xdr_array.c

   1 /* @(#)xdr_array.c      2.1 88/07/29 4.0 RPCSRC */
   2 /*
   3  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   4  * unrestricted use provided that this legend is included on all tape
   5  * media and as a part of the software program in whole or part.  Users
   6  * may copy or modify Sun RPC without charge, but are not authorized
   7  * to license or distribute it to anyone else except as part of a product or
   8  * program developed by the user.
   9  *
  10  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  11  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  12  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  13  *
  14  * Sun RPC is provided with no support and without any obligation on the
  15  * part of Sun Microsystems, Inc. to assist in its use, correction,
  16  * modification or enhancement.
  17  *
  18  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  19  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  20  * OR ANY PART THEREOF.
  21  *
  22  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  23  * or profits or other special, indirect and consequential damages, even if
  24  * Sun has been advised of the possibility of such damages.
  25  *
  26  * Sun Microsystems, Inc.
  27  * 2550 Garcia Avenue
  28  * Mountain View, California  94043
  29  */
  30 #if 0
  31 static char sccsid[] = "@(#)xdr_array.c 1.10 87/08/11 Copyr 1984 Sun Micro";
  32 #endif
  33
  34 /*
  35  * xdr_array.c, Generic XDR routines implementation.
  36  *
  37  * Copyright (C) 1984, Sun Microsystems, Inc.
  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 #define __FORCE_GLIBC
  44 #include <features.h>
  45
  46 #include <stdio.h>
  47 #include <string.h>
  48 #include <rpc/types.h>
  49 #include <rpc/xdr.h>
  50 #include <limits.h>
  51
  52 #ifdef USE_IN_LIBIO
  53 # include <wchar.h>
  54 #endif
  55
  56
  57 #define LASTUNSIGNED    ((u_int)0-1)
  58
  59
  60 /*
  61  * XDR an array of arbitrary elements
  62  * *addrp is a pointer to the array, *sizep is the number of elements.
  63  * If addrp is NULL (*sizep * elsize) bytes are allocated.
  64  * elsize is the size (in bytes) of each element, and elproc is the
  65  * xdr procedure to call to handle each element of the array.
  66  */
  67 bool_t
  68 xdr_array (XDR *xdrs, caddr_t *addrp, u_int *sizep, u_int maxsize, u_int elsize, xdrproc_t elproc)
  69 {
  70   u_int i;
  71   caddr_t target = *addrp;
  72   u_int c;              /* the actual element count */
  73   bool_t stat = TRUE;
  74   u_int nodesize;
  75
  76   /* like strings, arrays are really counted arrays */
  77   if (!xdr_u_int (xdrs, sizep))
  78     {
  79       return FALSE;
  80     }
  81   c = *sizep;
  82   /*
  83    * XXX: Let the overflow possibly happen with XDR_FREE because mem_free()
  84    * doesn't actually use its second argument anyway.
  85    */
  86   if ((c > maxsize || c > UINT_MAX / elsize) && (xdrs->x_op != XDR_FREE))
  87     {
  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       {
  99       case XDR_DECODE:
 100         if (c == 0)
 101           return TRUE;
 102         *addrp = target = mem_alloc (nodesize);
 103         if (target == NULL)
 104           {
 105 #ifdef USE_IN_LIBIO
 106             if (_IO_fwide (stderr, 0) > 0)
 107               (void) fwprintf (stderr, L"%s",
 108                                  _("xdr_array: out of memory\n"));
 109             else
 110 #endif
 111               (void) fputs (_("xdr_array: out of memory\n"), stderr);
 112             return FALSE;
 113           }
 114         memset (target, 0, nodesize);
 115         break;
 116
 117       case XDR_FREE:
 118         return TRUE;
 119       default:
 120         break;
 121       }
 122
 123   /*
 124    * now we xdr each element of array
 125    */
 126   for (i = 0; (i < c) && stat; i++)
 127     {
 128       stat = (*elproc) (xdrs, target, LASTUNSIGNED);
 129       target += elsize;
 130     }
 131
 132   /*
 133    * the array may need freeing
 134    */
 135   if (xdrs->x_op == XDR_FREE)
 136     {
 137       mem_free (*addrp, nodesize);
 138       *addrp = NULL;
 139     }
 140   return stat;
 141 }
 142 libc_hidden_def(xdr_array)
 143
 144 /*
 145  * xdr_vector():
 146  *
 147  * XDR a fixed length array. Unlike variable-length arrays,
 148  * the storage of fixed length arrays is static and unfreeable.
 149  * > basep: base of the array
 150  * > size: size of the array
 151  * > elemsize: size of each element
 152  * > xdr_elem: routine to XDR each element
 153  */
 154 bool_t
 155 xdr_vector (XDR *xdrs, char *basep, u_int nelem, u_int elemsize,
 156                         xdrproc_t xdr_elem)
 157 {
 158   u_int i;
 159   char *elptr;
 160
 161   elptr = basep;
 162   for (i = 0; i < nelem; i++)
 163     {
 164       if (!(*xdr_elem) (xdrs, elptr, LASTUNSIGNED))
 165         {
 166           return FALSE;
 167         }
 168       elptr += elemsize;
 169     }
 170   return TRUE;
 171 }