Contract Source Code:
File 1 of 1 : Ammbr
pragma solidity 0.4.21;
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);
uint256 c = a / b;
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 ERC20 {
uint256 public totalSupply;
function balanceOf(address who) view public returns (uint256);
function transfer(address to, uint256 value) public returns (bool);
function allowance(address owner, address spender) view public returns (uint256);
function transferFrom(address from, address to, uint256 value) public returns (bool);
function approve(address spender, uint256 value) public returns (bool);
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
}
contract Ownable {
address owner;
function Ownable() public{
owner = msg.sender;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner(){
require(msg.sender == owner);
_;
}
/**
* @dev Allows the current owner to transfer control of the contract to a newOwner.
* @param newOwner The address to transfer ownership to.
*/
function transferOwnership(address newOwner) onlyOwner public{
assert(newOwner != address(0));
owner = newOwner;
}
}
contract StandardToken is ERC20 {
using SafeMath for uint256;
mapping (address => mapping (address => uint256)) allowed;
mapping(address => uint256) balances;
/**
* @dev transfer token for a specified address
* @param _to The address to transfer to.
* @param _value The amount to be transferred.
*/
function transfer(address _to, uint256 _value) public returns (bool){
// require(0 < _value); -- REMOVED AS REQUESTED BY AUDIT
require(balances[msg.sender] >= _value);
balances[msg.sender] = balances[msg.sender].sub(_value);
balances[_to] = balances[_to].add(_value);
emit Transfer(msg.sender, _to, _value);
return true;
}
/**
* @dev Gets the balance of the specified address.
* @param _owner The address to query the balance of.
* @return An uint256 representing the amount owned by the passed address.
*/
function balanceOf(address _owner) view public returns (uint256 balance){
return balances[_owner];
}
/**
* @dev Transfer tokens from one address to another
* @param _from address The address which you want to send tokens from
* @param _to address The address which you want to transfer to
* @param _value uint256 the amout of tokens to be transfered
*/
function transferFrom(address _from, address _to, uint256 _value) public returns (bool){
uint256 _allowance = allowed[_from][msg.sender];
require (balances[_from] >= _value);
require (_allowance >= _value);
// require (_value > 0); // NOTE: Removed due to audit demand (transfer of 0 should be authorized)
// require ( balances[_to] + _value > balances[_to]);
// Check is not needed because sub(_allowance, _value) will already throw if this condition is not met
// require (_value <= _allowance);
balances[_to] = balances[_to].add(_value);
balances[_from] = balances[_from].sub(_value);
allowed[_from][msg.sender] = _allowance.sub(_value);
emit Transfer(_from, _to, _value);
return true;
}
/**
* @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
* @param _spender The address which will spend the funds.
* @param _value The amount of tokens to be spent.
*/
function approve(address _spender, uint256 _value) public returns (bool){
// To change the approve amount you first have to reduce the addresses`
// allowance to zero by calling `approve(_spender, 0)` if it is not
// already 0 to mitigate the race condition described here:
// https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
require((_value == 0) || (allowed[msg.sender][_spender] == 0));
allowed[msg.sender][_spender] = _value;
emit Approval(msg.sender, _spender, _value);
return true;
}
/**
* @dev Function to check the amount of tokens that an owner allowed to a spender.
* @param _owner address The address which owns the funds.
* @param _spender address The address which will spend the funds.
* @return A uint256 specifing the amount of tokens still available for the spender.
*/
function allowance(address _owner, address _spender) view public returns (uint256 remaining){
return allowed[_owner][_spender];
}
}
contract Ammbr is StandardToken, Ownable {
string public name = '';
string public symbol = '';
uint8 public decimals = 0;
uint256 public maxMintBlock = 0;
event Mint(address indexed to, uint256 amount);
/**
* @dev Function to mint tokens
* @param _to The address that will recieve the minted tokens.
* @param _amount The amount of tokens to mint.
* @return A boolean that indicates if the operation was successful.
*/
function mint(address _to, uint256 _amount) onlyOwner public returns (bool){
require(maxMintBlock == 0);
totalSupply = totalSupply.add(_amount);
balances[_to] = balances[_to].add(_amount);
emit Mint(_to, _amount);
emit Transfer(0, _to, _amount); // ADDED AS REQUESTED BY AUDIT
maxMintBlock = 1;
return true;
}
/**
* @dev Function is used to perform a multi-transfer operation. This could play a significant role in the Ammbr Mesh Routing protocol.
*
* Mechanics:
* Sends tokens from Sender to destinations[0..n] the amount tokens[0..n]. Both arrays
* must have the same size, and must have a greater-than-zero length. Max array size is 127.
*
* IMPORTANT: ANTIPATTERN
* This function performs a loop over arrays. Unless executed in a controlled environment,
* it has the potential of failing due to gas running out. This is not dangerous, yet care
* must be taken to prevent quality being affected.
*
* @param destinations An array of destinations we would be sending tokens to
* @param tokens An array of tokens, sent to destinations (index is used for destination->token match)
*/
function multiTransfer(address[] destinations, uint256[] tokens) public returns (bool success){
// Two variables must match in length, and must contain elements
// Plus, a maximum of 127 transfers are supported
require(destinations.length > 0);
require(destinations.length < 128);
require(destinations.length == tokens.length);
// Check total requested balance
uint8 i = 0;
uint256 totalTokensToTransfer = 0;
for (i = 0; i < destinations.length; i++){
require(tokens[i] > 0);
// Prevent Integer-Overflow by using Safe-Math
totalTokensToTransfer = totalTokensToTransfer.add(tokens[i]);
}
// Do we have enough tokens in hand?
// Note: Although we are testing this here, the .sub() function of
// SafeMath would fail if the operation produces a negative result
require (balances[msg.sender] > totalTokensToTransfer);
// We have enough tokens, execute the transfer
balances[msg.sender] = balances[msg.sender].sub(totalTokensToTransfer);
for (i = 0; i < destinations.length; i++){
// Add the token to the intended destination
balances[destinations[i]] = balances[destinations[i]].add(tokens[i]);
// Call the event...
emit Transfer(msg.sender, destinations[i], tokens[i]);
}
return true;
}
function Ammbr(string _name , string _symbol , uint8 _decimals) public{
name = _name;
symbol = _symbol;
decimals = _decimals;
}
}