55 lines
2.0 KiB
Solidity
55 lines
2.0 KiB
Solidity
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// SPDX-License-Identifier: Proprietary
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pragma solidity ^0.7.2;
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library Strings {
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// via https://github.com/oraclize/ethereum-api/blob/master/oraclizeAPI_0.5.sol
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function strConcat(string memory _a, string memory _b, string memory _c, string memory _d, string memory _e) public pure returns (string memory) {
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bytes memory _ba = bytes(_a);
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bytes memory _bb = bytes(_b);
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bytes memory _bc = bytes(_c);
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bytes memory _bd = bytes(_d);
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bytes memory _be = bytes(_e);
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string memory abcde = new string(_ba.length + _bb.length + _bc.length + _bd.length + _be.length);
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bytes memory babcde = bytes(abcde);
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uint k = 0;
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for (uint i = 0; i < _ba.length; i++) babcde[k++] = _ba[i];
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for (uint i = 0; i < _bb.length; i++) babcde[k++] = _bb[i];
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for (uint i = 0; i < _bc.length; i++) babcde[k++] = _bc[i];
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for (uint i = 0; i < _bd.length; i++) babcde[k++] = _bd[i];
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for (uint i = 0; i < _be.length; i++) babcde[k++] = _be[i];
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return string(babcde);
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}
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function strConcat(string memory _a, string memory _b, string memory _c, string memory _d) public pure returns (string memory) {
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return strConcat(_a, _b, _c, _d, "");
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}
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function strConcat(string memory _a, string memory _b, string memory _c) public pure returns (string memory) {
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return strConcat(_a, _b, _c, "", "");
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}
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function strConcat(string memory _a, string memory _b) public pure returns (string memory) {
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return strConcat(_a, _b, "", "", "");
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}
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function uint2str(uint _i) public pure returns (string memory _uintAsString) {
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if (_i == 0) {
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return "0";
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}
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uint j = _i;
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uint len;
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while (j != 0) {
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len++;
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j /= 10;
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}
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bytes memory bstr = new bytes(len);
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uint k = len - 1;
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while (_i != 0) {
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bstr[k--] = byte(uint8(48 + _i % 10));
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_i /= 10;
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}
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return string(bstr);
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}
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}
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