e180e45e01
check for invalid userdata by assigning the address of 'invalid_userdata' this cleans up the functions a bit and removes some extra conditionals Change-Id: Ic5e13147796e629010a1436eb60042f6550a959c
128 lines
3.8 KiB
C
128 lines
3.8 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2008 by Miika Pekkarinen
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include <stdio.h>
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#include "events.h"
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#include "panic.h"
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#define MAX_SYS_EVENTS 28
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struct sysevent {
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unsigned short id;
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bool oneshot;
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union {
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void (*cb)(unsigned short id, void *event_data);
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void (*cb_ex)(unsigned short id, void *event_data, void *user_data);
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} handler;
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void *user_data;
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};
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static struct sysevent events[MAX_SYS_EVENTS];
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static int invalid_userdata;
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static bool do_add_event(unsigned short id, bool oneshot,
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void *handler, void *user_data)
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{
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size_t free = MAX_SYS_EVENTS;
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struct sysevent *ev;
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/* Check if the event already exists. & lowest free slot available */
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for (size_t i = MAX_SYS_EVENTS - 1; i < MAX_SYS_EVENTS; i--)
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{
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ev = &events[i];
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if (ev->handler.cb == NULL)
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free = i;
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if (ev->id == id && ev->handler.cb == handler && user_data == ev->user_data)
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{
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return false;
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}
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}
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/* is there a free slot? */
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if (free < MAX_SYS_EVENTS)
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{
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ev = &events[free];
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ev->id = id;
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ev->handler.cb = handler;
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ev->user_data = user_data;
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ev->oneshot = oneshot;
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return true;
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}
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panicf("event line full");
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return false;
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}
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bool add_event(unsigned short id, void (*handler)(unsigned short id, void *data))
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{
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return do_add_event(id, false, handler, &invalid_userdata);
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}
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bool add_event_ex(unsigned short id, bool oneshot,
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void (*handler)(unsigned short id, void *event_data, void *user_data), void *user_data)
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{
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return do_add_event(id, oneshot, handler, user_data);
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}
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static void do_remove_event(unsigned short id, void *handler, void *user_data)
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{
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for (size_t i = 0; i < MAX_SYS_EVENTS; i++)
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{
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struct sysevent *ev = &events[i];
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if (ev->id == id && ev->handler.cb == handler && user_data == ev->user_data)
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{
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ev->handler.cb = NULL;
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return;
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}
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}
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}
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void remove_event(unsigned short id, void (*handler)(unsigned short id, void *data))
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{
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do_remove_event(id, handler, &invalid_userdata);
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}
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void remove_event_ex(unsigned short id,
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void (*handler)(unsigned short id, void *event_data, void *user_data),
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void *user_data)
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{
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do_remove_event(id, handler, user_data);
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}
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void send_event(unsigned short id, void *data)
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{
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for (size_t i = 0; i < MAX_SYS_EVENTS; i++)
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{
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struct sysevent *ev = &events[i];
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if (ev->id == id && ev->handler.cb != NULL)
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{
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if (ev->user_data != &invalid_userdata)
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{
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ev->handler.cb_ex(id, data, ev->user_data);
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if (ev->oneshot) /* only _ex events have option of oneshot */
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ev->handler.cb = NULL;
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}
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else
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ev->handler.cb(id, data);
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}
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}
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}
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