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- * @Id: curs_window.3x,v 1.43 2023/11/25 14:17:29 tom Exp @
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-<H1 class="no-header">curs_window 3x 2023-11-25 ncurses 6.4 Library calls</H1>
+<H1 class="no-header">curs_window 3x 2024-06-01 ncurses 6.5 Library calls</H1>
<PRE>
<STRONG><A HREF="curs_window.3x.html">curs_window(3x)</A></STRONG> Library calls <STRONG><A HREF="curs_window.3x.html">curs_window(3x)</A></STRONG>
X/Open defines no error conditions. In this implementation
<STRONG>delwin</STRONG>
- returns an error if the window pointer is null, or if the window
- is the parent of another window.
+ returns <STRONG>ERR</STRONG> if the window pointer is null, or if the window is the
+ parent of another window.
<STRONG>derwin</STRONG>
- returns an error if the parent window pointer is null, or if any
- of its ordinates or dimensions is negative, or if the resulting
- window does not fit inside the parent window.
+ returns <STRONG>ERR</STRONG> if the parent window pointer is null, or if any of its
+ ordinates or dimensions is negative, or if the resulting window
+ does not fit inside the parent window.
<STRONG>dupwin</STRONG>
- returns an error if the window pointer is null.
+ returns <STRONG>ERR</STRONG> if the window pointer is null.
This implementation also maintains a list of windows, and checks
that the pointer passed to <STRONG>delwin</STRONG> is one that it created,
returning an error if it was not..
<STRONG>mvderwin</STRONG>
- returns an error if the window pointer is null, or if some part of
- the window would be placed off-screen.
+ returns <STRONG>ERR</STRONG> if the window pointer is null, or if some part of the
+ window would be placed off-screen.
<STRONG>mvwin</STRONG>
- returns an error if the window pointer is null, or if the window
- is really a pad, or if some part of the window would be placed
- off-screen.
+ returns <STRONG>ERR</STRONG> if the window pointer is null, or if the window is
+ really a pad, or if some part of the window would be placed off-
+ screen.
<STRONG>newwin</STRONG>
will fail if either of its beginning ordinates is negative, or if
either the number of lines or columns is negative.
<STRONG>syncok</STRONG>
- returns an error if the window pointer is null.
+ returns <STRONG>ERR</STRONG> if the window pointer is null.
<STRONG>subwin</STRONG>
- returns an error if the parent window pointer is null, or if any
- of its ordinates or dimensions is negative, or if the resulting
- window does not fit inside the parent window.
+ returns <STRONG>ERR</STRONG> if the parent window pointer is null, or if any of its
+ ordinates or dimensions is negative, or if the resulting window
+ does not fit inside the parent window.
The functions which return a window pointer may also fail if there is
insufficient memory for its data structures. Any of these functions
</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
- The XSI Curses standard, Issue 4 describes these functions.
+ X/Open Curses, Issue 4 describes these functions.
- X/Open Curses states regarding <STRONG>delwin</STRONG>:
+ Regarding <EM>delwin</EM>, X/Open Curses states that
- <STRONG>o</STRONG> It must delete subwindows before deleting their parent.
+ [t]he application must delete subwindows before deleting the
+ main window.
- <STRONG>o</STRONG> If <STRONG>delwin</STRONG> is asked to delete a parent window, it can only succeed
- if the curses library keeps a list of the subwindows. SVr4 curses
- kept a count of the number of subwindows rather than a list. It
- simply returned <STRONG>ERR</STRONG> when asked to delete a subwindow. Solaris
- X/Open curses does not even make that check, and will delete a
- parent window which still has subwindows.
+ If <EM>delwin</EM> is asked to delete a parent window, it can succeed only if
+ the <EM>curses</EM> library keeps a list of its subwindows. SVr4 <EM>curses</EM> kept a
+ count of the number of subwindows rather than a list. It simply
+ returned <STRONG>ERR</STRONG> when asked to delete a subwindow. Solaris X/Open <EM>curses</EM>
+ (<EM>xcurses</EM>) does not make even that check, and will delete a parent
+ window that still has subwindows. <EM>PDCurses</EM> also behaves this way.
- <STRONG>o</STRONG> Since release 4.0 (1996), ncurses maintains a list of windows for
- each screen, to ensure that a window has no subwindows before
- allowing deletion.
+ <EM>ncurses</EM> 4.0 (1996) and later maintains a list of windows for each
+ screen to ensure that a window has no subwindows before allowing its
+ deletion. NetBSD <EM>curses</EM> has followed suit since 2003.
- <STRONG>o</STRONG> NetBSD copied this feature of ncurses in 2003.
- PDCurses follows the scheme used in Solaris X/Open curses.
-
-
-</PRE><H2><a name="h2-BUGS">BUGS</a></H2><PRE>
- The subwindow functions <STRONG>subwin</STRONG>, <STRONG>derwin</STRONG>, <STRONG>mvderwin</STRONG>, <STRONG>wsyncup</STRONG>, <STRONG>wsyncdown</STRONG>,
- <STRONG>wcursyncup</STRONG>, and <STRONG>syncok</STRONG> are flaky, incompletely implemented, and not
- well tested.
-
- System V's <EM>curses</EM> documentation is unclear about what <STRONG>wsyncup</STRONG> and
- <STRONG>wsyncdown</STRONG> actually do. It seems to imply that they are supposed to
- touch only those lines that are affected by changes to a window's
- ancestors. The language here, and behavior of <EM>ncurses</EM>, is patterned on
+ SVr4 <EM>curses</EM> documentation is unclear about what <EM>wsyncup</EM> and <EM>wsyncdown</EM>
+ actually do. It seems to imply that they are supposed to touch only
+ those lines that are affected by changes to a window's ancestors. The
+ description and behavior of these functions in <EM>ncurses</EM> is patterned on
the X/Open Curses standard; this approach may result in slower updates.
</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_refresh.3x.html">curs_refresh(3x)</A></STRONG>, <STRONG><A HREF="curs_touch.3x.html">curs_touch(3x)</A></STRONG>,
+ <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_refresh.3x.html">curs_refresh(3x)</A></STRONG>, <STRONG><A HREF="curs_touch.3x.html">curs_touch(3x)</A></STRONG>,
<STRONG><A HREF="curs_variables.3x.html">curs_variables(3x)</A></STRONG>
-ncurses 6.
4 2023-11-25 <STRONG><A HREF="curs_window.3x.html">curs_window(3x)</A></STRONG>
+ncurses 6.
5 2024-06-01 <STRONG><A HREF="curs_window.3x.html">curs_window(3x)</A></STRONG>
</PRE>
<div class="nav">
<ul>
<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-BUGS">BUGS</a></li>
<li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
</ul>
</div>
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