crlf.go

Documentation: k8s.io/kubectl/pkg/cmd/util/editor/crlf

     1  /*
     2  Copyright 2015 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package crlf
    18  
    19  import (
    20  	"bytes"
    21  	"io"
    22  )
    23  
    24  type crlfWriter struct {
    25  	io.Writer
    26  }
    27  
    28  // NewCRLFWriter implements a CR/LF line ending writer used for normalizing
    29  // text for Windows platforms.
    30  func NewCRLFWriter(w io.Writer) io.Writer {
    31  	return crlfWriter{w}
    32  }
    33  
    34  func (w crlfWriter) Write(b []byte) (n int, err error) {
    35  	for i, written := 0, 0; ; {
    36  		next := bytes.Index(b[i:], []byte("\n"))
    37  		if next == -1 {
    38  			n, err := w.Writer.Write(b[i:])
    39  			return written + n, err
    40  		}
    41  		next = next + i
    42  		n, err := w.Writer.Write(b[i:next])
    43  		if err != nil {
    44  			return written + n, err
    45  		}
    46  		written += n
    47  		n, err = w.Writer.Write([]byte("\r\n"))
    48  		if err != nil {
    49  			if n > 1 {
    50  				n = 1
    51  			}
    52  			return written + n, err
    53  		}
    54  		written++
    55  		i = next + 1
    56  	}
    57  }
    58
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