64 lines
1.2 KiB
Go
64 lines
1.2 KiB
Go
// Copyright (C) 2014 The Syncthing Authors.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this file,
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// You can obtain one at https://mozilla.org/MPL/2.0/.
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package osutil
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import (
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"bytes"
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"io"
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"github.com/syncthing/syncthing/lib/build"
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)
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type ReplacingWriter struct {
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Writer io.Writer
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From byte
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To []byte
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}
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func (w ReplacingWriter) Write(bs []byte) (int, error) {
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var n, written int
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var err error
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newlineIdx := bytes.IndexByte(bs, w.From)
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for newlineIdx >= 0 {
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n, err = w.Writer.Write(bs[:newlineIdx])
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written += n
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if err != nil {
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break
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}
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if len(w.To) > 0 {
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n, err := w.Writer.Write(w.To)
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if n == len(w.To) {
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written++
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}
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if err != nil {
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break
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}
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}
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bs = bs[newlineIdx+1:]
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newlineIdx = bytes.IndexByte(bs, w.From)
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}
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n, err = w.Writer.Write(bs)
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written += n
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return written, err
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}
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// LineEndingsWriter returns a writer that writes platform-appropriate line
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// endings. (This is a no-op on non-Windows platforms.)
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func LineEndingsWriter(w io.Writer) io.Writer {
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if !build.IsWindows {
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return w
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}
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return &ReplacingWriter{
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Writer: w,
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From: '\n',
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To: []byte{'\r', '\n'},
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}
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}
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