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'use strict';
const common = require('../common');
const assert = require('assert');
const path = require('path');
const fs = require('fs');
const tmp = common.tmpDir;
const filename = path.resolve(tmp, 'truncate-file.txt');
const data = Buffer.alloc(1024 * 16, 'x');
common.refreshTmpDir();
let stat;
// truncateSync
fs.writeFileSync(filename, data);
stat = fs.statSync(filename);
assert.strictEqual(stat.size, 1024 * 16);
fs.truncateSync(filename, 1024);
stat = fs.statSync(filename);
assert.strictEqual(stat.size, 1024);
fs.truncateSync(filename);
stat = fs.statSync(filename);
assert.strictEqual(stat.size, 0);
// ftruncateSync
fs.writeFileSync(filename, data);
const fd = fs.openSync(filename, 'r+');
stat = fs.statSync(filename);
assert.strictEqual(stat.size, 1024 * 16);
fs.ftruncateSync(fd, 1024);
stat = fs.statSync(filename);
assert.strictEqual(stat.size, 1024);
fs.ftruncateSync(fd);
stat = fs.statSync(filename);
assert.strictEqual(stat.size, 0);
fs.closeSync(fd);
// async tests
testTruncate(common.mustCall(function(er) {
assert.ifError(er);
testFtruncate(common.mustCall(function(er) {
assert.ifError(er);
}));
}));
function testTruncate(cb) {
fs.writeFile(filename, data, function(er) {
if (er) return cb(er);
fs.stat(filename, function(er, stat) {
if (er) return cb(er);
assert.strictEqual(stat.size, 1024 * 16);
fs.truncate(filename, 1024, function(er) {
if (er) return cb(er);
fs.stat(filename, function(er, stat) {
if (er) return cb(er);
assert.strictEqual(stat.size, 1024);
fs.truncate(filename, function(er) {
if (er) return cb(er);
fs.stat(filename, function(er, stat) {
if (er) return cb(er);
assert.strictEqual(stat.size, 0);
cb();
});
});
});
});
});
});
}
function testFtruncate(cb) {
fs.writeFile(filename, data, function(er) {
if (er) return cb(er);
fs.stat(filename, function(er, stat) {
if (er) return cb(er);
assert.strictEqual(stat.size, 1024 * 16);
fs.open(filename, 'w', function(er, fd) {
if (er) return cb(er);
fs.ftruncate(fd, 1024, function(er) {
if (er) return cb(er);
fs.stat(filename, function(er, stat) {
if (er) return cb(er);
assert.strictEqual(stat.size, 1024);
fs.ftruncate(fd, function(er) {
if (er) return cb(er);
fs.stat(filename, function(er, stat) {
if (er) return cb(er);
assert.strictEqual(stat.size, 0);
fs.close(fd, cb);
});
});
});
});
});
});
});
}
// Make sure if the size of the file is smaller than the length then it is
// filled with zeroes.
{
const file1 = path.resolve(tmp, 'truncate-file-1.txt');
fs.writeFileSync(file1, 'Hi');
fs.truncateSync(file1, 4);
assert(fs.readFileSync(file1).equals(Buffer.from('Hi\u0000\u0000')));
}
{
const file2 = path.resolve(tmp, 'truncate-file-2.txt');
fs.writeFileSync(file2, 'Hi');
const fd = fs.openSync(file2, 'r+');
process.on('exit', () => fs.closeSync(fd));
fs.ftruncateSync(fd, 4);
assert(fs.readFileSync(file2).equals(Buffer.from('Hi\u0000\u0000')));
}
{
const file3 = path.resolve(tmp, 'truncate-file-3.txt');
fs.writeFileSync(file3, 'Hi');
fs.truncate(file3, 4, common.mustCall(function(err) {
assert.ifError(err);
assert(fs.readFileSync(file3).equals(Buffer.from('Hi\u0000\u0000')));
}));
}
{
const file4 = path.resolve(tmp, 'truncate-file-4.txt');
fs.writeFileSync(file4, 'Hi');
const fd = fs.openSync(file4, 'r+');
process.on('exit', () => fs.closeSync(fd));
fs.ftruncate(fd, 4, common.mustCall(function(err) {
assert.ifError(err);
assert(fs.readFileSync(file4).equals(Buffer.from('Hi\u0000\u0000')));
}));
}
{
const file5 = path.resolve(tmp, 'truncate-file-5.txt');
fs.writeFileSync(file5, 'Hi');
const fd = fs.openSync(file5, 'r+');
process.on('exit', () => fs.closeSync(fd));
fs.ftruncate(fd, undefined, common.mustCall(function(err) {
assert.ifError(err);
assert(fs.readFileSync(file5).equals(Buffer.from('')));
}));
}
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