.\"***************************************************************************
-.\" Copyright (c) 1998-2013,2015 Free Software Foundation, Inc. *
+.\" Copyright 2018-2019,2020 Thomas E. Dickey *
+.\" Copyright 1998-2016,2017 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 *
.\" authorization. *
.\"***************************************************************************
.\"
-.\" $Id: curs_inopts.3x,v 1.20 2015/11/28 19:03:12 Benno.Schulenberg Exp $
+.\" $Id: curs_inopts.3x,v 1.33 2020/12/05 19:38:18 Benno.Schulenberg Exp $
.TH curs_inopts 3X ""
.ie \n(.g .ds `` \(lq
.el .ds `` ``
\fBintrflush\fR,
\fBkeypad\fR,
\fBmeta\fR,
+\fBnl\fR,
+\fBnonl\fR,
\fBnodelay\fR,
\fBnotimeout\fR,
\fBraw\fR,
\fBnoraw\fR,
-\fBnoqiflush\fR,
\fBqiflush\fR,
+\fBnoqiflush\fR,
\fBtimeout\fR,
\fBwtimeout\fR,
\fBtypeahead\fR \- \fBcurses\fR input options
\fBint cbreak(void);\fR
.br
\fBint nocbreak(void);\fR
-.br
+.sp
\fBint echo(void);\fR
.br
\fBint noecho(void);\fR
+.sp
+\fBint intrflush(WINDOW *\fP\fIwin\fP\fB, bool \fP\fIbf\fP\fB);\fR
.br
-\fBint halfdelay(int tenths);\fR
+\fBint keypad(WINDOW *\fP\fIwin\fP\fB, bool \fP\fIbf\fP\fB);\fR
.br
-\fBint intrflush(WINDOW *win, bool bf);\fR
+\fBint meta(WINDOW *\fP\fIwin\fP\fB, bool \fP\fIbf\fP\fB);\fR
.br
-\fBint keypad(WINDOW *win, bool bf);\fR
+\fBint nodelay(WINDOW *\fP\fIwin\fP\fB, bool \fP\fIbf\fP\fB);\fR
.br
-\fBint meta(WINDOW *win, bool bf);\fR
-.br
-\fBint nodelay(WINDOW *win, bool bf);\fR
+\fBint notimeout(WINDOW *\fP\fIwin\fP\fB, bool \fP\fIbf\fP\fB);\fR
+.sp
+\fBint nl(void);\fR
.br
+\fBint nonl(void);\fR
+.sp
\fBint raw(void);\fR
.br
\fBint noraw(void);\fR
-.br
-\fBvoid noqiflush(void);\fR
-.br
+.sp
\fBvoid qiflush(void);\fR
.br
-\fBint notimeout(WINDOW *win, bool bf);\fR
-.br
-\fBvoid timeout(int delay);\fR
+\fBvoid noqiflush(void);\fR
+.sp
+\fBint halfdelay(int \fP\fItenths\fP\fB);\fR
.br
-\fBvoid wtimeout(WINDOW *win, int delay);\fR
+\fBvoid timeout(int \fP\fIdelay\fP\fB);\fR
.br
-\fBint typeahead(int fd);\fR
+\fBvoid wtimeout(WINDOW *\fP\fIwin\fP\fB, int \fP\fIdelay\fP\fB);\fR
+.sp
+\fBint typeahead(int \fP\fIfd\fP\fB);\fR
.br
.SH DESCRIPTION
The \fBncurses\fP library provides several functions which let an application
An application must apply these to each window, if the same behavior
is needed.
.\"
-.SS cbreak
+.SS cbreak/nocbreak
Normally, the tty driver buffers typed characters until a newline or carriage
return is typed.
The \fBcbreak\fR routine disables line buffering and
.SS echo/noecho
.PP
The \fBecho\fR and \fBnoecho\fR routines control whether characters typed by
-the user are echoed by \fBgetch\fR as they are typed.
