freebsd-dev/sys/rpc/rpcm_subs.h

/* $FreeBSD$ */
/*	$OpenBSD: nfsm_subs.h,v 1.11 2000/01/05 20:50:52 millert Exp $	*/
/*	$NetBSD: nfsm_subs.h,v 1.10 1996/03/20 21:59:56 fvdl Exp $	*/

/*
 * copyright (c) 2003
 * the regents of the university of michigan
 * all rights reserved
 * 
 * permission is granted to use, copy, create derivative works and redistribute
 * this software and such derivative works for any purpose, so long as the name
 * of the university of michigan is not used in any advertising or publicity
 * pertaining to the use or distribution of this software without specific,
 * written prior authorization.  if the above copyright notice or any other
 * identification of the university of michigan is included in any copy of any
 * portion of this software, then the disclaimer below must also be included.
 * 
 * this software is provided as is, without representation from the university
 * of michigan as to its fitness for any purpose, and without warranty by the
 * university of michigan of any kind, either express or implied, including
 * without limitation the implied warranties of merchantability and fitness for
 * a particular purpose. the regents of the university of michigan shall not be
 * liable for any damages, including special, indirect, incidental, or
 * consequential damages, with respect to any claim arising out of or in
 * connection with the use of the software, even if it has been or is hereafter
 * advised of the possibility of such damages.
 */

/*
 * Copyright (c) 1989, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Rick Macklem at The University of Guelph.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)nfsm_subs.h	8.2 (Berkeley) 3/30/95
 */


#ifndef _RPC_RPCM_SUBS_H_
#define _RPC_RPCM_SUBS_H_


/*
 * Now for the macros that do the simple stuff and call the functions
 * for the hard stuff.
 * These macros use several vars. declared in rpcm_reqhead and these
 * vars. must not be used elsewhere unless you are careful not to corrupt
 * them. The vars. starting with pN and tN (N=1,2,3,..) are temporaries
 * that may be used so long as the value is not expected to retained
 * after a macro.
 * I know, this is kind of dorkey, but it makes the actual op functions
 * fairly clean and deals with the mess caused by the xdr discriminating
 * unions.
 */

#define	rpcm_build(a,c,s) \
		{ if ((s) > M_TRAILINGSPACE(mb)) { \
			MGET(mb2, M_WAIT, MT_DATA); \
			if ((s) > MLEN) \
				panic("build > MLEN"); \
			mb->m_next = mb2; \
			mb = mb2; \
			mb->m_len = 0; \
			bpos = mtod(mb, caddr_t); \
		} \
		(a) = (c)(bpos); \
		mb->m_len += (s); \
		bpos += (s); }

#define	rpcm_dissect(a, c, s) \
		{ t1 = mtod(md, caddr_t)+md->m_len-dpos; \
		if (t1 >= (s)) { \
			(a) = (c)(dpos); \
			dpos += (s); \
		} else if ((t1 = rpcm_disct(&md, &dpos, (s), t1, &cp2)) != 0){ \
			error = t1; \
			goto rpcmout; \
		} else { \
			(a) = (c)cp2; \
		} }

#if 0
#define rpcm_mtouio(p,s) \
		if ((s) > 0 && \
		   (t1 = rpcm_mbuftouio(&md,(p),(s),&dpos)) != 0) { \
			error = t1; \
			goto rpcmout; \
		}
#endif

#define rpcm_rndup(a)	(((a)+3)&(~0x3))

#define	rpcm_adv(s) \
		{ t1 = mtod(md, caddr_t)+md->m_len-dpos; \
		if (t1 >= (s)) { \
			dpos += (s); \
		} else if ((t1 = rpc_adv(&md, &dpos, (s), t1)) != 0) { \
			error = t1; \
			goto rpcmout; \
		} }

#define RPCMADV(m, s)   (m)->m_data += (s)

#endif /* _RPC_RPCM_SUBS_H_ */