mirror of https://github.com/chzyer/readline.git
122 lines
2.3 KiB
Go
122 lines
2.3 KiB
Go
// +build windows
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package readline
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import (
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"reflect"
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"syscall"
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"unsafe"
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)
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var (
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kernel = NewKernel()
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stdout = uintptr(syscall.Stdout)
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)
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type Kernel struct {
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SetConsoleCursorPosition,
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SetConsoleTextAttribute,
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GetConsoleScreenBufferInfo,
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FillConsoleOutputCharacterW,
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FillConsoleOutputAttribute,
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GetConsoleCursorInfo,
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GetStdHandle CallFunc
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}
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type short int16
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type word uint16
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type dword uint32
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type _COORD struct {
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x short
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y short
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}
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func (c *_COORD) ptr() uintptr {
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return uintptr(*(*int32)(unsafe.Pointer(c)))
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}
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type _CONSOLE_SCREEN_BUFFER_INFO struct {
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dwSize _COORD
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dwCursorPosition _COORD
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wAttributes word
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srWindow _SMALL_RECT
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dwMaximumWindowSize _COORD
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}
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type _SMALL_RECT struct {
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left short
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top short
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right short
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bottom short
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}
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type _CONSOLE_CURSOR_INFO struct {
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dwSize dword
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bVisible bool
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}
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type CallFunc func(u ...uintptr) error
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func NewKernel() *Kernel {
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k := &Kernel{}
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kernel32 := syscall.NewLazyDLL("kernel32.dll")
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v := reflect.ValueOf(k).Elem()
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t := v.Type()
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for i := 0; i < t.NumField(); i++ {
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name := t.Field(i).Name
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f := kernel32.NewProc(name)
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v.Field(i).Set(reflect.ValueOf(k.Wrap(f)))
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}
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return k
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}
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func (k *Kernel) Wrap(p *syscall.LazyProc) CallFunc {
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return func(args ...uintptr) error {
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var r0 uintptr
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var e1 syscall.Errno
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size := uintptr(len(args))
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if len(args) <= 3 {
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buf := make([]uintptr, 3)
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copy(buf, args)
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r0, _, e1 = syscall.Syscall(p.Addr(), size,
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buf[0], buf[1], buf[2])
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} else {
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buf := make([]uintptr, 6)
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copy(buf, args)
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r0, _, e1 = syscall.Syscall6(p.Addr(), size,
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buf[0], buf[1], buf[2], buf[3], buf[4], buf[5],
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)
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}
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if int(r0) == 0 {
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if e1 != 0 {
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return error(e1)
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} else {
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return syscall.EINVAL
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}
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}
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return nil
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}
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}
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func GetConsoleScreenBufferInfo() (*_CONSOLE_SCREEN_BUFFER_INFO, error) {
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t := new(_CONSOLE_SCREEN_BUFFER_INFO)
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err := kernel.GetConsoleScreenBufferInfo(
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stdout,
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uintptr(unsafe.Pointer(t)),
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)
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return t, err
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}
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func GetConsoleCursorInfo() (*_CONSOLE_CURSOR_INFO, error) {
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t := new(_CONSOLE_CURSOR_INFO)
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err := kernel.GetConsoleCursorInfo(stdout, uintptr(unsafe.Pointer(t)))
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return t, err
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}
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func SetConsoleCursorPosition(c *_COORD) error {
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return kernel.SetConsoleCursorPosition(stdout, c.ptr())
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}
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