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/*

 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for

 * unrestricted use provided that this legend is included on all tape

 * media and as a part of the software program in whole or part.  Users

 * may copy or modify Sun RPC without charge, but are not authorized

 * to license or distribute it to anyone else except as part of a product or

 * program developed by the user.

 *

 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE

 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.

 *

 * Sun RPC is provided with no support and without any obligation on the

 * part of Sun Microsystems, Inc. to assist in its use, correction,

 * modification or enhancement.

 *

 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE

 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC

 * OR ANY PART THEREOF.

 *

 * In no event will Sun Microsystems, Inc. be liable for any lost revenue

 * or profits or other special, indirect and consequential damages, even if

 * Sun has been advised of the possibility of such damages.

 *

 * Sun Microsystems, Inc.

 * 2550 Garcia Avenue

 * Mountain View, California  94043

 */

#if defined(LIBC_SCCS) && !defined(lint)

/*static char *sccsid = "from: @(#)xdr_reference.c 1.11 87/08/11 SMI";*/

/*static char *sccsid = "from: @(#)xdr_reference.c      2.1 88/07/29 4.0 RPCSRC";*/

static char *rcsid = "$FreeBSD: src/lib/libc/xdr/xdr_reference.c,v 1.8 1999/08/28 00:02:56 peter Exp $";

#endif

/*

 * xdr_reference.c, Generic XDR routines impelmentation.

 *

 * Copyright (C) 1987, Sun Microsystems, Inc.

 *

 * 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 <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <rpc/types.h>

#include <rpc/xdr.h>

#define LASTUNSIGNED ((u_int) 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(xdrs, pp, size, proc)

        register XDR *xdrs;

        caddr_t *pp;            /* the pointer to work on */

        u_int size;             /* size of the object pointed to */

        xdrproc_t proc;         /* xdr routine to handle the object */

{

        register caddr_t loc = *pp;

        register 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);

                        if (loc == NULL) {

                                (void) fprintf(stderr,

                                    "xdr_reference: out of memory\n");

                                return (FALSE);

                        }

                        memset(loc, 0, (int)size);

                        break;

                case XDR_ENCODE:  /* to avoid warning */

                        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(xdrs,objpp,obj_size,xdr_obj)

        register XDR *xdrs;

        char **objpp;

        u_int obj_size;

        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));

}