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 * xdr_sizeof.c
31 *
32 * Copyright 1990 Sun Microsystems, Inc.
33 *
34 * General purpose routine to see how much space something will use
35 * when serialized using XDR.
36 */
37
38#include <sys/cdefs.h>
39__FBSDID("$FreeBSD$");
40
41#include "namespace.h"
42#include <rpc/types.h>
43#include <rpc/xdr.h>
44#include <sys/types.h>
45#include <stdlib.h>
46#include "un-namespace.h"
47
48/* ARGSUSED */
49static bool_t
50x_putlong(xdrs, longp)
51	XDR *xdrs;
52	long *longp;
53{
54	xdrs->x_handy += BYTES_PER_XDR_UNIT;
55	return (TRUE);
56}
57
58/* ARGSUSED */
59static bool_t
60x_putbytes(xdrs, bp, len)
61	XDR *xdrs;
62	char  *bp;
63	u_int len;
64{
65	xdrs->x_handy += len;
66	return (TRUE);
67}
68
69static u_int
70x_getpostn(xdrs)
71	XDR *xdrs;
72{
73	return (xdrs->x_handy);
74}
75
76/* ARGSUSED */
77static bool_t
78x_setpostn(xdrs, pos)
79	XDR *xdrs;
80	u_int pos;
81{
82	/* This is not allowed */
83	return (FALSE);
84}
85
86static int32_t *
87x_inline(xdrs, len)
88	XDR *xdrs;
89	u_int len;
90{
91	if (len == 0) {
92		return (NULL);
93	}
94	if (xdrs->x_op != XDR_ENCODE) {
95		return (NULL);
96	}
97	if (len < (u_int)(uintptr_t)xdrs->x_base) {
98		/* x_private was already allocated */
99		xdrs->x_handy += len;
100		return ((int32_t *) xdrs->x_private);
101	} else {
102		/* Free the earlier space and allocate new area */
103		if (xdrs->x_private)
104			free(xdrs->x_private);
105		if ((xdrs->x_private = (caddr_t) malloc(len)) == NULL) {
106			xdrs->x_base = 0;
107			return (NULL);
108		}
109		xdrs->x_base = (caddr_t)(uintptr_t)len;
110		xdrs->x_handy += len;
111		return ((int32_t *) xdrs->x_private);
112	}
113}
114
115static int
116harmless()
117{
118	/* Always return FALSE/NULL, as the case may be */
119	return (0);
120}
121
122static void
123x_destroy(xdrs)
124	XDR *xdrs;
125{
126	xdrs->x_handy = 0;
127	xdrs->x_base = 0;
128	if (xdrs->x_private) {
129		free(xdrs->x_private);
130		xdrs->x_private = NULL;
131	}
132	return;
133}
134
135unsigned long
136xdr_sizeof(func, data)
137	xdrproc_t func;
138	void *data;
139{
140	XDR x;
141	struct xdr_ops ops;
142	bool_t stat;
143	/* to stop ANSI-C compiler from complaining */
144	typedef  bool_t (* dummyfunc1)(XDR *, long *);
145	typedef  bool_t (* dummyfunc2)(XDR *, caddr_t, u_int);
146
147	ops.x_putlong = x_putlong;
148	ops.x_putbytes = x_putbytes;
149	ops.x_inline = x_inline;
150	ops.x_getpostn = x_getpostn;
151	ops.x_setpostn = x_setpostn;
152	ops.x_destroy = x_destroy;
153
154	/* the other harmless ones */
155	ops.x_getlong =  (dummyfunc1) harmless;
156	ops.x_getbytes = (dummyfunc2) harmless;
157
158	x.x_op = XDR_ENCODE;
159	x.x_ops = &ops;
160	x.x_handy = 0;
161	x.x_private = (caddr_t) NULL;
162	x.x_base = (caddr_t) 0;
163
164	stat = func(&x, data);
165	if (x.x_private)
166		free(x.x_private);
167	return (stat == TRUE ? (unsigned) x.x_handy: 0);
168}
169