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The following family of functions clear all or part of a window.
When clearing a window, the blanks created by erasure have the current
background rendition (as set by bkgdset!) merged into them.
The erase routine copies blanks to every
position in the window, clearing the screen.
It returns #f on failure and #t on success.
The clear routine is like erase, but they also call
clearok!, so that the screen is cleared completely on the next
call to refresh for that window and repainted from scratch.
Its return value is unspecified.
The clrtobot routine 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.
Its return value is unspecified.
The clrtoeol routine erase the current line to the right
of the cursor, inclusive, to the end of the current line.
It returns #f on failure and #t on success. Failure
could occur if the cursor position is offscreen.