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'use strict';
var common = require('../common');
var assert = require('assert');
var path = require('path');
var fs = require('fs');
var tmp = common.tmpDir;
var filename = path.resolve(tmp, 'truncate-file.txt');
var data = Buffer.alloc(1024 * 16, 'x');
common.refreshTmpDir();
var stat;
// truncateSync
fs.writeFileSync(filename, data);
stat = fs.statSync(filename);
assert.equal(stat.size, 1024 * 16);
fs.truncateSync(filename, 1024);
stat = fs.statSync(filename);
assert.equal(stat.size, 1024);
fs.truncateSync(filename);
stat = fs.statSync(filename);
assert.equal(stat.size, 0);
// ftruncateSync
fs.writeFileSync(filename, data);
var fd = fs.openSync(filename, 'r+');
stat = fs.statSync(filename);
assert.equal(stat.size, 1024 * 16);
fs.ftruncateSync(fd, 1024);
stat = fs.statSync(filename);
assert.equal(stat.size, 1024);
fs.ftruncateSync(fd);
stat = fs.statSync(filename);
assert.equal(stat.size, 0);
fs.closeSync(fd);
// async tests
var success = 0;
testTruncate(function(er) {
if (er) throw er;
success++;
testFtruncate(function(er) {
if (er) throw er;
success++;
});
});
process.on('exit', function() {
assert.equal(success, 2);
console.log('ok');
});
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.equal(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.equal(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.equal(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.equal(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.equal(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.equal(stat.size, 0);
fs.close(fd, cb);
});
});
});
});
});
});
});
}
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