callback.c

#include <stdio.h>
#include "callback.h"

callback_s callback[EVENT_MAX] = { { { NULL }, 0 } };

void callback_register( event_t event, callback_t cb_fn )
{
	int count = 0;
	
	if(event >= EVENT_0 && event < EVENT_MAX)
	{
		for(count=0; count<REGISTER_NUM_MAX; count++)
		{
			if(callback[event].cb[count] == NULL)
			{
				if(cb_fn)
				{
					callback[event].cb[callback[event].count++] = cb_fn;
					printf("[SUCCESS] event [%d] has been registered [%d] times \r\n", event, callback[event].count);
				}
				else
				{
					printf("[WARNING] event [%d] callback function can not be NULL \r\n", event);
				}
				break;
			}
		}
		if(count == REGISTER_NUM_MAX)
		{
			printf("[FORBIDDEN] the callback functions register count of this event [%d] has been up to max \r\n", event);
		}
	}
	else
	{
		printf("[ERROR] illegal event [%d] \r\n", event);
	}
}

void callback_execute( event_t event )
{
	int count = 0;

	if(event >= EVENT_0 && event < EVENT_MAX)		
	{
		for(count=0; count<REGISTER_NUM_MAX; count++)
		{
			if(callback[event].cb[count])
			{
				callback[event].cb[count](NULL);
			}	
		}
	}
	else
	{
		printf("[ERROR] illegal event [%d] \r\n", event);
	}	
}

void callback_unregister( event_t event, callback_t cb_fn )
{
	int count = 0;
	
	if(event >= EVENT_0 && event < EVENT_MAX)
	{
		for(count=0; count<REGISTER_NUM_MAX; count++)
		{
			if(callback[event].cb[count] == cb_fn && cb_fn)
			{
				callback[event].cb[count] = NULL;
				callback[event].count--;
				printf("[SUCCESS] event [%d] has been registered [%d] times \r\n", event, callback[event].count);
				break;
			}
			else if(cb_fn == NULL)
			{
				printf("[WARNING] the callback function can not be NULL \r\n");
				break;
			}
		}
		if(count == REGISTER_NUM_MAX)
		{
			printf("[WARNING] the callback function is not registered \r\n");
		}
	}
	else
	{
		printf("[ERROR] illegal event [%d] \r\n", event);
	}
}