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<H1>curs_getch 3x</H1>
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<PRE>
-<!-- Manpage converted by man2html 3.0.1 -->
<STRONG><A HREF="curs_getch.3x.html">curs_getch(3x)</A></STRONG> <STRONG><A HREF="curs_getch.3x.html">curs_getch(3x)</A></STRONG>
</PRE>
+<H2>
<a name="h2-NAME">NAME</a></H2><PRE>
<STRONG>getch</STRONG>, <STRONG>wgetch</STRONG>, <STRONG>mvgetch</STRONG>, <STRONG>mvwgetch</STRONG>, <STRONG>ungetch</STRONG>, <STRONG>has_key</STRONG> - get
(or push back) characters from <STRONG>curses</STRONG> terminal keyboard
</PRE>
+<H2>
<a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
<STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
<STRONG>int</STRONG> <STRONG>getch(void);</STRONG>
</PRE>
-<H2>
DESCRIPTION</H2><PRE>
+<H2>
<a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
The <STRONG>getch</STRONG>, <STRONG>wgetch</STRONG>, <STRONG>mvgetch</STRONG> and <STRONG>mvwgetch</STRONG>, routines read a
character from the window. In no-delay mode, if no input
is waiting, the value <STRONG>ERR</STRONG> is returned. In delay mode, the
waits until a character is typed or the specified timeout
has been reached.
- Unless <STRONG>noecho</STRONG> has been set, then the character will also
- be echoed into the designated window according to the fol-
- lowing rules: if the character is the current erase char-
- acter, left arrow, or backspace, the cursor is moved one
- space to the left and that screen position is erased as if
- <STRONG>delch</STRONG> had been called. If the character value is any oth-
- er <STRONG>KEY_</STRONG> define, the user is alerted with a <STRONG>beep</STRONG> call.
- Otherwise the character is simply output to the screen.
+ If <STRONG>echo</STRONG> is enabled, and the window is not a pad, then the
+ character will also be echoed into the designated window
+ according to the following rules:
+
+ <STRONG>o</STRONG> If the character is the current erase character, left
+ arrow, or backspace, the cursor is moved one space to
+ the left and that screen position is erased as if
+ <STRONG>delch</STRONG> had been called.
+
+ <STRONG>o</STRONG> If the character value is any other <STRONG>KEY_</STRONG> define, the
+ user is alerted with a <STRONG>beep</STRONG> call.
+
+ <STRONG>o</STRONG> If the character is a carriage-return, and if <STRONG>nl</STRONG> is
+ enabled, it is translated to a line-feed after echo-
+ ing.
+
+ <STRONG>o</STRONG> Otherwise the character is simply output to the
+ screen.
If the window is not a pad, and it has been moved or modi-
fied since the last call to <STRONG>wrefresh</STRONG>, <STRONG>wrefresh</STRONG> will be
ken for that function key is returned instead of the raw
characters. Possible function keys are defined in <STRONG><curs-</STRONG>
<STRONG>es.h></STRONG> as macros with values outside the range of 8-bit
- characters whose names begin with <STRONG>KEY_</STRONG>. Thus, a variable
+ characters whose names begin with <STRONG>KEY_</STRONG>. Thus, a variable
intended to hold the return value of a function key must
be of short size or larger.
be returned by the next call to <STRONG>wgetch</STRONG>. There is just one
input queue for all windows.
- <STRONG>Function</STRONG> <STRONG>Keys</STRONG>
+
+</PRE>
+<H3><a name="h3-Function-Keys">Function Keys</a></H3><PRE>
The following function keys, defined in <STRONG><curses.h></STRONG>, might
be returned by <STRONG>getch</STRONG> if <STRONG>keypad</STRONG> has been enabled. Note
that not all of these are necessarily supported on any
particular terminal.
-
<EM>Name</EM> <EM>Key</EM> <EM>name</EM>
+ -------------------------------------------------
KEY_BREAK Break key
KEY_DOWN The four arrow keys ...
KEY_UP
KEY_MESSAGE Message key
KEY_MOUSE Mouse event read
KEY_MOVE Move key
+
KEY_NEXT Next object key
KEY_OPEN Open key
KEY_OPTIONS Options key
KEY_REPLACE Replace key
KEY_RESIZE Screen resized
KEY_RESTART Restart key
-
KEY_RESUME Resume key
KEY_SAVE Save key
KEY_SBEG Shifted beginning key
</PRE>
-<H2>
RETURN VALUE</H2><PRE>
+<H2>
<a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
All routines return the integer <STRONG>ERR</STRONG> upon failure and an
integer value other than <STRONG>ERR</STRONG> (<STRONG>OK</STRONG> in the case of ungetch())
upon successful completion.
