86 lines
1.7 KiB
Go
86 lines
1.7 KiB
Go
// +build windows
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package flags
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import (
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"syscall"
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"unsafe"
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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 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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COORD struct {
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X SHORT
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Y SHORT
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}
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CONSOLE_SCREEN_BUFFER_INFO struct {
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Size COORD
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CursorPosition COORD
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Attributes WORD
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Window SMALL_RECT
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MaximumWindowSize COORD
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}
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)
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var kernel32DLL = syscall.NewLazyDLL("kernel32.dll")
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var getConsoleScreenBufferInfoProc = kernel32DLL.NewProc("GetConsoleScreenBufferInfo")
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func getError(r1, r2 uintptr, lastErr error) error {
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// If the function fails, the return value is zero.
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if r1 == 0 {
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if lastErr != nil {
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return lastErr
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}
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return syscall.EINVAL
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}
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return nil
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}
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func getStdHandle(stdhandle int) (uintptr, error) {
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handle, err := syscall.GetStdHandle(stdhandle)
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if err != nil {
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return 0, err
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}
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return uintptr(handle), nil
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}
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// GetConsoleScreenBufferInfo retrieves information about the specified console screen buffer.
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// http://msdn.microsoft.com/en-us/library/windows/desktop/ms683171(v=vs.85).aspx
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func GetConsoleScreenBufferInfo(handle uintptr) (*CONSOLE_SCREEN_BUFFER_INFO, error) {
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var info CONSOLE_SCREEN_BUFFER_INFO
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if err := getError(getConsoleScreenBufferInfoProc.Call(handle, uintptr(unsafe.Pointer(&info)), 0)); err != nil {
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return nil, err
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}
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return &info, nil
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}
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func getTerminalColumns() int {
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defaultWidth := 80
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stdoutHandle, err := getStdHandle(syscall.STD_OUTPUT_HANDLE)
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if err != nil {
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return defaultWidth
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}
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info, err := GetConsoleScreenBufferInfo(stdoutHandle)
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if err != nil {
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return defaultWidth
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}
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if info.MaximumWindowSize.X > 0 {
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return int(info.MaximumWindowSize.X)
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}
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return defaultWidth
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}
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