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pragma solidity ^ 0.4.21;
contract owned {
address public owner;
function owned() {
owner = msg.sender;
}
modifier onlyOwner {
require(msg.sender == owner);
_;
}
function transferOwnership(address newOwner) onlyOwner {
if (newOwner != address(0)) {
owner = newOwner;
}
}
}
/**
* @title SafeMath
* @dev Math operations with safety checks that throw on error
*/
library SafeMath {
function mul(uint256 a, uint256 b) internal pure returns(uint256) {
uint256 c = a * b;
assert(a == 0 || c / a == b);
return c;
}
function div(uint256 a, uint256 b) internal pure returns(uint256) {
// assert(b > 0); // Solidity automatically throws when dividing by 0
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
function sub(uint256 a, uint256 b) internal pure returns(uint256) {
assert(b <= a);
return a - b;
}
function add(uint256 a, uint256 b) internal pure returns(uint256) {
uint256 c = a + b;
assert(c >= a);
return c;
}
}
contract HomeLoansToken is owned {
using SafeMath
for uint256;
string public name;
string public symbol;
uint public decimals;
uint256 public totalSupply;
/// @dev Fix for the ERC20 short address attack http://vessenes.com/the-erc20-short-address-attack-explained/
/// @param size payload size
modifier onlyPayloadSize(uint size) {
require(msg.data.length >= size + 4);
_;
}
/* This creates an array with all balances */
mapping(address => uint256) public balanceOf;
mapping(address => mapping(address => uint256)) public allowed;
/* This generates a public event on the blockchain that will notify clients */
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint value);
function HomeLoansToken(
uint256 initialSupply,
string tokenName,
uint decimalUnits,
string tokenSymbol
) {
owner = msg.sender;
totalSupply = initialSupply.mul(10 ** decimalUnits);
balanceOf[msg.sender] = totalSupply; // Give the creator half initial tokens
name = tokenName; // Set the name for display purposes
symbol = tokenSymbol; // Set the symbol for display purposes
decimals = decimalUnits; // Amount of decimals for display purposes
}
/// @dev Tranfer tokens to address
/// @param _to dest address
/// @param _value tokens amount
/// @return transfer result
function transfer(address _to, uint256 _value) onlyPayloadSize(2 * 32) returns(bool success) {
require(_to != address(0));
require(_value <= balanceOf[msg.sender]);
// SafeMath.sub will throw if there is not enough balance.
balanceOf[msg.sender] = balanceOf[msg.sender].sub(_value);
balanceOf[_to] = balanceOf[_to].add(_value);
Transfer(msg.sender, _to, _value);
return true;
}
/// @dev Tranfer tokens from one address to other
/// @param _from source address
/// @param _to dest address
/// @param _value tokens amount
/// @return transfer result
function transferFrom(address _from, address _to, uint256 _value) onlyPayloadSize(2 * 32) returns(bool success) {
require(_to != address(0));
require(_value <= balanceOf[_from]);
require(_value <= allowed[_from][msg.sender]);
balanceOf[_from] = balanceOf[_from].sub(_value);
balanceOf[_to] = balanceOf[_to].add(_value);
allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
Transfer(_from, _to, _value);
return true;
}
/// @dev Destroy Tokens
///@param destroyAmount Count Token
function destroyToken(uint256 destroyAmount) onlyOwner {
destroyAmount = destroyAmount.mul(10 ** decimals);
balanceOf[owner] = balanceOf[owner].sub(destroyAmount);
totalSupply = totalSupply.sub(destroyAmount);
}
/// @dev Approve transfer
/// @param _spender holder address
/// @param _value tokens amount
/// @return result
function approve(address _spender, uint _value) returns(bool success) {
require((_value == 0) || (allowed[msg.sender][_spender] == 0));
allowed[msg.sender][_spender] = _value;
Approval(msg.sender, _spender, _value);
return true;
}
/// @dev Token allowance
/// @param _owner holder address
/// @param _spender spender address
/// @return remain amount
function allowance(address _owner, address _spender) constant returns(uint remaining) {
return allowed[_owner][_spender];
}
}