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bswap.h revision 1.1 
      1 /*	$NetBSD: bswap.h,v 1.1 2010/01/05 15:45:26 tsutsui Exp $	*/
      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
     65