+the user are echoed by \fBgetch\fR(3X) as they are typed.
Echoing by the tty
driver is always disabled, but initially \fBgetch\fR is in echo mode, so
characters typed are echoed.
\fBcbreak\fR mode in that characters typed by the user are immediately
available to the program.
However, after blocking for \fItenths\fR tenths of
-seconds, ERR is returned if nothing has been typed.
+seconds, \fBERR\fP is returned if nothing has been typed.
The value of \fItenths\fR
must be a number between 1 and 255.
Use \fBnocbreak\fR to leave half-delay
The \fBkeypad\fR option enables the keypad of the user's terminal.
If
enabled (\fIbf\fR is \fBTRUE\fR), the user can press a function key
-(such as an arrow key) and \fBwgetch\fR returns a single value
+(such as an arrow key) and \fBwgetch\fR(3X) returns a single value
representing the function key, as in \fBKEY_LEFT\fR.
If disabled
(\fIbf\fR is \fBFALSE\fR), \fBcurses\fR does not treat function keys
itself.
If the keypad in the terminal can be turned on (made to
transmit) and off (made to work locally), turning on this option
-causes the terminal keypad to be turned on when \fBwgetch\fR is
+causes the terminal keypad to be turned on when \fBwgetch\fR(3X) is
called.
The default value for keypad is \fBFALSE\fP.
.\"
.SS meta
.PP
Initially, whether the terminal returns 7 or 8 significant bits on
-input depends on the control mode of the tty driver [see termio(7)].
+input depends on the control mode of the tty driver [see \fBtermios\fP(3)].
To force 8 bits to be returned, invoke \fBmeta\fR(\fIwin\fR,
\fBTRUE\fR); this is equivalent, under POSIX, to setting the CS8 flag
on the terminal.
\fBTRUE\fR) is called and \fBrmm\fR is sent when \fBmeta\fR(\fIwin\fR,
\fBFALSE\fR) is called.
.\"
+.SS nl/nonl
+.PP
+The \fBnl\fR and \fBnonl\fR routines control whether the underlying display
+device translates the return key into newline on input.
+.\"
.SS nodelay
.PP
The \fBnodelay\fR option causes \fBgetch\fR to be a non-blocking call.
If no input is ready, \fBgetch\fR returns \fBERR\fR.
If disabled
(\fIbf\fR is \fBFALSE\fR), \fBgetch\fR waits until a key is pressed.
+.SS notimeout
.PP
-While interpreting an input escape sequence, \fBwgetch\fR sets a timer
+When interpreting an escape sequence, \fBwgetch\fR(3X) sets a timer
while waiting for the next character.
If \fBnotimeout(\fR\fIwin\fR,
\fBTRUE\fR) is called, then \fBwgetch\fR does not set a timer.
the BREAK key depends on other bits in the tty driver that are not set by
\fBcurses\fR.
.\"
-.SS noqiflush
+.SS qiflush/noqiflush
.PP
When the \fBnoqiflush\fR routine is used, normal flush of input and
output queues associated with the \fBINTR\fR, \fBQUIT\fR and
-\fBSUSP\fR characters will not be done [see termio(7)].
+\fBSUSP\fR characters will not be done [see \fBtermios\fP(3)].
When
\fBqiflush\fR is called, the queues will be flushed when these control
characters are read.
-You may want to call \fBnoqiflush()\fR in a signal
+You may want to call \fBnoqiflush\fR in a signal
handler if you want output to continue as though the interrupt
had not occurred, after the handler exits.
.\"
by looking for typeahead periodically while updating the screen.
If input is found, and it is coming from a tty,
the current update is postponed until
-\fBrefresh\fR or \fBdoupdate\fR is called again.
+\fBrefresh\fR(3X) or \fBdoupdate\fR is called again.
This allows faster response to commands typed in advance.
Normally, the input FILE
pointer passed to \fBnewterm\fR, or \fBstdin\fR in the case that
\-1, then no typeahead checking is done.
