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pragma solidity ^0.4.19;
/*
Copyright 2018, Vicent Nos, Enrique Santos & Mireia Puig
License:
https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode
*/
library SafeMath {
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
if (a == 0) {
return 0;
}
uint256 c = a * b;
assert(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 Ownable {
address public owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
function Ownable() internal {
owner = msg.sender;
}
modifier onlyOwner() {
require(msg.sender == owner);
_;
}
function transferOwnership(address newOwner) public onlyOwner {
require(newOwner != address(0));
OwnershipTransferred(owner, newOwner);
owner = newOwner;
}
}
//////////////////////////////////////////////////////////////
// //
// Lescovex, Open End Crypto Fund ERC20 //
// //
//////////////////////////////////////////////////////////////
contract LescovexERC20 is Ownable {
using SafeMath for uint256;
mapping (address => uint256) public balances;
mapping (address => mapping (address => uint256)) internal allowed;
/* Public variables for the ERC20 token */
string public constant standard = "ERC20 Lescovex ABT";
uint8 public constant decimals = 8; // hardcoded to be a constant
uint256 public totalSupply;
string public name;
string public symbol;
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
function balanceOf(address _owner) public view returns (uint256 balance) {
return balances[_owner];
}
function transfer(address _to, uint256 _value) public returns (bool) {
require(_to != address(0));
require(_value <= balances[msg.sender]);
// SafeMath.sub will throw if there is not enough balance.
balances[msg.sender] = balances[msg.sender].sub(_value);
balances[_to] = balances[_to].add(_value);
Transfer(msg.sender, _to, _value);
return true;
}
function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
require(_to != address(0));
require(_value <= balances[_from]);
require(_value <= allowed[_from][msg.sender]);
balances[_from] = balances[_from].sub(_value);
allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
balances[_to] = balances[_to].add(_value);
Transfer(_from, _to, _value);
return true;
}
function approve(address _spender, uint256 _value) public returns (bool) {
allowed[msg.sender][_spender] = _value;
Approval(msg.sender, _spender, _value);
return true;
}
function allowance(address _owner, address _spender) public view returns (uint256) {
return allowed[_owner][_spender];
}
function increaseApproval(address _spender, uint _addedValue) public returns (bool) {
allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
return true;
}
function decreaseApproval(address _spender, uint _subtractedValue) public returns (bool) {
uint oldValue = allowed[msg.sender][_spender];
if (_subtractedValue > oldValue) {
allowed[msg.sender][_spender] = 0;
} else {
allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
}
Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
return true;
}
/* Approve and then communicate the approved contract in a single tx */
function approveAndCall(address _spender, uint256 _value, bytes _extraData) public returns (bool success) {
tokenRecipient spender = tokenRecipient(_spender);
if (approve(_spender, _value)) {
spender.receiveApproval(msg.sender, _value, this, _extraData);
return true;
}
}
}
interface tokenRecipient {
function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData) external ;
}
contract Lescovex_ABT is LescovexERC20 {
// Contract variables and constants
uint256 public tokenPrice = 0;
// constant to simplify conversion of token amounts into integer form
uint256 public tokenUnit = uint256(10)**decimals;
//Declare logging events
event LogDeposit(address sender, uint amount);
/* Initializes contract with initial supply tokens to the creator of the contract */
function Lescovex_ABT(
uint256 initialSupply,
string contractName,
string tokenSymbol,
address contractOwner,
uint256 price
) public {
totalSupply = initialSupply; // Update total supply
name = contractName; // Set the name for display purposes
symbol = tokenSymbol; // Set the symbol for display purposes
owner = contractOwner;
balances[contractOwner] = balances[contractOwner].add(totalSupply);
tokenPrice = price;
}
}