1 /*
2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
3 * unrestricted use provided that this legend is included on all tape
4 * media and as a part of the software program in whole or part. Users
5 * may copy or modify Sun RPC without charge, but are not authorized
6 * to license or distribute it to anyone else except as part of a product or
7 * program developed by the user.
8 *
9 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
10 * WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
11 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
12 *
13 * Sun RPC is provided with no support and without any obligation on the
14 * part of Sun Microsystems, Inc. to assist in its use, correction,
15 * modification or enhancement.
16 *
17 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
18 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
19 * OR ANY PART THEREOF.
20 *
21 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
22 * or profits or other special, indirect and consequential damages, even if
23 * Sun has been advised of the possibility of such damages.
24 *
25 * Sun Microsystems, Inc.
26 * 2550 Garcia Avenue
27 * Mountain View, California 94043
28 *
29 * @(#)xdr_reference.c 1.11 87/08/11 SMI
30 * @(#)xdr_reference.c 2.1 88/07/29 4.0 RPCSRC
31 * $NetBSD: xdr_reference.c,v 1.13 2000/01/22 22:19:18 mycroft Exp $
32 * $FreeBSD: src/lib/libc/xdr/xdr_reference.c,v 1.12 2004/10/16 06:32:43 obrien Exp $
33 */
34
35 /*
36 * xdr_reference.c, Generic XDR routines impelmentation.
37 *
38 * Copyright (C) 1987, Sun Microsystems, Inc.
39 *
40 * These are the "non-trivial" xdr primitives used to serialize and de-serialize
41 * "pointers". See xdr.h for more info on the interface to xdr.
42 */
43
44 #include "namespace.h"
45 #include <err.h>
46 #include <stdio.h>
47 #include <stdlib.h>
48 #include <string.h>
49
50 #include <rpc/types.h>
51 #include <rpc/xdr.h>
52 #include "un-namespace.h"
53
54 #include "libc_private.h"
55
56 /*
57 * XDR an indirect pointer
58 * xdr_reference is for recursively translating a structure that is
59 * referenced by a pointer inside the structure that is currently being
60 * translated. pp references a pointer to storage. If *pp is null
61 * the necessary storage is allocated.
62 * size is the sizeof the referneced structure.
63 * proc is the routine to handle the referenced structure.
64 *
65 * Parameters:
66 * pp: the pointer to work on
67 * size: size of the object pointed to
68 * proc: xdr routine to handle the object
69 */
70 bool_t
xdr_reference(XDR * xdrs,caddr_t * pp,u_int size,xdrproc_t proc)71 xdr_reference(XDR *xdrs, caddr_t *pp, u_int size, xdrproc_t proc)
72 {
73 caddr_t loc = *pp;
74 bool_t stat;
75
76 if (loc == NULL)
77 switch (xdrs->x_op) {
78 case XDR_FREE:
79 return (TRUE);
80
81 case XDR_DECODE:
82 *pp = loc = (caddr_t) mem_alloc(size);
83 if (loc == NULL) {
84 warnx("xdr_reference: out of memory");
85 return (FALSE);
86 }
87 memset(loc, 0, size);
88 break;
89
90 case XDR_ENCODE:
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
xdr_pointer(XDR * xdrs,char ** objpp,u_int obj_size,xdrproc_t xdr_obj)124 xdr_pointer(XDR *xdrs, char **objpp, u_int obj_size, xdrproc_t xdr_obj)
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