to_symbolic.js (1507B)
1 /** 2 * @license Apache-2.0 3 * 4 * Copyright (c) 2018 The Stdlib Authors. 5 * 6 * Licensed under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 'use strict'; 20 21 // MODULES // 22 23 var lpad = require( '@stdlib/string/left-pad' ); 24 var OCTAL_CODES = require( './octal_codes.json' ); 25 26 27 // MAIN // 28 29 /** 30 * Converts an integer mask to symbolic notation. 31 * 32 * @private 33 * @param {NonNegativeInteger} mask - integer mask 34 * @returns {string} mask in symbolic notation 35 */ 36 function toSymbolic( mask ) { 37 var out; 38 39 // Convert the mask to a four-digit octal string representation (e.g., 0077): 40 mask = mask.toString( 8 ); 41 mask = lpad( mask, 4, '0' ); 42 43 // For each digit, get the permissions: (NOTE: we skip the special modes digit, as only the file permission bits of the mask are used; see http://man7.org/linux/man-pages/man2/umask.2.html) 44 out = ''; 45 out += 'u='+OCTAL_CODES[ mask[1] ]; 46 out += ','; 47 out += 'g='+OCTAL_CODES[ mask[2] ]; 48 out += ','; 49 out += 'o='+OCTAL_CODES[ mask[3] ]; 50 51 return out; 52 } 53 54 55 // EXPORTS // 56 57 module.exports = toSymbolic;