49 lines
1.1 KiB
Go
49 lines
1.1 KiB
Go
// +build windows
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package password
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import (
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"os"
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"syscall"
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)
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var (
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kernel32 = syscall.MustLoadDLL("kernel32.dll")
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setConsoleModeProc = kernel32.MustFindProc("SetConsoleMode")
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)
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// Magic constant from MSDN to control whether charactesr read are
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// repeated back on the console.
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//
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// http://msdn.microsoft.com/en-us/library/windows/desktop/ms686033(v=vs.85).aspx
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const ENABLE_ECHO_INPUT = 0x0004
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func read(f *os.File) (string, error) {
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handle := syscall.Handle(f.Fd())
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// Grab the old console mode so we can reset it. We defer the reset
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// right away because it doesn't matter (it is idempotent).
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var oldMode uint32
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if err := syscall.GetConsoleMode(handle, &oldMode); err != nil {
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return "", err
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}
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defer setConsoleMode(handle, oldMode)
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// The new mode is the old mode WITHOUT the echo input flag set.
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var newMode uint32 = uint32(int(oldMode) & ^ENABLE_ECHO_INPUT)
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if err := setConsoleMode(handle, newMode); err != nil {
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return "", err
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}
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return readline(f)
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}
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func setConsoleMode(console syscall.Handle, mode uint32) error {
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r, _, err := setConsoleModeProc.Call(uintptr(console), uintptr(mode))
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if r == 0 {
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return err
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}
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return nil
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}
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