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@vieyang
Created May 4, 2018 02:12
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MySunshine
pragma solidity ^0.4.8;
contract ERC20Interface {
function totalSupply() public constant returns (uint256 supply);
function balance() public constant returns (uint256);
function balanceOf(address _owner) public constant returns (uint256);
function transfer(address _to, uint256 _value) public returns (bool success);
function transferFrom(address _from, address _to, uint256 _value) public returns (bool success);
function approve(address _spender, uint256 _value) public returns (bool success);
function allowance(address _owner, address _spender) public constant returns (uint256 remaining);
event Transfer(address indexed _from, address indexed _to, uint256 _value);
event Approval(address indexed _owner, address indexed _spender, uint256 _value);
}
contract MySunshine is ERC20Interface {
string public constant symbol = "MS";
string public constant name = "MySunshine";
uint8 public constant decimals = 0;
uint256 _totalSupply = 0;
uint256 _airdropAmount = 42;
mapping(address => uint256) balances;
// Owner of account approves the transfer of an amount to another account
mapping(address => mapping (address => uint256)) allowed;
function MySunshine() {
balances[msg.sender] = _airdropAmount * 1000;
_totalSupply = balances[msg.sender];
}
function totalSupply() constant returns (uint256 supply) {
return _totalSupply;
}
// What's my balance?
function balance() constant returns (uint256) {
return getBalance(msg.sender);
}
// What is the balance of a particular account?
function balanceOf(address _address) constant returns (uint256) {
return getBalance(_address);
}
// Transfer the balance from owner's account to another account
function transfer(address _to, uint256 _amount) returns (bool success) {
initialize(msg.sender);
if (balances[msg.sender] >= _amount
&& _amount > 0) {
initialize(_to);
if (balances[_to] + _amount > balances[_to]) {
balances[msg.sender] -= _amount;
balances[_to] += _amount;
Transfer(msg.sender, _to, _amount);
return true;
} else {
return false;
}
} else {
return false;
}
}
// Send _value amount of tokens from address _from to address _to
// The transferFrom method is used for a withdraw workflow, allowing contracts to send
// tokens on your behalf, for example to "deposit" to a contract address and/or to charge
// fees in sub-currencies; the command should fail unless the _from account has
// deliberately authorized the sender of the message via some mechanism; we propose
// these standardized APIs for approval:
function transferFrom(address _from, address _to, uint256 _amount) returns (bool success) {
initialize(_from);
if (balances[_from] >= _amount
&& allowed[_from][msg.sender] >= _amount
&& _amount > 0) {
initialize(_to);
if (balances[_to] + _amount > balances[_to]) {
balances[_from] -= _amount;
allowed[_from][msg.sender] -= _amount;
balances[_to] += _amount;
Transfer(_from, _to, _amount);
return true;
} else {
return false;
}
} else {
return false;
}
}
// Allow _spender to withdraw from your account, multiple times, up to the _value amount.
// If this function is called again it overwrites the current allowance with _value.
function approve(address _spender, uint256 _amount) returns (bool success) {
allowed[msg.sender][_spender] = _amount;
Approval(msg.sender, _spender, _amount);
return true;
}
function allowance(address _owner, address _spender) constant returns (uint256 remaining) {
return allowed[_owner][_spender];
}
// internal private functions
function initialize(address _address) internal returns (bool success) {
balances[_address] += _airdropAmount;
_totalSupply += _airdropAmount;
}
function getBalance(address _address) internal returns (uint256) {
return balances[_address] + _airdropAmount;
}
}
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