FreeBSD/Linux Kernel Cross Reference
sys/xdr/xdr_sizeof.c
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 <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/malloc.h>
44
45 #include <rpc/types.h>
46 #include <rpc/xdr.h>
47
48 /* ARGSUSED */
49 static bool_t
50 x_putlong(XDR *xdrs, const long *longp)
51 {
52
53 xdrs->x_handy += BYTES_PER_XDR_UNIT;
54 return (TRUE);
55 }
56
57 /* ARGSUSED */
58 static bool_t
59 x_putbytes(XDR *xdrs, const char *bp, u_int len)
60 {
61
62 xdrs->x_handy += len;
63 return (TRUE);
64 }
65
66 static u_int
67 x_getpostn(XDR *xdrs)
68 {
69
70 return (xdrs->x_handy);
71 }
72
73 /* ARGSUSED */
74 static bool_t
75 x_setpostn(XDR *xdrs, u_int pos)
76 {
77
78 /* This is not allowed */
79 return (FALSE);
80 }
81
82 static int32_t *
83 x_inline(XDR *xdrs, u_int len)
84 {
85
86 if (len == 0) {
87 return (NULL);
88 }
89 if (xdrs->x_op != XDR_ENCODE) {
90 return (NULL);
91 }
92 if (len < (u_int)(uintptr_t)xdrs->x_base) {
93 /* x_private was already allocated */
94 xdrs->x_handy += len;
95 return ((int32_t *) xdrs->x_private);
96 } else {
97 /* Free the earlier space and allocate new area */
98 if (xdrs->x_private)
99 free(xdrs->x_private, M_RPC);
100 if ((xdrs->x_private = (caddr_t) malloc(len, M_RPC, M_WAITOK)) == NULL) {
101 xdrs->x_base = 0;
102 return (NULL);
103 }
104 xdrs->x_base = (caddr_t)(uintptr_t) len;
105 xdrs->x_handy += len;
106 return ((int32_t *) xdrs->x_private);
107 }
108 }
109
110 static int
111 harmless(void)
112 {
113
114 /* Always return FALSE/NULL, as the case may be */
115 return (0);
116 }
117
118 static void
119 x_destroy(XDR *xdrs)
120 {
121
122 xdrs->x_handy = 0;
123 xdrs->x_base = 0;
124 if (xdrs->x_private) {
125 free(xdrs->x_private, M_RPC);
126 xdrs->x_private = NULL;
127 }
128 return;
129 }
130
131 unsigned long
132 xdr_sizeof(xdrproc_t func, void *data)
133 {
134 XDR x;
135 struct xdr_ops ops;
136 bool_t stat;
137 /* to stop ANSI-C compiler from complaining */
138 typedef bool_t (* dummyfunc1)(XDR *, long *);
139 typedef bool_t (* dummyfunc2)(XDR *, caddr_t, u_int);
140
141 ops.x_putlong = x_putlong;
142 ops.x_putbytes = x_putbytes;
143 ops.x_inline = x_inline;
144 ops.x_getpostn = x_getpostn;
145 ops.x_setpostn = x_setpostn;
146 ops.x_destroy = x_destroy;
147
148 /* the other harmless ones */
149 ops.x_getlong = (dummyfunc1) harmless;
150 ops.x_getbytes = (dummyfunc2) harmless;
151
152 x.x_op = XDR_ENCODE;
153 x.x_ops = &ops;
154 x.x_handy = 0;
155 x.x_private = (caddr_t) NULL;
156 x.x_base = (caddr_t) 0;
157
158 stat = func(&x, data);
159 if (x.x_private)
160 free(x.x_private, M_RPC);
161 return (stat == TRUE ? (unsigned) x.x_handy: 0);
162 }
Cache object: 8ee2304b03aa71b1b7a2b319465be663
|