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- * Copyright (c) 2002-2010,2012 Free Software Foundation, Inc. *
+ * Copyright (c) 2002-2012,2016 Free Software Foundation, Inc. *
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- * @Id: curs_get_wch.3x,v 1.8 2012/11/03 23:03:59 tom Exp @
+ * @Id: curs_get_wch.3x,v 1.9 2016/05/15 01:12:50 tom Exp @
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-</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 key-
- board
+</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
-</PRE>
-<H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
+</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
<STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
<STRONG>int</STRONG> <STRONG>get_wch(wint_t</STRONG> <STRONG>*</STRONG><EM>wch</EM><STRONG>);</STRONG>
<STRONG>int</STRONG> <STRONG>unget_wch(const</STRONG> <STRONG>wchar_t</STRONG> <EM>wch</EM><STRONG>);</STRONG>
-</PRE>
-<H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
+</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
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.
+ current or specified window. In no-delay mode, if no in-
+ put 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 new-
+ line (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 char-
acter into the designated window.
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 corresponding <STRONG>KEY_</STRONG> value defined in
- <STRONG><curses.h></STRONG> 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 <STRONG>unget_wch</STRONG> function pushes the wide character <EM>wch</EM> back
+ 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 func-
+ tion key value. For this reason, many terminals experi-
+ ence 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 char-
+ acters. Their names begin with <STRONG>KEY_</STRONG>.
+
+ <STRONG>o</STRONG> Other (user-defined) function keys which may be de-
+ fined 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.
+
+ 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 program calls <STRONG>unget_wch</STRONG>
+ 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.
-</PRE>
-<H2><a name="h2-NOTES">NOTES</a></H2><PRE>
- The header file <STRONG><curses.h></STRONG> automatically includes the
+</PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
+ The header file <STRONG><curses.h></STRONG> automatically includes the
header file <STRONG><stdio.h></STRONG>.
Applications should not define the escape key by itself as
a single-character function.
- When using <STRONG>get_wch</STRONG>, <STRONG>wget_wch</STRONG>, <STRONG>mvget_wch</STRONG>, or <STRONG>mvwget_wch</STRONG>,
+ 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 program may produce
- undesirable results.
+ the same time. Depending on the state of the tty driver
+ when each character is typed, the program may produce un-
+ desirable 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> func-
- tions successfully report the pressing of a function key,
+</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> func-
+ tions 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
+ wide character, they return <STRONG>OK</STRONG>. Otherwise, they return
<STRONG>ERR</STRONG>.
- Upon successful completion, <STRONG>unget_wch</STRONG> returns <STRONG>OK</STRONG>. Other-
+ Upon successful completion, <STRONG>unget_wch</STRONG> returns <STRONG>OK</STRONG>. Other-
wise, the function returns <STRONG>ERR</STRONG>.
- Functions with a "mv" prefix first perform a cursor move-
- ment using <STRONG>wmove</STRONG>, and return an error if the position is
+ 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-SEE-ALSO">SEE ALSO</a></H2><PRE>
- <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="curs_getch.3x.html">curs_getch(3x)</A></STRONG>, <STRONG><A HREF="curs_ins_wch.3x.html">curs_ins_wch(3x)</A></STRONG>,
- <STRONG><A HREF="curs_inopts.3x.html">curs_inopts(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>
+</PRE><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_getch.3x.html">curs_getch(3x)</A></STRONG>, <STRONG><A HREF="curs_ins_wch.3x.html">curs_ins_wch(3x)</A></STRONG>, <STRONG>curs_in-</STRONG>
+ <STRONG><A HREF="curs_inopts.3x.html">opts(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>
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