The clear and wclear routines are like erase and werase , but they also call clearok , so that the screen is cleared completely on the next call to wrefresh for that window and repainted from scratch. The clrtobot and wclrtobot routines erase from the cursor to the end of screen. That is, they erase all lines below the cursor in the window. Also, the current line to the right of the cursor, inclusive, is erased. The clrtoeol and wclrtoeol routines erase the current line to the right of the cursor, inclusive, to the end of the current line.
All routines return the integer OK .
These functions are described in the XSI Curses standard, Issue 4. The standard specifies that they return ERR on failure, but specifies no error conditions. This will not work under ncurses.