curs_scroll(3x) — Linux manual page
curs_scroll(3X) curs_scroll(3X)
NAME
scroll, scrl, 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 optimiza‐
tion, 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 cursor position is not changed.
For these functions to work, scrolling must be enabled via scrol‐
lok(3X).
RETURN VALUE
These routines return ERR upon failure, and OK (SVr4 only speci‐
fies "an integer value other than ERR") upon successful comple‐
tion.
X/Open defines no error conditions.
This implementation returns an error if the window pointer is
null, or if scrolling is not enabled in the window, e.g., with
scrollok(3X).
NOTES
Note that scrl and scroll may be macros.
The SVr4 documentation says that the optimization of physically
scrolling immediately if the scroll region is the entire screen
“is” performed, not “may be” performed. This implementation de‐
liberately does not guarantee that this will occur, to leave open
the possibility of smarter optimization of multiple scroll ac‐
tions on the next update.
Neither the SVr4 nor the XSI documentation specify whether the
current attribute or current color-pair of blanks generated by
the scroll function is zeroed. Under this implementation it is.
PORTABILITY
The XSI Curses standard, Issue 4 describes these functions.
SEE ALSO
curses(3X), curs_outopts(3X)
COLOPHON
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