FreeBSD/Linux Kernel Cross Reference
sys/xdr/xdr_array.c
1 /* $NetBSD: xdr_array.c,v 1.12 2000/01/22 22:19:18 mycroft Exp $ */
2
3 /*
4 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
5 * unrestricted use provided that this legend is included on all tape
6 * media and as a part of the software program in whole or part. Users
7 * may copy or modify Sun RPC without charge, but are not authorized
8 * to license or distribute it to anyone else except as part of a product or
9 * program developed by the user.
10 *
11 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
12 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
13 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
14 *
15 * Sun RPC is provided with no support and without any obligation on the
16 * part of Sun Microsystems, Inc. to assist in its use, correction,
17 * modification or enhancement.
18 *
19 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
20 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
21 * OR ANY PART THEREOF.
22 *
23 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
24 * or profits or other special, indirect and consequential damages, even if
25 * Sun has been advised of the possibility of such damages.
26 *
27 * Sun Microsystems, Inc.
28 * 2550 Garcia Avenue
29 * Mountain View, California 94043
30 */
31
32 #if defined(LIBC_SCCS) && !defined(lint)
33 static char *sccsid2 = "@(#)xdr_array.c 1.10 87/08/11 Copyr 1984 Sun Micro";
34 static char *sccsid = "@(#)xdr_array.c 2.1 88/07/29 4.0 RPCSRC";
35 #endif
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
38
39 /*
40 * xdr_array.c, Generic XDR routines impelmentation.
41 *
42 * Copyright (C) 1984, Sun Microsystems, Inc.
43 *
44 * These are the "non-trivial" xdr primitives used to serialize and de-serialize
45 * arrays. See xdr.h for more info on the interface to xdr.
46 */
47
48 #include <sys/param.h>
49 #include <sys/systm.h>
50 #include <sys/limits.h>
51 #include <sys/malloc.h>
52
53 #include <rpc/types.h>
54 #include <rpc/xdr.h>
55
56 /*
57 * XDR an array of arbitrary elements
58 * *addrp is a pointer to the array, *sizep is the number of elements.
59 * If addrp is NULL (*sizep * elsize) bytes are allocated.
60 * elsize is the size (in bytes) of each element, and elproc is the
61 * xdr procedure to call to handle each element of the array.
62 */
63 bool_t
64 xdr_array(XDR *xdrs,
65 caddr_t *addrp, /* array pointer */
66 u_int *sizep, /* number of elements */
67 u_int maxsize, /* max numberof elements */
68 u_int elsize, /* size in bytes of each element */
69 xdrproc_t elproc) /* xdr routine to handle each element */
70 {
71 u_int i;
72 caddr_t target = *addrp;
73 u_int c; /* the actual element count */
74 bool_t stat = TRUE;
75 u_int nodesize;
76
77 /* like strings, arrays are really counted arrays */
78 if (!xdr_u_int(xdrs, sizep)) {
79 return (FALSE);
80 }
81 c = *sizep;
82 if ((c > maxsize || UINT_MAX/elsize < c) &&
83 (xdrs->x_op != XDR_FREE)) {
84 return (FALSE);
85 }
86 nodesize = c * elsize;
87
88 /*
89 * if we are deserializing, we may need to allocate an array.
90 * We also save time by checking for a null array if we are freeing.
91 */
92 if (target == NULL)
93 switch (xdrs->x_op) {
94 case XDR_DECODE:
95 if (c == 0)
96 return (TRUE);
97 *addrp = target = mem_alloc(nodesize);
98 if (target == NULL) {
99 printf("xdr_array: out of memory");
100 return (FALSE);
101 }
102 memset(target, 0, nodesize);
103 break;
104
105 case XDR_FREE:
106 return (TRUE);
107
108 case XDR_ENCODE:
109 break;
110 }
111
112 /*
113 * now we xdr each element of array
114 */
115 for (i = 0; (i < c) && stat; i++) {
116 stat = (*elproc)(xdrs, target);
117 target += elsize;
118 }
119
120 /*
121 * the array may need freeing
122 */
123 if (xdrs->x_op == XDR_FREE) {
124 mem_free(*addrp, nodesize);
125 *addrp = NULL;
126 }
127 return (stat);
128 }
129
130 /*
131 * xdr_vector():
132 *
133 * XDR a fixed length array. Unlike variable-length arrays,
134 * the storage of fixed length arrays is static and unfreeable.
135 * > basep: base of the array
136 * > size: size of the array
137 * > elemsize: size of each element
138 * > xdr_elem: routine to XDR each element
139 */
140 bool_t
141 xdr_vector(XDR *xdrs, char *basep, u_int nelem, u_int elemsize,
142 xdrproc_t xdr_elem)
143 {
144 u_int i;
145 char *elptr;
146
147 elptr = basep;
148 for (i = 0; i < nelem; i++) {
149 if (!(*xdr_elem)(xdrs, elptr)) {
150 return(FALSE);
151 }
152 elptr += elemsize;
153 }
154 return(TRUE);
155 }
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