usr/src/lib/librpc/xdr_reference.c

/*
 * 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
 */
#ifndef lint
static char sccsid[] = "@(#)xdr_reference.c 1.2 85/02/26 Copyr 1984 Sun Micro";
#endif

/*
 * xdr_reference.c, Generic XDR routines impelmentation.
 *
 * Copyright (C) 1984, 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 "types.h"
#include "xdr.h"
#include <stdio.h>
#define LASTUNSIGNED    ((u_int)0-1)

char *mem_alloc();

/*
 * 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 = mem_alloc(size);
                        if (loc == NULL) {
                                fprintf(stderr,
                                    "xdr_reference: out of memory\n");
                                return (FALSE);
                        }
                        bzero(loc, (int)size);
                        break;
        }

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

        if (xdrs->x_op == XDR_FREE) {
                mem_free(loc, size);
                *pp = NULL;
        }
        return (stat);
}