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// SPDX-License-Identifier: MIT | |
// Source: | |
// https://github.com/ensdomains/ens-contracts/blob/master/contracts/ethregistrar/StringUtils.sol | |
pragma solidity >=0.8.4; | |
library StringUtils { | |
/** | |
* @dev Returns the length of a given string | |
* | |
* @param s The string to measure the length of | |
* @return The length of the input string | |
*/ | |
function strlen(string memory s) internal pure returns (uint) { | |
uint len; | |
uint i = 0; | |
uint bytelength = bytes(s).length; | |
for(len = 0; i < bytelength; len++) { | |
bytes1 b = bytes(s)[i]; | |
if(b < 0x80) { | |
i += 1; | |
} else if (b < 0xE0) { | |
i += 2; | |
} else if (b < 0xF0) { | |
i += 3; | |
} else if (b < 0xF8) { | |
i += 4; | |
} else if (b < 0xFC) { | |
i += 5; | |
} else { | |
i += 6; | |
} | |
} | |
return len; | |
} | |
} |
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