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- * @Id: curs_outopts.3x,v 1.28 2017/01/07 19:25:15 tom Exp @
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</PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
<STRONG>clearok</STRONG>, <STRONG>idlok</STRONG>, <STRONG>idcok</STRONG>, <STRONG>immedok</STRONG>, <STRONG>leaveok</STRONG>, <STRONG>setscrreg</STRONG>, <STRONG>wsetscrreg</STRONG>,
- <STRONG>scrollok</STRONG>, <STRONG>nl</STRONG>, <STRONG>nonl</STRONG> - <STRONG>curses</STRONG> output options
+ <STRONG>scrollok</STRONG> - <STRONG>curses</STRONG> output options
</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
<STRONG>void</STRONG> <STRONG>idcok(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>bool</STRONG> <EM>bf</EM><STRONG>);</STRONG>
<STRONG>void</STRONG> <STRONG>immedok(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>bool</STRONG> <EM>bf</EM><STRONG>);</STRONG>
<STRONG>int</STRONG> <STRONG>leaveok(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>bool</STRONG> <EM>bf</EM><STRONG>);</STRONG>
+ <STRONG>int</STRONG> <STRONG>scrollok(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>bool</STRONG> <EM>bf</EM><STRONG>);</STRONG>
+
<STRONG>int</STRONG> <STRONG>setscrreg(int</STRONG> <EM>top</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>bot</EM><STRONG>);</STRONG>
<STRONG>int</STRONG> <STRONG>wsetscrreg(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>top</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>bot</EM><STRONG>);</STRONG>
- <STRONG>int</STRONG> <STRONG>scrollok(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>bool</STRONG> <EM>bf</EM><STRONG>);</STRONG>
- <STRONG>int</STRONG> <STRONG>nl(void);</STRONG>
- <STRONG>int</STRONG> <STRONG>nonl(void);</STRONG>
</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
cursor motions.
-</PRE><H3><a name="h3-setscrreg">setscrreg</a></H3><PRE>
+</PRE><H3><a name="h3-scrollok">scrollok</a></H3><PRE>
+ The <STRONG>scrollok</STRONG> option controls what happens when the cursor of a window
+ is moved off the edge of the window or scrolling region, either as a
+ result of a newline action on the bottom line, or typing the last char-
+ acter of the last line. If disabled, (<EM>bf</EM> is <STRONG>FALSE</STRONG>), the cursor is left
+ on the bottom line. If enabled, (<EM>bf</EM> is <STRONG>TRUE</STRONG>), the window is scrolled
+ up one line (Note that to get the physical scrolling effect on the ter-
+ minal, it is also necessary to call <STRONG>idlok</STRONG>).
+
+
+</PRE><H3><a name="h3-setscrreg_wsetscrreg">setscrreg/wsetscrreg</a></H3><PRE>
The <STRONG>setscrreg</STRONG> and <STRONG>wsetscrreg</STRONG> routines allow the application programmer
to set a software scrolling region in a window. The <EM>top</EM> and <EM>bot</EM> param-
eters are the line numbers of the top and bottom margin of the
line capability, they will probably be used by the output routines.)
-</PRE><H3><a name="h3-scrollok">scrollok</a></H3><PRE>
- The <STRONG>scrollok</STRONG> option controls what happens when the cursor of a window
- is moved off the edge of the window or scrolling region, either as a
- result of a newline action on the bottom line, or typing the last char-
- acter of the last line. If disabled, (<EM>bf</EM> is <STRONG>FALSE</STRONG>), the cursor is left
- on the bottom line. If enabled, (<EM>bf</EM> is <STRONG>TRUE</STRONG>), the window is scrolled
- up one line (Note that to get the physical scrolling effect on the ter-
- minal, it is also necessary to call <STRONG>idlok</STRONG>).
-
-
-</PRE><H3><a name="h3-nl_-nonl">nl, nonl</a></H3><PRE>
- The <STRONG>nl</STRONG> and <STRONG>nonl</STRONG> routines control whether the underlying display device
- translates the return key into newline on input, and whether it trans-
- lates newline into return and line-feed on output (in either case, the
- call <STRONG>addch('\n')</STRONG> does the equivalent of return and line feed on the
- virtual screen). Initially, these translations do occur. If you dis-
- able them using <STRONG>nonl</STRONG>, <STRONG>curses</STRONG> will be able to make better use of the
- line-feed capability, resulting in faster cursor motion. Also, <STRONG>curses</STRONG>
- will then be able to detect the return key.
