fuzzy-then-d.c

/* fuzzy-then-d.c -- calculate fuzzy logic value with delta function
 * Copyright (C) 2014 Sergei Ianovich <ynvich@gmail.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#include "includes.h"

#include <stdio.h>

#include "block.h"
#include "fuzzy-then-d.h"
#include "map.h"
#include "state.h"

#define PCS_BLOCK	"fuzzy-then-d"

struct fuzzy_then_d_state {
	long			*input;
	long			a;
	long			b;
	long			c;
};

static void
fuzzy_then_d_run(struct block *b, struct server_state *s)
{
	struct fuzzy_then_d_state *d = b->data;
	long h = *d->input;
	unsigned long z;

	if (h > 0x10000)
		h = 0x10000;
	else if (h < 0)
		h = 0;

	b->outputs[0] = (d->a + d->c) / 2;;

	z = 0x20000 - h;
	z /= 2;
	z *= h;
	z /= 0x1000000;
	z *= (d->c - d->a);
	b->outputs[1] = (long) z;
}

static void
set_input(void *data, const char const *key, long *input)
{
	struct fuzzy_then_d_state *d = data;
	d->input = input;
}

static int
set_a(void *data, const char const *key, long value)
{
	struct fuzzy_then_d_state *d = data;
	d->a = value;
	debug("a = %li\n", d->a);
	return 0;
}

static int
set_b(void *data, const char const *key, long value)
{
	struct fuzzy_then_d_state *d = data;
	d->b = value;
	if (d->a > d->b) {
		error(PCS_BLOCK ": b cannot be less than a, set a first\n");
		return 1;
	}
	debug("b = %li\n", d->b);
	return 0;
}

static int
set_c(void *data, const char const *key, long value)
{
	struct fuzzy_then_d_state *d = data;
	d->c = value;
	if (d->b > d->c) {
		error(PCS_BLOCK ": c cannot be less than b, set b first\n");
		return 1;
	}
	if (2 * d->b != (d->a + d->c)) {
		error(PCS_BLOCK ": only symmetrical delta is supported\n");
		return 1;
	}
	debug("c = %li\n", d->c);
	return 0;
}

static const char *outputs[] = {
	"value",
	"weight",
	NULL
};

static struct pcs_map inputs[] = {
	{
		.key			= NULL,
		.value			= set_input,
	}
};

static struct pcs_map setpoints[] = {
	{
		.key			= "a",
		.value			= set_a,
	}
	,{
		.key			= "b",
		.value			= set_b,
	}
	,{
		.key			= "c",
		.value			= set_c,
	}
	,{
	}
};

static void *
alloc(void)
{
	struct fuzzy_then_d_state *d = xzalloc(sizeof(*d));
	return d;
}

static struct block_ops ops = {
	.run		= fuzzy_then_d_run,
};

static struct block_ops *
init(struct block *b)
{
	return &ops;
}

static struct block_builder builder = {
	.alloc		= alloc,
	.ops		= init,
	.outputs	= outputs,
	.inputs		= inputs,
	.setpoints	= setpoints,
};

struct block_builder *
load_fuzzy_then_d_builder(void)
{
	return &builder;
}