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 #include <sys/cdefs.h>
33 /*
34 * xdr_array.c, Generic XDR routines implementation.
35 *
36 * Copyright (C) 1984, Sun Microsystems, Inc.
37 *
38 * These are the "non-trivial" xdr primitives used to serialize and de-serialize
39 * arrays. See xdr.h for more info on the interface to xdr.
40 */
41
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/limits.h>
45 #include <sys/malloc.h>
46
47 #include <rpc/types.h>
48 #include <rpc/xdr.h>
49
50 /*
51 * XDR an array of arbitrary elements
52 * *addrp is a pointer to the array, *sizep is the number of elements.
53 * If addrp is NULL (*sizep * elsize) bytes are allocated.
54 * elsize is the size (in bytes) of each element, and elproc is the
55 * xdr procedure to call to handle each element of the array.
56 */
57 bool_t
xdr_array(XDR * xdrs,caddr_t * addrp,u_int * sizep,u_int maxsize,u_int elsize,xdrproc_t elproc)58 xdr_array(XDR *xdrs,
59 caddr_t *addrp, /* array pointer */
60 u_int *sizep, /* number of elements */
61 u_int maxsize, /* max numberof elements */
62 u_int elsize, /* size in bytes of each element */
63 xdrproc_t elproc) /* xdr routine to handle each element */
64 {
65 u_int i;
66 caddr_t target = *addrp;
67 u_int c; /* the actual element count */
68 bool_t stat = TRUE;
69 u_int nodesize;
70
71 /* like strings, arrays are really counted arrays */
72 if (!xdr_u_int(xdrs, sizep)) {
73 return (FALSE);
74 }
75 c = *sizep;
76 if ((c > maxsize || UINT_MAX/elsize < c) &&
77 (xdrs->x_op != XDR_FREE)) {
78 return (FALSE);
79 }
80 nodesize = c * elsize;
81
82 /*
83 * if we are deserializing, we may need to allocate an array.
84 * We also save time by checking for a null array if we are freeing.
85 */
86 if (target == NULL)
87 switch (xdrs->x_op) {
88 case XDR_DECODE:
89 if (c == 0)
90 return (TRUE);
91 *addrp = target = mem_alloc(nodesize);
92 if (target == NULL) {
93 printf("xdr_array: out of memory");
94 return (FALSE);
95 }
96 memset(target, 0, nodesize);
97 break;
98
99 case XDR_FREE:
100 return (TRUE);
101
102 case XDR_ENCODE:
103 break;
104 }
105
106 /*
107 * now we xdr each element of array
108 */
109 for (i = 0; (i < c) && stat; i++) {
110 stat = (*elproc)(xdrs, target);
111 target += elsize;
112 }
113
114 /*
115 * the array may need freeing
116 */
117 if (xdrs->x_op == XDR_FREE) {
118 mem_free(*addrp, nodesize);
119 *addrp = NULL;
120 }
121 return (stat);
122 }
123
124 /*
125 * xdr_vector():
126 *
127 * XDR a fixed length array. Unlike variable-length arrays,
128 * the storage of fixed length arrays is static and unfreeable.
129 * > basep: base of the array
130 * > size: size of the array
131 * > elemsize: size of each element
132 * > xdr_elem: routine to XDR each element
133 */
134 bool_t
xdr_vector(XDR * xdrs,char * basep,u_int nelem,u_int elemsize,xdrproc_t xdr_elem)135 xdr_vector(XDR *xdrs, char *basep, u_int nelem, u_int elemsize,
136 xdrproc_t xdr_elem)
137 {
138 u_int i;
139 char *elptr;
140
141 elptr = basep;
142 for (i = 0; i < nelem; i++) {
143 if (!(*xdr_elem)(xdrs, elptr)) {
144 return(FALSE);
145 }
146 elptr += elemsize;
147 }
148 return(TRUE);
149 }
150