webcaetano · August 6, 2018 14:15 · Aug 6, 2018
diff --git a/Utils.sol b/Utils.sol
@@ -0,0 +1,61 @@
+pragma solidity ^0.4.22;
+
+
+contract Utils {
+	function Utils() public {
+	}
+
+	// function compareStrings (string a, string b) view returns (bool){
+	// 	return keccak256(a) == keccak256(b);
+	// }
+
+	// // verifies that an amount is greater than zero
+	// modifier greaterThanZero(uint256 _amount) {
+	//     require(_amount > 0);
+	//     _;
+	// }
+
+	// validates an address - currently only checks that it isn't null
+	modifier validAddress(address _address) {
+	    require(_address != address(0));
+	    _;
+	}
+
+	// verifies that the address is different than this contract address
+	modifier notThis(address _address) {
+	    require(_address != address(this));
+	    _;
+	}
+
+	function strlen(string s) internal pure returns (uint) {
+		// Starting here means the LSB will be the byte we care about
+		uint ptr;
+		uint end;
+		assembly {
+			ptr := add(s, 1)
+			end := add(mload(s), ptr)
+		}
+
+		for (uint len = 0; ptr < end; len++) {
+			uint8 b;
+			assembly { b := and(mload(ptr), 0xFF) }
+			if (b < 0x80) {
+				ptr += 1;
+			} else if(b < 0xE0) {
+				ptr += 2;
+			} else if(b < 0xF0) {
+				ptr += 3;
+			} else if(b < 0xF8) {
+				ptr += 4;
+			} else if(b < 0xFC) {
+				ptr += 5;
+			} else {
+				ptr += 6;
+			}
+		}
+
+		return len;
+	}
+
+
+}
diff --git a/bundinha.sol b/bundinha.sol
@@ -0,0 +1,27 @@
+pragma solidity ^0.4.22;
+
+import './Utils.sol';
+
+contract bundinha is Utils {
+	uint N;
+	string bundinha;
+
+
+	function setN(uint x) public {
+		N = x;
+	}
+
+	function getN() constant public returns (uint) {
+		return N;
+	}
+
+	function setBundinha(string x) public {
+		require(strlen(x) <= 32);
+		bundinha = x;
+	}
+
+	function getBundinha() constant public returns (string){
+		return bundinha;
+	}
+
+}