- <STRONG>ungetch</STRONG>
- returns an error if there is no more room in
- the FIFO.
+ <STRONG>ungetch</STRONG>
+ returns ERR if there is no more room in the FIFO.
+
+ <STRONG>wgetch</STRONG>
+ returns ERR if the window pointer is null, or if
+ its timeout expires without having any data.
- <STRONG>wgetch</STRONG>
- returns an error if the window pointer is
- null, or if its timeout expires without having
- any data.
+ Functions with a "mv" prefix first perform a cursor move-
+ ment using <STRONG>wmove</STRONG>, and return an error if the position is
+ outside the window, or if the window pointer is null.
</PRE>
+<H2>
<a name="h2-NOTES">NOTES</a></H2><PRE>
Use of the escape key by a programmer for a single charac-
ter function is discouraged, as it will cause a delay of
up to one second while the keypad code looks for a follow-
says that <STRONG>KEY_ENTER</STRONG> is control/M, <STRONG>getch</STRONG> will return
<STRONG>KEY_ENTER</STRONG> when you press control/M.
+ Generally, <STRONG>KEY_ENTER</STRONG> denotes the character(s) sent by the
+ <EM>Enter</EM> key on the numeric keypad:
+
+ <STRONG>o</STRONG> the terminal description lists the most useful keys,
+
+ <STRONG>o</STRONG> the <EM>Enter</EM> key on the regular keyboard is already han-
+ dled by the standard ASCII characters for carriage-re-
+ turn and line-feed,
+
+ <STRONG>o</STRONG> depending on whether <STRONG>nl</STRONG> or <STRONG>nonl</STRONG> was called, pressing
+ "Enter" on the regular keyboard may return either a
+ carriage-return or line-feed, and finally
+
+ <STRONG>o</STRONG> "Enter or send" is the standard description for this
+ key.
+
When using <STRONG>getch</STRONG>, <STRONG>wgetch</STRONG>, <STRONG>mvgetch</STRONG>, or <STRONG>mvwgetch</STRONG>, nocbreak
mode (<STRONG>nocbreak</STRONG>) and echo mode (<STRONG>echo</STRONG>) should not be used at
the same time. Depending on the state of the tty driver
</PRE>
-<H2>
PORTABILITY</H2><PRE>
+<H2>
<a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
The *get* functions are described in the XSI Curses stan-
dard, Issue 4. They read single-byte characters only.
The standard specifies that they return <STRONG>ERR</STRONG> on failure,
documentation. Under historical curses implementations,
it varied depending on whether the operating system's im-
plementation of handled signal receipt interrupts a
- <STRONG><A HREF="read.2.html">read(2)</A></STRONG> call in progress or not, and also (in some imple-
+ <STRONG>read(2)</STRONG> call in progress or not, and also (in some imple-
mentations) depending on whether an input timeout or non-
blocking mode has been set.
</PRE>
-<H2>SEE ALSO</H2><PRE>
- <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="curs_inopts.3x.html">curs_inopts(3x)</A></STRONG>, <STRONG><A HREF="curs_mouse.3x.html">curs_mouse(3x)</A></STRONG>,
- <STRONG><A HREF="curs_move.3x.html">curs_move(3x)</A></STRONG>, <STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>, <STRONG><A HREF="resizeterm.3x.html">resizeterm(3x)</A></STRONG>.
+<H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
+ <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="curs_inopts.3x.html">curs_inopts(3x)</A></STRONG>, <STRONG><A HREF="curs_outopts.3x.html">curs_outopts(3x)</A></STRONG>,
+ <STRONG><A HREF="curs_mouse.3x.html">curs_mouse(3x)</A></STRONG>, <STRONG><A HREF="curs_move.3x.html">curs_move(3x)</A></STRONG>, <STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>, <STRONG>re-</STRONG>
+ <STRONG><A HREF="resizeterm.3x.html">sizeterm(3x)</A></STRONG>.
- Comparable functions in the wide-character (ncursesw) li-
+ Comparable functions in the wide-character (ncursesw) li-
brary are described in <STRONG><A HREF="curs_get_wch.3x.html">curs_get_wch(3x)</A></STRONG>.
<STRONG><A HREF="curs_getch.3x.html">curs_getch(3x)</A></STRONG>
</PRE>
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+<div class="nav">
+<ul>
+<li><a href="#h2-NAME">NAME</a></li>
+<li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
+<li><a href="#h2-DESCRIPTION">DESCRIPTION</a>
+<ul>
+<li><a href="#h3-Function-Keys">Function Keys</a></li>
+</ul>
+</li>
+<li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
+<li><a href="#h2-NOTES">NOTES</a></li>
+<li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
+<li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
+</ul>
+</div>
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