The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * Copyright (c) 2002 Thomas Moestl <tmm@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/5.0/sys/sys/endian.h 95737 2002-04-29 16:58:54Z mike $
   27  */
   28 
   29 #ifndef _SYS_ENDIAN_H_
   30 #define _SYS_ENDIAN_H_
   31 
   32 #include <sys/cdefs.h>
   33 #include <sys/_types.h>
   34 #include <machine/endian.h>
   35 
   36 #ifndef _UINT16_T_DECLARED
   37 typedef __uint16_t      uint16_t;
   38 #define _UINT16_T_DECLARED
   39 #endif
   40  
   41 #ifndef _UINT32_T_DECLARED
   42 typedef __uint32_t      uint32_t;
   43 #define _UINT32_T_DECLARED
   44 #endif
   45  
   46 #ifndef _UINT64_T_DECLARED
   47 typedef __uint64_t      uint64_t;
   48 #define _UINT64_T_DECLARED
   49 #endif
   50  
   51 /*
   52  * General byte order swapping functions.
   53  */
   54 #define bswap16(x)      __bswap16(x)
   55 #define bswap32(x)      __bswap32(x)
   56 #define bswap64(x)      __bswap64(x)
   57 
   58 /*
   59  * Host to big endian, host to little endian, big endian to host, and little
   60  * endian to host byte order functions as detailed in byteorder(9).
   61  */
   62 #if _BYTE_ORDER == _LITTLE_ENDIAN
   63 #define htobe16(x)      bswap16((x))
   64 #define htobe32(x)      bswap32((x))
   65 #define htobe64(x)      bswap64((x))
   66 #define htole16(x)      ((uint16_t)(x))
   67 #define htole32(x)      ((uint32_t)(x))
   68 #define htole64(x)      ((uint64_t)(x))
   69 
   70 #define be16toh(x)      bswap16((x))
   71 #define be32toh(x)      bswap32((x))
   72 #define be64toh(x)      bswap64((x))
   73 #define le16toh(x)      ((uint16_t)(x))
   74 #define le32toh(x)      ((uint32_t)(x))
   75 #define le64toh(x)      ((uint64_t)(x))
   76 #else /* _BYTE_ORDER != _LITTLE_ENDIAN */
   77 #define htobe16(x)      ((uint16_t)(x))
   78 #define htobe32(x)      ((uint32_t)(x))
   79 #define htobe64(x)      ((uint64_t)(x))
   80 #define htole16(x)      bswap16((x))
   81 #define htole32(x)      bswap32((x))
   82 #define htole64(x)      bswap64((x))
   83 
   84 #define be16toh(x)      ((uint16_t)(x))
   85 #define be32toh(x)      ((uint32_t)(x))
   86 #define be64toh(x)      ((uint64_t)(x))
   87 #define le16toh(x)      bswap16((x))
   88 #define le32toh(x)      bswap32((x))
   89 #define le64toh(x)      bswap64((x))
   90 #endif /* _BYTE_ORDER == _LITTLE_ENDIAN */
   91 
   92 #endif  /* _SYS_ENDIAN_H_ */

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