2 * This file is part of DisOrder
3 * Copyright (C) 2008 Richard Kettlewell
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 /** @file lib/eventdist.c
19 * @brief Event distribution
24 #include "eventdist.h"
28 struct event_data
*next
;
30 event_handler
*callback
;
36 /** @brief Register an event handler
37 * @param event Event type to handle
38 * @param callback Function to call when event occurs
39 * @param callbackdata Passed to @p callback
40 * @return Handle for this registration (for use with event_cancel())
42 event_handle
event_register(const char *event
,
43 event_handler
*callback
,
45 static const struct event_data
*null
;
46 struct event_data
*ed
= xmalloc(sizeof *ed
), **head
;
49 events
= hash_new(sizeof (struct event_data
*));
50 if(!(head
= hash_find(events
, event
))) {
51 hash_add(events
, event
, &null
, HASH_INSERT
);
52 head
= hash_find(events
, event
);
55 ed
->event
= xstrdup(event
);
56 ed
->callback
= callback
;
57 ed
->callbackdata
= callbackdata
;
62 /** @brief Stop handling an event
63 * @param handle Registration to cancel (as returned from event_register())
65 * @p handle is allowed to be NULL.
67 void event_cancel(event_handle handle
) {
68 struct event_data
**head
, **edp
;
73 head
= hash_find(events
, handle
->event
);
74 for(edp
= head
; *edp
&& *edp
!= handle
; edp
= &(*edp
)->next
)
76 assert(*edp
== handle
);
80 /** @brief Raise an event
81 * @param event Event type to raise
82 * @param eventdata Event-specific data
84 void event_raise(const char *event
,
86 struct event_data
*ed
, **head
;
89 if(!(head
= hash_find(events
, event
)))
91 for(ed
= *head
; ed
; ed
= ed
->next
)
92 ed
->callback(event
, eventdata
, ed
->callbackdata
);