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28f540f4 RM |
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. | |
6d52618b | 9 | * |
28f540f4 RM |
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. | |
6d52618b | 13 | * |
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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. | |
6d52618b | 17 | * |
28f540f4 RM |
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. | |
6d52618b | 21 | * |
28f540f4 RM |
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. | |
6d52618b | 25 | * |
28f540f4 RM |
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 | /* | |
6d52618b | 35 | * xdr_reference.c, Generic XDR routines implementation. |
28f540f4 RM |
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> | |
e7fd8a39 | 44 | #include <string.h> |
28f540f4 RM |
45 | #include <rpc/types.h> |
46 | #include <rpc/xdr.h> | |
47 | ||
48 | #define LASTUNSIGNED ((u_int)0-1) | |
49 | ||
50 | /* | |
51 | * XDR an indirect pointer | |
52 | * xdr_reference is for recursively translating a structure that is | |
53 | * referenced by a pointer inside the structure that is currently being | |
54 | * translated. pp references a pointer to storage. If *pp is null | |
55 | * the necessary storage is allocated. | |
6d52618b | 56 | * size is the size of the referneced structure. |
28f540f4 RM |
57 | * proc is the routine to handle the referenced structure. |
58 | */ | |
59 | bool_t | |
e7fd8a39 UD |
60 | xdr_reference (xdrs, pp, size, proc) |
61 | XDR *xdrs; | |
62 | caddr_t *pp; /* the pointer to work on */ | |
63 | u_int size; /* size of the object pointed to */ | |
64 | xdrproc_t proc; /* xdr routine to handle the object */ | |
28f540f4 | 65 | { |
e7fd8a39 UD |
66 | caddr_t loc = *pp; |
67 | bool_t stat; | |
28f540f4 | 68 | |
e7fd8a39 UD |
69 | if (loc == NULL) |
70 | switch (xdrs->x_op) | |
71 | { | |
72 | case XDR_FREE: | |
73 | return TRUE; | |
28f540f4 | 74 | |
e7fd8a39 UD |
75 | case XDR_DECODE: |
76 | *pp = loc = (caddr_t) mem_alloc (size); | |
77 | if (loc == NULL) | |
78 | { | |
79 | (void) fputs (_("xdr_reference: out of memory\n"), stderr); | |
80 | return FALSE; | |
81 | } | |
82 | bzero (loc, (int) size); | |
83 | break; | |
84 | default: | |
85 | break; | |
86 | } | |
28f540f4 | 87 | |
e7fd8a39 | 88 | stat = (*proc) (xdrs, loc, LASTUNSIGNED); |
28f540f4 | 89 | |
e7fd8a39 UD |
90 | if (xdrs->x_op == XDR_FREE) |
91 | { | |
92 | mem_free (loc, size); | |
93 | *pp = NULL; | |
94 | } | |
95 | return stat; | |
28f540f4 RM |
96 | } |
97 | ||
98 | ||
99 | /* | |
100 | * xdr_pointer(): | |
101 | * | |
102 | * XDR a pointer to a possibly recursive data structure. This | |
6d52618b | 103 | * differs with xdr_reference in that it can serialize/deserialize |
28f540f4 RM |
104 | * trees correctly. |
105 | * | |
106 | * What's sent is actually a union: | |
107 | * | |
108 | * union object_pointer switch (boolean b) { | |
109 | * case TRUE: object_data data; | |
110 | * case FALSE: void nothing; | |
111 | * } | |
112 | * | |
113 | * > objpp: Pointer to the pointer to the object. | |
114 | * > obj_size: size of the object. | |
115 | * > xdr_obj: routine to XDR an object. | |
116 | * | |
117 | */ | |
118 | bool_t | |
e7fd8a39 UD |
119 | xdr_pointer (xdrs, objpp, obj_size, xdr_obj) |
120 | XDR *xdrs; | |
121 | char **objpp; | |
122 | u_int obj_size; | |
123 | xdrproc_t xdr_obj; | |
28f540f4 RM |
124 | { |
125 | ||
e7fd8a39 | 126 | bool_t more_data; |
28f540f4 | 127 | |
e7fd8a39 UD |
128 | more_data = (*objpp != NULL); |
129 | if (!xdr_bool (xdrs, &more_data)) | |
130 | { | |
131 | return FALSE; | |
132 | } | |
133 | if (!more_data) | |
134 | { | |
135 | *objpp = NULL; | |
136 | return TRUE; | |
137 | } | |
138 | return xdr_reference (xdrs, objpp, obj_size, xdr_obj); | |
28f540f4 | 139 | } |