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dtnew.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*                  Copyright (c) 1985-2006 AT&T Corp.                  *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                            by AT&T Corp.                             *
*                                                                      *
*                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>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped

/*
 * dtopen() with handle placed in specific vm region
 */

#include <dt.h>

typedef struct Dc_s
{
      Dtdisc_t    ndisc;
      Dtdisc_t*   odisc;
      Vmalloc_t*  vm;
} Dc_t;

static int
eventf(Dt_t* dt, int op, void* data, Dtdisc_t* disc)
{
      Dc_t* dc = (Dc_t*)disc;
      int   r;

      if (dc->odisc->eventf && (r = (*dc->odisc->eventf)(dt, op, data, dc->odisc)))
            return r;
      return op == DT_ENDOPEN ? 1 : 0;
}

static void*
memoryf(Dt_t* dt, void* addr, size_t size, Dtdisc_t* disc)
{
      return vmresize(((Dc_t*)disc)->vm, addr, size, VM_RSMOVE);
}

/*
 * open a dictionary using disc->memoryf if set or vm otherwise
 */

Dt_t*
dtnew(Vmalloc_t* vm, Dtdisc_t* disc, Dtmethod_t* meth)
{
      Dt_t*       dt;
      Dc_t        dc;

      dc.odisc = disc;
      dc.ndisc = *disc;
      dc.ndisc.eventf = eventf;
      if (!dc.ndisc.memoryf)
            dc.ndisc.memoryf = memoryf;
      dc.vm = vm;
      if (dt = dtopen(&dc.ndisc, meth))
            dtdisc(dt, disc, DT_SAMECMP|DT_SAMEHASH);
      return dt;
}

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