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RedHat 9 (Linux i386) - man page for wclear (redhat section 3X)

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curs_clear(3X)									   curs_clear(3X)

       erase, werase, clear, wclear, clrtobot, wclrtobot, clrtoeol, wclrtoeol - clear all or part
       of a curses window

       # include <curses.h>

       int erase(void);
       int werase(WINDOW *win);
       int clear(void);
       int wclear(WINDOW *win);
       int clrtobot(void);
       int wclrtobot(WINDOW *win);
       int clrtoeol(void);
       int wclrtoeol(WINDOW *win);

       The erase and werase routines copy blanks to every position in the  window,  clearing  the

       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.

       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 clrtoeol 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(3X), curs_outopts(3X), curs_refresh(3X)

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