73 lines
2.1 KiB
Solidity
73 lines
2.1 KiB
Solidity
/*
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Copyright 2020 DODO ZOO.
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SPDX-License-Identifier: Apache-2.0
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*/
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pragma solidity 0.6.9;
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import {SafeMath} from "../lib/SafeMath.sol";
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contract TestERC20 {
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using SafeMath for uint256;
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string public name;
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uint8 public decimals;
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mapping(address => uint256) balances;
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mapping(address => mapping(address => uint256)) internal allowed;
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event Transfer(address indexed from, address indexed to, uint256 amount);
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event Approval(address indexed owner, address indexed spender, uint256 amount);
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constructor(string memory _name, uint8 _decimals) public {
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name = _name;
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decimals = _decimals;
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}
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function transfer(address to, uint256 amount) public returns (bool) {
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require(to != address(0), "TO_ADDRESS_IS_EMPTY");
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require(amount <= balances[msg.sender], "BALANCE_NOT_ENOUGH");
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balances[msg.sender] = balances[msg.sender].sub(amount);
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balances[to] = balances[to].add(amount);
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emit Transfer(msg.sender, to, amount);
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return true;
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}
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function balanceOf(address owner) public view returns (uint256 balance) {
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return balances[owner];
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}
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function transferFrom(
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address from,
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address to,
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uint256 amount
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) public returns (bool) {
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require(to != address(0), "TO_ADDRESS_IS_EMPTY");
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require(amount <= balances[from], "BALANCE_NOT_ENOUGH");
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require(amount <= allowed[from][msg.sender], "ALLOWANCE_NOT_ENOUGH");
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balances[from] = balances[from].sub(amount);
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balances[to] = balances[to].add(amount);
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allowed[from][msg.sender] = allowed[from][msg.sender].sub(amount);
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emit Transfer(from, to, amount);
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return true;
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}
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function approve(address spender, uint256 amount) public returns (bool) {
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allowed[msg.sender][spender] = amount;
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emit Approval(msg.sender, spender, amount);
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return true;
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}
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function allowance(address owner, address spender) public view returns (uint256) {
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return allowed[owner][spender];
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}
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function mint(address account, uint256 amount) external {
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balances[account] = balances[account].add(amount);
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}
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}
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