/*-
 * LstDestroy.c --
 *	Nuke a list and all its resources
 *
 * Copyright (c) 1988 by University of California Regents
 *
 * Permission to use, copy, modify, and distribute this
 * software and its documentation for any purpose and without
 * fee is hereby granted, provided that the above copyright
 * notice appears in all copies.  Neither the University of California nor
 * Adam de Boor makes any representations about the suitability of this
 * software for any purpose.  It is provided "as is" without
 * express or implied warranty.
 */
#ifndef lint
static char *rcsid =
"$Id: lstDestroy.c,v 1.5 88/11/17 20:52:15 adam Exp $ SPRITE (Berkeley)";
#endif lint

#include	"lstInt.h"

/*-
 *-----------------------------------------------------------------------
 * Lst_Destroy --
 *	Destroy a list and free all its resources. If the freeProc is
 *	given, it is called with the datum from each node in turn before
 *	the node is freed.
 *
 * Results:
 *	None.
 *
 * Side Effects:
 *	The given list is freed in its entirety.
 *
 *-----------------------------------------------------------------------
 */
void
Lst_Destroy (l, freeProc)
    Lst	    	  	l;
    register void	(*freeProc)();
{
    register ListNode	ln;
    register ListNode	tln = NilListNode;
    register List 	list = (List)l;
    
    if (l == NILLST || ! l) {
	/*
	 * Note the check for l == (Lst)0 to catch uninitialized static Lst's.
	 * Gross, but useful.
	 */
	return;
    }
    
    if (freeProc) {
	for (ln = list->firstPtr;
	     ln != NilListNode && tln != list->firstPtr;
	     ln = tln) {
		 tln = ln->nextPtr;
		 (*freeProc) (ln->datum);
		 free ((Address)ln);
	}
    } else {
	for (ln = list->firstPtr;
	     ln != NilListNode && tln != list->firstPtr;
	     ln = tln) {
		 tln = ln->nextPtr;
		 free ((Address)ln);
	}
    }
    
    free ((Address)l);
}