#include <stdlib.h>

#include "logic.h"
#include "error.h"

enum BINARY
logic_not(enum BINARY input) {
	switch (input) {
		case LOGIC_HIGH:
			return LOGIC_LOW;
		case LOGIC_LOW:
			return LOGIC_HIGH;
		default:
			emit_error("Severe: Invalid logic value found\n");
			/* FIXME Don't abort */
			abort();
	}
}

enum BINARY
logic_and(enum BINARY a, enum BINARY b) {
	if (a == LOGIC_HIGH && b == LOGIC_HIGH)
		return LOGIC_HIGH;
	else
		return LOGIC_LOW;
}

enum BINARY
logic_or(enum BINARY a, enum BINARY b) {
	if (a == LOGIC_HIGH || b == LOGIC_HIGH)
		return LOGIC_HIGH;
	else
		return LOGIC_LOW;
}

enum BINARY
logic_xor(enum BINARY a, enum BINARY b) {
	if (   (a == LOGIC_HIGH && b == LOGIC_LOW)
	    || (a == LOGIC_LOW  && b == LOGIC_HIGH))
		return LOGIC_HIGH;
	else
		return LOGIC_LOW;
}

enum BINARY
logic_nand(enum BINARY a, enum BINARY b) {
	return logic_not(logic_and(a, b));
}

enum BINARY
logic_nor(enum BINARY a, enum BINARY b) {
	return logic_not(logic_or(a, b));
}