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xdr_var_array.c

/*
 *   DIS/x : An implementation of the IEEE 1278.1 protocol
 *
 *   Copyright (C) 1996, Riley Rainey (rainey@netcom.com)
 *
 *   This library is free software; you can redistribute it and/or
 *   modify it under the terms of either:
 *
 *   a) the GNU Library General Public License as published by the Free
 *   Software Foundation; either version 2 of the License, or (at your
 *   option) any later version.  A description of the terms and conditions
 *   of the GLPL may be found in the "COPYING.LIB" file.
 *
 *   b) the "Artistic License" which comes with this Kit.  Information
 *   about this license may be found in the "Artistic" file.
 *
 *   This library is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *   Library General Public License or the Artistic License for more details.
 *
 *   You should have received a copy of the GNU Library General Public
 *   License along with this library; if not, write to the Free
 *   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *   Information describing how to contact the author can be found in the
 *   README file.
 */
/*
 * 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 defined(LIBC_SCCS) && !defined(lint)
/*static char *sccsid = "from: @(#)xdr_array.c 1.10 87/08/11 Copyr 1984 Sun Micro"; */
/*static char *sccsid = "from: @(#)xdr_array.c  2.1 88/07/29 4.0 RPCSRC"; */
static char *rcsid = "$Id: xdr_var_array.c,v 1.2 1998/05/12 03:58:55 riley Exp $";

#endif

/*
 * xdr_var_array.c from :
 *
 * 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.
 */

#include <stdio.h>
#include <stdlib.h>
#include <rpc/types.h>
#include <rpc/xdr.h>

#define LASTUNSIGNED    ((u_int)0-1)

extern int fprintf(FILE *, const char *,...);

/*
 * XDR an array of arbitrary elements
 * *addrp is a pointer to the array, size 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_var_array(register XDR * xdrs, caddr_t * addrp, u_int size, u_int maxsize, u_int elsize, xdrproc_t elproc)
                        /* array pointer */
                        /* number of elements */
                        /* max numberof elements */
                        /* size in bytes of each element */
                        /* xdr routine to handle each element */
{
      register u_int i;
      register caddr_t target = *addrp;
      register u_int c;             /* the actual element count */
      register bool_t stat = TRUE;
      register u_int nodesize;

      c = size;
      if ((c > maxsize) && (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.
       *
       * * Always allocate storage when decoding. *
       */
      if (target == NULL || xdrs->x_op == XDR_DECODE)
            switch (xdrs->x_op) {
            case XDR_DECODE:
                  if (c == 0)
                        return (TRUE);
                  *addrp = target = mem_alloc(nodesize);
                  if (target == NULL) {
                        (void) fprintf(stderr,
                                             "xdr_array: out of memory\n");
                        return (FALSE);
                  }
                  bzero(target, nodesize);
                  break;

            case XDR_FREE:
                  return (TRUE);

            case XDR_ENCODE:
                  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);
}

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