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)
33static char *sccsid2 = "@(#)xdr_array.c 1.10 87/08/11 Copyr 1984 Sun Micro";
34static 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 */
63bool_t
64xdr_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 */
140bool_t
141xdr_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}
156