以太坊钱包erc20_xvg币智能合约

 1 pragma solidity ^0.5.7;  2  3 import './safemath.sol';  4  5 contract ErbCoin {  6 using SafeMath for uint256;  7  8 string constant public name = "Mask Coin"; // token name  9 string constant public symbol = "MASK"; // token symbol  10 uint256 public decimals = 18; // token digit  11  12 //mapping (address => uint256) public balanceOf;  13 mapping (address => mapping (address => uint256)) public allowance; //a授权给b表示b可转账给其他人的代币数  14 mapping (address => uint256) public frozenBalances; //冻结余额  15 mapping (address => uint256) public balances; //可操作余额  16  17 uint256 public totalSupply = 0;  18 bool public stopped = false;  19  20 //uint256 constant valueFounder = 1000000;  21 address constant zeroaddr = address(0);  22 address owner = zeroaddr; //合约所有者  23 address founder = zeroaddr; //初始代币持有者  24  25  modifier isOwner {  26 assert(owner == msg.sender);  27  _;  28  }  29  30  modifier isFounder {  31 assert(founder == msg.sender);  32  _;  33  }  34  35  modifier isAdmin {  36 assert(owner == msg.sender || founder == msg.sender);  37  _;  38  }  39  40  modifier isRunning {  41 assert (!stopped);  42  _;  43  }  44  45  modifier validAddress {  46 assert(zeroaddr != msg.sender);  47  _;  48  }  49  50 constructor(address _addressFounder,uint256 _valueFounder) public {  51 owner = msg.sender;  52 founder = _addressFounder;  53 totalSupply = _valueFounder*10**decimals;  54 balances[founder] = totalSupply;  55  emit Transfer(zeroaddr, founder, totalSupply);  56  }  57  58 function balanceOf(address _owner) public view returns (uint256) {  59 //账户余额 = 可操作余额 + 被冻结余额  60 return balances[_owner] + frozenBalances[_owner];  61  }  62  63 function transfer(address _to, uint256 _value) public isRunning validAddress returns (bool success) {  64 balances[msg.sender] = balances[msg.sender].sub(_value);  65 balances[_to] = balances[_to].add(_value);  66  emit Transfer(msg.sender, _to, _value);  67 return true;  68  }  69  70 //msg.sender 将 _from 授权给他（msg.sender）的代币转给 _to  71 function transferFrom(address _from, address _to, uint256 _value) public isRunning validAddress returns (bool success) {  72 balances[_from] = balances[_from].sub(_value);  73 //balances[_to] = balances[_to].add(_value);  74 frozenBalances[_to] = frozenBalances[_to].add(_value); //代币为冻结状态  75 allowance[_from][msg.sender] = allowance[_from][msg.sender].sub(_value);  76  emit TransferFrozen(_to, _value);  77 return true;  78  }  79  80 //msg.sender 授权 _spender 可操作代币数  81 function approve(address _spender, uint256 _value) public isRunning isFounder returns (bool success) {  82 require(_value == 0 || allowance[msg.sender][_spender] == 0,"illegal operation");  83 allowance[msg.sender][_spender] = _value;  84  emit Approval(msg.sender, _spender, _value);  85 return true;  86  }  87  88 //冻结部分释放  89 function release(address _target, uint256 _value) public isRunning isAdmin returns(bool){  90 frozenBalances[_target] = frozenBalances[_target].sub(_value);  91 balances[_target] = balances[_target].add(_value);  92  emit Release(_target, _value);  93 return true;  94  }  95  96 function stop() public isAdmin {  97 stopped = true;  98  }  99 100 function start() public isAdmin { 101 stopped = false; 102  } 103 104 event Transfer(address indexed _from, address indexed _to, uint256 _value); 105 event Approval(address indexed _owner, address indexed _spender, uint256 _value); 106 event TransferFrozen(address _target, uint256 _value); 107 event Release(address _target, uint256 _value); 108 }