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/nfs/xdr_subs.h

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    1 /*
    2  * Copyright (c) 1989, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * Rick Macklem at The University of Guelph.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. All advertising materials mentioning features or use of this software
   17  *    must display the following acknowledgement:
   18  *      This product includes software developed by the University of
   19  *      California, Berkeley and its contributors.
   20  * 4. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  *      @(#)xdr_subs.h  8.3 (Berkeley) 3/30/95
   37  * $FreeBSD: stable/4/sys/nfs/xdr_subs.h 50477 1999-08-28 01:08:13Z peter $
   38  */
   39 
   40 
   41 #ifndef _NFS_XDR_SUBS_H_
   42 #define _NFS_XDR_SUBS_H_
   43 
   44 /*
   45  * Macros used for conversion to/from xdr representation by nfs...
   46  * These use the MACHINE DEPENDENT routines ntohl, htonl
   47  * As defined by "XDR: External Data Representation Standard" RFC1014
   48  *
   49  * To simplify the implementation, we use ntohl/htonl even on big-endian
   50  * machines, and count on them being `#define'd away.  Some of these
   51  * might be slightly more efficient as quad_t copies on a big-endian,
   52  * but we cannot count on their alignment anyway.
   53  */
   54 
   55 #define fxdr_unsigned(t, v)     ((t)ntohl((int32_t)(v)))
   56 #define txdr_unsigned(v)        (htonl((int32_t)(v)))
   57 
   58 #define fxdr_nfsv2time(f, t) \
   59 do { \
   60         (t)->tv_sec = ntohl(((struct nfsv2_time *)(f))->nfsv2_sec); \
   61         if (((struct nfsv2_time *)(f))->nfsv2_usec != 0xffffffff) \
   62                 (t)->tv_nsec = 1000 * ntohl(((struct nfsv2_time *)(f))->nfsv2_usec); \
   63         else \
   64                 (t)->tv_nsec = 0; \
   65 } while (0)
   66 #define txdr_nfsv2time(f, t) \
   67 do { \
   68         ((struct nfsv2_time *)(t))->nfsv2_sec = htonl((f)->tv_sec); \
   69         if ((f)->tv_nsec != -1) \
   70                 ((struct nfsv2_time *)(t))->nfsv2_usec = htonl((f)->tv_nsec / 1000); \
   71         else \
   72                 ((struct nfsv2_time *)(t))->nfsv2_usec = 0xffffffff; \
   73 } while (0)
   74 
   75 #define fxdr_nfsv3time(f, t) \
   76 do { \
   77         (t)->tv_sec = ntohl(((struct nfsv3_time *)(f))->nfsv3_sec); \
   78         (t)->tv_nsec = ntohl(((struct nfsv3_time *)(f))->nfsv3_nsec); \
   79 } while (0)
   80 #define txdr_nfsv3time(f, t) \
   81 do { \
   82         ((struct nfsv3_time *)(t))->nfsv3_sec = htonl((f)->tv_sec); \
   83         ((struct nfsv3_time *)(t))->nfsv3_nsec = htonl((f)->tv_nsec); \
   84 } while (0)
   85 
   86 #define fxdr_hyper(f) \
   87         ((((u_quad_t)ntohl(((u_int32_t *)(f))[0])) << 32) | \
   88          (u_quad_t)(ntohl(((u_int32_t *)(f))[1])))
   89 #define txdr_hyper(f, t) \
   90 do { \
   91         ((u_int32_t *)(t))[0] = htonl((u_int32_t)((f) >> 32)); \
   92         ((u_int32_t *)(t))[1] = htonl((u_int32_t)((f) & 0xffffffff)); \
   93 } while (0)
   94 
   95 #endif

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