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126 lines
3.3 KiB
Go
126 lines
3.3 KiB
Go
// +build windows
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// +build !appengine
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package isatty
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import (
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"errors"
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"strings"
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"syscall"
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"unicode/utf16"
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"unsafe"
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)
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const (
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objectNameInfo uintptr = 1
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fileNameInfo = 2
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fileTypePipe = 3
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)
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var (
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kernel32 = syscall.NewLazyDLL("kernel32.dll")
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ntdll = syscall.NewLazyDLL("ntdll.dll")
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procGetConsoleMode = kernel32.NewProc("GetConsoleMode")
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procGetFileInformationByHandleEx = kernel32.NewProc("GetFileInformationByHandleEx")
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procGetFileType = kernel32.NewProc("GetFileType")
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procNtQueryObject = ntdll.NewProc("NtQueryObject")
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)
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func init() {
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// Check if GetFileInformationByHandleEx is available.
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if procGetFileInformationByHandleEx.Find() != nil {
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procGetFileInformationByHandleEx = nil
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}
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}
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// IsTerminal return true if the file descriptor is terminal.
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func IsTerminal(fd uintptr) bool {
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var st uint32
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r, _, e := syscall.Syscall(procGetConsoleMode.Addr(), 2, fd, uintptr(unsafe.Pointer(&st)), 0)
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return r != 0 && e == 0
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}
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// Check pipe name is used for cygwin/msys2 pty.
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// Cygwin/MSYS2 PTY has a name like:
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// \{cygwin,msys}-XXXXXXXXXXXXXXXX-ptyN-{from,to}-master
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func isCygwinPipeName(name string) bool {
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token := strings.Split(name, "-")
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if len(token) < 5 {
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return false
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}
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if token[0] != `\msys` &&
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token[0] != `\cygwin` &&
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token[0] != `\Device\NamedPipe\msys` &&
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token[0] != `\Device\NamedPipe\cygwin` {
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return false
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}
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if token[1] == "" {
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return false
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}
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if !strings.HasPrefix(token[2], "pty") {
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return false
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}
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if token[3] != `from` && token[3] != `to` {
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return false
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}
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if token[4] != "master" {
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return false
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}
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return true
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}
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// getFileNameByHandle use the undocomented ntdll NtQueryObject to get file full name from file handler
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// since GetFileInformationByHandleEx is not avilable under windows Vista and still some old fashion
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// guys are using Windows XP, this is a workaround for those guys, it will also work on system from
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// Windows vista to 10
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// see https://stackoverflow.com/a/18792477 for details
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func getFileNameByHandle(fd uintptr) (string, error) {
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if procNtQueryObject == nil {
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return "", errors.New("ntdll.dll: NtQueryObject not supported")
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}
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var buf [4 + syscall.MAX_PATH]uint16
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var result int
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r, _, e := syscall.Syscall6(procNtQueryObject.Addr(), 5,
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fd, objectNameInfo, uintptr(unsafe.Pointer(&buf)), uintptr(2*len(buf)), uintptr(unsafe.Pointer(&result)), 0)
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if r != 0 {
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return "", e
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}
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return string(utf16.Decode(buf[4 : 4+buf[0]/2])), nil
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}
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// IsCygwinTerminal() return true if the file descriptor is a cygwin or msys2
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// terminal.
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func IsCygwinTerminal(fd uintptr) bool {
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if procGetFileInformationByHandleEx == nil {
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name, err := getFileNameByHandle(fd)
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if err != nil {
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return false
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}
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return isCygwinPipeName(name)
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}
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// Cygwin/msys's pty is a pipe.
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ft, _, e := syscall.Syscall(procGetFileType.Addr(), 1, fd, 0, 0)
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if ft != fileTypePipe || e != 0 {
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return false
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}
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var buf [2 + syscall.MAX_PATH]uint16
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r, _, e := syscall.Syscall6(procGetFileInformationByHandleEx.Addr(),
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4, fd, fileNameInfo, uintptr(unsafe.Pointer(&buf)),
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uintptr(len(buf)*2), 0, 0)
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if r == 0 || e != 0 {
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return false
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}
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l := *(*uint32)(unsafe.Pointer(&buf))
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return isCygwinPipeName(string(utf16.Decode(buf[2 : 2+l/2])))
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}
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