X-Git-Url: https://ncurses.scripts.mit.edu/?p=ncurses.git;a=blobdiff_plain;f=man%2Fcurs_addch.3x;h=68667d9f630e037a866c2ea095361c53232de562;hp=ee980aac54351729d7ef80b2744d6b7d6987d147;hb=e5d1530ca229aef94a3c84ad33f8ae89f35c4045;hpb=d97989d1e0db7282c723cabb44b991b951790006

diff --git a/man/curs_addch.3x b/man/curs_addch.3x
index ee980aac..68667d9f 100644
--- a/man/curs_addch.3x
+++ b/man/curs_addch.3x
@@ -1,6 +1,7 @@
 '\" t
 .\"***************************************************************************
-.\" Copyright (c) 1998-2018,2019 Free Software Foundation, Inc.              *
+.\" Copyright 2018-2019,2020 Thomas E. Dickey                                *
+.\" Copyright 1998-2015,2017 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            *
@@ -27,7 +28,7 @@
 .\" authorization.                                                           *
 .\"***************************************************************************
 .\"
-.\" $Id: curs_addch.3x,v 1.50 2019/11/30 20:07:00 tom Exp $
+.\" $Id: curs_addch.3x,v 1.54 2020/10/17 23:02:40 tom Exp $
 .TH curs_addch 3X ""
 .ie \n(.g .ds `` \(lq
 .el       .ds `` ``
@@ -54,7 +55,7 @@
 \fBint mvaddch(int y, int x, const chtype ch);\fR
 .br
 \fBint mvwaddch(WINDOW *win, int y, int x, const chtype ch);\fR
-.br
+.sp
 \fBint echochar(const chtype ch);\fR
 .br
 \fBint wechochar(WINDOW *win, const chtype ch);\fR
@@ -93,11 +94,12 @@ scrolling the window if on the last line.
 Tabs are considered to be at every eighth column.
 The tab interval may be altered by setting the \fBTABSIZE\fR variable.
 .PP
-If \fIch\fR is any other control character, it
-is drawn in \fB^\fR\fIX\fR notation.
+If \fIch\fR is any other nonprintable character,
+it is drawn in printable form,
+i.e., the \fB^\fR\fIX\fR notation used by \fBunctrl\fR(3X).
 Calling \fBwinch\fR after adding a
-control character does not return the character itself, but instead returns
-the ^-representation of the control character.
+nonprintable character does not return the character itself,
+but instead returns the printable representation of the character.
 .PP
 Video attributes can be combined with a character argument passed to
 \fBaddch\fR or related functions by logical-ORing them into the character.
@@ -174,6 +176,19 @@ unless otherwise noted in the preceding routine descriptions.
 Functions with a \*(``mv\*('' prefix first perform a cursor movement using
 \fBwmove\fP, and return an error if the position is outside the window,
 or if the window pointer is null.
+.PP
+If it is not possible to add a complete character,
+an error is returned:
+.bP
+If \fBscrollok\fR is not enabled,
+writing a character at the lower right margin succeeds.
+However, an error is returned because
+it is not possible to wrap to a new line
+.bP
+If an error is detected when converting a multibyte character to a sequence
+of bytes,
+or if it is not possible to add all of the resulting bytes in the window,
+an error is returned.
 .SH NOTES
 Note that \fBaddch\fR, \fBmvaddch\fR, \fBmvwaddch\fR, and
 \fBechochar\fR may be macros.