Clone the project to project_folder/ and install dependencies
cd project_folder/
npm install && mkdir contracts/Place the following contract to contracts/sample.sol
// contracts/sample.sol
pragma solidity^0.4.26;
contract Fund {
mapping(address => uint) balances;
uint counter = 0;
uint dontFixMe = 0;
function main(uint x) public {
if (counter < 100) {
msg.sender.send(x + 1);
counter += 1;
dontFixMe ++;
}
}
}Run npm run dev to patch sample.sol. The fixed file is contracts/fixed.sol
//contracts/fixed.sol
contract sGuard{
function add_uint256(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
assert(c >= a);
return c;
}
bool internal locked_;
constructor() internal {
locked_ = false;
}
modifier nonReentrant_() {
require(!locked_);
locked_ = true;
_;
locked_ = false;
}
}
pragma solidity^0.4.26;
contract Fund is sGuard {
mapping(address => uint) balances;
uint counter = 0;
uint dontFixMe = 0;
function main(uint x) nonReentrant_ public {
if (counter < 100) {
msg.sender.send(add_uint256(x, 1));
counter = add_uint256(counter, 1);
dontFixMe ++;
}
}
}