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eb5e0673 RK |
1 | /* |
2 | * This file is part of DisOrder | |
3 | * Copyright (C) 2008 Richard Kettlewell | |
4 | * | |
e7eb3a27 | 5 | * This program is free software: you can redistribute it and/or modify |
eb5e0673 | 6 | * it under the terms of the GNU General Public License as published by |
e7eb3a27 | 7 | * the Free Software Foundation, either version 3 of the License, or |
eb5e0673 | 8 | * (at your option) any later version. |
e7eb3a27 RK |
9 | * |
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. | |
14 | * | |
eb5e0673 | 15 | * You should have received a copy of the GNU General Public License |
e7eb3a27 | 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
eb5e0673 | 17 | */ |
132a5a4a RK |
18 | /** @file lib/eventdist.c |
19 | * @brief Event distribution | |
20 | */ | |
eb5e0673 RK |
21 | #include "common.h" |
22 | ||
23 | #include "mem.h" | |
24 | #include "eventdist.h" | |
25 | #include "hash.h" | |
26 | ||
27 | struct event_data { | |
28 | struct event_data *next; | |
29 | const char *event; | |
30 | event_handler *callback; | |
31 | void *callbackdata; | |
32 | }; | |
33 | ||
34 | static hash *events; | |
35 | ||
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()) | |
41 | */ | |
42 | event_handle event_register(const char *event, | |
43 | event_handler *callback, | |
44 | void *callbackdata) { | |
45 | static const struct event_data *null; | |
46 | struct event_data *ed = xmalloc(sizeof *ed), **head; | |
47 | ||
48 | if(!events) | |
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); | |
53 | } | |
54 | ed->next = *head; | |
55 | ed->event = xstrdup(event); | |
56 | ed->callback = callback; | |
57 | ed->callbackdata = callbackdata; | |
58 | *head = ed; | |
59 | return ed; | |
60 | } | |
61 | ||
62 | /** @brief Stop handling an event | |
63 | * @param handle Registration to cancel (as returned from event_register()) | |
64 | * | |
65 | * @p handle is allowed to be NULL. | |
66 | */ | |
67 | void event_cancel(event_handle handle) { | |
68 | struct event_data **head, **edp; | |
69 | ||
70 | if(!handle) | |
71 | return; | |
72 | assert(events); | |
73 | head = hash_find(events, handle->event); | |
74 | for(edp = head; *edp && *edp != handle; edp = &(*edp)->next) | |
75 | ; | |
76 | assert(*edp == handle); | |
77 | *edp = handle->next; | |
78 | } | |
79 | ||
80 | /** @brief Raise an event | |
81 | * @param event Event type to raise | |
82 | * @param eventdata Event-specific data | |
83 | */ | |
84 | void event_raise(const char *event, | |
85 | void *eventdata) { | |
86 | struct event_data *ed, **head; | |
87 | if(!events) | |
88 | return; | |
89 | if(!(head = hash_find(events, event))) | |
90 | return; | |
91 | for(ed = *head; ed; ed = ed->next) | |
92 | ed->callback(event, eventdata, ed->callbackdata); | |
93 | } | |
94 | ||
95 | /* | |
96 | Local Variables: | |
97 | c-basic-offset:2 | |
98 | comment-column:40 | |
99 | fill-column:79 | |
100 | indent-tabs-mode:nil | |
101 | End: | |
102 | */ |