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
  49 #ifdef USE_IN_LIBIO
  50 # include <wchar.h>
  51 #endif
  52
  53 #define LASTUNSIGNED    ((u_int)0-1)
  54
  55
  56 /*
  57  * XDR an array of arbitrary elements
  58  * *addrp is a pointer to the array, *sizep is the number of elements.
  59  * If addrp is NULL (*sizep * elsize) bytes are allocated.
  60  * elsize is the size (in bytes) of each element, and elproc is the
  61  * xdr procedure to call to handle each element of the array.
  62  */
  63 bool_t
  64 xdr_array (xdrs, addrp, sizep, maxsize, elsize, elproc)
  65      XDR *xdrs;
  66      caddr_t *addrp;            /* array pointer */
  67      u_int *sizep;              /* number of elements */
  68      u_int maxsize;             /* max numberof elements */
  69      u_int elsize;              /* size in bytes of each element */
  70      xdrproc_t elproc;          /* xdr routine to handle each element */
  71 {
  72   u_int i;
  73   caddr_t target = *addrp;
  74   u_int c;              /* the actual element count */
  75   bool_t stat = TRUE;
  76   u_int nodesize;
  77
  78   /* like strings, arrays are really counted arrays */
  79   if (!xdr_u_int (xdrs, sizep))
  80     {
  81       return FALSE;
  82     }
  83   c = *sizep;
  84   if ((c > maxsize) && (xdrs->x_op != XDR_FREE))
  85     {
  86       return FALSE;
  87     }
  88   nodesize = c * elsize;
  89
  90   /*
  91    * if we are deserializing, we may need to allocate an array.
  92    * We also save time by checking for a null array if we are freeing.
  93    */
  94   if (target == NULL)
  95     switch (xdrs->x_op)
  96       {
  97       case XDR_DECODE:
  98         if (c == 0)
  99           return TRUE;
 100         *addrp = target = mem_alloc (nodesize);
 101         if (target == NULL)
 102           {
 103 #ifdef USE_IN_LIBIO
 104             if (_IO_fwide (stderr, 0) > 0)
 105               (void) __fwprintf (stderr, L"%s",
 106                                  _("xdr_array: out of memory\n"));
 107             else
 108 #endif
 109               (void) fputs (_("xdr_array: out of memory\n"), stderr);
 110             return FALSE;
 111           }
 112         __bzero (target, nodesize);
 113         break;
 114
 115       case XDR_FREE:
 116         return TRUE;
 117       default:
 118         break;
 119       }
 120
 121   /*
 122    * now we xdr each element of array
 123    */
 124   for (i = 0; (i < c) && stat; i++)
 125     {
 126       stat = (*elproc) (xdrs, target, LASTUNSIGNED);
 127       target += elsize;
 128     }
 129
 130   /*
 131    * the array may need freeing
 132    */
 133   if (xdrs->x_op == XDR_FREE)
 134     {
 135       mem_free (*addrp, nodesize);
 136       *addrp = NULL;
 137     }
 138   return stat;
 139 }
 140
 141 /*
 142  * xdr_vector():
 143  *
 144  * XDR a fixed length array. Unlike variable-length arrays,
 145  * the storage of fixed length arrays is static and unfreeable.
 146  * > basep: base of the array
 147  * > size: size of the array
 148  * > elemsize: size of each element
 149  * > xdr_elem: routine to XDR each element
 150  */
 151 bool_t
 152 xdr_vector (xdrs, basep, nelem, elemsize, xdr_elem)
 153      XDR *xdrs;
 154      char *basep;
 155      u_int nelem;
 156      u_int elemsize;
 157      xdrproc_t xdr_elem;
 158 {
 159   u_int i;
 160   char *elptr;
 161
 162   elptr = basep;
 163   for (i = 0; i < nelem; i++)
 164     {
 165       if (!(*xdr_elem) (xdrs, elptr, LASTUNSIGNED))
 166         {
 167           return FALSE;
 168         }
 169       elptr += elemsize;
 170     }
 171   return TRUE;
 172 }