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/* $Id: sig_boolean.c,v 1.29 2009-05-21 16:38:06 vrsieh Exp $
*
* Copyright (C) 2007-2009 FAUmachine Team <info@faumachine.org>.
* This program is free software. You can redistribute it and/or modify it
* under the terms of the GNU General Public License, either version 2 of
* the License, or (at your option) any later version. See COPYING.
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "fixme.h"
#include "sig_boolean.h"
static void
sig_boolean_flush(struct sig_boolean *b)
{
unsigned int nr;
unsigned int i;
for (i = 0; i < b->in_count; i++) {
void (*func)(void *, unsigned int);
unsigned int new_val;
new_val = 0;
for (nr = 0; nr < b->out_count; nr++) {
if (b->out[nr].s == b->in[i].s) continue;
new_val |= b->out[nr].out;
}
func = b->in[i].f->set_ext;
if (func
&& b->in[i].in != new_val) {
b->in[i].in = new_val;
func(b->in[i].s, new_val);
}
for (nr = 0; nr < b->out_count; nr++) {
if (b->out[nr].s != b->in[i].s) continue;
new_val |= b->out[nr].out;
}
func = b->in[i].f->set;
if (func
&& b->in[i].in != new_val) {
b->in[i].in = new_val;
func(b->in[i].s, new_val);
}
}
}
void
sig_boolean_set(struct sig_boolean *b, void *s, unsigned int val)
{
unsigned int nr;
again: ;
for (nr = 0; ; nr++) {
if (nr == b->out_count) {
fprintf(stderr, "WARNING: late registration of boolean driver of %p!\n", s);
sig_boolean_connect_out(b, s, 0);
goto again;
}
assert(nr < b->out_count);
if (b->out[nr].s == s) {
b->out[nr].out = val;
break;
}
}
sig_boolean_flush(b);
}
void
sig_boolean_connect_in(
struct sig_boolean *b,
void *s,
const struct sig_boolean_funcs *f
)
{
assert(b);
assert(b->type == SIG_GEN_BOOLEAN);
assert(b->in_count < sizeof(b->in) / sizeof(b->in[0]));
assert(s);
assert(f);
assert(f->set || f->set_ext);
assert(! f->set || ! f->set_ext);
b->in[b->in_count].s = s;
b->in[b->in_count].f = f;
b->in[b->in_count].in = 0;
b->in_count++;
sig_boolean_flush(b);
}
void
sig_boolean_connect_out(
struct sig_boolean *b,
void *s,
unsigned int val
)
{
assert(b);
assert(b->type == SIG_GEN_BOOLEAN);
assert(b->out_count < sizeof(b->out) / sizeof(b->out[0]));
// assert(s);
assert(val == 0 || val == 1);
if (! s) {
fprintf(stderr, "WARNING: %s: s is NULL pointer!\n",
__FUNCTION__);
}
b->out[b->out_count].s = s;
b->out[b->out_count].out = val;
b->out_count++;
sig_boolean_flush(b);
}
static void
sig_boolean_s0_set(void *_f, unsigned int val)
{
struct sig_boolean_merge *f = (struct sig_boolean_merge *) _f;
sig_boolean_set(f->s1, f, val);
}
static void
sig_boolean_s1_set(void *_f, unsigned int val)
{
struct sig_boolean_merge *f = (struct sig_boolean_merge *) _f;
sig_boolean_set(f->s0, f, val);
}
struct sig_boolean_merge *
sig_boolean_merge(struct sig_boolean *s0, struct sig_boolean *s1)
{
static struct sig_boolean_funcs s0_funcs = {
.set_ext = sig_boolean_s0_set,
};
static struct sig_boolean_funcs s1_funcs = {
.set_ext = sig_boolean_s1_set,
};
struct sig_boolean_merge *m;
m = malloc(sizeof(*m));
assert(m);
/* Out */
m->s0 = s0;
sig_boolean_connect_out(s0, m, 0);
m->s1 = s1;
sig_boolean_connect_out(s1, m, 0);
/* In */
sig_boolean_connect_in(s0, m, &s0_funcs);
sig_boolean_connect_in(s1, m, &s1_funcs);
return m;
}
void
sig_boolean_split(struct sig_boolean_merge *m)
{
fixme();
}
struct sig_boolean *
sig_boolean_create(const char *name)
{
struct sig_boolean *b;
b = malloc(sizeof(*b));
assert(b);
memset(b, 0, sizeof(*b));
b->type = SIG_GEN_BOOLEAN;
b->in_count = 0;
b->out_count = 0;
return b;
}
void
sig_boolean_destroy(struct sig_boolean *b)
{
free(b);
}
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