source: rtems/cpukit/librpc/src/xdr/xdr_reference.c @ f26145b

4.104.114.84.95
Last change on this file since f26145b was df49c60, checked in by Joel Sherrill <joel.sherrill@…>, on Jun 12, 2000 at 3:00:15 PM

Merged from 4.5.0-beta3a

  • Property mode set to 100644
File size: 3.8 KB
Line 
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, MERCHANTIBILITY 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
30#if defined(LIBC_SCCS) && !defined(lint)
31/*static char *sccsid = "from: @(#)xdr_reference.c 1.11 87/08/11 SMI";*/
32/*static char *sccsid = "from: @(#)xdr_reference.c      2.1 88/07/29 4.0 RPCSRC";*/
33static char *rcsid = "$FreeBSD: src/lib/libc/xdr/xdr_reference.c,v 1.8 1999/08/28 00:02:56 peter Exp $";
34#endif
35
36/*
37 * xdr_reference.c, Generic XDR routines impelmentation.
38 *
39 * Copyright (C) 1987, Sun Microsystems, Inc.
40 *
41 * These are the "non-trivial" xdr primitives used to serialize and de-serialize
42 * "pointers".  See xdr.h for more info on the interface to xdr.
43 */
44
45#include <stdio.h>
46#include <stdlib.h>
47#include <string.h>
48#include <rpc/types.h>
49#include <rpc/xdr.h>
50
51#define LASTUNSIGNED ((u_int) 0-1)
52
53/*
54 * XDR an indirect pointer
55 * xdr_reference is for recursively translating a structure that is
56 * referenced by a pointer inside the structure that is currently being
57 * translated.  pp references a pointer to storage. If *pp is null
58 * the  necessary storage is allocated.
59 * size is the sizeof the referneced structure.
60 * proc is the routine to handle the referenced structure.
61 */
62bool_t
63xdr_reference(xdrs, pp, size, proc)
64        register XDR *xdrs;
65        caddr_t *pp;            /* the pointer to work on */
66        u_int size;             /* size of the object pointed to */
67        xdrproc_t proc;         /* xdr routine to handle the object */
68{
69        register caddr_t loc = *pp;
70        register bool_t stat;
71
72        if (loc == NULL)
73                switch (xdrs->x_op) {
74                case XDR_FREE:
75                        return (TRUE);
76
77                case XDR_DECODE:
78                        *pp = loc = (caddr_t) mem_alloc(size);
79                        if (loc == NULL) {
80                                (void) fprintf(stderr,
81                                    "xdr_reference: out of memory\n");
82                                return (FALSE);
83                        }
84                        memset(loc, 0, (int)size);
85                        break;
86                case XDR_ENCODE:  /* to avoid warning */
87                        break;
88        }
89
90        stat = (*proc)(xdrs, loc, LASTUNSIGNED);
91
92        if (xdrs->x_op == XDR_FREE) {
93                mem_free(loc, size);
94                *pp = NULL;
95        }
96        return (stat);
97}
98
99
100/*
101 * xdr_pointer():
102 *
103 * XDR a pointer to a possibly recursive data structure. This
104 * differs with xdr_reference in that it can serialize/deserialiaze
105 * trees correctly.
106 *
107 *  What's sent is actually a union:
108 *
109 *  union object_pointer switch (boolean b) {
110 *  case TRUE: object_data data;
111 *  case FALSE: void nothing;
112 *  }
113 *
114 * > objpp: Pointer to the pointer to the object.
115 * > obj_size: size of the object.
116 * > xdr_obj: routine to XDR an object.
117 *
118 */
119bool_t
120xdr_pointer(xdrs,objpp,obj_size,xdr_obj)
121        register XDR *xdrs;
122        char **objpp;
123        u_int obj_size;
124        xdrproc_t xdr_obj;
125{
126
127        bool_t more_data;
128
129        more_data = (*objpp != NULL);
130        if (! xdr_bool(xdrs,&more_data)) {
131                return (FALSE);
132        }
133        if (! more_data) {
134                *objpp = NULL;
135                return (TRUE);
136        }
137        return (xdr_reference(xdrs,objpp,obj_size,xdr_obj));
138}
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