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67 lines
1.9 KiB
67 lines
1.9 KiB
// SPDX-License-Identifier: MIT
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pragma solidity ^0.8.0;
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/**
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* @dev String operations.
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*/
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library Strings {
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bytes16 private constant alphabet = "0123456789abcdef";
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/**
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* @dev Converts a `uint256` to its ASCII `string` decimal representation.
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*/
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function toString(uint256 value) internal pure returns (string memory) {
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// Inspired by OraclizeAPI's implementation - MIT licence
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// https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol
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if (value == 0) {
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return "0";
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}
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uint256 temp = value;
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uint256 digits;
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while (temp != 0) {
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digits++;
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temp /= 10;
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}
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bytes memory buffer = new bytes(digits);
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while (value != 0) {
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digits -= 1;
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buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
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value /= 10;
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}
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return string(buffer);
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}
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/**
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* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
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*/
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function toHexString(uint256 value) internal pure returns (string memory) {
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if (value == 0) {
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return "0x00";
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}
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uint256 temp = value;
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uint256 length = 0;
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while (temp != 0) {
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length++;
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temp >>= 8;
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}
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return toHexString(value, length);
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}
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/**
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* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
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*/
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function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
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bytes memory buffer = new bytes(2 * length + 2);
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buffer[0] = "0";
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buffer[1] = "x";
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for (uint256 i = 2 * length + 1; i > 1; --i) {
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buffer[i] = alphabet[value & 0xf];
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value >>= 4;
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}
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require(value == 0, "Strings: hex length insufficient");
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return string(buffer);
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}
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}
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