1 /* $NetBSD: xdr_reference.c,v 1.13 2000/01/22 22:19:18 mycroft Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-3-Clause
5 *
6 * Copyright (c) 2010, Oracle America, Inc.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are
10 * met:
11 *
12 * * Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * * Redistributions in binary form must reproduce the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer in the documentation and/or other materials
17 * provided with the distribution.
18 * * Neither the name of the "Oracle America, Inc." nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
27 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
29 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
33 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35
36 #if defined(LIBC_SCCS) && !defined(lint)
37 static char *sccsid2 = "@(#)xdr_reference.c 1.11 87/08/11 SMI";
38 static char *sccsid = "@(#)xdr_reference.c 2.1 88/07/29 4.0 RPCSRC";
39 #endif
40 /*
41 * xdr_reference.c, Generic XDR routines implementation.
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 <err.h>
49 #include <stdio.h>
50 #include <stdlib.h>
51 #include <string.h>
52
53 #include <rpc/types.h>
54 #include <rpc/xdr.h>
55 #include "libc_private.h"
56
57 /*
58 * XDR an indirect pointer
59 * xdr_reference is for recursively translating a structure that is
60 * referenced by a pointer inside the structure that is currently being
61 * translated. pp references a pointer to storage. If *pp is null
62 * the necessary storage is allocated.
63 * size is the sizeof the referneced structure.
64 * proc is the routine to handle the referenced structure.
65 */
66 bool_t
xdr_reference(XDR * xdrs,caddr_t * pp,u_int size,xdrproc_t proc)67 xdr_reference(XDR *xdrs, caddr_t *pp, u_int size, xdrproc_t proc)
68 /*
69 * XDR *xdrs;
70 * caddr_t *pp; // the pointer to work on
71 * u_int size; // size of the object pointed to
72 * xdrproc_t proc; // xdr routine to handle the object
73 */
74 {
75 caddr_t loc = *pp;
76 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 warnx("xdr_reference: out of memory");
87 return (FALSE);
88 }
89 memset(loc, 0, size);
90 break;
91
92 case XDR_ENCODE:
93 break;
94 }
95
96 stat = (*proc)(xdrs, loc);
97
98 if (xdrs->x_op == XDR_FREE) {
99 mem_free(loc, size);
100 *pp = NULL;
101 }
102 return (stat);
103 }
104
105
106 /*
107 * xdr_pointer():
108 *
109 * XDR a pointer to a possibly recursive data structure. This
110 * differs with xdr_reference in that it can serialize/deserialiaze
111 * trees correctly.
112 *
113 * What's sent is actually a union:
114 *
115 * union object_pointer switch (boolean b) {
116 * case TRUE: object_data data;
117 * case FALSE: void nothing;
118 * }
119 *
120 * > objpp: Pointer to the pointer to the object.
121 * > obj_size: size of the object.
122 * > xdr_obj: routine to XDR an object.
123 *
124 */
125 bool_t
xdr_pointer(XDR * xdrs,char ** objpp,u_int obj_size,xdrproc_t xdr_obj)126 xdr_pointer(XDR *xdrs, char **objpp, u_int obj_size, xdrproc_t xdr_obj)
127 {
128
129 bool_t more_data;
130
131 more_data = (*objpp != NULL);
132 if (! xdr_bool(xdrs,&more_data)) {
133 return (FALSE);
134 }
135 if (! more_data) {
136 *objpp = NULL;
137 return (TRUE);
138 }
139 return (xdr_reference(xdrs,objpp,obj_size,xdr_obj));
140 }
141