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- // Copyright (C) 2014 The Syncthing Authors.
- //
- // This Source Code Form is subject to the terms of the Mozilla Public
- // License, v. 2.0. If a copy of the MPL was not distributed with this file,
- // You can obtain one at https://mozilla.org/MPL/2.0/.
- package osutil
- import (
- "bytes"
- "io"
- )
- type ReplacingWriter struct {
- Writer io.Writer
- From byte
- To []byte
- }
- func (w ReplacingWriter) Write(bs []byte) (int, error) {
- var n, written int
- var err error
- newlineIdx := bytes.IndexByte(bs, w.From)
- for newlineIdx >= 0 {
- n, err = w.Writer.Write(bs[:newlineIdx])
- written += n
- if err != nil {
- break
- }
- if len(w.To) > 0 {
- n, err := w.Writer.Write(w.To)
- if n == len(w.To) {
- written++
- }
- if err != nil {
- break
- }
- }
- bs = bs[newlineIdx+1:]
- newlineIdx = bytes.IndexByte(bs, w.From)
- }
- n, err = w.Writer.Write(bs)
- written += n
- return written, err
- }
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