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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* Portions of this source code were derived from Berkeley 4.3 BSD
* under license from the Regents of the University of California.
*/
/*
* #if !defined(lint) && defined(SCCSIDS)
* static char sccsid[] = "@(#)xdr_refer.c 1.21 89/02/28 SMI";
* #endif
*/
/*
* xdr_refer.c, Generic XDR routines impelmentation.
*
* These are the "non-trivial" xdr primitives used to serialize and de-serialize
* "pointers". See xdr.h for more info on the interface to xdr.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <rpc/types.h>
#include <rpc/xdr.h>
#define LASTUNSIGNED ((uint_t)0-1)
/*
* XDR an indirect pointer
* xdr_reference is for recursively translating a structure that is
* referenced by a pointer inside the structure that is currently being
* translated. pp references a pointer to storage. If *pp is null
* the necessary storage is allocated.
* size is the sizeof the referneced structure.
* proc is the routine to handle the referenced structure.
*/
bool_t
xdr_reference(XDR *xdrs, caddr_t *pp, uint_t size, const xdrproc_t proc)
{
caddr_t loc = *pp;
bool_t stat;
if (loc == NULL) {
switch (xdrs->x_op) {
case XDR_FREE:
return (TRUE);
case XDR_DECODE:
*pp = loc = (caddr_t)mem_alloc(size);
bzero(loc, size);
break;
case XDR_ENCODE:
break;
}
}
stat = (*proc)(xdrs, loc, LASTUNSIGNED);
if (xdrs->x_op == XDR_FREE) {
mem_free(loc, size);
*pp = NULL;
}
return (stat);
}
/*
* xdr_pointer():
*
* XDR a pointer to a possibly recursive data structure. This
* differs with xdr_reference in that it can serialize/deserialiaze
* trees correctly.
*
* What's sent is actually a union:
*
* union object_pointer switch (boolean b) {
* case TRUE: object_data data;
* case FALSE: void nothing;
* }
*
* > objpp: Pointer to the pointer to the object.
* > obj_size: size of the object.
* > xdr_obj: routine to XDR an object.
*
*/
bool_t
xdr_pointer(XDR *xdrs, char **objpp, uint_t obj_size, const xdrproc_t xdr_obj)
{
bool_t more_data;
more_data = (*objpp != NULL);
if (!xdr_bool(xdrs, &more_data))
return (FALSE);
if (!more_data) {
*objpp = NULL;
return (TRUE);
}
return (xdr_reference(xdrs, objpp, obj_size, xdr_obj));
}
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