/*
 * Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Adam de Boor.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
static char sccsid[] = "@(#)lstEnQueue.c	5.2 (Berkeley) 03/11/90";
#endif /* not lint */

/*-
 * LstEnQueue.c--
 *	Treat the list as a queue and place a datum at its end
 */

#include	"lstInt.h"

/*-
 *-----------------------------------------------------------------------
 * Lst_EnQueue --
 *	Add the datum to the tail of the given list.
 *
 * Results:
 *	SUCCESS or FAILURE as returned by Lst_Append.
 *
 * Side Effects:
 *	the lastPtr field is altered all the time and the firstPtr field
 *	will be altered if the list used to be empty.
 *
 *-----------------------------------------------------------------------
 */
ReturnStatus
Lst_EnQueue (l, d)
    Lst	    	  l;
    ClientData	  d;
{
    if (LstValid (l) == FALSE) {
	return (FAILURE);
    }
    
    return (Lst_Append (l, Lst_Last(l), d));
}