38 lines
1.1 KiB
Go
38 lines
1.1 KiB
Go
package diff
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import (
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"bufio"
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"io"
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)
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// readLine is a helper that mimics the functionality of calling bufio.Scanner.Scan() and
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// bufio.Scanner.Bytes(), but without the token size limitation. It will read and return
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// the next line in the Reader with the trailing newline stripped. It will return an
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// io.EOF error when there is nothing left to read (at the start of the function call). It
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// will return any other errors it receives from the underlying call to ReadBytes.
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func readLine(r *bufio.Reader) ([]byte, error) {
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line_, err := r.ReadBytes('\n')
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if err == io.EOF {
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if len(line_) == 0 {
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return nil, io.EOF
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}
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// ReadBytes returned io.EOF, because it didn't find another newline, but there is
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// still the remainder of the file to return as a line.
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line := line_
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return line, nil
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} else if err != nil {
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return nil, err
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}
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line := line_[0 : len(line_)-1]
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return dropCR(line), nil
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}
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// dropCR drops a terminal \r from the data.
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func dropCR(data []byte) []byte {
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if len(data) > 0 && data[len(data)-1] == '\r' {
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return data[0 : len(data)-1]
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}
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return data
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}
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