133 lines
3.6 KiB
C
133 lines
3.6 KiB
C
/* @(#)xdr_reference.c 2.1 88/07/29 4.0 RPCSRC */
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/*
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* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
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* unrestricted use provided that this legend is included on all tape
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* media and as a part of the software program in whole or part. Users
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* may copy or modify Sun RPC without charge, but are not authorized
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* to license or distribute it to anyone else except as part of a product or
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* program developed by the user.
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*
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* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
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* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
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*
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* Sun RPC is provided with no support and without any obligation on the
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* part of Sun Microsystems, Inc. to assist in its use, correction,
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* modification or enhancement.
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*
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* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
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* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
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* OR ANY PART THEREOF.
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*
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* In no event will Sun Microsystems, Inc. be liable for any lost revenue
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* or profits or other special, indirect and consequential damages, even if
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* Sun has been advised of the possibility of such damages.
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*
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* Sun Microsystems, Inc.
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* 2550 Garcia Avenue
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* Mountain View, California 94043
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*/
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#if !defined(lint) && defined(SCCSIDS)
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static char sccsid[] = "@(#)xdr_reference.c 1.11 87/08/11 SMI";
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#endif
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/*
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* xdr_reference.c, Generic XDR routines impelmentation.
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*
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* Copyright (C) 1987, Sun Microsystems, Inc.
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*
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* These are the "non-trivial" xdr primitives used to serialize and de-serialize
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* "pointers". See xdr.h for more info on the interface to xdr.
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*/
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#include <stdio.h>
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#include <rpc/types.h>
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#include <rpc/xdr.h>
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#define LASTUNSIGNED ((u_int)0-1)
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/*
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* XDR an indirect pointer
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* xdr_reference is for recursively translating a structure that is
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* referenced by a pointer inside the structure that is currently being
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* translated. pp references a pointer to storage. If *pp is null
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* the necessary storage is allocated.
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* size is the sizeof the referneced structure.
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* proc is the routine to handle the referenced structure.
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*/
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bool_t
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xdr_reference(xdrs, pp, size, proc)
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register XDR *xdrs;
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caddr_t *pp; /* the pointer to work on */
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u_int size; /* size of the object pointed to */
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xdrproc_t proc; /* xdr routine to handle the object */
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{
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register caddr_t loc = *pp;
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register bool_t stat;
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if (loc == NULL)
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switch (xdrs->x_op) {
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case XDR_FREE:
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return (TRUE);
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case XDR_DECODE:
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*pp = loc = (caddr_t) mem_alloc(size);
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if (loc == NULL) {
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(void) fprintf(stderr,
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"xdr_reference: out of memory\n");
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return (FALSE);
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}
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bzero(loc, (int)size);
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break;
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}
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stat = (*proc)(xdrs, loc, LASTUNSIGNED);
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if (xdrs->x_op == XDR_FREE) {
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mem_free(loc, size);
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*pp = NULL;
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}
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return (stat);
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}
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/*
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* xdr_pointer():
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*
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* XDR a pointer to a possibly recursive data structure. This
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* differs with xdr_reference in that it can serialize/deserialiaze
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* trees correctly.
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*
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* What's sent is actually a union:
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*
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* union object_pointer switch (boolean b) {
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* case TRUE: object_data data;
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* case FALSE: void nothing;
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* }
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*
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* > objpp: Pointer to the pointer to the object.
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* > obj_size: size of the object.
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* > xdr_obj: routine to XDR an object.
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*
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*/
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bool_t
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xdr_pointer(xdrs,objpp,obj_size,xdr_obj)
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register XDR *xdrs;
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char **objpp;
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u_int obj_size;
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xdrproc_t xdr_obj;
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{
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bool_t more_data;
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more_data = (*objpp != NULL);
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if (! xdr_bool(xdrs,&more_data)) {
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return (FALSE);
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}
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if (! more_data) {
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*objpp = NULL;
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return (TRUE);
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}
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return (xdr_reference(xdrs,objpp,obj_size,xdr_obj));
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}
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