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aj0strow/DSToken.sol

Created October 1, 2018 22:19
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  1. aj0strow created this gist Oct 1, 2018.
    376 changes: 376 additions & 0 deletions DSToken.sol
    View file
    Original file line number Diff line number Diff line change
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    contract DSNote {
    event LogNote(
    bytes4 indexed sig,
    address indexed guy,
    bytes32 indexed foo,
    bytes32 indexed bar,
    uint wad,
    bytes fax
    ) anonymous;

    modifier note {
    bytes32 foo;
    bytes32 bar;

    assembly {
    foo := calldataload(4)
    bar := calldataload(36)
    }

    LogNote(msg.sig, msg.sender, foo, bar, msg.value, msg.data);

    _;
    }
    }

    contract DSAuthority {
    function canCall(
    address src, address dst, bytes4 sig
    ) constant returns (bool);
    }

    contract DSAuthEvents {
    event LogSetAuthority (address indexed authority);
    event LogSetOwner (address indexed owner);
    }

    contract DSAuth is DSAuthEvents {
    DSAuthority public authority;
    address public owner;

    function DSAuth() {
    owner = msg.sender;
    LogSetOwner(msg.sender);
    }

    function setOwner(address owner_)
    auth
    {
    owner = owner_;
    LogSetOwner(owner);
    }

    function setAuthority(DSAuthority authority_)
    auth
    {
    authority = authority_;
    LogSetAuthority(authority);
    }

    modifier auth {
    assert(isAuthorized(msg.sender, msg.sig));
    _;
    }

    modifier authorized(bytes4 sig) {
    assert(isAuthorized(msg.sender, sig));
    _;
    }

    function isAuthorized(address src, bytes4 sig) internal returns (bool) {
    if (src == address(this)) {
    return true;
    } else if (src == owner) {
    return true;
    } else if (authority == DSAuthority(0)) {
    return false;
    } else {
    return authority.canCall(src, this, sig);
    }
    }

    function assert(bool x) internal {
    if (!x) throw;
    }
    }

    contract DSStop is DSAuth, DSNote {

    bool public stopped;

    modifier stoppable {
    assert (!stopped);
    _;
    }
    function stop() auth note {
    stopped = true;
    }
    function start() auth note {
    stopped = false;
    }

    }

    contract DSMath {

    /*
    standard uint256 functions
    */

    function add(uint256 x, uint256 y) constant internal returns (uint256 z) {
    assert((z = x + y) >= x);
    }

    function sub(uint256 x, uint256 y) constant internal returns (uint256 z) {
    assert((z = x - y) <= x);
    }

    function mul(uint256 x, uint256 y) constant internal returns (uint256 z) {
    assert((z = x * y) >= x);
    }

    function div(uint256 x, uint256 y) constant internal returns (uint256 z) {
    z = x / y;
    }

    function min(uint256 x, uint256 y) constant internal returns (uint256 z) {
    return x <= y ? x : y;
    }
    function max(uint256 x, uint256 y) constant internal returns (uint256 z) {
    return x >= y ? x : y;
    }

    /*
    uint128 functions (h is for half)
    */


    function hadd(uint128 x, uint128 y) constant internal returns (uint128 z) {
    assert((z = x + y) >= x);
    }

    function hsub(uint128 x, uint128 y) constant internal returns (uint128 z) {
    assert((z = x - y) <= x);
    }

    function hmul(uint128 x, uint128 y) constant internal returns (uint128 z) {
    assert((z = x * y) >= x);
    }

    function hdiv(uint128 x, uint128 y) constant internal returns (uint128 z) {
    z = x / y;
    }

    function hmin(uint128 x, uint128 y) constant internal returns (uint128 z) {
    return x <= y ? x : y;
    }
    function hmax(uint128 x, uint128 y) constant internal returns (uint128 z) {
    return x >= y ? x : y;
    }


    /*
    int256 functions
    */

    function imin(int256 x, int256 y) constant internal returns (int256 z) {
    return x <= y ? x : y;
    }
    function imax(int256 x, int256 y) constant internal returns (int256 z) {
    return x >= y ? x : y;
    }

    /*
    WAD math
    */

    uint128 constant WAD = 10 ** 18;

    function wadd(uint128 x, uint128 y) constant internal returns (uint128) {
    return hadd(x, y);
    }

    function wsub(uint128 x, uint128 y) constant internal returns (uint128) {
    return hsub(x, y);
    }

    function wmul(uint128 x, uint128 y) constant internal returns (uint128 z) {
    z = cast((uint256(x) * y + WAD / 2) / WAD);
    }

    function wdiv(uint128 x, uint128 y) constant internal returns (uint128 z) {
    z = cast((uint256(x) * WAD + y / 2) / y);
    }

    function wmin(uint128 x, uint128 y) constant internal returns (uint128) {
    return hmin(x, y);
    }
    function wmax(uint128 x, uint128 y) constant internal returns (uint128) {
    return hmax(x, y);
    }

