FreeBSD/Linux Kernel Cross Reference
sys/sys/endian.h

     /*      $NetBSD: endian.h,v 1.24 2006/05/05 15:08:11 christos Exp $     */
     
     /*
      * Copyright (c) 1987, 1991, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)endian.h    8.1 (Berkeley) 6/11/93
     */
    
    #ifndef _SYS_ENDIAN_H_
    #define _SYS_ENDIAN_H_
    
    #include <sys/featuretest.h>
    
    /*
     * Definitions for byte order, according to byte significance from low
     * address to high.
     */
    #define _LITTLE_ENDIAN  1234    /* LSB first: i386, vax */
    #define _BIG_ENDIAN     4321    /* MSB first: 68000, ibm, net */
    #define _PDP_ENDIAN     3412    /* LSB first in word, MSW first in long */
    
    
    #if defined(_XOPEN_SOURCE) || defined(_NETBSD_SOURCE)
    #ifndef _LOCORE
    
    /* C-family endian-ness definitions */
    
    #include <sys/ansi.h>
    #include <sys/cdefs.h>
    #include <sys/types.h>
    
    #ifndef in_addr_t
    typedef __in_addr_t     in_addr_t;
    #define in_addr_t       __in_addr_t
    #endif
    
    #ifndef in_port_t
    typedef __in_port_t     in_port_t;
    #define in_port_t       __in_port_t
    #endif
    
    __BEGIN_DECLS
    uint32_t htonl(uint32_t) __attribute__((__const__));
    uint16_t htons(uint16_t) __attribute__((__const__));
    uint32_t ntohl(uint32_t) __attribute__((__const__));
    uint16_t ntohs(uint16_t) __attribute__((__const__));
    __END_DECLS
    
    #endif /* !_LOCORE */
    #endif /* _XOPEN_SOURCE || _NETBSD_SOURCE */
    
    
    #include <machine/endian_machdep.h>
    
    /*
     * Define the order of 32-bit words in 64-bit words.
     */
    #if _BYTE_ORDER == _LITTLE_ENDIAN
    #define _QUAD_HIGHWORD 1
    #define _QUAD_LOWWORD 0
    #endif
    
    #if _BYTE_ORDER == _BIG_ENDIAN
    #define _QUAD_HIGHWORD 0
    #define _QUAD_LOWWORD 1
    #endif
    
    
    #if defined(_XOPEN_SOURCE) || defined(_NETBSD_SOURCE)
    /*
     *  Traditional names for byteorder.  These are defined as the numeric
     *  sequences so that third party code can "#define XXX_ENDIAN" and not
     *  cause errors.
     */
   #define LITTLE_ENDIAN   1234            /* LSB first: i386, vax */
   #define BIG_ENDIAN      4321            /* MSB first: 68000, ibm, net */
   #define PDP_ENDIAN      3412            /* LSB first in word, MSW first in long */
   #define BYTE_ORDER      _BYTE_ORDER
   
   #ifndef _LOCORE
   
   #include <machine/bswap.h>
   
   /*
    * Macros for network/external number representation conversion.
    */
   #if BYTE_ORDER == BIG_ENDIAN && !defined(__lint__)
   #define ntohl(x)        (x)
   #define ntohs(x)        (x)
   #define htonl(x)        (x)
   #define htons(x)        (x)
   
   #define NTOHL(x)        (void) (x)
   #define NTOHS(x)        (void) (x)
   #define HTONL(x)        (void) (x)
   #define HTONS(x)        (void) (x)
   
   #else   /* LITTLE_ENDIAN || !defined(__lint__) */
   
   #define ntohl(x)        bswap32((uint32_t)(x))
   #define ntohs(x)        bswap16((uint16_t)(x))
   #define htonl(x)        bswap32((uint32_t)(x))
   #define htons(x)        bswap16((uint16_t)(x))
   
   #define NTOHL(x)        (x) = ntohl((uint32_t)(x))
   #define NTOHS(x)        (x) = ntohs((uint16_t)(x))
   #define HTONL(x)        (x) = htonl((uint32_t)(x))
   #define HTONS(x)        (x) = htons((uint16_t)(x))
   #endif  /* LITTLE_ENDIAN || !defined(__lint__) */
   
   /*
    * Macros to convert to a specific endianness.
    */
   
   #if BYTE_ORDER == BIG_ENDIAN
   
   #define htobe16(x)      (x)
   #define htobe32(x)      (x)
   #define htobe64(x)      (x)
   #define htole16(x)      bswap16((uint16_t)(x))
   #define htole32(x)      bswap32((uint32_t)(x))
   #define htole64(x)      bswap64((uint64_t)(x))
   
