pragma solidity ^0.5.2;
/*
* STONK.sol
* STONK v4 0.3125% FoT token smart contract
* 2020-06-20
**/
interface IERC20 {
function totalSupply() external view returns(uint256);
function balanceOf(address who) external view returns(uint256);
function allowance(address owner, address spender) external view returns(uint256);
function transfer(address to, uint256 value) external returns(bool);
function approve(address spender, uint256 value) external returns(bool);
function transferFrom(address from, address to, uint256 value) external returns(bool);
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
}
library SafeMath {
function mul(uint256 a, uint256 b) internal pure returns(uint256) {
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b);
return c;
}
function div(uint256 a, uint256 b) internal pure returns(uint256) {
require(b > 0);
uint256 c = a / b;
return c;
}
function sub(uint256 a, uint256 b) internal pure returns(uint256) {
require(b <= a);
uint256 c = a - b;
return c;
}
function add(uint256 a, uint256 b) internal pure returns(uint256) {
uint256 c = a + b;
require(c >= a);
return c;
}
function ceil(uint256 a, uint256 m) internal pure returns(uint256) {
uint256 c = add(a, m);
uint256 d = sub(c, 1);
return mul(div(d, m), m);
}
}
contract ERC20Detailed is IERC20 {
string private _name;
string private _symbol;
uint8 private _decimals;
constructor(string memory name, string memory symbol, uint8 decimals) public {
_name = name;
_symbol = symbol;
_decimals = decimals;
}
function name() public view returns(string memory) {
return _name;
}
function symbol() public view returns(string memory) {
return _symbol;
}
function decimals() public view returns(uint8) {
return _decimals;
}
}
contract STONK is ERC20Detailed {
using SafeMath for uint256;
mapping(address => uint256) private _balances;
mapping(address => mapping(address => uint256)) private _allowances;
uint256 private _totalSupply = 101000000000000000000000000;
/// @note The base percent for the burn amount.
uint256 public basePercent = 320;
constructor() public ERC20Detailed("STONK", "STONK", 18) {
_mint(msg.sender, _totalSupply);
}
/// @return Total number of tokens in circulation
function totalSupply() public view returns(uint256) {
return _totalSupply;
}
/**
* @notice Get the number of tokens held by the `owner`
* @param owner The address of the account to get the balance of
* @return The number of tokens held
*/
function balanceOf(address owner) public view returns(uint256) {
return _balances[owner];
}
/**
* @notice Get the number of tokens `spender` is approved to spend on behalf of `owner`
* @param owner The address of the account holding the funds
* @param spender The address of the account spending the funds
* @return The number of tokens approved
*/
function allowance(address owner, address spender) public view returns(uint256) {
return _allowances[owner][spender];
}
/**
* @notice Find the number of tokens to burn from `value`. Approximated at 0.3125%.
