Deactivate the video display attribute attr within the window.
    The clrattr function acts on the stdscr window.

    Format

      #include  <curses.h>

      int clrattr  (int attr);

      int wclrattr  (WINDOW *win, int attr);

1  –  Arguments

 win

    A pointer to the window.

 attr

    Video display attributes that can be blinking, boldface, reverse
    video, and underlining; they are represented by the defined
    constants _BLINK, _BOLD, _REVERSE, and _UNDERLINE. To clear
    multiple attributes, separate them with a bitwise OR operator
    (|) as follows:

    clrattr(_BLINK | _UNDERLINE);

2  –  Description

    These functions are specific to VSI C for OpenVMS Systems and
    are not portable.

3  –  Return Values

    OK                 Indicates success.
    ERR                Indicates an error.