curs_scroll(3)curs_scroll(3)NAME
scroll, srcl, wscrl - scroll a curses window
SYNOPSIS
#include <curses.h>
int scroll(WINDOW *win);
int scrl(int n);
int wscrl(WINDOW *win, int n);
DESCRIPTION
The scroll routine scrolls the window up one line. This
involves moving the lines in the window data structure.
As an optimization, if the scrolling region of the window
is the entire screen, the physical screen may be scrolled
at the same time.
For positive n, the scrl and wscrl routines scroll the
window up n lines (line i+n becomes i); otherwise scroll
the window down n lines. This involves moving the lines
in the window character image structure. The current cur-
sor position is not changed.
For these functions to work, scrolling must be enabled via
scrollok.
RETURN VALUE
These routines return ERR upon failure, and OK (SVr4 only
specifies "an integer value other than ERR") upon success-
ful completion.
NOTES
Note that scrl and scroll may be macros.
The SVr4 documentation says that the optimization of phys-
ically scrolling immediately if the scroll region is the
entire screen "is" performed, not "may be" performed.
This implementation deliberately does not guarantee that
this will occur, in order to leave open the possibility of
smarter optimization of multiple scroll actions on the
next update.
Neither the SVr4 documentation specifies whether the cur-
rent attribute or current color-pair of blanks generated
by the scroll function is zeroed. Under this implementa-
tion it is.
PORTABILITY
The XSI Curses standard, Issue 4 describes these func-
tions.
SEE ALSOcurses(3), curs_outopts(3X)
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