    /*
    RAY math
    */

    uint128 constant RAY = 10 ** 27;

    function radd(uint128 x, uint128 y) constant internal returns (uint128) {
    return hadd(x, y);
    }

    function rsub(uint128 x, uint128 y) constant internal returns (uint128) {
    return hsub(x, y);
    }

    function rmul(uint128 x, uint128 y) constant internal returns (uint128 z) {
    z = cast((uint256(x) * y + RAY / 2) / RAY);
    }

    function rdiv(uint128 x, uint128 y) constant internal returns (uint128 z) {
    z = cast((uint256(x) * RAY + y / 2) / y);
    }

    function rpow(uint128 x, uint64 n) constant internal returns (uint128 z) {
    // This famous algorithm is called "exponentiation by squaring"
    // and calculates x^n with x as fixed-point and n as regular unsigned.
    //
    // It's O(log n), instead of O(n) for naive repeated multiplication.
    //
    // These facts are why it works:
    //
    // If n is even, then x^n = (x^2)^(n/2).
    // If n is odd, then x^n = x * x^(n-1),
    // and applying the equation for even x gives
    // x^n = x * (x^2)^((n-1) / 2).
    //
    // Also, EVM division is flooring and
    // floor[(n-1) / 2] = floor[n / 2].

    z = n % 2 != 0 ? x : RAY;

    for (n /= 2; n != 0; n /= 2) {
    x = rmul(x, x);

    if (n % 2 != 0) {
    z = rmul(z, x);
    }
    }
    }

    function rmin(uint128 x, uint128 y) constant internal returns (uint128) {
    return hmin(x, y);
    }
    function rmax(uint128 x, uint128 y) constant internal returns (uint128) {
    return hmax(x, y);
    }

    function cast(uint256 x) constant internal returns (uint128 z) {
    assert((z = uint128(x)) == x);
    }

    }

    contract ERC20 {
    function totalSupply() constant returns (uint supply);
    function balanceOf( address who ) constant returns (uint value);
    function allowance( address owner, address spender ) constant returns (uint _allowance);

    function transfer( address to, uint value) returns (bool ok);
    function transferFrom( address from, address to, uint value) returns (bool ok);
    function approve( address spender, uint value ) returns (bool ok);

    event Transfer( address indexed from, address indexed to, uint value);
    event Approval( address indexed owner, address indexed spender, uint value);
    }

    contract DSTokenBase is ERC20, DSMath {
    uint256 _supply;
    mapping (address => uint256) _balances;
    mapping (address => mapping (address => uint256)) _approvals;

    function DSTokenBase(uint256 supply) {
    _balances[msg.sender] = supply;
    _supply = supply;
    }

    function totalSupply() constant returns (uint256) {
    return _supply;
    }
    function balanceOf(address src) constant returns (uint256) {
    return _balances[src];
    }
    function allowance(address src, address guy) constant returns (uint256) {
    return _approvals[src][guy];
    }

    function transfer(address dst, uint wad) returns (bool) {
    assert(_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;
    }

    function transferFrom(address src, address dst, uint wad) returns (bool) {
    assert(_balances[src] >= wad);
    assert(_approvals[src][msg.sender] >= wad);

    _approvals[src][msg.sender] = sub(_approvals[src][msg.sender], wad);
    _balances[src] = sub(_balances[src], wad);
    _balances[dst] = add(_balances[dst], wad);

    Transfer(src, dst, wad);

    return true;
    }

    function approve(address guy, uint256 wad) returns (bool) {
    _approvals[msg.sender][guy] = wad;

    Approval(msg.sender, guy, wad);

    return true;
    }

    }

    contract DSToken is DSTokenBase(0), DSStop {

    bytes32 public symbol;
    uint256 public decimals = 18; // standard token precision. override to customize

    function DSToken(bytes32 symbol_) {
    symbol = symbol_;
    }

    function transfer(address dst, uint wad) stoppable note returns (bool) {
    return super.transfer(dst, wad);
    }
    function transferFrom(
    address src, address dst, uint wad
    ) stoppable note returns (bool) {
    return super.transferFrom(src, dst, wad);
    }
    function approve(address guy, uint wad) stoppable note returns (bool) {
    return super.approve(guy, wad);
    }

    function push(address dst, uint128 wad) returns (bool) {
    return transfer(dst, wad);
    }
    function pull(address src, uint128 wad) returns (bool) {
    return transferFrom(src, msg.sender, wad);
    }

    function mint(uint128 wad) auth stoppable note {
    _balances[msg.sender] = add(_balances[msg.sender], wad);
    _supply = add(_supply, wad);
    }
    function burn(uint128 wad) auth stoppable note {
    _balances[msg.sender] = sub(_balances[msg.sender], wad);
    _supply = sub(_supply, wad);
    }

    // Optional token name

    bytes32 public name = "";

    function setName(bytes32 name_) auth {
    name = name_;
    }

    }