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/*
* Copyright (c) 1997-1998 University of Utah and the Flux Group.
* All rights reserved.
*
* This file is part of the Flux OSKit. The OSKit is free software, also known
* as "open source;" you can redistribute it and/or modify it under the terms
* of the GNU General Public License (GPL), version 2, as published by the Free
* Software Foundation (FSF). To explore alternate licensing terms, contact
* the University of Utah at csl-dist@cs.utah.edu or +1-801-585-3271.
*
* The OSKit is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GPL for more details. You should have
* received a copy of the GPL along with the OSKit; see the file COPYING. If
* not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
*/
/* A simple adaptor to implement a callback using oskit_listener's. */
#include <oskit/com.h>
#include <oskit/com/listener.h>
#include <oskit/c/stdio.h>
#include <oskit/c/stdlib.h>
#include <oskit/c/string.h>
typedef struct listener_impl {
oskit_listener_t iol; /* COM interface */
unsigned count; /* reference count */
oskit_listener_callback_t cb; /* callback */
void *arg; /* and its argument */
} listener_impl_t;
static OSKIT_COMDECL
listener_query(oskit_listener_t *io, const oskit_iid_t *iid, void **out_ihandle)
{
listener_impl_t *li = (listener_impl_t *)io;
if (memcmp(iid, &oskit_iunknown_iid, sizeof(*iid)) == 0 ||
memcmp(iid, &oskit_listener_iid, sizeof(*iid)) == 0) {
*out_ihandle = &li->iol;
++li->count;
return 0;
}
*out_ihandle = NULL;
return OSKIT_E_NOINTERFACE;
}
static OSKIT_COMDECL_U
listener_addref(oskit_listener_t *io)
{
listener_impl_t *li = (listener_impl_t *)io;
if (li->count == 0)
return OSKIT_E_INVALIDARG;
return ++li->count;
}
static OSKIT_COMDECL_U
listener_release(oskit_listener_t *io)
{
listener_impl_t *li = (listener_impl_t *)io;
unsigned newcount;
if (li == NULL || li->count == 0)
return OSKIT_E_INVALIDARG;
newcount = --li->count;
if (newcount == 0) {
free(li);
}
return newcount;
}
/* ARGSUSED */
static OSKIT_COMDECL
listener_notify(oskit_listener_t *io, oskit_iunknown_t *obj)
{
listener_impl_t *li = (listener_impl_t *)io;
return li->cb(obj, li->arg);
}
static struct oskit_listener_ops oskit_listener_ops = {
listener_query,
listener_addref,
listener_release,
listener_notify
};
oskit_listener_t *
oskit_create_listener(oskit_listener_callback_t handler, void *arg)
{
listener_impl_t *li = malloc(sizeof *li);
if (li == 0)
return 0;
memset(li, 0, sizeof *li);
li->cb = handler;
li->arg = arg;
li->iol.ops = &oskit_listener_ops;
li->count = 1;
return &li->iol;
}
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