ncurses 6.2 - patch 20201017

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

diff --git a/man/curs_clear.3x b/man/curs_clear.3x
index 8668feb8225d7e068444e5425ffc14f9585c51e7..9d2872a3dd57f4bef15d313431c9f5b6ef59841d 100644 (file)
--- a/man/curs_clear.3x
+++ b/man/curs_clear.3x
@@ -1,5 +1,6 @@
 .\"***************************************************************************
 .\"***************************************************************************

-.\" Copyright (c) 1998-2016,2018 Free Software Foundation, Inc.              *
+.\" Copyright 2018,2020 Thomas E. Dickey                                     *
+.\" Copyright 1998-2010,2016 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            *
 .\"                                                                          *
 .\" Permission is hereby granted, free of charge, to any person obtaining a  *
 .\" copy of this software and associated documentation files (the            *


@@ -26,10 +27,14 @@
 .\" authorization.                                                           *
 .\"***************************************************************************
 .\"
 .\" authorization.                                                           *
 .\"***************************************************************************
 .\"

-.\" $Id: curs_clear.3x,v 1.16 2018/07/28 21:34:06 tom Exp $
+.\" $Id: curs_clear.3x,v 1.19 2020/10/03 21:43:37 tom Exp $

 .TH curs_clear 3X ""
 .na
 .hy 0
 .TH curs_clear 3X ""
 .na
 .hy 0

+.de bP
+.ie n  .IP \(bu 4
+.el    .IP \(bu 2
+..

 .SH NAME
 \fBerase\fR,
 \fBwerase\fR,
 .SH NAME
 \fBerase\fR,
 \fBwerase\fR,


@@ -42,20 +47,20 @@
 .ad
 .hy
 .SH SYNOPSIS
 .ad
 .hy
 .SH SYNOPSIS

-\fB# include <curses.h>\fR
+\fB#include <curses.h>\fR

 .sp
 \fBint erase(void);\fR
 .br
 \fBint werase(WINDOW *win);\fR
 .sp
 \fBint erase(void);\fR
 .br
 \fBint werase(WINDOW *win);\fR

-.br
+.sp

 \fBint clear(void);\fR
 .br
 \fBint wclear(WINDOW *win);\fR
 \fBint clear(void);\fR
 .br
 \fBint wclear(WINDOW *win);\fR

-.br
+.sp

 \fBint clrtobot(void);\fR
 .br
 \fBint wclrtobot(WINDOW *win);\fR
 \fBint clrtobot(void);\fR
 .br
 \fBint wclrtobot(WINDOW *win);\fR

-.br
+.sp

 \fBint clrtoeol(void);\fR
 .br
 \fBint wclrtoeol(WINDOW *win);\fR
 \fBint clrtoeol(void);\fR
 .br
 \fBint wclrtoeol(WINDOW *win);\fR


@@ -81,12 +86,14 @@ Blanks created by erasure have the current background rendition (as set
 by \fBwbkgdset\fR) merged into them.
 .SH RETURN VALUE
 All routines return the integer \fBOK\fR on success and \fBERR\fP on failure.
 by \fBwbkgdset\fR) merged into them.
 .SH RETURN VALUE
 All routines return the integer \fBOK\fR on success and \fBERR\fP on failure.

-The SVr4.0 manual says "or a
-non-negative integer if \fBimmedok\fR is set", but this appears to be an error.

 .PP
 X/Open defines no error conditions.
 In this implementation,
 .PP
 X/Open defines no error conditions.
 In this implementation,

-functions using a window pointer parameter return an error if it is null.
+.bP
+functions using a window pointer parameter return an error if it is null
+.bP
+\fBwclrtoeol\fP returns an error
+if the cursor position is about to wrap.

 .SH NOTES
 Note that \fBerase\fR, \fBwerase\fR, \fBclear\fR, \fBwclear\fR,
 \fBclrtobot\fR, and \fBclrtoeol\fR may be macros.
 .SH NOTES
 Note that \fBerase\fR, \fBwerase\fR, \fBclear\fR, \fBwclear\fR,
 \fBclrtobot\fR, and \fBclrtoeol\fR may be macros.


@@ -96,6 +103,12 @@ The
 standard specifies that they return \fBERR\fR on failure, but specifies no
 error conditions.
 .PP
 standard specifies that they return \fBERR\fR on failure, but specifies no
 error conditions.
 .PP

+The SVr4.0 manual says that these functions could
+return "a non-negative integer if \fBimmedok\fR is set",
+referring to the return-value of \fBwrefresh\fP.
+In that implementation, \fBwrefresh\fP would return a count of
+the number of characters written to the terminal.
+.PP

 Some historic curses implementations had, as an undocumented feature, the
 ability to do the equivalent of \fBclearok(..., 1)\fR by saying
 \fBtouchwin(stdscr)\fR or \fBclear(stdscr)\fR.
 Some historic curses implementations had, as an undocumented feature, the
 ability to do the equivalent of \fBclearok(..., 1)\fR by saying
 \fBtouchwin(stdscr)\fR or \fBclear(stdscr)\fR.