        !            34:  */
        !            35:  
        !            36: static __inline__
        !            37: unsigned short
        !            38: NXSwapShort(
        !            39:     unsigned short     inv
        !            40: )
        !            41: {
        !            42:     register unsigned short value = inv;
        !            43:     
        !            44:     __asm__ volatile( "xchgb %h1, %b1" : "=q" (value) : "0" (value));
        !            45: 
        !            46:     return (value);
        !            47: }
        !            48:  
        !            49: static __inline__
        !            50: unsigned long
        !            51: NXSwapInt(
        !            52:     unsigned long inv
        !            53: )
        !            54: {
        !            55:     register unsigned int outv = inv;
        !            56:     
        !            57:     __asm__ volatile( "bswap %0" : "=r"        (outv) : "0" (outv));
        !            58:        
        !            59:     return (outv);
        !            60: }
        !            61:  
        !            62: static __inline__
        !            63: unsigned long
        !            64: NXSwapLong(
        !            65:     unsigned long      inv
        !            66: )
        !            67: {
        !            68:     unsigned long      outv;
        !            69:     
        !            70:     __asm__ volatile(
        !            71:        "bswap %0"
        !            72:        
        !            73:        : "=r"  (outv)
        !            74:        : "0"   (inv));
        !            75:        
        !            76:     return (outv);
        !            77: }
        !            78: 
        !            79: static __inline__
        !            80: unsigned long long
        !            81: NXSwapLongLong(
        !            82:     unsigned long long inv
        !            83: )
        !            84: {
        !            85:     union llconv {
        !            86:        unsigned long long      ull;
        !            87:        unsigned long           ul[2];
        !            88:     } *inp, outv;
        !            89:     
        !            90:     inp = (union llconv *)&inv;
        !            91:     
        !            92:     outv.ul[0] = NXSwapLong(inp->ul[1]);
        !            93:     outv.ul[1] = NXSwapLong(inp->ul[0]);
        !            94:        
        !            95:     return (outv.ull);
        !            96: }
        !            97: 
        !            98: static __inline__ NXSwappedFloat
        !            99: NXConvertHostFloatToSwapped(float x)
        !           100: {
        !           101:     union fconv {
        !           102:        float number;
        !           103:        NXSwappedFloat sf;
        !           104:     };
        !           105:     return ((union fconv *)&x)->sf;
        !           106: }
        !           107: 
        !           108: static __inline__ float
        !           109: NXConvertSwappedFloatToHost(NXSwappedFloat x)
        !           110: {
        !           111:     union fconv {
        !           112:        float number;
        !           113:        NXSwappedFloat sf;
        !           114:     };
        !           115:     return ((union fconv *)&x)->number;
        !           116: }
        !           117: 
        !           118: static __inline__ NXSwappedDouble
        !           119: NXConvertHostDoubleToSwapped(double x)
        !           120: {
        !           121:     union dconv {
        !           122:        double number;
        !           123:        NXSwappedDouble sd;
        !           124:     };
        !           125:     return ((union dconv *)&x)->sd;
        !           126: }
        !           127: 
        !           128: static __inline__ double
        !           129: NXConvertSwappedDoubleToHost(NXSwappedDouble x)
        !           130: {
        !           131:     union dconv {
        !           132:        double number;
        !           133:        NXSwappedDouble sd;
        !           134:     };
        !           135:     return ((union dconv *)&x)->number;
        !           136: }
        !           137: 
        !           138: static __inline__ NXSwappedFloat
        !           139: NXSwapFloat(NXSwappedFloat x)
        !           140: {
        !           141:     return NXSwapLong(x);
        !           142: }
        !           143: 
        !           144: static __inline__ NXSwappedDouble
        !           145: NXSwapDouble(NXSwappedDouble x)
        !           146: {
        !           147:     return NXSwapLongLong(x);
        !           148: }

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