Contract Source Code:
File 1 of 1 : Eurno
pragma solidity 0.4.24;
/**
* @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) {
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 Ownable
* @dev The Ownable contract has an owner address, and provides basic authorization control
* functions, this simplifies the implementation of "user permissions".
*/
contract Ownable {
address public owner;
event OwnershipRenounced(address indexed previousOwner);
event OwnershipTransferred(
address indexed previousOwner,
address indexed newOwner
);
/**
* @dev The Ownable constructor sets the original `owner` of the contract to the sender
* account.
*/
constructor() public {
owner = msg.sender;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(msg.sender == owner);
_;
}
/**
* @dev Allows the current owner to transfer control of the contract to a newOwner.
* @param newOwner The address to transfer ownership to.
*/
function transferOwnership(address newOwner) public onlyOwner {
require(newOwner != address(0));
emit OwnershipTransferred(owner, newOwner);
owner = newOwner;
}
/**
* @dev Allows the current owner to relinquish control of the contract.
*/
function renounceOwnership() public onlyOwner {
emit OwnershipRenounced(owner);
owner = address(0);
}
}
/**
* @title ForeignToken
* @dev Enables smart contract to hold and send other ERC20 tokens.
*/
contract ForeignToken {
function balanceOf(address _owner) public view returns (uint256);
function transfer(address _to, uint256 _value) public returns (bool);
}
contract Eurno is ERC20Basic, Ownable, ForeignToken {
using SafeMath for uint256;
string public constant name = "Eurno";
string public constant symbol = "ENO";
uint public constant decimals = 8;
uint256 public totalSupply = 28e14;
uint256 internal functAttempts;
event Transfer(address indexed _from, address indexed _to, uint256 _value); // Define the transfer event
event Burn(address indexed burner, uint256 value);
mapping(address => uint256) balances;
mapping(address => mapping (address => uint256)) internal allowed;
/**
* @dev modifier to limit the number of times a function can be called to once.
*/
modifier onlyOnce(){
require(functAttempts <= 0);
_;
}
/**
* @dev Constructor function to start the Eurno token chain.
* Transfer's the owner's wallet with the development fund of 5 million tokens.
*/
constructor() public {
balances[msg.sender] = balances[msg.sender].add(totalSupply); // Update balances on the Ledger.
emit Transfer(this, owner, totalSupply); // Transfer owner 5 mil dev fund.
}
/**
* @dev total number of tokens in existence
*/
function totalSupply() public view returns (uint256) {
return totalSupply;
}
/**
* @dev transfer token for a specified address.
*
* Using onlyPayloadSize to prevent short address attack
* @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 Allows the owner of the contract to distribute to other contracts.
* Used, for example, to distribute the airdrop balance to the airdrop contract.
*
* @param _to is the address of the contract.
* @param _value is the amount of ENO to send to it.
*/
function distAirdrop(address _to, uint256 _value) onlyOwner onlyOnce public returns (bool) {
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);
functAttempts = 1;
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];
}
/**
* @dev Function to withdraw foreign tokens stored in this contract.
*
* @param _tokenContract is the smart contract address of the token to be withdrawn.
*/
function withdrawForeignTokens(address _tokenContract) onlyOwner public returns (bool) {
ForeignToken token = ForeignToken(_tokenContract);
uint256 amount = token.balanceOf(address(this));
return token.transfer(owner, amount);
}
/**
* @dev Fallback function to allow the contract to accept Eth donations.
*/
function() public payable {
}
/**
* @dev Function to allow contract owner to withdraw Ethereum deposited to the Eurno contract.
*/
function withdraw() onlyOwner public {
uint256 etherBalance = address(this).balance;
owner.transfer(etherBalance);
}
/**
* @dev Burns a specific amount of tokens. Can only be called by contract owner.
*
* @param _value The amount of token to be burned.
*/
function burn(uint256 _value) onlyOwner public {
_burn(msg.sender, _value);
}
/**
* @dev actual function to burn tokens.
*
* @param _who is the address of the person burning tokens.
* @param _value is the number of tokens burned.
*/
function _burn(address _who, uint256 _value) internal {
require(_value <= balances[_who]);
// no need to require value <= totalSupply, since that would imply the
// sender's balance is greater than the totalSupply, which *should* be an assertion failure
balances[_who] = balances[_who].sub(_value);
totalSupply = totalSupply.sub(_value);
emit Burn(_who, _value);
emit Transfer(_who, address(0), _value);
}
}