a new software
licensing and distribution
platform

pragma solidity ^0.4.22;

/**
	* @title ERC20Basic
	* @dev Simpler version of ERC20 interface
	* @dev see https://github.com/ethereum/EIPs/issues/179
	*/
contract ERC20Basic {
	function totalSupply() public view returns (uint256);
	function balanceOf(address who) public view returns (uint256);
	function transfer(address to, uint256 value) public returns (bool);
	event Transfer(address indexed from, address indexed to, uint256 value);
}

/**
	* @title SafeMath
	* @dev Math operations with safety checks that throw on error
	*/
library SafeMath {

	/**
	* @dev Multiplies two numbers, throws on overflow.
	*/
	function mul(uint256 a, uint256 b) internal pure returns (uint256 c) {
		// Gas optimization: this is cheaper than asserting 'a' not being zero, but the
		// benefit is lost if 'b' is also tested.
		// See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
		if (a == 0) {
			return 0;
		}

		c = a * b;
		assert(c / a == b);
		return c;
	}

	/**
	* @dev Integer division of two numbers, truncating the quotient.
	*/
	function div(uint256 a, uint256 b) internal pure returns (uint256) {
		// assert(b > 0); // Solidity automatically throws when dividing by 0
		// uint256 c = a / b;
		// assert(a == b * c + a % b); // There is no case in which this doesn't hold
		return a / b;
	}

	/**
	* @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
	*/
	function sub(uint256 a, uint256 b) internal pure returns (uint256) {
		assert(b <= a);
		return a - b;
	}

	/**
	* @dev Adds two numbers, throws on overflow.
	*/
	function add(uint256 a, uint256 b) internal pure returns (uint256 c) {
		c = a + b;
		assert(c >= a);
		return c;
	}
}

/**
	* @title Basic token
	* @dev Basic version of StandardToken, with no allowances.
	*/
contract BasicToken is ERC20Basic {
	using SafeMath for uint256;

	mapping(address => uint256) balances;

	uint256 totalSupply_;

	/**
	* @dev total number of tokens in existence
	*/
	function totalSupply() public view returns (uint256) {
		return totalSupply_;
	}

	/**
	* @dev transfer token for a specified address
	* @param _to The address to transfer to.
	* @param _value The amount to be transferred.
	*/
	function transfer(address _to, uint256 _value) public returns (bool) {
		require(_to != address(0));
		require(_value <= balances[msg.sender]);

		balances[msg.sender] = balances[msg.sender].sub(_value);
		balances[_to] = balances[_to].add(_value);
		emit Transfer(msg.sender, _to, _value);
		return true;
	}

	/**
	* @dev Gets the balance of the specified address.
	* @param _owner The address to query the the balance of.
	* @return An uint256 representing the amount owned by the passed address.
	*/
	function balanceOf(address _owner) public view returns (uint256) {
		return balances[_owner];
	}

}

/**
	* @title ERC20 interface
	* @dev see https://github.com/ethereum/EIPs/issues/20
	*/
contract ERC20 is ERC20Basic {
	function allowance(address owner, address spender)
		public view returns (uint256);

	function transferFrom(address from, address to, uint256 value)
		public returns (bool);

	function approve(address spender, uint256 value) public returns (bool);
	event Approval(
		address indexed owner,
		address indexed spender,
		uint256 value
	);
}

/**
	* @title Standard ERC20 token
	*
	* @dev Implementation of the basic standard token.
	* @dev https://github.com/ethereum/EIPs/issues/20
	* @dev Based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
	*/
contract StandardToken is ERC20, BasicToken {

	mapping (address => mapping (address => uint256)) internal allowed;


	/**
		* @dev Transfer tokens from one address to another
		* @param _from address The address which you want to send tokens from
		* @param _to address The address which you want to transfer to
		* @param _value uint256 the amount of tokens to be transferred
		*/
	function transferFrom(
		address _from,
		address _to,
		uint256 _value
	)
		public
		returns (bool)
	{
		require(_to != address(0));
		require(_value <= balances[_from]);
		require(_value <= allowed[_from][msg.sender]);

		balances[_from] = balances[_from].sub(_value);
		balances[_to] = balances[_to].add(_value);
		allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
		emit Transfer(_from, _to, _value);
		return true;
	}

	/**
		* @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
		*
		* Beware that changing an allowance with this method brings the risk that someone may use both the old
		* and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this
		* race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards:
		* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
		* @param _spender The address which will spend the funds.
		* @param _value The amount of tokens to be spent.
		*/
	function approve(address _spender, uint256 _value) public returns (bool) {
		allowed[msg.sender][_spender] = _value;
		emit Approval(msg.sender, _spender, _value);
		return true;
	}

	/**
		* @dev Function to check the amount of tokens that an owner allowed to a spender.
		* @param _owner address The address which owns the funds.
		* @param _spender address The address which will spend the funds.
		* @return A uint256 specifying the amount of tokens still available for the spender.
		*/
	function allowance(
		address _owner,
		address _spender
		)
		public
		view
		returns (uint256)
	{
		return allowed[_owner][_spender];
	}

	/**
		* @dev Increase the amount of tokens that an owner allowed to a spender.
		*
		* approve should be called when allowed[_spender] == 0. To increment
		* allowed value is better to use this function to avoid 2 calls (and wait until
		* the first transaction is mined)
		* From MonolithDAO Token.sol
		* @param _spender The address which will spend the funds.
		* @param _addedValue The amount of tokens to increase the allowance by.
		*/
	function increaseApproval(
		address _spender,
		uint _addedValue
	)
		public
		returns (bool)
	{
		allowed[msg.sender][_spender] = (
			allowed[msg.sender][_spender].add(_addedValue));
		emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
		return true;
	}

	/**
		* @dev Decrease the amount of tokens that an owner allowed to a spender.
		*
		* approve should be called when allowed[_spender] == 0. To decrement
		* allowed value is better to use this function to avoid 2 calls (and wait until
		* the first transaction is mined)
		* From MonolithDAO Token.sol
		* @param _spender The address which will spend the funds.
		* @param _subtractedValue The amount of tokens to decrease the allowance by.
		*/
	function decreaseApproval(
		address _spender,
		uint _subtractedValue
	)
		public
		returns (bool)
	{
		uint oldValue = allowed[msg.sender][_spender];
		if (_subtractedValue > oldValue) {
			allowed[msg.sender][_spender] = 0;
		} else {
			allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
		}
		emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
		return true;
	}

}

contract C8Token is StandardToken {

	string public constant name = "Cirql8 Token"; // solium-disable-line uppercase
	string public constant symbol = "C8"; // solium-disable-line uppercase
	uint8 public constant decimals = 18; // solium-disable-line uppercase

	uint256 public constant INITIAL_SUPPLY = 2000000000 * (10 ** uint256(decimals));

	/**
		* @dev Constructor that gives msg.sender all of existing tokens.
		*/
	constructor() public {
		totalSupply_ = INITIAL_SUPPLY;
		balances[msg.sender] = INITIAL_SUPPLY;
		emit Transfer(address(0), msg.sender, INITIAL_SUPPLY);
	}

}