diff options
author | Fabio Berger <me@fabioberger.com> | 2018-07-02 17:12:01 +0800 |
---|---|---|
committer | Fabio Berger <me@fabioberger.com> | 2018-07-02 17:12:01 +0800 |
commit | de9f0732a09893f035ce8a7e8e01fa1141882a3a (patch) | |
tree | 63d1f0bbc6f9d65576e5d12b379378700eb88567 /packages/contracts/src/2.0.0/tokens/ERC20Token/ERC20Token.sol | |
parent | 20acdbf6c3ba6a62e87a9a496021cb6482c0c03a (diff) | |
parent | b9b00e10d39c3c84bc72892ef37f1313e904414d (diff) | |
download | dexon-sol-tools-de9f0732a09893f035ce8a7e8e01fa1141882a3a.tar dexon-sol-tools-de9f0732a09893f035ce8a7e8e01fa1141882a3a.tar.gz dexon-sol-tools-de9f0732a09893f035ce8a7e8e01fa1141882a3a.tar.bz2 dexon-sol-tools-de9f0732a09893f035ce8a7e8e01fa1141882a3a.tar.lz dexon-sol-tools-de9f0732a09893f035ce8a7e8e01fa1141882a3a.tar.xz dexon-sol-tools-de9f0732a09893f035ce8a7e8e01fa1141882a3a.tar.zst dexon-sol-tools-de9f0732a09893f035ce8a7e8e01fa1141882a3a.zip |
Merge branch 'v2-prototype' into fix/five_decimal_scenario
* v2-prototype: (75 commits)
Update relayer grid tiles to use Text
Fix build
Update file structure
Update 2.0.0 artifacts
Move ledgerhq module declarations to typescript-typings
Export LedgerEthereumClient type in subproviders
Update artifacts
Add logging and updated artifacts
Fix migrations
Run prettier
Add Kovan artifacts
Use ledger subprovider
Add Kovan migrations
Remove state variable from Link component in Portal
Make registerAssetProxy append only
Update staging api link
Change getTransactionReceipt to awaitTransactionMined
Move /docs route to the end
Remove extra call to scrollIntoView for wallet in onboarding
Update expectRevertReasonOrAlwaysFailingTransactionAsync to check status codes
...
Diffstat (limited to 'packages/contracts/src/2.0.0/tokens/ERC20Token/ERC20Token.sol')
-rw-r--r-- | packages/contracts/src/2.0.0/tokens/ERC20Token/ERC20Token.sol | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/packages/contracts/src/2.0.0/tokens/ERC20Token/ERC20Token.sol b/packages/contracts/src/2.0.0/tokens/ERC20Token/ERC20Token.sol new file mode 100644 index 000000000..b6961a6ec --- /dev/null +++ b/packages/contracts/src/2.0.0/tokens/ERC20Token/ERC20Token.sol @@ -0,0 +1,99 @@ +/* + + Copyright 2018 ZeroEx Intl. + + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. + +*/ + +pragma solidity ^0.4.24; +pragma experimental ABIEncoderV2; + +import "./IERC20Token.sol"; + +contract ERC20Token is IERC20Token { + + string constant INSUFFICIENT_BALANCE = "ERC20_INSUFFICIENT_BALANCE"; + string constant INSUFFICIENT_ALLOWANCE = "ERC20_INSUFFICIENT_ALLOWANCE"; + string constant OVERFLOW = "Transfer would result in an overflow."; + + mapping (address => uint256) balances; + mapping (address => mapping (address => uint256)) allowed; + + uint256 public totalSupply; + + function transfer(address _to, uint256 _value) + public + returns (bool) + { + require( + balances[msg.sender] >= _value, + INSUFFICIENT_BALANCE + ); + require( + balances[_to] + _value >= balances[_to], + OVERFLOW + ); + balances[msg.sender] -= _value; + balances[_to] += _value; + emit Transfer(msg.sender, _to, _value); + return true; + } + + function transferFrom(address _from, address _to, uint256 _value) + public + returns (bool) + { + require( + balances[_from] >= _value, + INSUFFICIENT_BALANCE + ); + require( + allowed[_from][msg.sender] >= _value, + INSUFFICIENT_ALLOWANCE + ); + require( + balances[_to] + _value >= balances[_to], + OVERFLOW + ); + balances[_to] += _value; + balances[_from] -= _value; + allowed[_from][msg.sender] -= _value; + emit Transfer(_from, _to, _value); + return true; + } + + function approve(address _spender, uint256 _value) + public + returns (bool) + { + allowed[msg.sender][_spender] = _value; + emit Approval(msg.sender, _spender, _value); + return true; + } + + function balanceOf(address _owner) + public view + returns (uint256) + { + return balances[_owner]; + } + + function allowance(address _owner, address _spender) + public + view + returns (uint256) + { + return allowed[_owner][_spender]; + } +} |