pragma solidity ^0.4.24;
library SafeMath {
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a * b;
assert(a == 0 || c / a == b);
return c;
}
function div(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a / b;
return c;
}
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
assert(b <= a);
return a - b;
}
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
assert(c >= a);
return c;
}
}
contract WineCoin {
using SafeMath for uint256;
address public owner = msg.sender;
mapping (address => uint256) balances;
mapping (address => mapping (address => uint256)) allowed;
string public constant name = "WINE";
string public constant symbol = "WINE";
uint public constant decimals = 8;
uint256 public totalSupply = 990000000e8;
event Approval(address indexed _owner, address indexed _spender, uint256 _value);
event Transfer(address indexed _from, address indexed _to, uint256 _value);
event Burn(address indexed burner, uint256 value);
modifier onlyOwner() {
require(msg.sender == owner,"only owner allow");
_;
}
// mitigates the ERC20 short address attack
modifier onlyPayloadSize(uint size) {
assert(msg.data.length >= size + 4);
_;
}
constructor() public {
owner = msg.sender;
balances[msg.sender] = totalSupply;
}
function transferOwnership(address newOwner) public onlyOwner {
if (newOwner != address(0)) {
owner = newOwner;
}
}
function balanceOf(address _owner) public view returns (uint256) {
return balances[_owner];
}
function transfer(address _to, uint256 _amount) public onlyPayloadSize(2 * 32) returns (bool success) {
require(_to != address(0),"to address error");
require(_amount <= balances[msg.sender],"from token not enough");
balances[msg.sender] = balances[msg.sender].sub(_amount);
balances[_to] = balances[_to].add(_amount);
emit Transfer(msg.sender, _to, _amount);
return true;
}
function transferFrom(address _from, address _to, uint256 _amount) public onlyPayloadSize(3 * 32) returns (bool success) {
require(_to != address(0),"to address error");
require(_amount <= balances[_from],"from token not enough");
require(_amount <= allowed[_from][msg.sender],"insufficient credit");
balances[_from] = balances[_from].sub(_amount);
allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_amount);
balances[_to] = balances[_to].add(_amount);
emit Transfer(_from, _to, _amount);
return true;
}
function approve(address _spender, uint256 _value) public returns (bool success) {
allowed[msg.sender][_spender] = _value;
emit Approval(msg.sender, _spender, _value);
return true;
}
function allowance(address _owner, address _spender) public view returns (uint256) {
return allowed[_owner][_spender];
}
}
{
"compilationTarget": {
"WineCoin.sol": "WineCoin"
},
"evmVersion": "byzantium",
"libraries": {},
"optimizer": {
"enabled": true,
"runs": 200
},
"remappings": []
}
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