ncurses 6.1 - patch 20191130
[ncurses.git] / doc / html / man / curs_inch.3x.html
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-  * @Id: curs_inch.3x,v 1.11 1998/11/29 01:04:34 Rick.Ohnemus Exp @
+  * @Id: curs_inch.3x,v 1.22 2019/11/30 21:06:30 tom Exp @
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 <TITLE>curs_inch 3x</TITLE>
 <TITLE>curs_inch 3x</TITLE>
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-<H1>curs_inch 3x</H1>
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+<H1 class="no-header">curs_inch 3x</H1>
 <PRE>
 <PRE>
-<!-- Manpage converted by man2html 3.0.1 -->
-<STRONG><A HREF="curs_inch.3x.html">curs_inch(3x)</A></STRONG>                                       <STRONG><A HREF="curs_inch.3x.html">curs_inch(3x)</A></STRONG>
+<STRONG><A HREF="curs_inch.3x.html">curs_inch(3x)</A></STRONG>                                                    <STRONG><A HREF="curs_inch.3x.html">curs_inch(3x)</A></STRONG>
 
 
 
 
 
 
 
 
-</PRE>
-<H2>NAME</H2><PRE>
-       <STRONG>inch</STRONG>,  <STRONG>winch</STRONG>,  <STRONG>mvinch</STRONG>,  <STRONG>mvwinch</STRONG>  -  get  a  character  and
-       attributes from a <STRONG>curses</STRONG> window
+</PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
+       <STRONG>inch</STRONG>,  <STRONG>winch</STRONG>,  <STRONG>mvinch</STRONG>,  <STRONG>mvwinch</STRONG> - get a character and attributes from a
+       <STRONG>curses</STRONG> window
 
 
 
 
-</PRE>
-<H2>SYNOPSIS</H2><PRE>
+</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
        <STRONG>#include</STRONG> <STRONG>&lt;curses.h&gt;</STRONG>
 
        <STRONG>chtype</STRONG> <STRONG>inch(void);</STRONG>
        <STRONG>#include</STRONG> <STRONG>&lt;curses.h&gt;</STRONG>
 
        <STRONG>chtype</STRONG> <STRONG>inch(void);</STRONG>
        <STRONG>chtype</STRONG> <STRONG>mvwinch(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>int</STRONG> <STRONG>y,</STRONG> <STRONG>int</STRONG> <STRONG>x);</STRONG>
 
 
        <STRONG>chtype</STRONG> <STRONG>mvwinch(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>int</STRONG> <STRONG>y,</STRONG> <STRONG>int</STRONG> <STRONG>x);</STRONG>
 
 
-</PRE>
-<H2>DESCRIPTION</H2><PRE>
-       These routines return the character, of  type  <STRONG>chtype</STRONG>,  at
-       the   current  position  in  the  named  window.   If  any
-       attributes are set for that  position,  their  values  are
-       OR'ed  into  the  value  returned.   Constants  defined in
-       <STRONG>&lt;curses.h&gt;</STRONG> can be used with the <STRONG>&amp;</STRONG> (logical  AND)  operator
-       to extract the character or attributes alone.
+</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
+       These routines return the character, of type  <STRONG>chtype</STRONG>,  at  the  current
+       position in the named window.  If any attributes are set for that posi-
+       tion, their values  are  OR'ed  into  the  value  returned.   Constants
+       defined  in <STRONG>&lt;curses.h&gt;</STRONG> can be used with the <STRONG>&amp;</STRONG> (logical AND) operator to
+       extract the character or attributes alone.
 
 
 
 
-   <STRONG>Attributes</STRONG>
-       The  following  bit-masks  may  be  AND-ed with characters
-       returned by <STRONG>winch</STRONG>.
+</PRE><H3><a name="h3-Attributes">Attributes</a></H3><PRE>
+       The following bit-masks may  be  AND-ed  with  characters  returned  by
+       <STRONG>winch</STRONG>.
 
        <STRONG>A_CHARTEXT</STRONG>     Bit-mask to extract character
        <STRONG>A_ATTRIBUTES</STRONG>   Bit-mask to extract attributes
        <STRONG>A_COLOR</STRONG>        Bit-mask to extract color-pair field information
 
 
 
        <STRONG>A_CHARTEXT</STRONG>     Bit-mask to extract character
        <STRONG>A_ATTRIBUTES</STRONG>   Bit-mask to extract attributes
        <STRONG>A_COLOR</STRONG>        Bit-mask to extract color-pair field information
 
 
-</PRE>
-<H2>NOTES</H2><PRE>
+</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
+       Functions  with  a  "mv"  prefix  first perform a cursor movement using
+       <STRONG>wmove</STRONG>, and return an error if the position is outside the window, or if
+       the window pointer is null.
+
+       The  <STRONG>winch</STRONG>  function  does  not  return an error if the window contains
+       characters larger than 8-bits (255).  Only the low-order 8 bits of  the
+       character are used by <STRONG>winch</STRONG>.
+
+
+</PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
        Note that all of these routines may be macros.
 
 
        Note that all of these routines may be macros.
 
 
-</PRE>
-<H2>PORTABILITY</H2><PRE>
-       These functions are described in the XSI Curses  standard,
-       Issue 4.
+</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
+       These functions are described in the XSI Curses standard, Issue 4.
 
 
+       Very  old systems (before standardization) provide a different function
+       with the same name:
 
 
-</PRE>
-<H2>SEE ALSO</H2><PRE>
-       <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>.
+       <STRONG>o</STRONG>   The <STRONG>winch</STRONG> function was part of the  original  BSD  curses  library,
+           which   stored   a  7-bit  character  combined  with  the  <EM>standout</EM>
+           attribute.
+
+           In BSD curses, <STRONG>winch</STRONG> returned only the character  (as  an  integer)
+           with the <EM>standout</EM> attribute removed.
+
+       <STRONG>o</STRONG>   System  V  curses  added support for several video attributes which
+           could be combined with characters in the window.
+
+           Reflecting this improvement, the function was altered to return the
+           character combined with all video attributes in a <STRONG>chtype</STRONG> value.
+
+       X/Open Curses does not specify the size and layout of attributes, color
+       and character values in <STRONG>chtype</STRONG>; it is  implementation-dependent.   This
+       implementation  uses 8 bits for character values.  An application using
+       more bits, e.g., a Unicode value, should use the wide-character equiva-
+       lents to these functions.
+
+
+</PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
+       <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>
+            gives an overview of the WINDOW and <STRONG>chtype</STRONG> data types.
+
+       <STRONG><A HREF="curs_attr.3x.html">curs_attr(3x)</A></STRONG>
+            goes  into more detail, pointing out portability problems and con-
+            straints on the use of <STRONG>chtype</STRONG> for returning window information.
+
+       <STRONG><A HREF="curs_in_wch.3x.html">curs_in_wch(3x)</A></STRONG>
+            describes comparable functions for the  wide-character  (ncursesw)
+            library.
 
 
 
 
 
 
-                                                    <STRONG><A HREF="curs_inch.3x.html">curs_inch(3x)</A></STRONG>
+                                                                 <STRONG><A HREF="curs_inch.3x.html">curs_inch(3x)</A></STRONG>
 </PRE>
 </PRE>
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-Man(1) output converted with
-<a href="http://www.oac.uci.edu/indiv/ehood/man2html.html">man2html</a>
-</ADDRESS>
+<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-Attributes">Attributes</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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