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+<TITLE>curs_get_wch 3x 2023-09-16 ncurses 6.4 Library calls</TITLE>
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-<H1 class="no-header">curs_get_wch 3x 2022-02-12 ncurses 6.4 Library calls</H1>
+<H1 class="no-header">curs_get_wch 3x 2023-09-16 ncurses 6.4 Library calls</H1>
<PRE>
<STRONG><A HREF="curs_get_wch.3x.html">curs_get_wch(3x)</A></STRONG> Library calls <STRONG><A HREF="curs_get_wch.3x.html">curs_get_wch(3x)</A></STRONG>
</PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
- <STRONG>get_wch</STRONG>, <STRONG>wget_wch</STRONG>, <STRONG>mvget_wch</STRONG>, <STRONG>mvwget_wch</STRONG>, <STRONG>unget_wch</STRONG> - get (or push
- back) a wide character from curses terminal keyboard
+ <STRONG>get_wch</STRONG>, <STRONG>wget_wch</STRONG>, <STRONG>mvget_wch</STRONG>, <STRONG>mvwget_wch</STRONG>, <STRONG>unget_wch</STRONG> - get (or push
+ back) a wide character from <EM>curses</EM> terminal keyboard
</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
</PRE><H3><a name="h3-wget_wch">wget_wch</a></H3><PRE>
- The <STRONG>get_wch</STRONG>, <STRONG>wget_wch</STRONG>, <STRONG>mvget_wch</STRONG>, and <STRONG>mvwget_wch</STRONG> functions read a char-
- acter from the terminal associated with the current or specified win-
- dow. In no-delay mode, if no input is waiting, the value <STRONG>ERR</STRONG> is re-
- turned. In delay mode, the program waits until the system passes text
- through to the program. Depending on the setting of <STRONG>cbreak</STRONG>, this is
- after one character (cbreak mode), or after the first newline (nocbreak
- mode). In half-delay mode, the program waits until the user types a
- character or the specified timeout interval has elapsed.
+ The <STRONG>get_wch</STRONG>, <STRONG>wget_wch</STRONG>, <STRONG>mvget_wch</STRONG>, and <STRONG>mvwget_wch</STRONG> functions read a
+ character from the terminal associated with the current or specified
+ window. In no-delay mode, if no input is waiting, the value <STRONG>ERR</STRONG> is
+ returned. In delay mode, the program waits until the system passes
+ text through to the program. Depending on the setting of <STRONG>cbreak</STRONG>, this
+ is after one character (cbreak mode), or after the first newline
+ (nocbreak mode). In half-delay mode, the program waits until the user
+ types a character or the specified timeout interval has elapsed.
Unless <STRONG>noecho</STRONG> has been set, these routines echo the character into the
designated window.
is read.
If <STRONG>keypad</STRONG> is enabled, these functions respond to the pressing of a
- function key by setting the object pointed to by <EM>wch</EM> to the keycode as-
- signed to the function key, and returning <STRONG>KEY_CODE_YES</STRONG>. If a character
- (such as escape) that could be the beginning of a function key is re-
- ceived, curses sets a timer. If the remainder of the sequence does ar-
- rive within the designated time, curses passes through the character;
- otherwise, curses returns the function key value. For this reason,
- many terminals experience a delay between the time a user presses the
- escape key and the time the escape is returned to the program.
+ function key by setting the object pointed to by <EM>wch</EM> to the keycode
+ assigned to the function key, and returning <STRONG>KEY_CODE_YES</STRONG>. If a
+ character (such as escape) that could be the beginning of a function
+ key is received, curses sets a timer. If the remainder of the sequence
+ does arrive within the designated time, curses passes through the
+ character; otherwise, curses returns the function key value. For this
+ reason, many terminals experience a delay between the time a user
+ presses the escape key and the time the escape is returned to the
+ program.
The keycodes returned by these functions are the same as those returned
by <STRONG>wgetch</STRONG>:
- <STRONG>o</STRONG> The predefined function keys are listed in <STRONG><curses.h></STRONG> as macros
- with values outside the range of 8-bit characters. Their names be-
- gin with <STRONG>KEY_</STRONG>.
+ <STRONG>o</STRONG> The predefined function keys are listed in <STRONG><curses.h></STRONG> as macros
+ with values outside the range of 8-bit characters. Their names
+ begin with <STRONG>KEY_</STRONG>.
