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xdr_reference.c revision 1.5.4.1 
      1 /*	$NetBSD: xdr_reference.c,v 1.5.4.1 1996/09/16 23:44:48 jtc 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 1.5.4.1 1996/09/16 23:44:48 jtc 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 "namespace.h"
     48 #include <stdio.h>
     49 #include <stdlib.h>
     50 #include <string.h>
     51 #include <rpc/types.h>
     52 #include <rpc/xdr.h>
     53 
     54 #ifdef __weak_alias
     55 __weak_alias(xdr_pointer,_xdr_pointer);
     56 __weak_alias(xdr_reference,_xdr_reference);
     57 #endif
     58 
     59 /*
     60  * XDR an indirect pointer
     61  * xdr_reference is for recursively translating a structure that is
     62  * referenced by a pointer inside the structure that is currently being
     63  * translated.  pp references a pointer to storage. If *pp is null
     64  * the  necessary storage is allocated.
     65  * size is the sizeof the referneced structure.
     66  * proc is the routine to handle the referenced structure.
     67  */
     68 bool_t
     69 xdr_reference(xdrs, pp, size, proc)
     70 	register XDR *xdrs;
     71 	caddr_t *pp;		/* the pointer to work on */
     72 	u_int size;		/* size of the object pointed to */
     73 	xdrproc_t proc;		/* xdr routine to handle the object */
     74 {
     75 	register caddr_t loc = *pp;
     76 	register bool_t stat;
     77 
     78 	if (loc == NULL)
     79 		switch (xdrs->x_op) {
     80 		case XDR_FREE:
     81 			return (TRUE);
     82 
     83 		case XDR_DECODE:
     84 			*pp = loc = (caddr_t) mem_alloc(size);
     85 			if (loc == NULL) {
     86 				(void) fprintf(stderr,
     87 				    "xdr_reference: out of memory\n");
     88 				return (FALSE);
     89 			}
     90 			memset(loc, 0, (int)size);
     91 			break;
     92 	}
     93 
     94 	stat = (*proc)(xdrs, loc);
     95 
     96 	if (xdrs->x_op == XDR_FREE) {
     97 		mem_free(loc, size);
     98 		*pp = NULL;
     99 	}
    100 	return (stat);
    101 }
    102 
    103 
    104 /*
    105  * xdr_pointer():
    106  *
    107  * XDR a pointer to a possibly recursive data structure. This
    108  * differs with xdr_reference in that it can serialize/deserialiaze
    109  * trees correctly.
    110  *
    111  *  What's sent is actually a union:
    112  *
    113  *  union object_pointer switch (boolean b) {
    114  *  case TRUE: object_data data;
    115  *  case FALSE: void nothing;
    116  *  }
    117  *
    118  * > objpp: Pointer to the pointer to the object.
    119  * > obj_size: size of the object.
    120  * > xdr_obj: routine to XDR an object.
    121  *
    122  */
    123 bool_t
    124 xdr_pointer(xdrs,objpp,obj_size,xdr_obj)
    125 	register XDR *xdrs;
    126 	char **objpp;
    127 	u_int obj_size;
    128 	xdrproc_t xdr_obj;
    129 {
    130 
    131 	bool_t more_data;
    132 
    133 	more_data = (*objpp != NULL);
    134 	if (! xdr_bool(xdrs,&more_data)) {
    135 		return (FALSE);
    136 	}
    137 	if (! more_data) {
    138 		*objpp = NULL;
    139 		return (TRUE);
    140 	}
    141 	return (xdr_reference(xdrs,objpp,obj_size,xdr_obj));
    142 }
    143