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50 lines
1.4 KiB
50 lines
1.4 KiB
8 years ago
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pragma solidity ^0.4.4;
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import './ERC20.sol';
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import '../SafeMath.sol';
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/**
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* ERC20 token
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*
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* https://github.com/ethereum/EIPs/issues/20
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* Based on code by FirstBlood:
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* https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
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*/
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contract StandardToken is ERC20, SafeMath {
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mapping(address => uint) balances;
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mapping (address => mapping (address => uint)) allowed;
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function transfer(address _to, uint _value) returns (bool success) {
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balances[msg.sender] = safeSub(balances[msg.sender], _value);
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balances[_to] = safeAdd(balances[_to], _value);
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Transfer(msg.sender, _to, _value);
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return true;
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}
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function transferFrom(address _from, address _to, uint _value) returns (bool success) {
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var _allowance = allowed[_from][msg.sender];
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balances[_to] = safeAdd(balances[_to], _value);
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balances[_from] = safeSub(balances[_from], _value);
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allowed[_from][msg.sender] = safeSub(_allowance, _value);
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Transfer(_from, _to, _value);
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return true;
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}
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function balanceOf(address _owner) constant returns (uint balance) {
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return balances[_owner];
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}
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function approve(address _spender, uint _value) returns (bool success) {
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allowed[msg.sender][_spender] = _value;
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Approval(msg.sender, _spender, _value);
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return true;
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}
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function allowance(address _owner, address _spender) constant returns (uint remaining) {
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return allowed[_owner][_spender];
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}
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}
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