xref: /freebsd/lib/libc/xdr/xdr_array.c (revision 2b15cb3d0922bd70ea592f0da9b4a5b167f4d53f)
1 /*	$NetBSD: xdr_array.c,v 1.12 2000/01/22 22:19:18 mycroft Exp $	*/
2 
3 /*-
4  * Copyright (c) 2010, Oracle America, Inc.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions are
8  * met:
9  *
10  *     * Redistributions of source code must retain the above copyright
11  *       notice, this list of conditions and the following disclaimer.
12  *     * Redistributions in binary form must reproduce the above
13  *       copyright notice, this list of conditions and the following
14  *       disclaimer in the documentation and/or other materials
15  *       provided with the distribution.
16  *     * Neither the name of the "Oracle America, Inc." nor the names of its
17  *       contributors may be used to endorse or promote products derived
18  *       from this software without specific prior written permission.
19  *
20  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23  *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24  *   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
25  *   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  *   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
27  *   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28  *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
29  *   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30  *   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32  */
33 
34 #if defined(LIBC_SCCS) && !defined(lint)
35 static char *sccsid2 = "@(#)xdr_array.c 1.10 87/08/11 Copyr 1984 Sun Micro";
36 static char *sccsid = "@(#)xdr_array.c	2.1 88/07/29 4.0 RPCSRC";
37 #endif
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
40 
41 /*
42  * xdr_array.c, Generic XDR routines impelmentation.
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 "namespace.h"
49 #include <err.h>
50 #include <limits.h>
51 #include <stdio.h>
52 #include <stdlib.h>
53 #include <string.h>
54 
55 #include <rpc/types.h>
56 #include <rpc/xdr.h>
57 #include "un-namespace.h"
58 
59 /*
60  * XDR an array of arbitrary elements
61  * *addrp is a pointer to the array, *sizep is the number of elements.
62  * If addrp is NULL (*sizep * elsize) bytes are allocated.
63  * elsize is the size (in bytes) of each element, and elproc is the
64  * xdr procedure to call to handle each element of the array.
65  */
66 bool_t
67 xdr_array(xdrs, addrp, sizep, maxsize, elsize, elproc)
68 	XDR *xdrs;
69 	caddr_t *addrp;		/* array pointer */
70 	u_int *sizep;		/* number of elements */
71 	u_int maxsize;		/* max numberof elements */
72 	u_int elsize;		/* size in bytes of each element */
73 	xdrproc_t elproc;	/* xdr routine to handle each element */
74 {
75 	u_int i;
76 	caddr_t target = *addrp;
77 	u_int c;  /* the actual element count */
78 	bool_t stat = TRUE;
79 	u_int nodesize;
80 
81 	/* like strings, arrays are really counted arrays */
82 	if (!xdr_u_int(xdrs, sizep)) {
83 		return (FALSE);
84 	}
85 	c = *sizep;
86 	if ((c > maxsize || UINT_MAX/elsize < c) &&
87 	    (xdrs->x_op != XDR_FREE)) {
88 		return (FALSE);
89 	}
90 	nodesize = c * elsize;
91 
92 	/*
93 	 * if we are deserializing, we may need to allocate an array.
94 	 * We also save time by checking for a null array if we are freeing.
95 	 */
96 	if (target == NULL)
97 		switch (xdrs->x_op) {
98 		case XDR_DECODE:
99 			if (c == 0)
100 				return (TRUE);
101 			*addrp = target = mem_alloc(nodesize);
102 			if (target == NULL) {
103 				warnx("xdr_array: out of memory");
104 				return (FALSE);
105 			}
106 			memset(target, 0, nodesize);
107 			break;
108 
109 		case XDR_FREE:
110 			return (TRUE);
111 
112 		case XDR_ENCODE:
113 			break;
114 	}
115 
116 	/*
117 	 * now we xdr each element of array
118 	 */
119 	for (i = 0; (i < c) && stat; i++) {
120 		stat = (*elproc)(xdrs, target);
121 		target += elsize;
122 	}
123 
124 	/*
125 	 * the array may need freeing
126 	 */
127 	if (xdrs->x_op == XDR_FREE) {
128 		mem_free(*addrp, nodesize);
129 		*addrp = NULL;
130 	}
131 	return (stat);
132 }
133 
134 /*
135  * xdr_vector():
136  *
137  * XDR a fixed length array. Unlike variable-length arrays,
138  * the storage of fixed length arrays is static and unfreeable.
139  * > basep: base of the array
140  * > size: size of the array
141  * > elemsize: size of each element
142  * > xdr_elem: routine to XDR each element
143  */
144 bool_t
145 xdr_vector(xdrs, basep, nelem, elemsize, xdr_elem)
146 	XDR *xdrs;
147 	char *basep;
148 	u_int nelem;
149 	u_int elemsize;
150 	xdrproc_t xdr_elem;
151 {
152 	u_int i;
153 	char *elptr;
154 
155 	elptr = basep;
156 	for (i = 0; i < nelem; i++) {
157 		if (!(*xdr_elem)(xdrs, elptr)) {
158 			return(FALSE);
159 		}
160 		elptr += elemsize;
161 	}
162 	return(TRUE);
163 }
164