1 /* $NetBSD: xdr_reference.c,v 1.13 2000/01/22 22:19:18 mycroft Exp $ */
2
3 /*-
4 * Copyright (c) 2010, Oracle America, Inc.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are
8 * met:
9 *
10 * * Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * * Redistributions in binary form must reproduce the above
13 * copyright notice, this list of conditions and the following
14 * disclaimer in the documentation and/or other materials
15 * provided with the distribution.
16 * * Neither the name of the "Oracle America, Inc." nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
25 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
27 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 #if defined(LIBC_SCCS) && !defined(lint)
35 static char *sccsid2 = "@(#)xdr_reference.c 1.11 87/08/11 SMI";
36 static char *sccsid = "@(#)xdr_reference.c 2.1 88/07/29 4.0 RPCSRC";
37 #endif
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD: stable/10/lib/libc/xdr/xdr_reference.c 272850 2014-10-09 23:05:32Z hrs $");
40
41 /*
42 * xdr_reference.c, Generic XDR routines impelmentation.
43 *
44 * These are the "non-trivial" xdr primitives used to serialize and de-serialize
45 * "pointers". See xdr.h for more info on the interface to xdr.
46 */
47
48 #include "namespace.h"
49 #include <err.h>
50 #include <stdio.h>
51 #include <stdlib.h>
52 #include <string.h>
53
54 #include <rpc/types.h>
55 #include <rpc/xdr.h>
56 #include "libc_private.h"
57
58 /*
59 * XDR an indirect pointer
60 * xdr_reference is for recursively translating a structure that is
61 * referenced by a pointer inside the structure that is currently being
62 * translated. pp references a pointer to storage. If *pp is null
63 * the necessary storage is allocated.
64 * size is the sizeof the referneced structure.
65 * proc is the routine to handle the referenced structure.
66 */
67 bool_t
xdr_reference(xdrs,pp,size,proc)68 xdr_reference(xdrs, pp, size, proc)
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 caddr_t loc = *pp;
75 bool_t stat;
76
77 if (loc == NULL)
78 switch (xdrs->x_op) {
79 case XDR_FREE:
80 return (TRUE);
81
82 case XDR_DECODE:
83 *pp = loc = (caddr_t) mem_alloc(size);
84 if (loc == NULL) {
85 warnx("xdr_reference: out of memory");
86 return (FALSE);
87 }
88 memset(loc, 0, size);
89 break;
90
91 case XDR_ENCODE:
92 break;
93 }
94
95 stat = (*proc)(xdrs, loc);
96
97 if (xdrs->x_op == XDR_FREE) {
98 mem_free(loc, size);
99 *pp = NULL;
100 }
101 return (stat);
102 }
103
104
105 /*
106 * xdr_pointer():
107 *
108 * XDR a pointer to a possibly recursive data structure. This
109 * differs with xdr_reference in that it can serialize/deserialiaze
110 * trees correctly.
111 *
112 * What's sent is actually a union:
113 *
114 * union object_pointer switch (boolean b) {
115 * case TRUE: object_data data;
116 * case FALSE: void nothing;
117 * }
118 *
119 * > objpp: Pointer to the pointer to the object.
120 * > obj_size: size of the object.
121 * > xdr_obj: routine to XDR an object.
122 *
123 */
124 bool_t
xdr_pointer(xdrs,objpp,obj_size,xdr_obj)125 xdr_pointer(xdrs,objpp,obj_size,xdr_obj)
126 XDR *xdrs;
127 char **objpp;
128 u_int obj_size;
129 xdrproc_t xdr_obj;
130 {
131
132 bool_t more_data;
133
134 more_data = (*objpp != NULL);
135 if (! xdr_bool(xdrs,&more_data)) {
136 return (FALSE);
137 }
138 if (! more_data) {
139 *objpp = NULL;
140 return (TRUE);
141 }
142 return (xdr_reference(xdrs,objpp,obj_size,xdr_obj));
143 }
144