166 lines
5.8 KiB
Plaintext
166 lines
5.8 KiB
Plaintext
.\"***************************************************************************
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.\" Copyright (c) 2002-2010,2012 Free Software Foundation, Inc. *
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.\" *
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.\" Permission is hereby granted, free of charge, to any person obtaining a *
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.\" copy of this software and associated documentation files (the *
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.\" "Software"), to deal in the Software without restriction, including *
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.\" without limitation the rights to use, copy, modify, merge, publish, *
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.\" distribute, distribute with modifications, sublicense, and/or sell *
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.\" copies of the Software, and to permit persons to whom the Software is *
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.\" furnished to do so, subject to the following conditions: *
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.\" *
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.\" The above copyright notice and this permission notice shall be included *
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.\" in all copies or substantial portions of the Software. *
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.\" *
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
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.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
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.\" IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
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.\" DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
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.\" OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
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.\" THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
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.\" *
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.\" Except as contained in this notice, the name(s) of the above copyright *
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.\" holders shall not be used in advertising or otherwise to promote the *
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.\" sale, use or other dealings in this Software without prior written *
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.\" authorization. *
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.\"***************************************************************************
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.\"
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.\" $Id: curs_get_wch.3x,v 1.8 2012/11/03 23:03:59 tom Exp $
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.TH curs_get_wch 3X ""
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.SH NAME
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\fBget_wch\fR,
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\fBwget_wch\fR,
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\fBmvget_wch\fR,
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\fBmvwget_wch\fR,
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\fBunget_wch\fR \- get (or push back) a wide character from curses terminal keyboard
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.SH SYNOPSIS
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\fB#include <curses.h>\fR
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.sp
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\fBint get_wch(wint_t *\fR\fIwch\fR\fB);\fR
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.br
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\fBint wget_wch(WINDOW *\fR\fIwin\fR\fB, wint_t *\fR\fIwch\fR\fB);\fR
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.br
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\fBint mvget_wch(int \fR\fIy\fR\fB, int \fR\fIx\fR\fB, wint_t *\fR\fIwch\fR\fB);\fR
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.br
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\fBint mvwget_wch(WINDOW *\fR\fIwin\fR\fB, int \fR\fIy\fR\fB, int \fR\fIx\fR\fB, wint_t *\fR\fIwch\fR\fB);\fR
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.br
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\fBint unget_wch(const wchar_t \fR\fIwch\fR\fB);\fR
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.SH DESCRIPTION
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The
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\fBget_wch\fR,
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\fBwget_wch\fR,
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\fBmvget_wch\fR, and
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\fBmvwget_wch\fR
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functions read a character
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from the terminal associated with the current or specified window.
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In no-delay mode,
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if no input is waiting, the value \fBERR\fR is returned.
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In delay mode,
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the program waits until the system passes text through to the program.
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Depending on the setting of \fBcbreak\fR,
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this is after one character (cbreak mode),
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or after the first newline (nocbreak mode).
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In half-delay mode,
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the program waits until the user types a character or the specified
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timeout interval has elapsed.
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.PP
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Unless \fBnoecho\fR has been set,
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these routines echo the character into the designated window.
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.PP
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If the window is not a pad and has been moved or modified since the
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last call to \fBwrefresh\fR,
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\fBwrefresh\fR will be called before another character is read.
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.PP
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If \fBkeypad\fR is enabled,
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these functions respond to
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the pressing of a function key by setting the object pointed to by
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\fIwch\fR
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to the corresponding
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\fBKEY_\fR
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value defined
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in
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\fB<curses.h>\fR
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and returning
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\fBKEY_CODE_YES\fR.
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If a character (such as escape) that could be the
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beginning of a function key is received, curses sets a timer.
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If the remainder
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of the sequence does arrive within the designated time, curses passes through
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the character; otherwise, curses returns the function key value.
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For this
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reason, many terminals experience a delay between the time a user presses
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the escape key and the time the escape is returned to the program.
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.PP
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The
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\fBunget_wch\fR
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function pushes the wide character
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\fIwch\fR
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back onto the head of the input queue, so the wide character
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is returned by the next call to
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\fBget_wch\fR.
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The pushback of
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one character is guaranteed.
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If the program calls
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\fBunget_wch\fR
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too many times without an intervening call to
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\fBget_wch\fR,
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the operation may fail.
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.SH NOTES
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The header file
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\fB<curses.h>\fR
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automatically
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includes the header file
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\fB<stdio.h>\fR.
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.PP
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Applications should not define the escape key by itself as a single-character
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function.
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.PP
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When using
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\fBget_wch\fR,
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\fBwget_wch\fR,
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\fBmvget_wch\fR, or
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\fBmvwget_wch\fR, applications should
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not use
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\fBnocbreak\fR
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mode and
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\fBecho\fR
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mode
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at the same time.
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Depending on the state of the tty driver when each character
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is typed, the program may produce undesirable results.
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.PP
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All functions except \fBwget_wch\fR and \fBunget_wch\fR
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may be macros.
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.SH RETURN VALUE
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When
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\fBget_wch\fR,
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\fBwget_wch\fR,
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\fBmvget_wch\fR, and
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\fBmvwget_wch\fR
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functions successfully
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report the pressing of a function key, they return
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\fBKEY_CODE_YES\fR.
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When they successfully report a wide character, they return
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\fBOK\fR.
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Otherwise, they return
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\fBERR\fR.
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.PP
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Upon successful completion,
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\fBunget_wch\fR
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returns
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\fBOK\fR.
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Otherwise, the function returns
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\fBERR\fR.
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.PP
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Functions with a "mv" prefix first perform a cursor movement using
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\fBwmove\fP, and return an error if the position is outside the window,
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or if the window pointer is null.
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.SH SEE ALSO
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\fBcurses\fR(3X),
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\fBcurs_getch\fR(3X),
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\fBcurs_ins_wch\fR(3X),
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\fBcurs_inopts\fR(3X),
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\fBcurs_move\fR(3X),
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\fBcurs_refresh\fR(3X)
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