dtsize.c   [plain text]

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*           Copyright (c) 1985-2007 AT&T Knowledge Ventures            *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                      by AT&T Knowledge Ventures                      *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#include	"dthdr.h"

/*	Return the # of objects in the dictionary
**
**	Written by Kiem-Phong Vo (5/25/96)
*/

#if __STD_C
static int treecount(reg Dtlink_t* e)
#else
static int treecount(e)
reg Dtlink_t*	e;
#endif
{	return e ? treecount(e->left) + treecount(e->right) + 1 : 0;
}

#if __STD_C
int dtsize(Dt_t* dt)
#else
int dtsize(dt)
Dt_t*	dt;
#endif
{
	reg Dtlink_t*	t;
	reg int		size;

	UNFLATTEN(dt);

	if(dt->data->size < 0) /* !(dt->data->type&(DT_SET|DT_BAG)) */
	{	if(dt->data->type&(DT_OSET|DT_OBAG))
			dt->data->size = treecount(dt->data->here);
		else if(dt->data->type&(DT_LIST|DT_STACK|DT_QUEUE))
		{	for(size = 0, t = dt->data->head; t; t = t->right)
				size += 1;
			dt->data->size = size;
		}
	}

	return dt->data->size;
}