eth-erc20

commit eb2b89b13e5d9ac931e64415c547621b002fdecd
parent 30baee6d198dff8b6a5904840fe832c45589a8e4
Author: nolash <dev@holbrook.no>
Date:   Sun,  6 Dec 2020 17:37:50 +0100

Add makefile

Diffstat:
M
solidity/GiftableToken.bin
 | 
4
++--
M
solidity/GiftableToken.sol
 | 
3
+++

2 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/solidity/GiftableToken.bin b/solidity/GiftableToken.bin
@@ -1 +1 @@
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-\ No newline at end of file
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+\ No newline at end of file
diff --git a/solidity/GiftableToken.sol b/solidity/GiftableToken.sol
@@ -52,6 +52,7 @@ contract GiftableToken {
 	}
 
 	function transfer(address _to, uint256 _value) public returns (bool) {
+		require(balanceOf[msg.sender] >= _value);
 		balanceOf[msg.sender] -= _value; 
 		balanceOf[_to] += _value;
 		emit Transfer(msg.sender, _to, _value);
@@ -59,6 +60,8 @@ contract GiftableToken {
 	}
 
 	function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
+		require(allowances[_from][msg.sender] >= _value);
+		require(balanceOf[_from] >= _value);
 		allowances[_from][msg.sender] = allowances[_from][msg.sender] - _value;
 		balanceOf[_from] -= _value; 
 		balanceOf[_to] += _value;