FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/lib/libspl/include/os/linux/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
     */
    
    /*
     * Copyright 2007 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 _SYS_BYTEORDER_H
    #define _SYS_BYTEORDER_H
    
    #if defined(__GNUC__) && defined(_ASM_INLINES) && \
            (defined(__i386) || defined(__amd64))
    #include <asm/byteorder.h>
    #endif
    
    #include <sys/isa_defs.h>
    #include <inttypes.h>
    
    #ifdef  __cplusplus
    extern "C" {
    #endif
    
    /*
     * macros for conversion between host and (internet) network byte order
     */
    
    #if defined(_ZFS_BIG_ENDIAN) && !defined(ntohl) && !defined(__lint)
    /* big-endian */
    #define ntohl(x)        (x)
    #define ntohs(x)        (x)
    #define htonl(x)        (x)
    #define htons(x)        (x)
    
    #elif !defined(ntohl) /* little-endian */
    
    #ifndef _IN_PORT_T
    #define _IN_PORT_T
    typedef uint16_t in_port_t;
    #endif
    
    #ifndef _IN_ADDR_T
    #define _IN_ADDR_T
    typedef uint32_t in_addr_t;
    #endif
    
    #if !defined(_XPG4_2) || defined(__EXTENSIONS__) || defined(_XPG5)
    extern  uint32_t htonl(uint32_t);
    extern  uint16_t htons(uint16_t);
    extern  uint32_t ntohl(uint32_t);
    extern  uint16_t ntohs(uint16_t);
    #else
    extern  in_addr_t htonl(in_addr_t);
    extern  in_port_t htons(in_port_t);
    extern  in_addr_t ntohl(in_addr_t);
    extern  in_port_t ntohs(in_port_t);
    #endif  /* !defined(_XPG4_2) || defined(__EXTENSIONS__) || defined(_XPG5) */
    #endif
    
    #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
    
    #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
    */
   #ifdef _ZFS_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
   
   #ifdef _ZFS_BIG_ENDIAN
   static __inline__ uint64_t
   htonll(uint64_t n)
   {
           return (n);
   }
   
   static __inline__ uint64_t
   ntohll(uint64_t n)
   {
           return (n);
   }
   #else
   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));
   }
   #endif
   
   /*
    * Macros to read unaligned values from a specific byte order to
    * native byte order
    */
   
   #define BE_IN8(xa) \
           *((uint8_t *)(xa))
   
   #define BE_IN16(xa) \
           (((uint16_t)BE_IN8(xa) << 8) | BE_IN8((uint8_t *)(xa)+1))
   
   #define BE_IN32(xa) \
           (((uint32_t)BE_IN16(xa) << 16) | BE_IN16((uint8_t *)(xa)+2))
   
   #define BE_IN64(xa) \
           (((uint64_t)BE_IN32(xa) << 32) | BE_IN32((uint8_t *)(xa)+4))
   
   #define LE_IN8(xa) \
           *((uint8_t *)(xa))
   
   #define LE_IN16(xa) \
           (((uint16_t)LE_IN8((uint8_t *)(xa) + 1) << 8) | LE_IN8(xa))
   
   #define LE_IN32(xa) \
           (((uint32_t)LE_IN16((uint8_t *)(xa) + 2) << 16) | LE_IN16(xa))
   
   #define LE_IN64(xa) \
           (((uint64_t)LE_IN32((uint8_t *)(xa) + 4) << 32) | LE_IN32(xa))
   
   /*
    * Macros to write unaligned values from native byte order to a specific byte
    * order.
    */
   
   #define BE_OUT8(xa, yv) *((uint8_t *)(xa)) = (uint8_t)(yv);
   
   #define BE_OUT16(xa, yv) \
           BE_OUT8((uint8_t *)(xa) + 1, yv); \
           BE_OUT8((uint8_t *)(xa), (yv) >> 8);
   
   #define BE_OUT32(xa, yv) \
           BE_OUT16((uint8_t *)(xa) + 2, yv); \
           BE_OUT16((uint8_t *)(xa), (yv) >> 16);
   
   #define BE_OUT64(xa, yv) \
           BE_OUT32((uint8_t *)(xa) + 4, yv); \
           BE_OUT32((uint8_t *)(xa), (yv) >> 32);
   
   #define LE_OUT8(xa, yv) *((uint8_t *)(xa)) = (uint8_t)(yv);
   
   #define LE_OUT16(xa, yv) \
           LE_OUT8((uint8_t *)(xa), yv); \
           LE_OUT8((uint8_t *)(xa) + 1, (yv) >> 8);
   
   #define LE_OUT32(xa, yv) \
           LE_OUT16((uint8_t *)(xa), yv); \
           LE_OUT16((uint8_t *)(xa) + 2, (yv) >> 16);
   
   #define LE_OUT64(xa, yv) \
           LE_OUT32((uint8_t *)(xa), yv); \
           LE_OUT32((uint8_t *)(xa) + 4, (yv) >> 32);
   
   #endif  /* !defined(_XPG4_2) || defined(__EXTENSIONS__) */
   
   #ifdef  __cplusplus
   }
   #endif
   
   #endif /* _SYS_BYTEORDER_H */

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