.\"
.SH RETURN VALUE
-All routines that return an integer return \fBERR\fR upon failure and OK (SVr4
-specifies only "an integer value other than \fBERR\fR") upon successful
-completion, unless otherwise noted in the preceding routine descriptions.
+All routines that return an integer return \fBERR\fR upon failure and \fBOK\fP
+(SVr4 specifies only \*(``an integer value other than \fBERR\fR\*('')
+upon successful completion,
+unless otherwise noted in the preceding routine descriptions.
.PP
X/Open does not define any error conditions.
In this implementation,
BSD curses differed from this slightly; it
left the echo bit on at initialization, but the BSD \fBraw\fR call turned it
off as a side-effect.
-For best portability, set echo or noecho explicitly
+For best portability, set \fBecho \fPor \fBnoecho\fP explicitly
just after initialization, even if your program remains in cooked mode.
.PP
+The XSI Curses standard is ambiguous on the question of whether \fBraw\fR
+should disable the CRLF translations controlled by \fBnl\fR and \fBnonl\fR.
+BSD curses did turn off these translations; AT&T curses (at least as late as
+SVr1) did not.
+We chose to do so, on the theory that a programmer requesting
+raw input wants a clean (ideally 8-bit clean) connection that the operating
+system will not alter.
+.PP
When \fBkeypad\fP is first enabled,
ncurses loads the key-definitions for the current terminal description.
If the terminal description includes extended string capabilities,
-e.g., from using the \fB\-x\fP option of @TIC@,
+e.g., from using the \fB\-x\fP option of \fB@TIC@\fP,
then ncurses also defines keys for the capabilities whose names
-begin with "k".
+begin with \*(``k\*(''.
The corresponding keycodes are generated and (depending on previous
loads of terminal descriptions) may differ from one execution of a
program to the next.
The generated keycodes are recognized by the \fBkeyname\fP function
-(which will then return a name beginning with "k" denoting the
-terminfo capability name rather than "K", used for curses key-names).
+(which will then return a name beginning with \*(``k\*('' denoting the
+terminfo capability name rather than \*(``K\*('', used for curses key-names).
On the other hand, an application can use \fBdefine_key\fP to establish
a specific keycode for a given string.
This makes it possible for an application to check for an extended
-capability's presence with \fItigetstr\fP,
+capability's presence with \fBtigetstr\fP,
and reassign the keycode to match its own needs.
.PP
Low-level applications can use \fBtigetstr\fP to obtain the definition
key definition,
the later definition is the one used.
.SH NOTES
-Note that \fBecho\fR, \fBnoecho\fR, \fBhalfdelay\fR, \fBintrflush\fR,
-\fBmeta\fR, \fBnodelay\fR, \fBnotimeout\fR, \fBnoqiflush\fR,
-\fBqiflush\fR, \fBtimeout\fR, and \fBwtimeout\fR may be macros.
+Note that
+\fBecho\fR,
+\fBnoecho\fR,
+\fBhalfdelay\fR,
+\fBintrflush\fR,
+\fBmeta\fR,
+\fBnl\fR,
+\fBnonl\fR,
+\fBnodelay\fR,
+\fBnotimeout\fR,
+\fBnoqiflush\fR,
+\fBqiflush\fR,
+\fBtimeout\fR, and
+\fBwtimeout\fR may be macros.
.PP
The \fBnoraw\fR and \fBnocbreak\fR calls follow historical practice in that
-they attempt to restore to normal (`cooked') mode from raw and cbreak modes
-respectively.
+they attempt to restore to normal (\*(``cooked\*('') mode
+from raw and cbreak modes respectively.
Mixing raw/noraw and cbreak/nocbreak calls leads to tty driver
control states that are hard to predict or understand; it is not recommended.
.SH SEE ALSO
\fBcurs_initscr\fR(3X),
\fBcurs_util\fR(3X),
\fBdefine_key\fR(3X),
-\fBtermio\fR(7)
+\fBtermios\fR(3)
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