58 lines
1.3 KiB
Go
58 lines
1.3 KiB
Go
// Copyright (C) 2014 The Syncthing Authors.
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//
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// This program is free software: you can redistribute it and/or modify it
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// under the terms of the GNU General Public License as published by the Free
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// Software Foundation, either version 3 of the License, or (at your option)
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// any later version.
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//
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// This program is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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// more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this program. If not, see <http://www.gnu.org/licenses/>.
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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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)
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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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