ncurses 5.7 - patch 20101002

[ncurses.git] / man / curs_scroll.3x

diff --git a/man/curs_scroll.3x b/man/curs_scroll.3x
index 4e694c33b1f932e3b00594f02d925f71c092a3b2..962e391928dda3e81fd386ba636f88d2a277af0a 100644 (file)
--- a/man/curs_scroll.3x
+++ b/man/curs_scroll.3x
@@ -1,5 +1,5 @@
 .\"***************************************************************************
-.\" Copyright (c) 1998-2001,2003 Free Software Foundation, Inc.              *
+.\" Copyright (c) 1998-2006,2010 Free Software Foundation, Inc.              *
 .\"                                                                          *
 .\" Permission is hereby granted, free of charge, to any person obtaining a  *
 .\" copy of this software and associated documentation files (the            *
@@ -26,13 +26,19 @@
 .\" authorization.                                                           *
 .\"***************************************************************************
 .\"
-.\" $Id: curs_scroll.3x,v 1.10 2003/05/10 20:33:49 jmc Exp $
+.\" $Id: curs_scroll.3x,v 1.14 2010/07/31 16:10:55 tom Exp $
 .TH curs_scroll 3X ""
+.na
+.hy 0
 .SH NAME
-\fBscroll\fR, \fBscrl\fR, \fBwscrl\fR - scroll a \fBcurses\fR window
+\fBscroll\fR,
+\fBscrl\fR,
+\fBwscrl\fR \- scroll a \fBcurses\fR window
+.ad
+.hy
 .SH SYNOPSIS
 \fB#include <curses.h>\fR
-
+.sp
 \fBint scroll(WINDOW *win);\fR
 .br
 \fBint scrl(int n);\fR
@@ -46,28 +52,34 @@ 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.
-
+.PP
 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.
-
+.PP
 For these functions to work, scrolling must be enabled via \fBscrollok\fR.
 .SH RETURN VALUE
 These routines return \fBERR\fR upon failure, and \fBOK\fR (SVr4 only specifies
 "an integer value other than \fBERR\fR") upon successful completion.
+.PP
+X/Open defines no error conditions.
+.PP
+This implementation returns an error
+if the window pointer is null, or
+if scrolling is not enabled in the window, e.g., with \fBscrollok\fP.
 .SH NOTES
 Note that \fBscrl\fR and \fBscroll\fR may be macros.
-
+.PP
 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, to leave open the possibility of smarter
 optimization of multiple scroll actions on the next update.
-
+.PP
 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.