dntk 2.1.6

Command line's multi-platform interactive calculator, GNU bc wrapper.
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#[cfg(windows)]
fn enable_ansi_support() -> Result<(), u32> {
    use winapi::um::processenv::GetStdHandle;
    use winapi::um::errhandlingapi::GetLastError;
    use winapi::um::consoleapi::{GetConsoleMode, SetConsoleMode};
    use winapi::um::handleapi::INVALID_HANDLE_VALUE;

    const STD_OUT_HANDLE: u32 = -11i32 as u32;
    const ENABLE_VIRTUAL_TERMINAL_PROCESSING: u32 = 0x0004;

    unsafe {
        // https://docs.microsoft.com/en-us/windows/console/getstdhandle
        let std_out_handle = GetStdHandle(STD_OUT_HANDLE);
        if std_out_handle == INVALID_HANDLE_VALUE
        {
            return Err(GetLastError()); 
        }
 
        // https://docs.microsoft.com/en-us/windows/console/getconsolemode
        let mut console_mode: u32 = 0;
        if 0 == GetConsoleMode(std_out_handle, &mut console_mode)
        {
            return Err(GetLastError());
        }

        // VT processing not already enabled?
        if console_mode & ENABLE_VIRTUAL_TERMINAL_PROCESSING == 0 {
            // https://docs.microsoft.com/en-us/windows/console/setconsolemode
            if 0 == SetConsoleMode(std_out_handle, console_mode | ENABLE_VIRTUAL_TERMINAL_PROCESSING)
            {
                return Err(GetLastError()); 
            }
        }
    }

    return Ok(());
}