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0b5191f15d
Add support for fs.write(fd, buffer, cb) and fs.write(fd, buffer, offset, cb) as documented at https://nodejs.org/api/fs.html#fs_fs_write_fd_data_position_encoding_callback and equivalently for fs.writeSync Update docs and code comments to reflect the implementation. PR-URL: https://github.com/nodejs/node/pull/7856 Reviewed-By: Sam Roberts <vieuxtech@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Brian White <mscdex@mscdex.net> Reviewed-By: Yorkie Liu <yorkiefixer@gmail.com> Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
109 lines
2.9 KiB
JavaScript
109 lines
2.9 KiB
JavaScript
'use strict';
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const common = require('../common');
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const assert = require('assert');
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const path = require('path');
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const fs = require('fs');
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const expected = Buffer.from('hello');
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common.refreshTmpDir();
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// fs.write with all parameters provided:
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{
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const filename = path.join(common.tmpDir, 'write1.txt');
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fs.open(filename, 'w', 0o644, common.mustCall(function(err, fd) {
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assert.ifError(err);
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const cb = common.mustCall(function(err, written) {
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assert.ifError(err);
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assert.strictEqual(expected.length, written);
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fs.closeSync(fd);
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var found = fs.readFileSync(filename, 'utf8');
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assert.deepStrictEqual(expected.toString(), found);
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});
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fs.write(fd, expected, 0, expected.length, null, cb);
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}));
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}
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// fs.write with a buffer, without the length parameter:
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{
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const filename = path.join(common.tmpDir, 'write2.txt');
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fs.open(filename, 'w', 0o644, common.mustCall(function(err, fd) {
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assert.ifError(err);
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const cb = common.mustCall(function(err, written) {
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assert.ifError(err);
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assert.strictEqual(2, written);
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fs.closeSync(fd);
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const found = fs.readFileSync(filename, 'utf8');
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assert.deepStrictEqual('lo', found);
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});
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fs.write(fd, Buffer.from('hello'), 3, cb);
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}));
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}
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// fs.write with a buffer, without the offset and length parameters:
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{
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const filename = path.join(common.tmpDir, 'write3.txt');
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fs.open(filename, 'w', 0o644, common.mustCall(function(err, fd) {
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assert.ifError(err);
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const cb = common.mustCall(function(err, written) {
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assert.ifError(err);
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assert.strictEqual(expected.length, written);
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fs.closeSync(fd);
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const found = fs.readFileSync(filename, 'utf8');
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assert.deepStrictEqual(expected.toString(), found);
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});
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fs.write(fd, expected, cb);
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}));
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}
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// fs.write with the offset passed as undefined followed by the callback:
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{
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const filename = path.join(common.tmpDir, 'write4.txt');
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fs.open(filename, 'w', 0o644, common.mustCall(function(err, fd) {
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assert.ifError(err);
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const cb = common.mustCall(function(err, written) {
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assert.ifError(err);
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assert.strictEqual(expected.length, written);
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fs.closeSync(fd);
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const found = fs.readFileSync(filename, 'utf8');
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assert.deepStrictEqual(expected.toString(), found);
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});
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fs.write(fd, expected, undefined, cb);
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}));
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}
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// fs.write with offset and length passed as undefined followed by the callback:
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{
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const filename = path.join(common.tmpDir, 'write5.txt');
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fs.open(filename, 'w', 0o644, common.mustCall(function(err, fd) {
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assert.ifError(err);
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const cb = common.mustCall(function(err, written) {
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assert.ifError(err);
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assert.strictEqual(expected.length, written);
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fs.closeSync(fd);
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const found = fs.readFileSync(filename, 'utf8');
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assert.deepStrictEqual(expected.toString(), found);
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});
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fs.write(fd, expected, undefined, undefined, cb);
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}));
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}
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