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#include <string.h>
#include <stdlib.h>
#include "gate.h"
#include "error.h"
#define GATE_MAX 1024
#define INPUT_MAX 1024
#define OUTPUT_MAX 1024
static size_t gate_count;
static size_t input_count;
static struct gate gates[GATE_MAX];
static struct gate inputs[INPUT_MAX];
int
count_guard(int c, int max, char *desc) {
if (c >= max) {
emit_error("Internal: too many %s\n", desc);
return 1;
}
return 0;
}
int
gate_add_generic(struct gate *array, size_t array_index, char *name, enum BINARY (*operation)(enum BINARY, enum BINARY), struct gate *in1, struct gate *in2) {
struct gate g;
if (name == NULL) {
g.name = NULL;
} else {
g.name = strdup(name);
if (g.name == NULL) {
emit_error("strdup failed");
return 1;
}
}
g.operation = operation;
g.in1 = in1;
g.in2 = in2;
array[array_index] = g;
return 0;
}
struct gate*
gate_get_input_by_name(char *name) {
struct gate *res = NULL;
size_t i = 0;
for (i = 0; i < input_count; i++) {
if (inputs[i].name == NULL) {
emit_error("input at index %zd has NULL name, ignoring", i);
continue;
}
if (strcmp(inputs[i].name, name) == 0) {
res = &inputs[i];
break;
}
}
return res;
}
int
gate_input_add(char *name) {
int res = 0;
if (count_guard(input_count, INPUT_MAX, "inputs")) {
return 1;
}
if (gate_get_input_by_name(name) != NULL) {
emit_error("Already an input called \"%s\"!\n", name);
return 1;
}
res = gate_add_generic(inputs, input_count, name, logic_and, NULL, NULL);
input_count++;
return res;
}
int
gate_add(char *name, enum BINARY (*operation)(enum BINARY, enum BINARY), struct gate *in1, struct gate *in2) {
if (count_guard(gate_count, GATE_MAX, "gates")) {
return 1;
}
gate_add_generic(gates, gate_count, name, operation, in1, in2);
gate_count++;
return 0;
}
void
gate_free_all() {
size_t i = 0;
for (i = 0; i < gate_count; i++) {
if (gates[i].name != NULL) {
free(gates[i].name);
}
}
}
int
tick(void) {
/* FIXME */
return 1;
}
void
gate_init(void) {
gate_count = 0;
input_count = 0;
memset(gates, 0, sizeof(gates));
memset(inputs, 0, sizeof(inputs));
}
void
gate_dump(void) {
size_t i = 0;
emit_info("Gates:\n");
for (i = 0; i < gate_count; i++) {
emit_info("gate '%s': %s\n", gates[i].name, gates[i].output == LOGIC_HIGH ? "HIGH" : "LOW");
}
}
int
gate_set_input(char *name, enum BINARY value) {
struct gate *g = NULL;
if (NULL == (g = gate_get_input_by_name(name))) {
emit_error("No such input %s", name);
return 1;
}
g->output = value;
return 0;
}
void gate_update(void) {
size_t i = 0;
struct gate *g = NULL;
enum BINARY in1 = LOGIC_LOW;
enum BINARY in2 = LOGIC_LOW;
/* FIXME should be input->output flow path */
/* FIXME data flow doesn't matter yet because gate chaining isn't allowed */
for (i = 0; i < gate_count; i++) {
g = &gates[i];
in1 = g->in1->output;
in2 = g->in2->output;
g->output = (g->operation)(in1, in2);
}
}
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