+.\"***************************************************************************
+.\" Copyright (c) 1998,2000,2001 Free Software Foundation, Inc. *
+.\" *
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+.\" copies of the Software, and to permit persons to whom the Software is *
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+.\"***************************************************************************
+.\"
+.\" $Id: curs_scroll.3x,v 1.9 2001/10/14 00:51:56 tom Exp $
.TH curs_scroll 3X ""
.SH NAME
-\fBscroll\fR, \fBsrcl\fR, \fBwscrl\fR - scroll a \fBcurses\fR window
+\fBscroll\fR, \fBscrl\fR, \fBwscrl\fR - scroll a \fBcurses\fR window
.SH SYNOPSIS
\fB#include <curses.h>\fR
\fBint wscrl(WINDOW *win, int n);\fR
.br
.SH DESCRIPTION
-The \fBscroll\fR routine scrolls the window up one line. This involves moving
-the lines in the window data structure. As an optimization, if the scrolling
+The \fBscroll\fR 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 \fIn\fR, the \fBscrl\fR and \fBwscrl\fR routines scroll the
window up \fIn\fR lines (line \fIi\fR+\fIn\fR becomes \fIi\fR); otherwise
-scroll the window down \fIn\fR lines. This involves moving the lines in the
-window character image structure. The current cursor position is not changed.
+scroll the window down \fIn\fR 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 \fBscrollok\fR.
.SH RETURN VALUE
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 deliberately does not guarantee
-that this will occur, in order to leave open the possibility of smarter
+"may be" performed.
+This implementation deliberately does not guarantee
+that this will occur, to leave open the possibility of smarter
optimization of multiple scroll actions on the next update.
-Neither the SVr4 documentation specifies whether the current attribute or
+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.
.SH PORTABILITY
projects / ncurses.git / blobdiff