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<H1 class="no-header">curs_kernel 3x 2024-04-20 ncurses 6.5 Library calls</H1>
<PRE>
<STRONG><A HREF="curs_kernel.3x.html">curs_kernel(3x)</A></STRONG> Library calls <STRONG><A HREF="curs_kernel.3x.html">curs_kernel(3x)</A></STRONG>
</PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
<STRONG>def_prog_mode</STRONG>, <STRONG>def_shell_mode</STRONG>, <STRONG>reset_prog_mode</STRONG>, <STRONG>reset_shell_mode</STRONG>,
<STRONG>resetty</STRONG>, <STRONG>savetty</STRONG>, <STRONG>getsyx</STRONG>, <STRONG>setsyx</STRONG>, <STRONG>ripoffline</STRONG>, <STRONG>curs_set</STRONG>, <STRONG>napms</STRONG> - low-
level <EM>curses</EM> routines
</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
<STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
<STRONG>int</STRONG> <STRONG>def_prog_mode(void);</STRONG>
<STRONG>int</STRONG> <STRONG>def_shell_mode(void);</STRONG>
<STRONG>int</STRONG> <STRONG>reset_prog_mode(void);</STRONG>
<STRONG>int</STRONG> <STRONG>reset_shell_mode(void);</STRONG>
<STRONG>int</STRONG> <STRONG>resetty(void);</STRONG>
<STRONG>int</STRONG> <STRONG>savetty(void);</STRONG>
<STRONG>void</STRONG> <STRONG>getsyx(int</STRONG> <EM>y</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>x</EM><STRONG>);</STRONG>
<STRONG>void</STRONG> <STRONG>setsyx(int</STRONG> <EM>y</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>x</EM><STRONG>);</STRONG>
<STRONG>int</STRONG> <STRONG>ripoffline(int</STRONG> <EM>line</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <STRONG>(*</STRONG><EM>init</EM><STRONG>)(WINDOW</STRONG> <STRONG>*,</STRONG> <STRONG>int));</STRONG>
<STRONG>int</STRONG> <STRONG>curs_set(int</STRONG> <EM>visibility</EM><STRONG>);</STRONG>
<STRONG>int</STRONG> <STRONG>napms(int</STRONG> <EM>ms</EM><STRONG>);</STRONG>
</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
The following routines give low-level access to various <STRONG>curses</STRONG>
capabilities. These routines typically are used inside library
routines.
</PRE><H3><a name="h3-def_prog_mode_def_shell_mode">def_prog_mode, def_shell_mode</a></H3><PRE>
The <STRONG>def_prog_mode</STRONG> and <STRONG>def_shell_mode</STRONG> routines save the current terminal
modes as the "program" (in <STRONG>curses</STRONG>) or "shell" (not in <STRONG>curses</STRONG>) state for
use by the <STRONG>reset_prog_mode</STRONG> and <STRONG>reset_shell_mode</STRONG> routines. This is done
automatically by <STRONG>initscr</STRONG>. There is one such save area for each screen
context allocated by <STRONG>newterm</STRONG>.
</PRE><H3><a name="h3-reset_prog_mode_reset_shell_mode">reset_prog_mode, reset_shell_mode</a></H3><PRE>
The <STRONG>reset_prog_mode</STRONG> and <STRONG>reset_shell_mode</STRONG> routines restore the terminal
to "program" (in <STRONG>curses</STRONG>) or "shell" (out of <STRONG>curses</STRONG>) state. These are
done automatically by <STRONG><A HREF="curs_initscr.3x.html">endwin(3x)</A></STRONG> and, after an <STRONG>endwin</STRONG>, by <STRONG>doupdate</STRONG>, so
they normally are not called.
</PRE><H3><a name="h3-resetty_savetty">resetty, savetty</a></H3><PRE>
The <STRONG>resetty</STRONG> and <STRONG>savetty</STRONG> routines save and restore the state of the
terminal modes. <STRONG>savetty</STRONG> saves the current state in a buffer and
<STRONG>resetty</STRONG> restores the state to what it was at the last call to <STRONG>savetty</STRONG>.
</PRE><H3><a name="h3-getsyx">getsyx</a></H3><PRE>
The <STRONG>getsyx</STRONG> routine returns the current coordinates of the <EM>virtual</EM>
<EM>screen</EM> cursor in <EM>y</EM> and <EM>x</EM>. If <STRONG>leaveok</STRONG> is currently <STRONG>TRUE</STRONG>, then <STRONG>-1</STRONG>,<STRONG>-1</STRONG> is
returned. If lines have been removed from the top of the screen, using
<STRONG>ripoffline</STRONG>, <EM>y</EM> and <EM>x</EM> include these lines; therefore, <EM>y</EM> and <EM>x</EM> should be
used only as arguments for <STRONG>setsyx</STRONG>.
Few applications will use this feature, most use <STRONG>getyx</STRONG> instead.
</PRE><H3><a name="h3-setsyx">setsyx</a></H3><PRE>
The <STRONG>setsyx</STRONG> routine sets the <EM>virtual</EM> <EM>screen</EM> cursor to <EM>y</EM>, <EM>x</EM>. If <EM>y</EM> and <EM>x</EM>
are both <STRONG>-1</STRONG>, then <STRONG>leaveok</STRONG> is set. The two routines <STRONG>getsyx</STRONG> and <STRONG>setsyx</STRONG>
are designed to be used by a library routine, which manipulates <STRONG>curses</STRONG>
windows but does not want to change the current position of the
program's cursor. The library routine would call <STRONG>getsyx</STRONG> at the
beginning, do its manipulation of its own windows, do a <STRONG>wnoutrefresh</STRONG> on
its windows, call <STRONG>setsyx</STRONG>, and then call <STRONG>doupdate</STRONG>.
