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dtopen.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2008 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                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"
static char*     Version = "\n@(#)$Id: cdt (AT&T Research) 2005-04-20 $\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->type = DT_MALLOC;
      dt->nview = 0;
      dt->view = dt->walk = NIL(Dt_t*);
      dt->user = NIL(Void_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)
                  goto err_open;
            else if(e > 0)
            {     if(data)
                  {     if(data->type&meth->type)
                              goto done;
                        else  goto err_open;
                  }

                  if(!disc->memoryf)
                        goto err_open;

                  free((Void_t*)dt);
                  if(!(dt = (*disc->memoryf)(0, 0, sizeof(Dt_t), disc)) )
                        return NIL(Dt_t*);
                  dt->searchf = NIL(Dtsearch_f);
                  dt->meth = NIL(Dtmethod_t*);
                  dt->disc = NIL(Dtdisc_t*);
                  dtdisc(dt,disc,0);
                  dt->type = DT_MEMORYF;
                  dt->nview = 0;
                  dt->view = dt->walk = NIL(Dt_t*);
            }
      }

      /* allocate sharable data */
      if(!(data = (Dtdata_t*)(dt->memoryf)(dt,NIL(Void_t*),sizeof(Dtdata_t),disc)) )
      { err_open:
            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;
      data->minp = 0;

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

      if(disc->eventf)
            (*disc->eventf)(dt, DT_ENDOPEN, (Void_t*)dt, disc);

      return dt;
}

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