Contract Source Code:
File 1 of 1 : sacToken
pragma solidity ^0.4.20;
//---------------------------------------------------------
// 增强版的代币合约 V 0.9
// WangYi 2018-05-07
//---------------------------------------------------------
contract ERC20ext
{
// stand
function totalSupply() public constant returns (uint supply);
function balanceOf( address who ) public constant returns (uint value);
function allowance( address owner, address spender ) public constant returns (uint _allowance);
function transfer( address to, uint value) public returns (bool ok);
function transferFrom( address from, address to, uint value) public returns (bool ok);
function approve( address spender, uint value ) public returns (bool ok);
event Transfer( address indexed from, address indexed to, uint value);
event Approval( address indexed owner, address indexed spender, uint value);
// extand
function postMessage(address dst, uint wad,string data) public returns (bool ok);
function appointNewCFO(address newCFO) public returns (bool ok);
function melt(address dst, uint256 wad) public returns (bool ok);
function mint(address dst, uint256 wad) public returns (bool ok);
function freeze(address dst, bool flag) public returns (bool ok);
event MeltEvent(address indexed dst, uint256 wad);
event MintEvent(address indexed dst, uint256 wad);
event FreezeEvent(address indexed dst, bool flag);
}
//---------------------------------------------------------
// SafeMath 是一个安全数字运算的合约
//---------------------------------------------------------
contract SafeMath
{
/**
* @dev Multiplies two numbers, throws on overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256 c)
{
if (a == 0) {
return 0;
}
c = a * b;
assert(c / a == b);
return c;
}
/**
* @dev Integer division of two numbers, truncating the quotient.
*/
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 a / b;
}
/**
* @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256)
{
assert(b <= a);
return a - b;
}
/**
* @dev Adds two numbers, throws on overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256 c)
{
c = a + b;
assert(c >= a);
return c;
}
}
//---------------------------------------------------------
// sacToken 是一个增强版ERC20合约
//---------------------------------------------------------
contract sacToken is ERC20ext,SafeMath
{
string public name;
string public symbol;
uint8 public decimals = 18;
address _cfo;
uint256 _supply;
//帐户的余额列表
mapping (address => uint256) _balances;
//帐户的转账限额
mapping (address => mapping (address => uint256)) _allowance;
//帐户的资金冻结
mapping (address => bool) public _frozen;
//-----------------------------------------------
// 初始化合约,并把所有代币都给CFO
//-----------------------------------------------
// @param initialSupply 发行总量
// @param tokenName 代币名称
// @param tokenSymbol 代币符号
//-----------------------------------------------
function sacToken(uint256 initialSupply,string tokenName,string tokenSymbol) public
{
_cfo = msg.sender;
_supply = initialSupply * 10 ** uint256(decimals);
_balances[_cfo] = _supply;
name = tokenName;
symbol = tokenSymbol;
}
//-----------------------------------------------
// 判断合约调用者是否 CFO
//-----------------------------------------------
modifier onlyCFO()
{
require(msg.sender == _cfo);
_;
}
//-----------------------------------------------
// 获取货币供应量
//-----------------------------------------------
function totalSupply() public constant returns (uint256)
{
return _supply;
}
//-----------------------------------------------
// 查询账户余额
//-----------------------------------------------
// @param src 帐户地址
//-----------------------------------------------
function balanceOf(address src) public constant returns (uint256)
{
return _balances[src];
}
//-----------------------------------------------
// 查询账户转账限额
//-----------------------------------------------
// @param src 来源帐户地址
// @param dst 目标帐户地址
//-----------------------------------------------
function allowance(address src, address dst) public constant returns (uint256)
{
return _allowance[src][dst];
}
//-----------------------------------------------
// 账户转账
//-----------------------------------------------
// @param dst 目标帐户地址
// @param wad 转账金额
//-----------------------------------------------
function transfer(address dst, uint wad) public returns (bool)
{
//检查冻结帐户
require(!_frozen[msg.sender]);
require(!_frozen[dst]);
//检查帐户余额
require(_balances[msg.sender] >= wad);
_balances[msg.sender] = sub(_balances[msg.sender],wad);
_balances[dst] = add(_balances[dst], wad);
Transfer(msg.sender, dst, wad);
return true;
}
//-----------------------------------------------
// 账户转账带检查限额
//-----------------------------------------------
// @param src 来源帐户地址
// @param dst 目标帐户地址
// @param wad 转账金额
//-----------------------------------------------
function transferFrom(address src, address dst, uint wad) public returns (bool)
{
//检查冻结帐户
require(!_frozen[msg.sender]);
require(!_frozen[dst]);
//检查帐户余额
require(_balances[src] >= wad);
//检查帐户限额
require(_allowance[src][msg.sender] >= wad);
_allowance[src][msg.sender] = sub(_allowance[src][msg.sender],wad);
_balances[src] = sub(_balances[src],wad);
_balances[dst] = add(_balances[dst],wad);
//转账事件
Transfer(src, dst, wad);
return true;
}
//-----------------------------------------------
// 设置转账限额
//-----------------------------------------------
// @param dst 目标帐户地址
// @param wad 限制金额
//-----------------------------------------------
function approve(address dst, uint256 wad) public returns (bool)
{
_allowance[msg.sender][dst] = wad;
//设置事件
Approval(msg.sender, dst, wad);
return true;
}
//-----------------------------------------------
// 账户转账带附加数据
//-----------------------------------------------
// @param dst 目标帐户地址
// @param wad 限制金额
// @param data 附加数据
//-----------------------------------------------
function postMessage(address dst, uint wad,string data) public returns (bool)
{
return transfer(dst,wad);
}
//-----------------------------------------------
// 任命新的CFO
//-----------------------------------------------
// @param newCFO 新的CFO帐户地址
//-----------------------------------------------
function appointNewCFO(address newCFO) onlyCFO public returns (bool)
{
if (newCFO != _cfo)
{
_cfo = newCFO;
return true;
}
else
{
return false;
}
}
//-----------------------------------------------
// 冻结帐户
//-----------------------------------------------
// @param dst 目标帐户地址
// @param flag 冻结
//-----------------------------------------------
function freeze(address dst, bool flag) onlyCFO public returns (bool)
{
_frozen[dst] = flag;
//冻结帐户事件
FreezeEvent(dst, flag);
return true;
}
//-----------------------------------------------
// 铸造代币
//-----------------------------------------------
// @param dst 目标帐户地址
// @param wad 铸造金额
//-----------------------------------------------
function mint(address dst, uint256 wad) onlyCFO public returns (bool)
{
//目标帐户地址铸造代币,同时更新总量
_balances[dst] = add(_balances[dst],wad);
_supply = add(_supply,wad);
//铸造代币事件
MintEvent(dst, wad);
return true;
}
//-----------------------------------------------
// 销毁代币
//-----------------------------------------------
// @param dst 目标帐户地址
// @param wad 销毁金额
//-----------------------------------------------
function melt(address dst, uint256 wad) onlyCFO public returns (bool)
{
//检查帐户余额
require(_balances[dst] >= wad);
//销毁目标帐户地址代币,同时更新总量
_balances[dst] = sub(_balances[dst],wad);
_supply = sub(_supply,wad);
//销毁代币事件
MeltEvent(dst, wad);
return true;
}
}