Few applications will use this feature, most use <STRONG>wmove</STRONG> instead.
</PRE><H3><a name="h3-ripoffline">ripoffline</a></H3><PRE>
<STRONG>ripoffline</STRONG> provides access to the same facility that <STRONG><A HREF="curs_slk.3x.html">slk_init(3x)</A></STRONG> uses
to reduce the size of the screen. <STRONG>ripoffline</STRONG> must be called before
<STRONG>initscr</STRONG> or <STRONG>newterm</STRONG> is called, to prepare these initial actions:
<STRONG>o</STRONG> If <EM>line</EM> is positive, a line is removed from the top of <STRONG>stdscr</STRONG>.
<STRONG>o</STRONG> if <EM>line</EM> is negative, a line is removed from the bottom.
When the resulting initialization is done inside <STRONG>initscr</STRONG>, the routine
<STRONG>init</STRONG> (supplied by the user) is called with two arguments:
<STRONG>o</STRONG> a window pointer to the one-line window that has been allocated and
<STRONG>o</STRONG> an integer with the number of columns in the window.
Inside this initialization routine, the integer variables <STRONG>LINES</STRONG> and
<STRONG>COLS</STRONG> (defined in <STRONG><curses.h></STRONG>) are not guaranteed to be accurate and
<STRONG>wrefresh</STRONG> or <STRONG>doupdate</STRONG> must not be called. It is allowable to call
<STRONG>wnoutrefresh</STRONG> during the initialization routine.
<STRONG>ripoffline</STRONG> can be called up to five times before calling <STRONG>initscr</STRONG> or
<STRONG>newterm</STRONG>.
</PRE><H3><a name="h3-curs_set">curs_set</a></H3><PRE>
The <STRONG>curs_set</STRONG> routine sets the cursor state to invisible, normal, or
very visible for <STRONG>visibility</STRONG> equal to <STRONG>0</STRONG>, <STRONG>1</STRONG>, or <STRONG>2</STRONG> respectively. If the
terminal supports the <EM>visibility</EM> requested, the previous <EM>cursor</EM> state
is returned; otherwise, <STRONG>ERR</STRONG> is returned.
</PRE><H3><a name="h3-napms">napms</a></H3><PRE>
<STRONG>napms</STRONG> sleeps for <EM>ms</EM> milliseconds. If <EM>ms</EM> exceeds 30,000 (thirty
seconds), it is capped at that value.
</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
Except for <STRONG>curs_set</STRONG>, these routines always return <STRONG>OK</STRONG>.
<STRONG>curs_set</STRONG> returns the previous cursor state, or <STRONG>ERR</STRONG> if the requested
<EM>visibility</EM> is not supported.
X/Open defines no error conditions. In this implementation
<STRONG>def_prog_mode</STRONG>, <STRONG>def_shell_mode</STRONG>, <STRONG>reset_prog_mode</STRONG>, <STRONG>reset_shell_mode</STRONG>
return an error if the terminal was not initialized, or if the I/O
call to obtain the terminal settings fails.
<STRONG>ripoffline</STRONG>
returns an error if the maximum number of ripped-off lines exceeds
the maximum (5).
</PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
Note that <STRONG>getsyx</STRONG> is a macro, so <STRONG>&</STRONG> is not necessary before the variables
<EM>y</EM> and <EM>x</EM>.
Older SVr4 man pages warn that the return value of <STRONG>curs_set</STRONG> "is
currently incorrect". This implementation gets it right, but it may be
unwise to count on the correctness of the return value anywhere else.
Both <EM>ncurses</EM> and SVr4 will call <STRONG>curs_set</STRONG> in <STRONG>endwin</STRONG> if <STRONG>curs_set</STRONG> has been
called to make the cursor other than normal, i.e., either invisible or
very visible. There is no way for <EM>ncurses</EM> to determine the initial
cursor state to restore that.
</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
The <EM>virtual</EM> <EM>screen</EM> functions <STRONG>setsyx</STRONG> and <STRONG>getsyx</STRONG> are not described in
X/Open Curses, Issue 4. All other functions are as described in X/Open
Curses.
The SVr4 documentation describes <STRONG>setsyx</STRONG> and <STRONG>getsyx</STRONG> as having return
type int. This is misleading, as they are macros with no documented
semantics for the return value.
If interrupted, <EM>ncurses</EM> restarts <STRONG>napms</STRONG>. That, and the limitation to 30
seconds, are different from other implementations.
</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_initscr.3x.html">curs_initscr(3x)</A></STRONG>, <STRONG><A HREF="curs_outopts.3x.html">curs_outopts(3x)</A></STRONG>, <STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>,
<STRONG><A HREF="curs_scr_dump.3x.html">curs_scr_dump(3x)</A></STRONG>, <STRONG><A HREF="curs_slk.3x.html">curs_slk(3x)</A></STRONG>, <STRONG><A HREF="curs_variables.3x.html">curs_variables(3x)</A></STRONG>
ncurses 6.5 2024-04-20 <STRONG><A HREF="curs_kernel.3x.html">curs_kernel(3x)</A></STRONG>
</PRE>
<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-def_prog_mode_def_shell_mode">def_prog_mode, def_shell_mode</a></li>
<li><a href="#h3-reset_prog_mode_reset_shell_mode">reset_prog_mode, reset_shell_mode</a></li>
<li><a href="#h3-resetty_savetty">resetty, savetty</a></li>
<li><a href="#h3-getsyx">getsyx</a></li>
<li><a href="#h3-setsyx">setsyx</a></li>
<li><a href="#h3-ripoffline">ripoffline</a></li>
<li><a href="#h3-curs_set">curs_set</a></li>
<li><a href="#h3-napms">napms</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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