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-<H1 class="no-header">curs_touch 3x</H1>
+<H1 class="no-header">curs_touch 3x 2024-04-20 ncurses 6.4 Library calls</H1>
<PRE>
-<STRONG><A HREF="curs_touch.3x.html">curs_touch(3x)</A></STRONG>
<STRONG><A HREF="curs_touch.3x.html">curs_touch(3x)</A></STRONG>
+<STRONG><A HREF="curs_touch.3x.html">curs_touch(3x)</A></STRONG>
Library calls <STRONG><A HREF="curs_touch.3x.html">curs_touch(3x)</A></STRONG>
</PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
- <STRONG>touchwin</STRONG>, <STRONG>touchline</STRONG>, <STRONG>untouchwin</STRONG>, <STRONG>wtouchln</STRONG>, <STRONG>is_linetouched</STRONG>,
- <STRONG>is_wintouched</STRONG> - <STRONG>curses</STRONG> refresh control routines
+ <STRONG>touchwin</STRONG>, <STRONG>touchline</STRONG>, <STRONG>untouchwin</STRONG>, <STRONG>wtouchln</STRONG>, <STRONG>is_linetouched</STRONG>,
+ <STRONG>is_wintouched</STRONG> - control terminal output refresh in a <EM>curses</EM> window
</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
<STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
- <STRONG>int</STRONG> <STRONG>touchwin(WINDOW</STRONG> <STRONG>*win);</STRONG>
- <STRONG>int</STRONG> <STRONG>touchline(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>int</STRONG> <STRONG>start,</STRONG> <STRONG>int</STRONG> <STRONG>count);</STRONG>
- <STRONG>int</STRONG> <STRONG>untouchwin(WINDOW</STRONG> <STRONG>*win);</STRONG>
- <STRONG>int</STRONG> <STRONG>wtouchln(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>int</STRONG> <STRONG>y,</STRONG> <STRONG>int</STRONG> <STRONG>n,</STRONG> <STRONG>int</STRONG> <STRONG>changed);</STRONG>
- <STRONG>bool</STRONG> <STRONG>is_linetouched(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>int</STRONG> <STRONG>line);</STRONG>
- <STRONG>bool</STRONG> <STRONG>is_wintouched(WINDOW</STRONG> <STRONG>*win);</STRONG>
+
+ <STRONG>int</STRONG> <STRONG>touchline(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>start</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>count</EM><STRONG>);</STRONG>
+
+ <STRONG>int</STRONG> <STRONG>touchwin(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>);</STRONG>
+ <STRONG>int</STRONG> <STRONG>wtouchln(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>y</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>n</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>changed</EM><STRONG>);</STRONG>
+
+ <STRONG>int</STRONG> <STRONG>untouchwin(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>);</STRONG>
+
+ <STRONG>bool</STRONG> <STRONG>is_linetouched(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>line</EM><STRONG>);</STRONG>
+ <STRONG>bool</STRONG> <STRONG>is_wintouched(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>);</STRONG>
</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
- The <STRONG>touchwin</STRONG> and <STRONG>touchline</STRONG> routines throw away all optimization infor-
- mation about which parts of the window have been touched, by pretending
- that the entire window has been drawn on. This is sometimes necessary
- when using overlapping windows, since a change to one window affects
- the other window, but the records of which lines have been changed in
- the other window do not reflect the change. The routine <STRONG>touchline</STRONG> only
- pretends that <EM>count</EM> lines have been changed, beginning with line <EM>start</EM>.
+ The <STRONG>touchwin</STRONG> and <STRONG>touchline</STRONG> routines throw away all optimization
+ information about which parts of the window have been touched, by
+ pretending that the entire window has been drawn on. This is sometimes
+ necessary when using overlapping windows, since a change to one window
+ affects the other window, but the records of which lines have been
+ changed in the other window do not reflect the change. The routine
+ <STRONG>touchline</STRONG> only pretends that <EM>count</EM> lines have been changed, beginning
+ with line <EM>start</EM>.
The <STRONG>untouchwin</STRONG> routine marks all lines in the window as unchanged since
the last call to <STRONG>wrefresh</STRONG>.
- The <STRONG>wtouchln</STRONG> routine makes <EM>n</EM> lines in the window, starting at line <EM>y</EM>,
- look as if they have (<EM>changed</EM><STRONG>=1</STRONG>) or have not (<EM>changed</EM><STRONG>=0</STRONG>) been changed
+ The <STRONG>wtouchln</STRONG> routine makes <EM>n</EM> lines in the window, starting at line <EM>y</EM>,
+ look as if they have (<EM>changed</EM><STRONG>=1</STRONG>) or have not (<EM>changed</EM><STRONG>=0</STRONG>) been changed
since the last call to <STRONG>wrefresh</STRONG>.
