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// This contract is part of Zellic’s smart contract dataset, which is a collection of publicly available contract code gathered as of March 2023.
/**
*Submitted for verification at Etherscan.io on 2022-09-11
*/
// SPDX-License-Identifier: None
pragma solidity 0.8.17;
interface IERC20 {
function totalSupply() external view returns (uint256);
function balanceOf(address account) external view returns (uint256);
function transfer(address to, uint256 amount) external returns (bool);
function allowance(address owner, address spender) external view returns (uint256);
function approve(address spender, uint256 amount) external returns (bool);
function transferFrom(
address from,
address to,
uint256 amount
) external returns (bool);
function name() external view returns (string memory);
function symbol() external view returns (string memory);
function decimals() external view returns (uint8);
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
}
contract PoSteak is IERC20 {
string private _name;
string private _symbol;
uint8 public _decimals;
mapping(address => uint256) private _balances;
mapping(address => mapping(address => uint256)) private _allowances;
uint256 private _totalSupply;
function _msgSender() internal view virtual returns (address)
{
return msg.sender;
}
constructor(string memory NAME, string memory SYMBOL, uint8 DECIMALS, uint TOTAL_SUPPLY)
{
_name = NAME;
_symbol = SYMBOL;
_decimals = DECIMALS;
_mint(msg.sender, TOTAL_SUPPLY);
}
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;
}
function totalSupply() public view returns (uint256)
{
return _totalSupply;
}
function balanceOf(address account) public view returns (uint256)
{
return _balances[account];
}
function transfer(address to, uint256 amount) public returns (bool)
{
address owner = _msgSender();
_transfer(owner, to, amount);
return true;
}
function allowance(address owner, address spender) public view returns (uint256)
{
return _allowances[owner][spender];
}
function approve(address spender, uint256 amount) public virtual override returns (bool)
{
address owner = _msgSender();
_approve(owner, spender, amount);
return true;
}
function transferFrom(address from, address to, uint256 amount) public returns (bool)
{
address spender = _msgSender();
_spendAllowance(from, spender, amount);
_transfer(from, to, amount);
return true;
}
function increaseAllowance(address spender, uint256 addedValue) public returns (bool)
{
address owner = _msgSender();
_approve(owner, spender, _allowances[owner][spender] + addedValue);
return true;
}
function decreaseAllowance(address spender, uint256 subtractedValue) public returns(bool)
{
address owner = _msgSender();
uint256 currentAllowance = _allowances[owner][spender];
require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
unchecked {
_approve(owner, spender, currentAllowance - subtractedValue);
}
return true;
}
function _transfer(address from, address to, uint256 amount) internal
{
require(from != address(0), "ERC20: transfer from the zero address");
require(to != address(0), "ERC20: transfer to the zero address");
uint256 fromBalance = _balances[from];
require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
unchecked {
_balances[from] = fromBalance - amount;
}
_balances[to] += amount;
emit Transfer(from, to, amount);
}
function _mint(address account, uint256 amount) internal
{
require(account != address(0), "ERC20: mint to the zero address");
_totalSupply += amount;
_balances[account] += amount;
emit Transfer(address(0), account, amount);
}
function _approve(address owner, address spender, uint256 amount) internal
{
require(owner != address(0), "ERC20: approve from the zero address");
require(spender != address(0), "ERC20: approve to the zero address");
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
function _spendAllowance(address owner, address spender, uint256 amount) internal
{
uint256 currentAllowance = allowance(owner, spender);
if (currentAllowance != type(uint256).max) {
require(currentAllowance >= amount, "ERC20: insufficient allowance");
unchecked {
_approve(owner, spender, currentAllowance - amount);
}
}
}
} |