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      1 /*	$NetBSD: bswap.h,v 1.3 2016/01/31 18:57:29 christos 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 #else
     38 #include <sys/endian.h>
     39 #endif
     40 
     41 #if !defined(NATIVELABEL_ONLY)
     42 extern int bswap_p;
     43 extern u_int maxpartitions;
     44 
     45 #define htotarget16(x)		(bswap_p ? bswap16(x) : (x))
     46 #define target16toh(x)		(bswap_p ? bswap16(x) : (x))
     47 #define htotarget32(x)		(bswap_p ? bswap32(x) : (x))
     48 #define target32toh(x)		(bswap_p ? bswap32(x) : (x))
     49 
     50 void htotargetlabel(struct disklabel *, const struct disklabel *);
     51 void targettohlabel(struct disklabel *, const struct disklabel *);
     52 uint16_t dkcksum_target(struct disklabel *);
     53 #else
     54 #define htotarget16(x)		(x)
     55 #define target16toh(x)		(x)
     56 #define htotarget32(x)		(x)
     57 #define target32toh(x)		(x)
     58 
     59 #define htotargetlabel(dl, sl)	do { *(dl) = *(sl); } while (0)
     60 #define targettohlabel(dl, sl)	do { *(dl) = *(sl); } while (0)
     61 #define dkcksum_target(label)	dkcksum(label)
     62 #endif /* !NATIVELABEL_ONLY */
     63