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Commented on client custom io.Copy and copyBuffer

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Signed-off-by: Russ Magee <rmagee@gmail.com>
This commit is contained in:
Russ Magee 2018-12-08 21:53:35 -08:00
parent a0e90c14ba
commit 3dab963bc9
1 changed files with 9 additions and 0 deletions
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9
hkexsh/hkexsh.go
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@ -86,6 +86,11 @@ type (
// the copy is implemented by calling src.WriteTo(dst). // the copy is implemented by calling src.WriteTo(dst).
// Otherwise, if dst implements the ReaderFrom interface, // Otherwise, if dst implements the ReaderFrom interface,
// the copy is implemented by calling dst.ReadFrom(src). // the copy is implemented by calling dst.ReadFrom(src).
//
// This is identical to stdlib pkg/io.Copy save that it
// calls a client-custom version of copyBuffer(), which allows
// some client escape sequences to trigger special actions during
// interactive sessions.
func Copy(dst io.Writer, src io.Reader) (written int64, err error) { func Copy(dst io.Writer, src io.Reader) (written int64, err error) {
written, err = copyBuffer(dst, src, nil) written, err = copyBuffer(dst, src, nil)
return return
@ -93,6 +98,10 @@ func Copy(dst io.Writer, src io.Reader) (written int64, err error) {
// copyBuffer is the actual implementation of Copy and CopyBuffer. // copyBuffer is the actual implementation of Copy and CopyBuffer.
// if buf is nil, one is allocated. // if buf is nil, one is allocated.
//
// This private version of copyBuffer is derived from the
// go stdlib pkg/io, with escape sequence interpretation to trigger
// some special client-side actions.
func copyBuffer(dst io.Writer, src io.Reader, buf []byte) (written int64, err error) { func copyBuffer(dst io.Writer, src io.Reader, buf []byte) (written int64, err error) {
// NOTE: using dst.Write() in these esc funcs will cause the output // NOTE: using dst.Write() in these esc funcs will cause the output
// to function as a 'macro', outputting as if user typed the sequence. // to function as a 'macro', outputting as if user typed the sequence.