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* @Id: curs_clear.3x,v 1.7 1998/03/11 21:12:53 juergen Exp @
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< H1 > curs_clear 3x< / H1 >
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< STRONG > < A HREF = "curs_clear.3x.html" > curs_clear(3x)< / A > < / STRONG > < STRONG > < A HREF = "curs_clear.3x.html" > curs_clear(3x)< / A > < / STRONG >
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< / PRE >
< H2 > NAME< / H2 > < PRE >
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< STRONG > erase< / STRONG > , < STRONG > werase< / STRONG > , < STRONG > clear< / STRONG > , < STRONG > wclear< / STRONG > , < STRONG > clrtobot< / STRONG > , < STRONG > wclrtobot< / STRONG > , < STRONG > clr-< / STRONG >
< STRONG > toeol< / STRONG > , < STRONG > wclrtoeol< / STRONG > - clear all or part of a < STRONG > curses< / STRONG > window
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< / PRE >
< H2 > SYNOPSIS< / H2 > < PRE >
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< STRONG > #< / STRONG > < STRONG > include< / STRONG > < STRONG > < curses.h> < / STRONG >
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< STRONG > int< / STRONG > < STRONG > erase(void);< / STRONG >
< STRONG > int< / STRONG > < STRONG > werase(WINDOW< / STRONG > < STRONG > *win);< / STRONG >
< STRONG > int< / STRONG > < STRONG > clear(void);< / STRONG >
< STRONG > int< / STRONG > < STRONG > wclear(WINDOW< / STRONG > < STRONG > *win);< / STRONG >
< STRONG > int< / STRONG > < STRONG > clrtobot(void);< / STRONG >
< STRONG > int< / STRONG > < STRONG > wclrtobot(WINDOW< / STRONG > < STRONG > *win);< / STRONG >
< STRONG > int< / STRONG > < STRONG > clrtoeol(void);< / STRONG >
< STRONG > int< / STRONG > < STRONG > wclrtoeol(WINDOW< / STRONG > < STRONG > *win);< / STRONG >
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< / PRE >
< H2 > DESCRIPTION< / H2 > < PRE >
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The < STRONG > erase< / STRONG > and < STRONG > werase< / STRONG > routines copy blanks to every posi-
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tion in the window, clearing the screen.
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The < STRONG > clear< / STRONG > and < STRONG > wclear< / STRONG > routines are like < STRONG > erase< / STRONG > and < STRONG > werase< / STRONG > ,
but they also call < STRONG > clearok< / STRONG > , so that the screen is cleared
completely on the next call to < STRONG > wrefresh< / STRONG > for that window
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and repainted from scratch.
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The < STRONG > clrtobot< / STRONG > and < STRONG > wclrtobot< / STRONG > routines erase from the cursor
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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.
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The < STRONG > clrtoeol< / STRONG > and < STRONG > wclrtoeol< / STRONG > routines erase the current line
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to the right of the cursor, inclusive, to the end of the
current line.
Blanks created by erasure have the current background ren-
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dition (as set by < STRONG > wbkgdset< / STRONG > ) merged into them.
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< / PRE >
< H2 > RETURN VALUE< / H2 > < PRE >
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All routines return the integer < STRONG > OK< / STRONG > . The SVr4.0 manual
says "or a non-negative integer if < STRONG > immedok< / STRONG > is set", but
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this appears to be an error.
< / PRE >
< H2 > NOTES< / H2 > < PRE >
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Note that < STRONG > erase< / STRONG > , < STRONG > werase< / STRONG > , < STRONG > clear< / STRONG > , < STRONG > wclear< / STRONG > , < STRONG > clrtobot< / STRONG > , and < STRONG > clr-< / STRONG >
< STRONG > toeol< / STRONG > may be macros.
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< / PRE >
< H2 > PORTABILITY< / H2 > < PRE >
These functions are described in the XSI Curses standard,
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Issue 4. The standard specifies that they return < STRONG > ERR< / STRONG > on
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failure, but specifies no error conditions.
Some historic curses implementations had, as an undocu-
mented feature, the ability to do the equivalent of
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< STRONG > clearok(...,< / STRONG > < STRONG > 1)< / STRONG > by saying < STRONG > touchwin(stdscr)< / STRONG > or < STRONG > clear(std-< / STRONG >
< STRONG > scr)< / STRONG > . This will not work under ncurses.
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< / PRE >
< H2 > SEE ALSO< / H2 > < PRE >
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< STRONG > < A HREF = "ncurses.3x.html" > curses(3x)< / A > < / STRONG > , < STRONG > < A HREF = "curs_outopts.3x.html" > curs_outopts(3x)< / A > < / STRONG > , < STRONG > < A HREF = "curs_refresh.3x.html" > curs_refresh(3x)< / A > < / STRONG >
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< STRONG > < A HREF = "curs_clear.3x.html" > curs_clear(3x)< / A > < / STRONG >
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