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/* @(#)xdr_array.c      2.1 88/07/29 4.0 RPCSRC */

/*

 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for

 * unrestricted use provided that this legend is included on all tape

 * media and as a part of the software program in whole or part.  Users

 * may copy or modify Sun RPC without charge, but are not authorized

 * to license or distribute it to anyone else except as part of a product or

 * program developed by the user.

 *

 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE

 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.

 *

 * Sun RPC is provided with no support and without any obligation on the

 * part of Sun Microsystems, Inc. to assist in its use, correction,

 * modification or enhancement.

 *

 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE

 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC

 * OR ANY PART THEREOF.

 *

 * In no event will Sun Microsystems, Inc. be liable for any lost revenue

 * or profits or other special, indirect and consequential damages, even if

 * Sun has been advised of the possibility of such damages.

 *

 * Sun Microsystems, Inc.

 * 2550 Garcia Avenue

 * Mountain View, California  94043

 */

#if 0

static char sccsid[] = "@(#)xdr_array.c 1.10 87/08/11 Copyr 1984 Sun Micro";

#endif

/*

 * xdr_array.c, Generic XDR routines implementation.

 *

 * Copyright (C) 1984, Sun Microsystems, Inc.

 *

 * These are the "non-trivial" xdr primitives used to serialize and de-serialize

 * arrays.  See xdr.h for more info on the interface to xdr.

 */

#define __FORCE_GLIBC

#define _GNU_SOURCE

#include <features.h>

#include <stdio.h>

#include <string.h>

#include <rpc/types.h>

#include <rpc/xdr.h>

#include <limits.h>

#ifdef USE_IN_LIBIO

# include <wchar.h>

#endif

#define LASTUNSIGNED    ((u_int)0-1)

/*

 * XDR an array of arbitrary elements

 * *addrp is a pointer to the array, *sizep is the number of elements.

 * If addrp is NULL (*sizep * elsize) bytes are allocated.

 * elsize is the size (in bytes) of each element, and elproc is the

 * xdr procedure to call to handle each element of the array.

 */

bool_t

xdr_array (xdrs, addrp, sizep, maxsize, elsize, elproc)

     XDR *xdrs;

     caddr_t *addrp;            /* array pointer */

     u_int *sizep;              /* number of elements */

     u_int maxsize;             /* max numberof elements */

     u_int elsize;              /* size in bytes of each element */

     xdrproc_t elproc;          /* xdr routine to handle each element */

{

  u_int i;

  caddr_t target = *addrp;

  u_int c;              /* the actual element count */

  bool_t stat = TRUE;

  u_int nodesize;

  /* like strings, arrays are really counted arrays */

  if (!xdr_u_int (xdrs, sizep))

    {

      return FALSE;

    }

  c = *sizep;

  /*

   * XXX: Let the overflow possibly happen with XDR_FREE because mem_free()

   * doesn't actually use its second argument anyway.

   */

  if ((c > maxsize || c > UINT_MAX / elsize) && (xdrs->x_op != XDR_FREE))

    {

      return FALSE;

    }

  nodesize = c * elsize;

  /*

   * if we are deserializing, we may need to allocate an array.

   * We also save time by checking for a null array if we are freeing.

   */

  if (target == NULL)

    switch (xdrs->x_op)

      {

      case XDR_DECODE:

        if (c == 0)

          return TRUE;

        *addrp = target = mem_alloc (nodesize);

        if (target == NULL)

          {

#ifdef USE_IN_LIBIO

            if (_IO_fwide (stderr, 0) > 0)

              (void) __fwprintf (stderr, L"%s",

                                 _("xdr_array: out of memory\n"));

            else

#endif

              (void) fputs (_("xdr_array: out of memory\n"), stderr);

            return FALSE;

          }

        bzero (target, nodesize);

        break;

      case XDR_FREE:

        return TRUE;

      default:

        break;

      }

  /*

   * now we xdr each element of array

   */

  for (i = 0; (i < c) && stat; i++)

    {

      stat = (*elproc) (xdrs, target, LASTUNSIGNED);

      target += elsize;

    }

  /*

   * the array may need freeing

   */

  if (xdrs->x_op == XDR_FREE)

    {

      mem_free (*addrp, nodesize);

      *addrp = NULL;

    }

  return stat;

}

/*

 * xdr_vector():

 *

 * XDR a fixed length array. Unlike variable-length arrays,

 * the storage of fixed length arrays is static and unfreeable.

 * > basep: base of the array

 * > size: size of the array

 * > elemsize: size of each element

 * > xdr_elem: routine to XDR each element

 */

bool_t

xdr_vector (xdrs, basep, nelem, elemsize, xdr_elem)

     XDR *xdrs;

     char *basep;

     u_int nelem;

     u_int elemsize;

     xdrproc_t xdr_elem;

{

  u_int i;

  char *elptr;

  elptr = basep;

  for (i = 0; i < nelem; i++)

    {

      if (!(*xdr_elem) (xdrs, elptr, LASTUNSIGNED))

        {

          return FALSE;

        }

      elptr += elemsize;

    }

  return TRUE;

}