   #define HTOBE16(x)      (void) (x)
   #define HTOBE32(x)      (void) (x)
   #define HTOBE64(x)      (void) (x)
   #define HTOLE16(x)      (x) = bswap16((uint16_t)(x))
   #define HTOLE32(x)      (x) = bswap32((uint32_t)(x))
   #define HTOLE64(x)      (x) = bswap64((uint64_t)(x))
   
   #else   /* LITTLE_ENDIAN */
   
   #define htobe16(x)      bswap16((uint16_t)(x))
   #define htobe32(x)      bswap32((uint32_t)(x))
   #define htobe64(x)      bswap64((uint64_t)(x))
   #define htole16(x)      (x)
   #define htole32(x)      (x)
   #define htole64(x)      (x)
   
   #define HTOBE16(x)      (x) = bswap16((uint16_t)(x))
   #define HTOBE32(x)      (x) = bswap32((uint32_t)(x))
   #define HTOBE64(x)      (x) = bswap64((uint64_t)(x))
   #define HTOLE16(x)      (void) (x)
   #define HTOLE32(x)      (void) (x)
   #define HTOLE64(x)      (void) (x)
   
   #endif  /* LITTLE_ENDIAN */
   
   #define be16toh(x)      htobe16(x)
   #define be32toh(x)      htobe32(x)
   #define be64toh(x)      htobe64(x)
   #define le16toh(x)      htole16(x)
   #define le32toh(x)      htole32(x)
   #define le64toh(x)      htole64(x)
   
   #define BE16TOH(x)      HTOBE16(x)
   #define BE32TOH(x)      HTOBE32(x)
   #define BE64TOH(x)      HTOBE64(x)
   #define LE16TOH(x)      HTOLE16(x)
   #define LE32TOH(x)      HTOLE32(x)
   #define LE64TOH(x)      HTOLE64(x)
   
   /*
    * Routines to encode/decode big- and little-endian multi-octet values
    * to/from an octet stream.
    */
   
   static __inline void __unused
   be16enc(void *buf, uint16_t u)
   {
           uint8_t *p = (uint8_t *)buf;
   
           p[0] = ((unsigned)u >> 8) & 0xff;
           p[1] = u & 0xff;
   }
   
   static __inline void __unused
   le16enc(void *buf, uint16_t u)
   {
           uint8_t *p = (uint8_t *)buf;
   
           p[0] = u & 0xff;
           p[1] = ((unsigned)u >> 8) & 0xff;
   }
   
   static __inline uint16_t __unused
   be16dec(const void *buf)
   {
           const uint8_t *p = (const uint8_t *)buf;
   
           return ((p[0] << 8) | p[1]);
   }
   
   static __inline uint16_t __unused
   le16dec(const void *buf)
   {
           const uint8_t *p = (const uint8_t *)buf;
   
           return ((p[1] << 8) | p[0]);
   }
   
   static __inline void __unused
   be32enc(void *buf, uint32_t u)
   {
           uint8_t *p = (uint8_t *)buf;
   
           p[0] = (u >> 24) & 0xff;
           p[1] = (u >> 16) & 0xff;
           p[2] = (u >> 8) & 0xff;
           p[3] = u & 0xff;
   }
   
   static __inline void __unused
   le32enc(void *buf, uint32_t u)
   {
           uint8_t *p = (uint8_t *)buf;
   
           p[0] = u & 0xff;
           p[1] = (u >> 8) & 0xff;
           p[2] = (u >> 16) & 0xff;
           p[3] = (u >> 24) & 0xff;
   }
   
   static __inline uint32_t __unused
   be32dec(const void *buf)
   {
           const uint8_t *p = (const uint8_t *)buf;
   
           return ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
   }
   
   static __inline uint32_t __unused
   le32dec(const void *buf)
   {
           const uint8_t *p = (const uint8_t *)buf;
   
           return ((p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
   }
   
   static __inline void __unused
   be64enc(void *buf, uint64_t u)
   {
           uint8_t *p = (uint8_t *)buf;
   
           be32enc(p, (uint32_t)(u >> 32));
           be32enc(p + 4, (uint32_t)(u & 0xffffffffULL));
   }
   
   static __inline void __unused
   le64enc(void *buf, uint64_t u)
   {
           uint8_t *p = (uint8_t *)buf;
   
           le32enc(p, (uint32_t)(u & 0xffffffffULL));
           le32enc(p + 4, (uint32_t)(u >> 32));
   }
   
   static __inline uint64_t __unused
   be64dec(const void *buf)
   {
           const uint8_t *p = (const uint8_t *)buf;
   
           return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4));
   }
   
   static __inline uint64_t __unused
   le64dec(const void *buf)
   {
           const uint8_t *p = (const uint8_t *)buf;
   
           return (le32dec(p) | ((uint64_t)le32dec(p + 4) << 32));
   }
   
   #endif /* !_LOCORE */
   #endif /* _XOPEN_SOURCE || _NETBSD_SOURCE */
   #endif /* !_SYS_ENDIAN_H_ */

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