/* $Copyright:	$
 * Copyright (c) 1984, 1985, 1986, 1987, 1988, 1989, 1990 
 * Sequent Computer Systems, Inc.   All rights reserved.
 *  
 * This software is furnished under a license and may be used
 * only in accordance with the terms of that license and with the
 * inclusion of the above copyright notice.   This software may not
 * be provided or otherwise made available to, or used by, any
 * other person.  No title to or ownership of the software is
 * hereby transferred.
 */

#ifndef	lint
static char rcsid[] = "$Header: xdr_array.c 1.2 88/03/14 $";
#endif

/* NFSSRC @(#)xdr_array.c	2.1 86/04/14 */
#ifndef lint
static char sccsid[] = "@(#)xdr_array.c 1.1 86/02/03 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 <rpc/types.h>
#include <rpc/xdr.h>
#include <stdio.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 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 = mem_alloc(nodesize);
			if (target == NULL) {
				fprintf(stderr, "xdr_array: out of memory\n");
				return (FALSE);
			}
			bzero(target, (u_int)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);
}
