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