term_windows.go

     1  // Copyright 2019 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package term
     6  
     7  import (
     8  	"os"
     9  
    10  	"golang.org/x/sys/windows"
    11  )
    12  
    13  type state struct {
    14  	mode uint32
    15  }
    16  
    17  func isTerminal(fd int) bool {
    18  	var st uint32
    19  	err := windows.GetConsoleMode(windows.Handle(fd), &st)
    20  	return err == nil
    21  }
    22  
    23  func makeRaw(fd int) (*State, error) {
    24  	var st uint32
    25  	if err := windows.GetConsoleMode(windows.Handle(fd), &st); err != nil {
    26  		return nil, err
    27  	}
    28  	raw := st &^ (windows.ENABLE_ECHO_INPUT | windows.ENABLE_PROCESSED_INPUT | windows.ENABLE_LINE_INPUT | windows.ENABLE_PROCESSED_OUTPUT)
    29  	if err := windows.SetConsoleMode(windows.Handle(fd), raw); err != nil {
    30  		return nil, err
    31  	}
    32  	return &State{state{st}}, nil
    33  }
    34  
    35  func getState(fd int) (*State, error) {
    36  	var st uint32
    37  	if err := windows.GetConsoleMode(windows.Handle(fd), &st); err != nil {
    38  		return nil, err
    39  	}
    40  	return &State{state{st}}, nil
    41  }
    42  
    43  func restore(fd int, state *State) error {
    44  	return windows.SetConsoleMode(windows.Handle(fd), state.mode)
    45  }
    46  
    47  func getSize(fd int) (width, height int, err error) {
    48  	var info windows.ConsoleScreenBufferInfo
    49  	if err := windows.GetConsoleScreenBufferInfo(windows.Handle(fd), &info); err != nil {
    50  		return 0, 0, err
    51  	}
    52  	return int(info.Window.Right - info.Window.Left + 1), int(info.Window.Bottom - info.Window.Top + 1), nil
    53  }
    54  
    55  func readPassword(fd int) ([]byte, error) {
    56  	var st uint32
    57  	if err := windows.GetConsoleMode(windows.Handle(fd), &st); err != nil {
    58  		return nil, err
    59  	}
    60  	old := st
    61  
    62  	st &^= (windows.ENABLE_ECHO_INPUT | windows.ENABLE_LINE_INPUT)
    63  	st |= (windows.ENABLE_PROCESSED_OUTPUT | windows.ENABLE_PROCESSED_INPUT)
    64  	if err := windows.SetConsoleMode(windows.Handle(fd), st); err != nil {
    65  		return nil, err
    66  	}
    67  
    68  	defer windows.SetConsoleMode(windows.Handle(fd), old)
    69  
    70  	var h windows.Handle
    71  	p, _ := windows.GetCurrentProcess()
    72  	if err := windows.DuplicateHandle(p, windows.Handle(fd), p, &h, 0, false, windows.DUPLICATE_SAME_ACCESS); err != nil {
    73  		return nil, err
    74  	}
    75  
    76  	f := os.NewFile(uintptr(h), "stdin")
    77  	defer f.Close()
    78  	return readPasswordLine(f)
    79  }
    80
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