term_windows.go

Documentation: golang.org/x/term

     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  	raw |= windows.ENABLE_VIRTUAL_TERMINAL_INPUT
    30  	if err := windows.SetConsoleMode(windows.Handle(fd), raw); err != nil {
    31  		return nil, err
    32  	}
    33  	return &State{state{st}}, nil
    34  }
    35  
    36  func getState(fd int) (*State, error) {
    37  	var st uint32
    38  	if err := windows.GetConsoleMode(windows.Handle(fd), &st); err != nil {
    39  		return nil, err
    40  	}
    41  	return &State{state{st}}, nil
    42  }
    43  
    44  func restore(fd int, state *State) error {
    45  	return windows.SetConsoleMode(windows.Handle(fd), state.mode)
    46  }
    47  
    48  func getSize(fd int) (width, height int, err error) {
    49  	var info windows.ConsoleScreenBufferInfo
    50  	if err := windows.GetConsoleScreenBufferInfo(windows.Handle(fd), &info); err != nil {
    51  		return 0, 0, err
    52  	}
    53  	return int(info.Window.Right - info.Window.Left + 1), int(info.Window.Bottom - info.Window.Top + 1), nil
    54  }
    55  
    56  func readPassword(fd int) ([]byte, error) {
    57  	var st uint32
    58  	if err := windows.GetConsoleMode(windows.Handle(fd), &st); err != nil {
    59  		return nil, err
    60  	}
    61  	old := st
    62  
    63  	st &^= (windows.ENABLE_ECHO_INPUT | windows.ENABLE_LINE_INPUT)
    64  	st |= (windows.ENABLE_PROCESSED_OUTPUT | windows.ENABLE_PROCESSED_INPUT)
    65  	if err := windows.SetConsoleMode(windows.Handle(fd), st); err != nil {
    66  		return nil, err
    67  	}
    68  
    69  	defer windows.SetConsoleMode(windows.Handle(fd), old)
    70  
    71  	var h windows.Handle
    72  	p, _ := windows.GetCurrentProcess()
    73  	if err := windows.DuplicateHandle(p, windows.Handle(fd), p, &h, 0, false, windows.DUPLICATE_SAME_ACCESS); err != nil {
    74  		return nil, err
    75  	}
    76  
    77  	f := os.NewFile(uintptr(h), "stdin")
    78  	defer f.Close()
    79  	return readPasswordLine(f)
    80  }
    81
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