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// 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 (
"bytes";
"os";
)
// 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.Data(), 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;
}
f.Close();
return err;
}
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