text: /* @(#)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.
   * 
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   * part of Sun Microsystems, Inc. to assist in its use, correction,
   * modification or enhancement.
   * 
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   * 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(lint) && defined(SCCSIDS)
  static char sccsid[] = "@(#)xdr_array.c 1.10 87/08/11 Copyr 1984 Sun Micro";
  #endif
  
  /*
   * xdr_array.c, Generic XDR routines impelmentation.
   *
   * 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 <rpc/types.h>
  #include <rpc/xdr.h>
  
  #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)
  	register 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 */
  {
  	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;
  
  	/* like strings, arrays are really counted arrays */
  	if (! xdr_u_int(xdrs, sizep)) {
  		return (FALSE);
  	}
  	c = *sizep;
  	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.
  	 */
  	if (target == NULL)
  		switch (xdrs->x_op) {
  		case XDR_DECODE:
  			if (c == 0)
  				return (TRUE);
  			*addrp = target = (caddr_t) 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);
  	}
  	
  	/*
  	 * 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)
  	register XDR *xdrs;
  	register char *basep;
  	register u_int nelem;
  	register u_int elemsize;
  	register xdrproc_t xdr_elem;	
  {
  	register u_int i;
  	register char *elptr;
  
  	elptr = basep;
  	for (i = 0; i < nelem; i++) {
  		if (! (*xdr_elem)(xdrs, elptr, LASTUNSIGNED)) {
  			return(FALSE);
  		}
  		elptr += elemsize;
  	}
  	return(TRUE);	
  }
  
  