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  * 4. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      @(#)xdr_subs.h  8.3 (Berkeley) 3/30/95
   33  * $FreeBSD$
   34  */
   35 
   36 
   37 #ifndef _NFS_XDR_SUBS_H_
   38 #define _NFS_XDR_SUBS_H_
   39 
   40 /*
   41  * Macros used for conversion to/from xdr representation by nfs...
   42  * These use the MACHINE DEPENDENT routines ntohl, htonl
   43  * As defined by "XDR: External Data Representation Standard" RFC1014
   44  *
   45  * To simplify the implementation, we use ntohl/htonl even on big-endian
   46  * machines, and count on them being `#define'd away.  Some of these
   47  * might be slightly more efficient as quad_t copies on a big-endian,
   48  * but we cannot count on their alignment anyway.
   49  */
   50 
   51 #define fxdr_unsigned(t, v)     ((t)ntohl((int32_t)(v)))
   52 #define txdr_unsigned(v)        (htonl((int32_t)(v)))
   53 
   54 #define fxdr_nfsv2time(f, t) \
   55 do { \
   56         (t)->tv_sec = ntohl(((struct nfsv2_time *)(f))->nfsv2_sec); \
   57         if (((struct nfsv2_time *)(f))->nfsv2_usec != 0xffffffff) \
   58                 (t)->tv_nsec = 1000 * ntohl(((struct nfsv2_time *)(f))->nfsv2_usec); \
   59         else \
   60                 (t)->tv_nsec = 0; \
   61 } while (0)
   62 #define txdr_nfsv2time(f, t) \
   63 do { \
   64         ((struct nfsv2_time *)(t))->nfsv2_sec = htonl((f)->tv_sec); \
   65         if ((f)->tv_nsec != -1) \
   66                 ((struct nfsv2_time *)(t))->nfsv2_usec = htonl((f)->tv_nsec / 1000); \
   67         else \
   68                 ((struct nfsv2_time *)(t))->nfsv2_usec = 0xffffffff; \
   69 } while (0)
   70 
   71 #define fxdr_nfsv3time(f, t) \
   72 do { \
   73         (t)->tv_sec = ntohl(((struct nfsv3_time *)(f))->nfsv3_sec); \
   74         (t)->tv_nsec = ntohl(((struct nfsv3_time *)(f))->nfsv3_nsec); \
   75 } while (0)
   76 #define txdr_nfsv3time(f, t) \
   77 do { \
   78         ((struct nfsv3_time *)(t))->nfsv3_sec = htonl((f)->tv_sec); \
   79         ((struct nfsv3_time *)(t))->nfsv3_nsec = htonl((f)->tv_nsec); \
   80 } while (0)
   81 
   82 #define fxdr_hyper(f) \
   83         ((((u_quad_t)ntohl(((u_int32_t *)(f))[0])) << 32) | \
   84          (u_quad_t)(ntohl(((u_int32_t *)(f))[1])))
   85 #define txdr_hyper(f, t) \
   86 do { \
   87         ((u_int32_t *)(t))[0] = htonl((u_int32_t)((f) >> 32)); \
   88         ((u_int32_t *)(t))[1] = htonl((u_int32_t)((f) & 0xffffffff)); \
   89 } while (0)
   90 
   91 #endif

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