source: rtems-libbsd/freebsd/lib/libc/xdr/xdr_reference.c @ f41a394

#include <machine/rtems-bsd-user-space.h>

/*      $NetBSD: xdr_reference.c,v 1.13 2000/01/22 22:19:18 mycroft Exp $ */

/*
 * 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 *sccsid2 = "@(#)xdr_reference.c 1.11 87/08/11 SMI";
static char *sccsid = "@(#)xdr_reference.c      2.1 88/07/29 4.0 RPCSRC";
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

/*
 * 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 "namespace.h"
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <rpc/types.h>
#include <rpc/xdr.h>
#include "libc_private.h"

/*
 * 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)
        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 */
{
        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);
                        if (loc == NULL) {
                                warnx("xdr_reference: out of memory");
                                return (FALSE);
                        }
                        memset(loc, 0, size);
                        break;

                case XDR_ENCODE:
                        break;
                }

        stat = (*proc)(xdrs, loc);

        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)
        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));
}