xdr_refer.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* 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 1991 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.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* 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/types.h>
#include <rpc/trace.h>
#ifdef KERNEL
#include <sys/param.h>
#else
#include <syslog.h>
#include <stdio.h>
#include <stdlib.h>
#endif
#include <rpc/types.h>
#include <rpc/xdr.h>
#include <memory.h>
#define LASTUNSIGNED ((u_int)0-1)
char mem_err_msg_ref[] = "xdr_reference: out of memory";
/*
* 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, u_int size, xdrproc_t proc)
{
register caddr_t loc = *pp;
register bool_t stat;
trace2(TR_xdr_reference, 0, size);
if (loc == NULL)
switch (xdrs->x_op) {
case XDR_FREE:
trace1(TR_xdr_reference, 1);
return (TRUE);
case XDR_DECODE:
*pp = loc = (caddr_t) mem_alloc(size);
#ifndef KERNEL
if (loc == NULL) {
(void) syslog(LOG_ERR, mem_err_msg_ref);
trace1(TR_xdr_reference, 1);
return (FALSE);
}
(void) memset(loc, 0, (int)size);
#else
(void) memset(loc, 0, size);
#endif
break;
}
stat = (*proc)(xdrs, loc, LASTUNSIGNED);
if (xdrs->x_op == XDR_FREE) {
mem_free(loc, size);
*pp = NULL;
}
trace1(TR_xdr_reference, 1);
return (stat);
}
#ifndef KERNEL
/*
* 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, u_int obj_size, xdrproc_t xdr_obj)
{
bool_t more_data;
bool_t dummy;
trace2(TR_xdr_pointer, 0, obj_size);
more_data = (*objpp != NULL);
if (! xdr_bool(xdrs, &more_data)) {
trace1(TR_xdr_pointer, 1);
return (FALSE);
}
if (! more_data) {
*objpp = NULL;
trace1(TR_xdr_pointer, 1);
return (TRUE);
}
dummy = xdr_reference(xdrs, objpp, obj_size, xdr_obj);
trace1(TR_xdr_pointer, 1);
return (dummy);
}
#endif /* ! KERNEL */