58 lines
1.5 KiB
JavaScript
58 lines
1.5 KiB
JavaScript
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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2018 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var lpad = require( '@stdlib/string/left-pad' );
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var OCTAL_CODES = require( './octal_codes.json' );
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// MAIN //
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/**
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* Converts an integer mask to symbolic notation.
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*
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* @private
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* @param {NonNegativeInteger} mask - integer mask
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* @returns {string} mask in symbolic notation
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*/
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function toSymbolic( mask ) {
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var out;
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// Convert the mask to a four-digit octal string representation (e.g., 0077):
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mask = mask.toString( 8 );
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mask = lpad( mask, 4, '0' );
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// 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)
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out = '';
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out += 'u='+OCTAL_CODES[ mask[1] ];
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out += ',';
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out += 'g='+OCTAL_CODES[ mask[2] ];
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out += ',';
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out += 'o='+OCTAL_CODES[ mask[3] ];
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return out;
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}
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// EXPORTS //
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module.exports = toSymbolic;
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