Merge branch 'master' into cmdline_edit

[z180-stamp.git] / avr / background.c

/*
 * (C) Copyright 2014 Leo C. <erbl259-lmu@yahoo.de>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include "common.h"
#include "background.h"


#define BG_FUNC_MAX 5

static struct {
	bg_func fct;
	int param;
} func_tab[BG_FUNC_MAX];

static int_fast8_t fcount;

int bg_register(bg_func f, int initval)
{
	if (fcount < BG_FUNC_MAX) {
		func_tab[fcount].fct = f;
		func_tab[fcount].param = initval;
		return ++fcount - 1;
	}
	return -1;
}

int bg_setstat(int handle, int val)
{
	if (handle < fcount) {
		func_tab[handle].param = val;
		return 1;
	}

	return 0;
}


int bg_getstat(int handle)
{
	if (handle < fcount) {
		return func_tab[handle].param;
	}
	return 0;
}


void bg_shed(void)
{
	static int_fast8_t current;

	if (func_tab[current].fct) {
		int v = func_tab[current].fct(func_tab[current].param);
		func_tab[current].param = v;
	}
	if (++current >= fcount)
		current = 0;
}