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41 lines
1.2 KiB
41 lines
1.2 KiB
'use strict'; |
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var os = require('os'); |
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var equals = require('buffer-equal'); |
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var cr = new Buffer('\r\n'); |
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var nl = new Buffer('\n'); |
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/** |
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* Append a buffer to another buffer ensuring to preserve line ending characters. |
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* |
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* ```js |
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* console.log([appendBuffer(new Buffer('abc\r\n'), new Buffer('def')).toString()]); |
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* //=> [ 'abc\r\ndef\r\n' ] |
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* |
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* console.log([appendBuffer(new Buffer('abc\n'), new Buffer('def')).toString()]); |
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* //=> [ 'abc\ndef\n' ] |
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* |
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* // uses os.EOL when a line ending is not found |
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* console.log([appendBuffer(new Buffer('abc'), new Buffer('def')).toString()]); |
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* //=> [ 'abc\ndef' ] |
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* * ``` |
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* @param {Buffer} `buf` Buffer that will be used to check for an existing line ending. The suffix is appended to this. |
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* @param {Buffer} `suffix` Buffer that will be appended to the buf. |
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* @return {Buffer} Final Buffer |
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* @api public |
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*/ |
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module.exports = function appendBuffer(buf, suffix) { |
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if (!suffix || !suffix.length) { |
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return buf; |
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} |
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var eol; |
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if (equals(buf.slice(-2), cr)) { |
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eol = cr; |
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} else if (equals(buf.slice(-1), nl)) { |
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eol = nl; |
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} else { |
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return Buffer.concat([buf, new Buffer(os.EOL), new Buffer(suffix)]); |
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} |
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return Buffer.concat([buf, new Buffer(suffix), eol]); |
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};
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