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xdr_reference.c revision 1.3 
      1 /*	$NetBSD: xdr_reference.c,v 1.3 1995/02/25 03:02:08 cgd Exp $	*/
      2 
      3 /*
      4  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
      5  * unrestricted use provided that this legend is included on all tape
      6  * media and as a part of the software program in whole or part.  Users
      7  * may copy or modify Sun RPC without charge, but are not authorized
      8  * to license or distribute it to anyone else except as part of a product or
      9  * program developed by the user.
     10  *
     11  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
     12  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
     13  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
     14  *
     15  * Sun RPC is provided with no support and without any obligation on the
     16  * part of Sun Microsystems, Inc. to assist in its use, correction,
     17  * modification or enhancement.
     18  *
     19  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
     20  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
     21  * OR ANY PART THEREOF.
     22  *
     23  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
     24  * or profits or other special, indirect and consequential damages, even if
     25  * Sun has been advised of the possibility of such damages.
     26  *
     27  * Sun Microsystems, Inc.
     28  * 2550 Garcia Avenue
     29  * Mountain View, California  94043
     30  */
     31 
     32 #if defined(LIBC_SCCS) && !defined(lint)
     33 /*static char *sccsid = "from: @(#)xdr_reference.c 1.11 87/08/11 SMI";*/
     34 /*static char *sccsid = "from: @(#)xdr_reference.c	2.1 88/07/29 4.0 RPCSRC";*/
     35 static char *rcsid = "$NetBSD: xdr_reference.c,v 1.3 1995/02/25 03:02:08 cgd Exp $";
     36 #endif
     37 
     38 /*
     39  * xdr_reference.c, Generic XDR routines impelmentation.
     40  *
     41  * Copyright (C) 1987, Sun Microsystems, Inc.
     42  *
     43  * These are the "non-trivial" xdr primitives used to serialize and de-serialize
     44  * "pointers".  See xdr.h for more info on the interface to xdr.
     45  */
     46 
     47 #include <stdio.h>
     48 #include <stdlib.h>
     49 #include <rpc/types.h>
     50 #include <rpc/xdr.h>
     51 
     52 #define LASTUNSIGNED	((u_int)0-1)
     53 
     54 /*
     55  * XDR an indirect pointer
     56  * xdr_reference is for recursively translating a structure that is
     57  * referenced by a pointer inside the structure that is currently being
     58  * translated.  pp references a pointer to storage. If *pp is null
     59  * the  necessary storage is allocated.
     60  * size is the sizeof the referneced structure.
     61  * proc is the routine to handle the referenced structure.
     62  */
     63 bool_t
     64 xdr_reference(xdrs, pp, size, proc)
     65 	register XDR *xdrs;
     66 	caddr_t *pp;		/* the pointer to work on */
     67 	u_int size;		/* size of the object pointed to */
     68 	xdrproc_t proc;		/* xdr routine to handle the object */
     69 {
     70 	register caddr_t loc = *pp;
     71 	register bool_t stat;
     72 
     73 	if (loc == NULL)
     74 		switch (xdrs->x_op) {
     75 		case XDR_FREE:
     76 			return (TRUE);
     77 
     78 		case XDR_DECODE:
     79 			*pp = loc = (caddr_t) mem_alloc(size);
     80 			if (loc == NULL) {
     81 				(void) fprintf(stderr,
     82 				    "xdr_reference: out of memory\n");
     83 				return (FALSE);
     84 			}
     85 			bzero(loc, (int)size);
     86 			break;
     87 	}
     88 
     89 	stat = (*proc)(xdrs, loc, LASTUNSIGNED);
     90 
     91 	if (xdrs->x_op == XDR_FREE) {
     92 		mem_free(loc, size);
     93 		*pp = NULL;
     94 	}
     95 	return (stat);
     96 }
     97 
     98 
     99 /*
    100  * xdr_pointer():
    101  *
    102  * XDR a pointer to a possibly recursive data structure. This
    103  * differs with xdr_reference in that it can serialize/deserialiaze
    104  * trees correctly.
    105  *
    106  *  What's sent is actually a union:
    107  *
    108  *  union object_pointer switch (boolean b) {
    109  *  case TRUE: object_data data;
    110  *  case FALSE: void nothing;
    111  *  }
    112  *
    113  * > objpp: Pointer to the pointer to the object.
    114  * > obj_size: size of the object.
    115  * > xdr_obj: routine to XDR an object.
    116  *
    117  */
    118 bool_t
    119 xdr_pointer(xdrs,objpp,obj_size,xdr_obj)
    120 	register XDR *xdrs;
    121 	char **objpp;
    122 	u_int obj_size;
    123 	xdrproc_t xdr_obj;
    124 {
    125 
    126 	bool_t more_data;
    127 
    128 	more_data = (*objpp != NULL);
    129 	if (! xdr_bool(xdrs,&more_data)) {
    130 		return (FALSE);
    131 	}
    132 	if (! more_data) {
    133 		*objpp = NULL;
    134 		return (TRUE);
    135 	}
    136 	return (xdr_reference(xdrs,objpp,obj_size,xdr_obj));
    137 }
    138