-
-
</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
- The functions <STRONG>setscrreg</STRONG> and <STRONG>wsetscrreg</STRONG> return <STRONG>OK</STRONG> upon success and <STRONG>ERR</STRONG>
- upon failure. All other routines that return an integer always return
+ The functions <STRONG>setscrreg</STRONG> and <STRONG>wsetscrreg</STRONG> return <STRONG>OK</STRONG> upon success and <STRONG>ERR</STRONG>
+ upon failure. All other routines that return an integer always return
<STRONG>OK</STRONG>.
X/Open Curses does not define any error conditions.
- In this implementation, those functions that have a window pointer will
- return an error if the window pointer is null.
+ In this implementation,
- <STRONG>wclrtoeol</STRONG>
- returns an error if the cursor position is about to wrap.
+ <STRONG>o</STRONG> those functions that have a window pointer will return an error if
+ the window pointer is null
- <STRONG>wsetscrreg</STRONG>
- returns an error if the scrolling region limits extend out-
- side the window.
+ <STRONG>o</STRONG> <STRONG>wsetscrreg</STRONG> returns an error if the scrolling region limits extend
+ outside the window.
- X/Open does not define any error conditions. This implementation re-
+ X/Open does not define any error conditions. This implementation re-
turns an error if the window pointer is null.
</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
These functions are described in the XSI Curses standard, Issue 4.
- The XSI Curses standard is ambiguous on the question of whether <STRONG>raw</STRONG>
- should disable the CRLF translations controlled by <STRONG>nl</STRONG> and <STRONG>nonl</STRONG>. BSD
- curses did turn off these translations; AT&T curses (at least as late
- as SVr1) did not. We choose 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.
+ From the outset, ncurses used <STRONG>nl</STRONG>/<STRONG>nonl</STRONG> to control the conversion of new-
+ lines to carriage return/line-feed on output as well as input. XSI
+ Curses documents only the use of these functions for input. This dif-
+ ference arose from converting the <EM>pcurses</EM> source (which used <STRONG>ioctl</STRONG>
+ calls with the <STRONG>sgttyb</STRONG> structure) to termios (i.e., the POSIX terminal
+ interface). In the former, both input and output were controlled via a
+ single option <STRONG>CRMOD</STRONG>, while the latter separates these features. Be-
+ cause that conversion interferes with output optimization, <STRONG>nl</STRONG>/<STRONG>nonl</STRONG> were
+ amended after ncurses 6.2 to eliminate their effect on output.
Some historic curses implementations had, as an undocumented feature,
the ability to do the equivalent of <STRONG>clearok(...,</STRONG> <STRONG>1)</STRONG> by saying <STRONG>touch-</STRONG>
</PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
- Note that <STRONG>clearok</STRONG>, <STRONG>leaveok</STRONG>, <STRONG>scrollok</STRONG>, <STRONG>idcok</STRONG>, <STRONG>nl</STRONG>, <STRONG>nonl</STRONG> and <STRONG>setscrreg</STRONG> may
- be macros.
+ Note that <STRONG>clearok</STRONG>, <STRONG>leaveok</STRONG>, <STRONG>scrollok</STRONG>, <STRONG>idcok</STRONG>, and <STRONG>setscrreg</STRONG> may be
+ macros.
The <STRONG>immedok</STRONG> routine is useful for windows that are used as terminal em-
ulators.
<li><a href="#h3-idcok">idcok</a></li>
<li><a href="#h3-immedok">immedok</a></li>
<li><a href="#h3-leaveok">leaveok</a></li>
-<li><a href="#h3-setscrreg">setscrreg</a></li>
<li><a href="#h3-scrollok">scrollok</a></li>
-<li><a href="#h3-nl_-nonl">nl, nonl</a></li>
+<li><a href="#h3-setscrreg_wsetscrreg">setscrreg/wsetscrreg</a></li>
</ul>
</li>
<li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
projects / ncurses.git / blobdiff