- <STRONG>o</STRONG> Other (user-defined) function keys which may be defined using <STRONG>de-</STRONG>
- <STRONG><A HREF="define_key.3x.html">fine_key(3x)</A></STRONG> have no names, but also are expected to have values
+ <STRONG>o</STRONG> Other (user-defined) function keys which may be defined using
+ <STRONG><A HREF="define_key.3x.html">define_key(3x)</A></STRONG> have no names, but also are expected to have values
outside the range of 8-bit characters.
</PRE><H3><a name="h3-unget_wch">unget_wch</a></H3><PRE>
The <STRONG>unget_wch</STRONG> function pushes the wide character <EM>wch</EM> back onto the head
- of the input queue, so the wide character is returned by the next call
- to <STRONG>get_wch</STRONG>. The pushback of one character is guaranteed. If the pro-
- gram calls <STRONG>unget_wch</STRONG> too many times without an intervening call to
+ of the input queue, so the wide character is returned by the next call
+ to <STRONG>get_wch</STRONG>. The pushback of one character is guaranteed. If the
+ program calls <STRONG>unget_wch</STRONG> too many times without an intervening call to
<STRONG>get_wch</STRONG>, the operation may fail.
- Unlike <STRONG>ungetch</STRONG> and <STRONG>wgetch</STRONG>, <STRONG>unget_wch</STRONG> cannot distinguish special charac-
- ters returned by <STRONG>wget_wch</STRONG> from ordinary characters. An application can
- push special keys which it may read via <STRONG>wget_wch</STRONG> by checking for the
- <STRONG>KEY_CODE_YES</STRONG> result, and using <STRONG>ungetch</STRONG> for those special keys.
+ Unlike <STRONG>ungetch</STRONG> and <STRONG>wgetch</STRONG>, <STRONG>unget_wch</STRONG> cannot distinguish special
+ characters returned by <STRONG>wget_wch</STRONG> from ordinary characters. An
+ application can push special keys which it may read via <STRONG>wget_wch</STRONG> by
+ checking for the <STRONG>KEY_CODE_YES</STRONG> result, and using <STRONG>ungetch</STRONG> for those
+ special keys.
</PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
When using <STRONG>get_wch</STRONG>, <STRONG>wget_wch</STRONG>, <STRONG>mvget_wch</STRONG>, or <STRONG>mvwget_wch</STRONG>, applications
should not use <STRONG>nocbreak</STRONG> mode and <STRONG>echo</STRONG> mode at the same time. Depending
- on the state of the tty driver when each character is typed, the pro-
- gram may produce undesirable results.
+ on the state of the tty driver when each character is typed, the
+ program may produce undesirable results.
All functions except <STRONG>wget_wch</STRONG> and <STRONG>unget_wch</STRONG> may be macros.
</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
- When <STRONG>get_wch</STRONG>, <STRONG>wget_wch</STRONG>, <STRONG>mvget_wch</STRONG>, and <STRONG>mvwget_wch</STRONG> functions successful-
- ly report the pressing of a function key, they return <STRONG>KEY_CODE_YES</STRONG>.
- When they successfully report a wide character, they return <STRONG>OK</STRONG>. Other-
- wise, they return <STRONG>ERR</STRONG>.
+ When <STRONG>get_wch</STRONG>, <STRONG>wget_wch</STRONG>, <STRONG>mvget_wch</STRONG>, and <STRONG>mvwget_wch</STRONG> functions
+ successfully report the pressing of a function key, they return
+ <STRONG>KEY_CODE_YES</STRONG>. When they successfully report a wide character, they
+ return <STRONG>OK</STRONG>. Otherwise, they return <STRONG>ERR</STRONG>.
- Upon successful completion, <STRONG>unget_wch</STRONG> returns <STRONG>OK</STRONG>. Otherwise, the func-
- tion returns <STRONG>ERR</STRONG>.
+ Upon successful completion, <STRONG>unget_wch</STRONG> returns <STRONG>OK</STRONG>. Otherwise, the
+ function returns <STRONG>ERR</STRONG>.
Functions with a "mv" prefix first perform a cursor movement using
<STRONG>wmove</STRONG>, and return an error if the position is outside the window, or if
-ncurses 6.4 202
2-02-12 <STRONG><A HREF="curs_get_wch.3x.html">curs_get_wch(3x)</A></STRONG>
+ncurses 6.4 202
3-09-16 <STRONG><A HREF="curs_get_wch.3x.html">curs_get_wch(3x)</A></STRONG>
</PRE>
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