rpc.subproj/xdr_array.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
  27  * unrestricted use provided that this legend is included on all tape
  28  * media and as a part of the software program in whole or part.  Users
  29  * may copy or modify Sun RPC without charge, but are not authorized
  30  * to license or distribute it to anyone else except as part of a product or
  31  * program developed by the user.
  32  *
  33  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  34  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  35  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  36  *
  37  * Sun RPC is provided with no support and without any obligation on the
  38  * part of Sun Microsystems, Inc. to assist in its use, correction,
  39  * modification or enhancement.
  40  *
  41  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  42  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  43  * OR ANY PART THEREOF.
  44  *
  45  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  46  * or profits or other special, indirect and consequential damages, even if
  47  * Sun has been advised of the possibility of such damages.
  48  *
  49  * Sun Microsystems, Inc.
  50  * 2550 Garcia Avenue
  51  * Mountain View, California  94043
  52  */
  53
  54 #if defined(LIBC_SCCS) && !defined(lint)
  55 /*static char *sccsid = "from: @(#)xdr_array.c 1.10 87/08/11 Copyr 1984 Sun Micro";*/
  56 /*static char *sccsid = "from: @(#)xdr_array.c  2.1 88/07/29 4.0 RPCSRC";*/
  57 static char *rcsid = "$Id: xdr_array.c,v 1.4 2003/06/23 17:24:59 majka Exp $";
  58 #endif
  59
  60 /*
  61  * xdr_array.c, Generic XDR routines impelmentation.
  62  *
  63  * Copyright (C) 1984, Sun Microsystems, Inc.
  64  *
  65  * These are the "non-trivial" xdr primitives used to serialize and de-serialize
  66  * arrays.  See xdr.h for more info on the interface to xdr.
  67  */
  68
  69 #include <stdio.h>
  70 #include <stdlib.h>
  71 #include <string.h>
  72 #include <rpc/types.h>
  73 #include <rpc/xdr.h>
  74
  75 #define LASTUNSIGNED    ((u_int)0-1)
  76
  77
  78 /*
  79  * XDR an array of arbitrary elements
  80  * *addrp is a pointer to the array, *sizep is the number of elements.
  81  * If addrp is NULL (*sizep * elsize) bytes are allocated.
  82  * elsize is the size (in bytes) of each element, and elproc is the
  83  * xdr procedure to call to handle each element of the array.
  84  */
  85 bool_t
  86 xdr_array(xdrs, addrp, sizep, maxsize, elsize, elproc)
  87         register XDR *xdrs;
  88         caddr_t *addrp;         /* array pointer */
  89         u_int *sizep;           /* number of elements */
  90         u_int maxsize;          /* max numberof elements */
  91         u_int elsize;           /* size in bytes of each element */
  92         xdrproc_t elproc;       /* xdr routine to handle each element */
  93 {
  94         register u_int i;
  95         register caddr_t target = *addrp;
  96         register u_int c;  /* the actual element count */
  97         register bool_t stat = TRUE;
  98         register u_int nodesize;
  99
 100         /* like strings, arrays are really counted arrays */
 101         if (! xdr_u_int(xdrs, sizep)) {
 102                 return (FALSE);
 103         }
 104         c = *sizep;
 105         if ((c > maxsize) && (xdrs->x_op != XDR_FREE)) {
 106                 return (FALSE);
 107         }
 108         nodesize = c * elsize;
 109
 110         /*
 111          * if we are deserializing, we may need to allocate an array.
 112          * We also save time by checking for a null array if we are freeing.
 113          */
 114         if (target == NULL)
 115                 switch (xdrs->x_op) {
 116                 case XDR_DECODE:
 117                         if (c == 0)
 118                                 return (TRUE);
 119                         *addrp = target = mem_alloc(nodesize);
 120                         if (target == NULL) {
 121                                 (void) fprintf(stderr,
 122                                         "xdr_array: out of memory\n");
 123                                 return (FALSE);
 124                         }
 125                         bzero(target, nodesize);
 126                         break;
 127
 128                 case XDR_FREE:
 129                         return (TRUE);
 130
 131                 default: break;
 132         }
 133
 134         /*
 135          * now we xdr each element of array
 136          */
 137         for (i = 0; (i < c) && stat; i++) {
 138                 stat = (*elproc)(xdrs, target, LASTUNSIGNED);
 139                 target += elsize;
 140         }
 141
 142         /*
 143          * the array may need freeing
 144          */
 145         if (xdrs->x_op == XDR_FREE) {
 146                 mem_free(*addrp, nodesize);
 147                 *addrp = NULL;
 148         }
 149         return (stat);
 150 }
 151
 152 /*
 153  * xdr_vector():
 154  *
 155  * XDR a fixed length array. Unlike variable-length arrays,
 156  * the storage of fixed length arrays is static and unfreeable.
 157  * > basep: base of the array
 158  * > size: size of the array
 159  * > elemsize: size of each element
 160  * > xdr_elem: routine to XDR each element
 161  */
 162 bool_t
 163 xdr_vector(xdrs, basep, nelem, elemsize, xdr_elem)
 164         register XDR *xdrs;
 165         register char *basep;
 166         register u_int nelem;
 167         register u_int elemsize;
 168         register xdrproc_t xdr_elem;
 169 {
 170         register u_int i;
 171         register char *elptr;
 172
 173         elptr = basep;
 174         for (i = 0; i < nelem; i++) {
 175                 if (! (*xdr_elem)(xdrs, elptr, LASTUNSIGNED)) {
 176                         return(FALSE);
 177                 }
 178                 elptr += elemsize;
 179         }
 180         return(TRUE);
 181 }
 182