- The <STRONG>is_linetouched</STRONG> and <STRONG>is_wintouched</STRONG> routines return <STRONG>TRUE</STRONG> if the speci-
- fied line/window was modified since the last call to <STRONG>wrefresh</STRONG>; other-
- wise they return <STRONG>FALSE</STRONG>. In addition, <STRONG>is_linetouched</STRONG> returns <STRONG>ERR</STRONG> if
- <EM>line</EM> is not valid for the given window.
+ The <STRONG>is_linetouched</STRONG> and <STRONG>is_wintouched</STRONG> routines return <STRONG>TRUE</STRONG> if the
+ specified line/window was modified since the last call to <STRONG>wrefresh</STRONG>;
+ otherwise they return <STRONG>FALSE</STRONG>. In addition, <STRONG>is_linetouched</STRONG> returns <STRONG>ERR</STRONG>
+ if <EM>line</EM> is not valid for the given window.
</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
- All routines return the integer <STRONG>ERR</STRONG> upon failure and an integer value
- other than <STRONG>ERR</STRONG> upon successful completion, unless otherwise noted in
+ All routines return the integer <STRONG>ERR</STRONG> upon failure and an integer value
+ other than <STRONG>ERR</STRONG> upon successful completion, unless otherwise noted in
the preceding routine descriptions.
- X/Open does not define any error conditions. In this implementation
-
- <STRONG>is_linetouched</STRONG>
- returns an error if the window pointer is null, or if the
- line number is outside the window. Note that ERR is dis-
- tinct from <STRONG>TRUE</STRONG> and <STRONG>FALSE</STRONG>, which are the normal return val-
- ues of this function.
+ X/Open Curses does not specify any error conditions. In this
+ implementation
- <STRONG>wtouchln</STRONG>
- returns an error if the window pointer is null, or if the
- line number is outside the window.
+ <STRONG>is_linetouched</STRONG>
+ returns an error if the window pointer is null, or if the line
+ number is outside the window boundaries.
+ The constant <STRONG>ERR</STRONG> is distinct from <STRONG>TRUE</STRONG> and <STRONG>FALSE</STRONG>, which are the
+ normal return values of this function. Because the function
+ returns a <STRONG>bool</STRONG>, returning <STRONG>ERR</STRONG> (which is neither <STRONG>TRUE</STRONG> nor <STRONG>FALSE</STRONG>)
+ may not be supported by the compiler.
-</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
- The XSI Curses standard, Issue 4 describes these functions.
+ To provide error-checking and also match the X/Open function
+ prototype, the <STRONG>ERR</STRONG> is provided by a macro named <STRONG>is_linetouched</STRONG>.
+ The actual function returns <STRONG>FALSE</STRONG> when it detects an error.
- 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>
- <STRONG>win(stdscr)</STRONG> or <STRONG>clear(stdscr)</STRONG>. This will not work under ncurses.
+ <STRONG>wtouchln</STRONG>
+ returns an error if the window pointer is null, or if the line
+ number is outside the window boundaries.
</PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
- Note that all routines except <STRONG>wtouchln</STRONG> may be macros.
+ All of these routines except <STRONG>wtouchln</STRONG> may be macros.
+
+
+</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
+ These functions were introduced by SVr4. The Solaris <EM>curses</EM> header
+ file, for instance, defines both an actual function and macro for each.
+ The macros give the same result as the actual functions. SVr4 <EM>curses</EM>
+ does not check the window parameter <EM>win</EM> to ensure that it is not <STRONG>NULL</STRONG>;
+ otherwise this implementation behaves the same as SVr4.
+
+ X/Open Curses, Issue 4 describes these functions, but defines no error
+ conditions.
</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_refresh.3x.html">curs_refresh(3x)</A></STRONG>, <STRONG><A HREF="curs_variables.3x.html">curs_variables(3x)</A></STRONG>.
+ <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>, <STRONG><A HREF="curs_variables.3x.html">curs_variables(3x)</A></STRONG>
-
<STRONG><A HREF="curs_touch.3x.html">curs_touch(3x)</A></STRONG>
+
ncurses 6.4 2024-04-20 <STRONG><A HREF="curs_touch.3x.html">curs_touch(3x)</A></STRONG>
</PRE>
<div class="nav">
<ul>
<li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
<li><a href="#h2-DESCRIPTION">DESCRIPTION</a></li>
<li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
-<li><a href="#h2-PORTABILITY">PORTABILITY</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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