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
eventf(Dt_t * dt,int op,void * data,Dtdisc_t * disc)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*
memoryf(Dt_t * dt,void * addr,size_t size,Dtdisc_t * disc)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*
dtnew(Vmalloc_t * vm,Dtdisc_t * disc,Dtmethod_t * meth)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 }
74