dtopen.c   [plain text]

/*
    This software may only be used by you under license from AT&T Corp.
    ("AT&T").  A copy of AT&T's Source Code Agreement is available at
    AT&T's Internet website having the URL:
    <http://www.research.att.com/sw/tools/graphviz/license/source.html>
    If you received this software without first entering into a license
    with AT&T, you have an infringing copy of this software and cannot use
    it without violating AT&T's intellectual property rights.
*/
#include	"dthdr.h"

#ifdef DMALLOC
#include "dmalloc.h"
#endif

static char*     Version = "\n@(#)cdt (AT&T Labs - kpv) 1999-11-01\0\n";

/* 	Make a new dictionary
**
**	Written by Kiem-Phong Vo (5/25/96)
*/

#if __STD_C
Dt_t* dtopen(Dtdisc_t* disc, Dtmethod_t* meth)
#else
Dt_t*	dtopen(disc, meth)
Dtdisc_t*	disc;
Dtmethod_t*	meth;
#endif
{
	Dt_t*		dt = (Dt_t*)Version;	/* shut-up unuse warning */
	reg int		e;
	Dtdata_t*	data;

	if(!disc || !meth)
		return NIL(Dt_t*);

	/* allocate space for dictionary */
	if(!(dt = (Dt_t*) malloc(sizeof(Dt_t))))
		return NIL(Dt_t*);

	/* initialize all absolutely private data */
	dt->searchf = NIL(Dtsearch_f);
	dt->meth = NIL(Dtmethod_t*);
	dt->disc = NIL(Dtdisc_t*);
	dtdisc(dt,disc,0);
	dt->nview = 0;
	dt->view = dt->walk = NIL(Dt_t*);

	if(disc->eventf)
	{	/* if shared/persistent dictionary, get existing data */
		data = NIL(Dtdata_t*);
		if((e = (*disc->eventf)(dt,DT_OPEN,(Void_t*)(&data),disc)) != 0)
		{	if(e < 0 || !data || !(data->type&meth->type) )
			{	free((Void_t*)dt);
				return NIL(Dt_t*);
			}
			else	goto done;
		}
	}

	/* allocate sharable data */
	data = (Dtdata_t*)(dt->memoryf)(dt,NIL(Void_t*),sizeof(Dtdata_t),disc);
	if(!data)
	{	free((Void_t*)dt);
		return NIL(Dt_t*);
	}
	data->type = meth->type;
	data->here = NIL(Dtlink_t*);
	data->htab = NIL(Dtlink_t**);
	data->ntab = data->size = data->loop = 0;

done:
	dt->data = data;
	dt->searchf = meth->searchf;
	dt->meth = meth;

	return dt;
}

#if __hppa

/*
 * some dll implementations forget that data symbols
 * need address resolution too
 */

#if __STD_C
int _dt_dynamic_data(void)
#else
int _dt_dynamic_data()
#endif
{
	return (Dtset != 0) + (Dtlist != 0) + (Dttree != 0);
}

#endif /* __hppa */