usr/src/lib/libast/common/cdt/dtnew.c

   1 /***********************************************************************
   2 *                                                                      *
   3 *               This software is part of the ast package               *
   4 *          Copyright (c) 1985-2010 AT&T Intellectual Property          *
   5 *                      and is licensed under the                       *
   6 *                  Common Public License, Version 1.0                  *
   7 *                    by AT&T Intellectual Property                     *
   8 *                                                                      *
   9 *                A copy of the License is available at                 *
  10 *            http://www.opensource.org/licenses/cpl1.0.txt             *
  11 *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
  12 *                                                                      *
  13 *              Information and Software Systems Research               *
  14 *                            AT&T Research                             *
  15 *                           Florham Park NJ                            *
  16 *                                                                      *
  17 *                 Glenn Fowler <gsf@research.att.com>                  *
  18 *                  David Korn <dgk@research.att.com>                   *
  19 *                   Phong Vo <kpv@research.att.com>                    *
  20 *                                                                      *
  21 ***********************************************************************/
  22 #pragma prototyped
  23
  24 /*
  25  * dtopen() with handle placed in specific vm region
  26  */
  27
  28 #include <dt.h>
  29
  30 typedef struct Dc_s
  31 {
  32         Dtdisc_t        ndisc;
  33         Dtdisc_t*       odisc;
  34         Vmalloc_t*      vm;
  35 } Dc_t;
  36
  37 static int
  38 eventf(Dt_t* dt, int op, void* data, Dtdisc_t* disc)
  39 {
  40         Dc_t*   dc = (Dc_t*)disc;
  41         int     r;
  42
  43         if (dc->odisc->eventf && (r = (*dc->odisc->eventf)(dt, op, data, dc->odisc)))
  44                 return r;
  45         return op == DT_ENDOPEN ? 1 : 0;
  46 }
  47
  48 static void*
  49 memoryf(Dt_t* dt, void* addr, size_t size, Dtdisc_t* disc)
  50 {
  51         return vmresize(((Dc_t*)disc)->vm, addr, size, VM_RSMOVE);
  52 }
  53
  54 /*
  55  * open a dictionary using disc->memoryf if set or vm otherwise
  56  */
  57
  58 Dt_t*
  59 dtnew(Vmalloc_t* vm, Dtdisc_t* disc, Dtmethod_t* meth)
  60 {
  61         Dt_t*           dt;
  62         Dc_t            dc;
  63
  64         dc.odisc = disc;
  65         dc.ndisc = *disc;
  66         dc.ndisc.eventf = eventf;
  67         if (!dc.ndisc.memoryf)
  68                 dc.ndisc.memoryf = memoryf;
  69         dc.vm = vm;
  70         if (dt = dtopen(&dc.ndisc, meth))
  71                 dtdisc(dt, disc, DT_SAMECMP|DT_SAMEHASH);
  72         return dt;
  73 }