sunrpc/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 !defined(lint) && defined(SCCSIDS)
  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 #include <stdio.h>
  44 #include <string.h>
  45 #include <rpc/types.h>
  46 #include <rpc/xdr.h>
  47 #include <libintl.h>
  48 #include <limits.h>
  49
  50 #ifdef USE_IN_LIBIO
  51 # include <wchar.h>
  52 #endif
  53
  54 #define LASTUNSIGNED    ((u_int)0-1)
  55
  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 (xdrs, addrp, sizep, maxsize, elsize, elproc)
  66      XDR *xdrs;
  67      caddr_t *addrp;            /* array pointer */
  68      u_int *sizep;              /* number of elements */
  69      u_int maxsize;             /* max numberof elements */
  70      u_int elsize;              /* size in bytes of each element */
  71      xdrproc_t elproc;          /* xdr routine to handle each element */
  72 {
  73   u_int i;
  74   caddr_t target = *addrp;
  75   u_int c;              /* the actual element count */
  76   bool_t stat = TRUE;
  77
  78   /* like strings, arrays are really counted arrays */
  79   if (!INTUSE(xdr_u_int) (xdrs, sizep))
  80     {
  81       return FALSE;
  82     }
  83   c = *sizep;
  84   /*
  85    * XXX: Let the overflow possibly happen with XDR_FREE because mem_free()
  86    * doesn't actually use its second argument anyway.
  87    */
  88   if ((c > maxsize || c > UINT_MAX / elsize) && (xdrs->x_op != XDR_FREE))
  89     {
  90       return FALSE;
  91     }
  92
  93   /*
  94    * if we are deserializing, we may need to allocate an array.
  95    * We also save time by checking for a null array if we are freeing.
  96    */
  97   if (target == NULL)
  98     switch (xdrs->x_op)
  99       {
 100       case XDR_DECODE:
 101         if (c == 0)
 102           return TRUE;
 103         *addrp = target = calloc (c, elsize);
 104         if (target == NULL)
 105           {
 106             (void) __fxprintf (NULL, "%s", _("xdr_array: out of memory\n"));
 107             return FALSE;
 108           }
 109         break;
 110
 111       case XDR_FREE:
 112         return TRUE;
 113       default:
 114         break;
 115       }
 116
 117   /*
 118    * now we xdr each element of array
 119    */
 120   for (i = 0; (i < c) && stat; i++)
 121     {
 122       stat = (*elproc) (xdrs, target, LASTUNSIGNED);
 123       target += elsize;
 124     }
 125
 126   /*
 127    * the array may need freeing
 128    */
 129   if (xdrs->x_op == XDR_FREE)
 130     {
 131       mem_free (*addrp, c * elsize);
 132       *addrp = NULL;
 133     }
 134   return stat;
 135 }
 136 INTDEF(xdr_array)
 137
 138 /*
 139  * xdr_vector():
 140  *
 141  * XDR a fixed length array. Unlike variable-length arrays,
 142  * the storage of fixed length arrays is static and unfreeable.
 143  * > basep: base of the array
 144  * > size: size of the array
 145  * > elemsize: size of each element
 146  * > xdr_elem: routine to XDR each element
 147  */
 148 bool_t
 149 xdr_vector (xdrs, basep, nelem, elemsize, xdr_elem)
 150      XDR *xdrs;
 151      char *basep;
 152      u_int nelem;
 153      u_int elemsize;
 154      xdrproc_t xdr_elem;
 155 {
 156   u_int i;
 157   char *elptr;
 158
 159   elptr = basep;
 160   for (i = 0; i < nelem; i++)
 161     {
 162       if (!(*xdr_elem) (xdrs, elptr, LASTUNSIGNED))
 163         {
 164           return FALSE;
 165         }
 166       elptr += elemsize;
 167     }
 168   return TRUE;
 169 }