endian.h

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    1 /*      $OpenBSD: endian.h,v 1.25 2014/12/21 04:49:00 guenther Exp $    */
    2 
    3 /*-
    4  * Copyright (c) 1997 Niklas Hallqvist.  All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  */
   26 
   27 /*
   28  * Public definitions for little- and big-endian systems.
   29  * This file should be included as <endian.h> in userspace and as
   30  * <sys/endian.h> in the kernel.
   31  *
   32  * System headers that need endian information but that can't or don't
   33  * want to export the public names here should include <sys/_endian.h>
   34  * and use the internal names: _BYTE_ORDER, _*_ENDIAN, etc.
   35  */
   36 
   37 #ifndef _SYS_ENDIAN_H_
   38 #define _SYS_ENDIAN_H_
   39 
   40 #include <sys/cdefs.h>
   41 #include <sys/_endian.h>
   42 
   43 /* Public names */
   44 #define LITTLE_ENDIAN   _LITTLE_ENDIAN
   45 #define BIG_ENDIAN      _BIG_ENDIAN
   46 #define PDP_ENDIAN      _PDP_ENDIAN
   47 #define BYTE_ORDER      _BYTE_ORDER
   48 
   49 
   50 /*
   51  * These are specified to be function-like macros to match the spec
   52  */
   53 #define htobe16(x)      __htobe16(x)
   54 #define htobe32(x)      __htobe32(x)
   55 #define htobe64(x)      __htobe64(x)
   56 #define htole16(x)      __htole16(x)
   57 #define htole32(x)      __htole32(x)
   58 #define htole64(x)      __htole64(x)
   59 
   60 /* POSIX names */
   61 #define be16toh(x)      __htobe16(x)
   62 #define be32toh(x)      __htobe32(x)
   63 #define be64toh(x)      __htobe64(x)
   64 #define le16toh(x)      __htole16(x)
   65 #define le32toh(x)      __htole32(x)
   66 #define le64toh(x)      __htole64(x)
   67 
   68 
   69 #if __BSD_VISIBLE
   70 #define swap16(x) __swap16(x)
   71 #define swap32(x) __swap32(x)
   72 #define swap64(x) __swap64(x)
   73 
   74 #define swap16_multi(v, n) do {                                         \
   75         __size_t __swap16_multi_n = (n);                                \
   76         __uint16_t *__swap16_multi_v = (v);                             \
   77                                                                         \
   78         while (__swap16_multi_n) {                                      \
   79                 *__swap16_multi_v = swap16(*__swap16_multi_v);          \
   80                 __swap16_multi_v++;                                     \
   81                 __swap16_multi_n--;                                     \
   82         }                                                               \
   83 } while (0)
   84 
   85 /* original BSD names */
   86 #define betoh16(x)      __htobe16(x)
   87 #define betoh32(x)      __htobe32(x)
   88 #define betoh64(x)      __htobe64(x)
   89 #define letoh16(x)      __htole16(x)
   90 #define letoh32(x)      __htole32(x)
   91 #define letoh64(x)      __htole64(x)
   92 
   93 #ifndef htons
   94 /* these were exposed here before */
   95 #define htons(x)        __htobe16(x)
   96 #define htonl(x)        __htobe32(x)
   97 #define ntohs(x)        __htobe16(x)
   98 #define ntohl(x)        __htobe32(x)
   99 #endif
  100 
  101 /* ancient stuff */
  102 #define NTOHL(x) (x) = ntohl((u_int32_t)(x))
  103 #define NTOHS(x) (x) = ntohs((u_int16_t)(x))
  104 #define HTONL(x) (x) = htonl((u_int32_t)(x))
  105 #define HTONS(x) (x) = htons((u_int16_t)(x))
  106 #endif /* __BSD_VISIBLE */
  107 
  108 #ifdef _KERNEL
  109 /* to/from memory conversions */
  110 #define bemtoh16        __bemtoh16
  111 #define bemtoh32        __bemtoh32
  112 #define bemtoh64        __bemtoh64
  113 #define htobem16        __htobem16
  114 #define htobem32        __htobem32
  115 #define htobem64        __htobem64
  116 #define lemtoh16        __lemtoh16
  117 #define lemtoh32        __lemtoh32
  118 #define lemtoh64        __lemtoh64
  119 #define htolem16        __htolem16
  120 #define htolem32        __htolem32
  121 #define htolem64        __htolem64
  122 #endif /* _KERNEL */
  123 
  124 #endif /* _SYS_ENDIAN_H_ */

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

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sys/sys/endian.h