solidity/std/StandardToken.sol

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import "./Token.sol";
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contract StandardToken is Token {
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uint256 public totalSupply;
mapping (address => uint256) public balanceOf;
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mapping (address =>
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mapping (address => uint256)) public allowance;
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function StandardToken(address _initialOwner, uint256 _supply) {
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totalSupply = _supply;
balanceOf[_initialOwner] = _supply;
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}
function transfer(address _to, uint256 _value) returns (bool success) {
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if (balanceOf[msg.sender] >= _value && balanceOf[_to] + _value >= balanceOf[_to]) {
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balanceOf[msg.sender] -= _value;
balanceOf[_to] += _value;
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Transfer(msg.sender, _to, _value);
return true;
}
else {
return false;
}
}
function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {
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if (allowance[_from][msg.sender] >= _value && balanceOf[_to] + _value >= balanceOf[_to]) {
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allowance[_from][msg.sender] -= _value;
balanceOf[_to] += _value;
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Transfer(_from, _to, _value);
return true;
}
else {
return false;
}
}
function approve(address _spender, uint256 _value) returns (bool success) {
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allowance[msg.sender][_spender] = _value;
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Approval(msg.sender, _spender, _value);
return true;
}
}