blob: 78b8320ecaa87a03a8c590f0fed1b13f484d9e6c [file] [log] [blame]
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Utility functions.
package io
import (
// ReadAll reads from r until an error or EOF and returns the data it read.
func ReadAll(r Reader) ([]byte, os.Error) {
var buf bytes.Buffer;
_, err := Copy(r, &buf);
return buf.Bytes(), err;
// ReadFile reads the file named by filename and returns the contents.
func ReadFile(filename string) ([]byte, os.Error) {
f, err := os.Open(filename, os.O_RDONLY, 0);
if err != nil {
return nil, err;
defer f.Close();
return ReadAll(f);
// WriteFile writes data to a file named by filename.
// If the file does not exist, WriteFile creates it with permissions perm;
// otherwise WriteFile truncates it before writing.
func WriteFile(filename string, data []byte, perm int) os.Error {
f, err := os.Open(filename, os.O_WRONLY | os.O_CREAT | os.O_TRUNC, perm);
if err != nil {
return err;
n, err := f.Write(data);
if err == nil && n < len(data) {
err = ErrShortWrite;
return err;