* @param value The value to find the burn amount from
* @return The found burn amount
*/
function findBurnAmount(uint256 value) public view returns(uint256) {
//Allow transfers of 0.000000000000000001
if (value == 1) {
return 0;
}
uint256 roundValue = value.ceil(basePercent);
//Gas optimized
uint256 burnAmount = roundValue.mul(100).div(32000);
return burnAmount;
}
/**
* @notice Transfer `value` minus `findBurnAmount(value)` tokens from `msg.sender` to `to`,
* while subtracting `findBurnAmount(value)` tokens from `_totalSupply`. This performs a transfer with an approximated fee of 0.3125%
* @param to The address of the destination account
* @param value The number of tokens to transfer
* @return Whether or not the transfer succeeded
*/
function transfer(address to, uint256 value) public returns(bool) {
require(to != address(0));
uint256 tokensToBurn = findBurnAmount(value);
uint256 tokensToTransfer = value.sub(tokensToBurn);
_balances[msg.sender] = _balances[msg.sender].sub(value);
_balances[to] = _balances[to].add(tokensToTransfer);
_totalSupply = _totalSupply.sub(tokensToBurn);
emit Transfer(msg.sender, to, tokensToTransfer);
emit Transfer(msg.sender, address(0), tokensToBurn);
return true;
}
/**
* @notice Approve `spender` to transfer up to `value` from `from`
* @dev This will overwrite the approval amount for `spender`
* and is subject to issues noted [here](https://eips.ethereum.org/EIPS/eip-20#approve)
* @param spender The address of the account which may transfer tokens
* @param value The number of tokens that are approved
* @return Whether or not the approval succeeded
*/
function approve(address spender, uint256 value) public returns(bool) {
require(spender != address(0));
_allowances[msg.sender][spender] = value;
emit Approval(msg.sender, spender, value);
return true;
}
/**
* @notice Transfer `value` minus `findBurnAmount(value)` tokens from `from` to `to`,
* while subtracting `findBurnAmount(value)` tokens from `_totalSupply`. This performs a transfer with an approximated fee of 0.3125%
* @param from The address of the source account
* @param to The address of the destination account
* @param value The number of tokens to transfer
* @return Whether or not the transfer succeeded
*/
function transferFrom(address from, address to, uint256 value) public returns(bool) {
require(value <= _allowances[from][msg.sender]);
require(to != address(0));
_balances[from] = _balances[from].sub(value);
uint256 tokensToBurn = findBurnAmount(value);
uint256 tokensToTransfer = value.sub(tokensToBurn);
_balances[to] = _balances[to].add(tokensToTransfer);
_totalSupply = _totalSupply.sub(tokensToBurn);
_allowances[from][msg.sender] = _allowances[from][msg.sender].sub(value);
emit Transfer(from, to, tokensToTransfer);
emit Transfer(from, address(0), tokensToBurn);
return true;
}
/**
* @notice Increase allowance of `spender` by 'addedValue'
* @param spender The address of the account which may transfer tokens
* @param addedValue Value to be added onto the existing allowance amount
* @return Whether or not the allowance increase succeeded
*/
function increaseAllowance(address spender, uint256 addedValue) public returns(bool) {
require(spender != address(0));
_allowances[msg.sender][spender] = (_allowances[msg.sender][spender].add(addedValue));
emit Approval(msg.sender, spender, _allowances[msg.sender][spender]);
return true;
}
/**
* @notice Decrease allowance of `spender` by 'subtractedValue'
* @param spender The address of the account which may transfer tokens
* @param subtractedValue Value to be subtracted onto the existing allowance amount
* @return Whether or not the allowance decrease succeeded
*/
function decreaseAllowance(address spender, uint256 subtractedValue) public returns(bool) {
require(spender != address(0));
_allowances[msg.sender][spender] = (_allowances[msg.sender][spender].sub(subtractedValue));
emit Approval(msg.sender, spender, _allowances[msg.sender][spender]);
return true;
}
function _mint(address account, uint256 amount) internal {
require(amount != 0);
_balances[account] = _balances[account].add(amount);
emit Transfer(address(0), account, amount);
}
/**
* @notice Burn `amount` of tokens from `msg.sender` by sending them to `address(0)`
* @param amount The amount of tokens to burn
*/
function burn(uint256 amount) external {
_burn(msg.sender, amount);
}
function _burn(address account, uint256 amount) internal {
require(amount != 0);
_totalSupply = _totalSupply.sub(amount);
_balances[account] = _balances[account].sub(amount);
emit Transfer(account, address(0), amount);
}
/**
* @notice Burn `amount` of tokens from `account` by sending them to `address(0)`
* @param amount The amount of tokens to burn
*/
function burnFrom(address account, uint256 amount) external {
require(amount <= _allowances[account][msg.sender]);
_allowances[account][msg.sender] = _allowances[account][msg.sender].sub(amount);
_burn(account, amount);
}
}
{
"compilationTarget": {
"STONK.sol": "STONK"
},
"evmVersion": "istanbul",
"libraries": {},
"optimizer": {
"enabled": false,
"runs": 200
},
"remappings": []
}
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