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