FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/include/os/freebsd/spl/sys/byteorder.h

     /*
      * CDDL HEADER START
      *
      * The contents of this file are subject to the terms of the
      * Common Development and Distribution License (the "License").
      * You may not use this file except in compliance with the License.
      *
      * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      * or https://opensource.org/licenses/CDDL-1.0.
     * See the License for the specific language governing permissions
     * and limitations under the License.
     *
     * When distributing Covered Code, include this CDDL HEADER in each
     * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     * If applicable, add the following below this CDDL HEADER, with the
     * fields enclosed by brackets "[]" replaced with your own identifying
     * information: Portions Copyright [yyyy] [name of copyright owner]
     *
     * CDDL HEADER END
     *
     * $FreeBSD$
     */
    
    /*
     * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
     * Use is subject to license terms.
     */
    
    /*      Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T     */
    /*        All Rights Reserved   */
    
    /*
     * University Copyright- Copyright (c) 1982, 1986, 1988
     * The Regents of the University of California
     * All Rights Reserved
     *
     * University Acknowledgment- Portions of this document are derived from
     * software developed by the University of California, Berkeley, and its
     * contributors.
     */
    
    #ifndef _OPENSOLARIS_SYS_BYTEORDER_H_
    #define _OPENSOLARIS_SYS_BYTEORDER_H_
    
    #include <sys/endian.h>
    
    #ifdef __COVERITY__
    /*
     * Coverity's taint warnings from byteswapping are false positives for us.
     * Suppress them by hiding byteswapping from Coverity.
     */
    #define BSWAP_8(x)      ((x) & 0xff)
    #define BSWAP_16(x)     ((x) & 0xffff)
    #define BSWAP_32(x)     ((x) & 0xffffffff)
    #define BSWAP_64(x)     (x)
    
    #else /* __COVERITY__ */
    
    /*
     * Macros to reverse byte order
     */
    #define BSWAP_8(x)      ((x) & 0xff)
    #define BSWAP_16(x)     ((BSWAP_8(x) << 8) | BSWAP_8((x) >> 8))
    #define BSWAP_32(x)     ((BSWAP_16(x) << 16) | BSWAP_16((x) >> 16))
    #define BSWAP_64(x)     ((BSWAP_32(x) << 32) | BSWAP_32((x) >> 32))
    
    #endif /* __COVERITY__ */
    
    #define BMASK_8(x)      ((x) & 0xff)
    #define BMASK_16(x)     ((x) & 0xffff)
    #define BMASK_32(x)     ((x) & 0xffffffff)
    #define BMASK_64(x)     (x)
    
    /*
     * Macros to convert from a specific byte order to/from native byte order
     */
    #if BYTE_ORDER == _BIG_ENDIAN
    #define BE_8(x)         BMASK_8(x)
    #define BE_16(x)        BMASK_16(x)
    #define BE_32(x)        BMASK_32(x)
    #define BE_64(x)        BMASK_64(x)
    #define LE_8(x)         BSWAP_8(x)
    #define LE_16(x)        BSWAP_16(x)
    #define LE_32(x)        BSWAP_32(x)
    #define LE_64(x)        BSWAP_64(x)
    #else
    #define LE_8(x)         BMASK_8(x)
    #define LE_16(x)        BMASK_16(x)
    #define LE_32(x)        BMASK_32(x)
    #define LE_64(x)        BMASK_64(x)
    #define BE_8(x)         BSWAP_8(x)
    #define BE_16(x)        BSWAP_16(x)
    #define BE_32(x)        BSWAP_32(x)
    #define BE_64(x)        BSWAP_64(x)
    #endif
    
    #if !defined(_STANDALONE)
    #if BYTE_ORDER == _BIG_ENDIAN
    #define htonll(x)       BMASK_64(x)
   #define ntohll(x)       BMASK_64(x)
   #else /* BYTE_ORDER == _LITTLE_ENDIAN */
   #ifndef __LP64__
   static __inline__ uint64_t
   htonll(uint64_t n)
   {
           return ((((uint64_t)htonl(n)) << 32) + htonl(n >> 32));
   }
   
   static __inline__ uint64_t
   ntohll(uint64_t n)
   {
           return ((((uint64_t)ntohl(n)) << 32) + ntohl(n >> 32));
   }
   #else   /* !__LP64__ */
   #define htonll(x)       BSWAP_64(x)
   #define ntohll(x)       BSWAP_64(x)
   #endif  /* __LP64__ */
   #endif  /* BYTE_ORDER */
   #endif  /* _STANDALONE */
   
   #define BE_IN32(xa)     htonl(*((uint32_t *)(void *)(xa)))
   
   #endif /* _OPENSOLARIS_SYS_BYTEORDER_H_ */

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