sbin/disklabel/bswap.h

   1 /*      $NetBSD$        */
   2
   3 /*-
   4  * Copyright (c) 2009 Izumi Tsutsui.  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 #include <sys/types.h>
  28
  29 #if HAVE_NBTOOL_CONFIG_H
  30 #ifndef BYTE_ORDER
  31 #ifdef WORDS_BIGENDIAN
  32 #define BYTE_ORDER              BIG_ENDIAN
  33 #else
  34 #define BYTE_ORDER              LITTLE_ENDIAN
  35 #endif
  36 #endif
  37 #endif
  38
  39 #ifndef TARGET_BYTE_ORDER
  40 #define TARGET_BYTE_ORDER       BYTE_ORDER
  41 #endif
  42
  43 #if TARGET_BYTE_ORDER != BYTE_ORDER
  44 #define htotarget16(x)          bswap16(x)
  45 #define target16toh(x)          bswap16(x)
  46 #define htotarget32(x)          bswap32(x)
  47 #define target32toh(x)          bswap32(x)
  48 #define dkcksum_target(lp)      dkcksum_re(lp)
  49
  50 void htotargetlabel(struct disklabel *, struct disklabel *);
  51 void targettohlabel(struct disklabel *, struct disklabel *);
  52 uint16_t dkcksum_re(struct disklabel *);
  53
  54 #else
  55 #define htotarget16(x)          (x)
  56 #define target16toh(x)          (x)
  57 #define htotarget32(x)          (x)
  58 #define target32toh(x)          (x)
  59 #define dkcksum_target(lp)      dkcksum(lp)
  60 #define htotargetlabel(tlp, hlp)                                        \
  61             do {*(tlp) = *(hlp);} while (/* CONSTCOND */0)
  62 #define targettohlabel(hlp, tlp)                                        \
  63             do {*(hlp) = *(tlp);} while (/* CONSTCOND */0)
  64 #endif