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