usr/src/lib/libc/port/nsl/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, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22
  23 /*
  24  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  25  * Use is subject to license terms.
  26  */
  27
  28 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
  29 /* All Rights Reserved */
  30 /*
  31  * Portions of this source code were derived from Berkeley
  32  * 4.3 BSD under license from the Regents of the University of
  33  * California.
  34  */
  35
  36 /*
  37  * Generic XDR routines impelmentation.
  38  *
  39  * These are the "non-trivial" xdr primitives used to serialize and de-serialize
  40  * arrays.  See xdr.h for more info on the interface to xdr.
  41  */
  42
  43 #include "mt.h"
  44 #include <sys/types.h>
  45 #include <syslog.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48
  49 #include <rpc/types.h>
  50 #include <rpc/xdr.h>
  51 #include <memory.h>
  52
  53 #define LASTUNSIGNED    ((uint_t)0-1)
  54
  55 char mem_err_msg_arr[] = "xdr_array: out of memory";
  56
  57 /*
  58  * XDR an array of arbitrary elements
  59  * *addrp is a pointer to the array, *sizep is the number of elements.
  60  * If *addrp is NULL (*sizep * elsize) bytes are allocated.
  61  * elsize is the size (in bytes) of each element, and elproc is the
  62  * xdr procedure to call to handle each element of the array.
  63  */
  64 bool_t
  65 xdr_array(XDR *xdrs, caddr_t *addrp, uint_t *sizep, const uint_t maxsize,
  66     const uint_t elsize, const xdrproc_t elproc)
  67 {
  68         uint_t i;
  69         caddr_t target = *addrp;
  70         uint_t c;  /* the actual element count */
  71         bool_t stat = TRUE;
  72         uint_t nodesize;
  73
  74         /* like strings, arrays are really counted arrays */
  75         if (!xdr_u_int(xdrs, sizep))
  76                 return (FALSE);
  77         c = *sizep;
  78         if ((c > maxsize || LASTUNSIGNED / elsize < c) &&
  79             xdrs->x_op != XDR_FREE)
  80                 return (FALSE);
  81         nodesize = c * elsize;
  82
  83         /*
  84          * if we are deserializing, we may need to allocate an array.
  85          * We also save time by checking for a null array if we are freeing.
  86          */
  87         if (target == NULL)
  88                 switch (xdrs->x_op) {
  89                 case XDR_DECODE:
  90                         if (c == 0)
  91                                 return (TRUE);
  92                         *addrp = target = malloc(nodesize);
  93                         if (target == NULL) {
  94                                 (void) syslog(LOG_ERR, mem_err_msg_arr);
  95                                 return (FALSE);
  96                         }
  97                         (void) memset(target, 0, nodesize);
  98                         break;
  99
 100                 case XDR_FREE:
 101                         return (TRUE);
 102         }
 103
 104         /*
 105          * now we xdr each element of array
 106          */
 107         for (i = 0; (i < c) && stat; i++) {
 108                 stat = (*elproc)(xdrs, target);
 109                 target += elsize;
 110         }
 111
 112         /*
 113          * the array may need freeing
 114          */
 115         if (xdrs->x_op == XDR_FREE) {
 116                 free(*addrp);
 117                 *addrp = NULL;
 118         }
 119         return (stat);
 120 }
 121
 122 /*
 123  * xdr_vector():
 124  *
 125  * XDR a fixed length array. Unlike variable-length arrays,
 126  * the storage of fixed length arrays is static and unfreeable.
 127  * > basep: base of the array
 128  * > size: size of the array
 129  * > elemsize: size of each element
 130  * > xdr_elem: routine to XDR each element
 131  */
 132 bool_t
 133 xdr_vector(XDR *xdrs, char *basep, const uint_t nelem,
 134     const uint_t elemsize, const xdrproc_t xdr_elem)
 135 {
 136         uint_t i;
 137         char *elptr;
 138
 139         /* Make sure x_op contains a valid value */
 140         if (xdrs->x_op != XDR_ENCODE &&
 141             xdrs->x_op != XDR_DECODE &&
 142             xdrs->x_op != XDR_FREE)
 143                 return (FALSE);
 144
 145         elptr = basep;
 146         for (i = 0; i < nelem; i++) {
 147                 if (!(*xdr_elem)(xdrs, elptr, LASTUNSIGNED))
 148                         return (FALSE);
 149                 elptr += elemsize;
 150         }
 151         return (TRUE);
 152 }