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os: clarify windows read console code
R=golang-dev, r CC=golang-dev https://golang.org/cl/9458043
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@ -253,12 +253,12 @@ func (f *File) readConsole(b []byte) (n int, err error) {
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if len(f.readbuf) == 0 {
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// syscall.ReadConsole seems to fail, if given large buffer.
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// So limit the buffer to 16000 characters.
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readN := 16000
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if len(b) < readN {
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readN = len(b)
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numBytes := len(b)
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if numBytes > 16000 {
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numBytes = 16000
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}
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// get more input data from os
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wchars := make([]uint16, readN)
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wchars := make([]uint16, numBytes)
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var p *uint16
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if len(b) > 0 {
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p = &wchars[0]
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