erase, werase, clear, wclear, clrtobot, wclrtobot, clr-
toeol, wclrtoeol - clear all or part of a curses window
# include <curses.h>
int werase(WINDOW *win);
int wclear(WINDOW *win);
int wclrtobot(WINDOW *win);
int wclrtoeol(WINDOW *win);
The erase and werase routines copy blanks to every position
in the window, clearing the screen.
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
Blanks created by erasure have the current background rendition
(as set by wbkgdset) merged into them.
All routines return the integer OK. The SVr4.0 manual
says "or a non-negative integer if immedok is set", but
this appears to be an error.
Note that erase, werase, clear, wclear, clrtobot, and clr-
toeol may be macros.
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.
Some historic curses implementations had, as an undocumented
feature, the ability to do the equivalent of
clearok(..., 1) by saying touchwin(stdscr) or
clear(stdscr). This will not work under ncurses.
curses(3), curs_outopts(3), curs_refresh(3)
[ Back ]