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57 lines
1.6 KiB
57 lines
1.6 KiB
// SPDX-License-Identifier: agpl-3.0
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pragma solidity ^0.8.0;
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// with mint
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contract DummyERC20Impl {
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uint256 t;
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mapping (address => uint256) b;
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mapping (address => mapping (address => uint256)) a;
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string public name;
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string public symbol;
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uint public decimals;
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function myAddress() public returns (address) {
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return address(this);
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}
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function add(uint a, uint b) internal pure returns (uint256) {
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uint c = a +b;
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require (c >= a);
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return c;
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}
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function sub(uint a, uint b) internal pure returns (uint256) {
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require (a>=b);
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return a-b;
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}
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function totalSupply() external view returns (uint256) {
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return t;
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}
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function balanceOf(address account) external view returns (uint256) {
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return b[account];
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}
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function transfer(address recipient, uint256 amount) external returns (bool) {
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b[msg.sender] = sub(b[msg.sender], amount);
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b[recipient] = add(b[recipient], amount);
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return true;
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}
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function allowance(address owner, address spender) external view returns (uint256) {
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return a[owner][spender];
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}
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function approve(address spender, uint256 amount) external returns (bool) {
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a[msg.sender][spender] = amount;
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return true;
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}
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function transferFrom(
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address sender,
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address recipient,
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uint256 amount
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) external returns (bool) {
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b[sender] = sub(b[sender], amount);
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b[recipient] = add(b[recipient], amount);
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a[sender][msg.sender] = sub(a[sender][msg.sender], amount);
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return true;
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}
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} |