external/cddl/osnet/dist/uts/common/rpc/xdr_array.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 /*      Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T     */
  27 /*        All Rights Reserved   */
  28
  29 /*
  30  * Portions of this source code were derived from Berkeley 4.3 BSD
  31  * under license from the Regents of the University of California.
  32  */
  33
  34 /*
  35  * xdr_array.c, Generic XDR routines impelmentation.
  36  * These are the "non-trivial" xdr primitives used to serialize and de-serialize
  37  * arrays.  See xdr.h for more info on the interface to xdr.
  38  */
  39
  40 #include <sys/param.h>
  41 #include <sys/cmn_err.h>
  42 #include <sys/types.h>
  43 #include <sys/systm.h>
  44
  45 #include <rpc/types.h>
  46 #include <rpc/xdr.h>
  47
  48 #define LASTUNSIGNED    ((uint_t)0-1)
  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
  58 xdr_array(XDR *xdrs, caddr_t *addrp, uint_t *sizep, const uint_t maxsize,
  59         const uint_t elsize, const xdrproc_t elproc)
  60 {
  61         uint_t i;
  62         caddr_t target = *addrp;
  63         uint_t c;  /* the actual element count */
  64         bool_t stat = TRUE;
  65         uint_t nodesize;
  66
  67         /* like strings, arrays are really counted arrays */
  68         if (!xdr_u_int(xdrs, sizep)) {
  69                 return (FALSE);
  70         }
  71         c = *sizep;
  72         if ((c > maxsize || LASTUNSIGNED / elsize < c) &&
  73             xdrs->x_op != XDR_FREE) {
  74                 return (FALSE);
  75         }
  76         nodesize = c * elsize;
  77
  78         /*
  79          * if we are deserializing, we may need to allocate an array.
  80          * We also save time by checking for a null array if we are freeing.
  81          */
  82         if (target == NULL)
  83                 switch (xdrs->x_op) {
  84                 case XDR_DECODE:
  85                         if (c == 0)
  86                                 return (TRUE);
  87                         *addrp = target = (char *)mem_alloc(nodesize);
  88                         bzero(target, nodesize);
  89                         break;
  90
  91                 case XDR_FREE:
  92                         return (TRUE);
  93
  94                 case XDR_ENCODE:
  95                         break;
  96                 }
  97
  98         /*
  99          * now we xdr each element of array
 100          */
 101         for (i = 0; (i < c) && stat; i++) {
 102                 stat = (*elproc)(xdrs, target, LASTUNSIGNED);
 103                 target += elsize;
 104         }
 105
 106         /*
 107          * the array may need freeing
 108          */
 109         if (xdrs->x_op == XDR_FREE) {
 110                 mem_free(*addrp, nodesize);
 111                 *addrp = NULL;
 112         }
 113         return (stat);
 114 }