87 lines
2.1 KiB
Go
87 lines
2.1 KiB
Go
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// +build windows
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package common
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import (
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"syscall"
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"unsafe"
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)
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// windows constants and structures pulled from msdn
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const (
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_STD_INPUT_HANDLE = -10
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_STD_OUTPUT_HANDLE = -11
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_STD_ERROR_HANDLE = -12
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)
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type (
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_SHORT int16
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_WORD uint16
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_SMALL_RECT struct {
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Left, Top, Right, Bottom _SHORT
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}
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_COORD struct {
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X, Y _SHORT
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}
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_CONSOLE_SCREEN_BUFFER_INFO struct {
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dwSize, 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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)
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// Low-level functions that call into Windows API for getting console info
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var kernel32 = syscall.NewLazyDLL("kernel32.dll")
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var kernel32_GetStdHandleProc = kernel32.NewProc("GetStdHandle")
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var kernel32_GetConsoleScreenBufferInfoProc = kernel32.NewProc("GetConsoleScreenBufferInfo")
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func kernel32_GetStdHandle(nStdHandle int32) (syscall.Handle, error) {
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res, _, err := kernel32_GetStdHandleProc.Call(uintptr(nStdHandle))
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if res == uintptr(syscall.InvalidHandle) {
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return syscall.InvalidHandle, error(err)
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}
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return syscall.Handle(res), nil
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}
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func kernel32_GetConsoleScreenBufferInfo(hConsoleOutput syscall.Handle, info *_CONSOLE_SCREEN_BUFFER_INFO) error {
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ok, _, err := kernel32_GetConsoleScreenBufferInfoProc.Call(uintptr(hConsoleOutput), uintptr(unsafe.Pointer(info)))
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if int(ok) == 0 {
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return error(err)
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}
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return nil
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}
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// windows api to get the console screen buffer info
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func getConsoleScreenBufferInfo(csbi *_CONSOLE_SCREEN_BUFFER_INFO) (err error) {
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var (
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bi _CONSOLE_SCREEN_BUFFER_INFO
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fd syscall.Handle
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)
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// Re-open CONOUT$ as in some instances, stdout may be closed and guaranteed an stdout
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if fd, err = syscall.Open("CONOUT$", syscall.O_RDWR, 0); err != nil {
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return err
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}
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defer syscall.Close(fd)
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// grab the dimensions for the console
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if err = kernel32_GetConsoleScreenBufferInfo(fd, &bi); err != nil {
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return err
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}
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*csbi = bi
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return nil
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}
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func platformGetTerminalDimensions() (width, height int, err error) {
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var csbi _CONSOLE_SCREEN_BUFFER_INFO
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if err = getConsoleScreenBufferInfo(&csbi); err != nil {
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return 0, 0, err
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}
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return int(csbi.dwSize.X), int(csbi.dwSize.Y), nil
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}
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