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30 * @Id: curs_inch.3x,v 1.20 2017/11/18 23:47:37 tom Exp @
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42 <H1 class="no-header">curs_inch 3x</H1>
44 <STRONG><A HREF="curs_inch.3x.html">curs_inch(3x)</A></STRONG> <STRONG><A HREF="curs_inch.3x.html">curs_inch(3x)</A></STRONG>
49 </PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
50 <STRONG>inch</STRONG>, <STRONG>winch</STRONG>, <STRONG>mvinch</STRONG>, <STRONG>mvwinch</STRONG> - get a character and attributes from a
51 <STRONG>curses</STRONG> window
54 </PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
55 <STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
57 <STRONG>chtype</STRONG> <STRONG>inch(void);</STRONG>
58 <STRONG>chtype</STRONG> <STRONG>winch(WINDOW</STRONG> <STRONG>*win);</STRONG>
59 <STRONG>chtype</STRONG> <STRONG>mvinch(int</STRONG> <STRONG>y,</STRONG> <STRONG>int</STRONG> <STRONG>x);</STRONG>
60 <STRONG>chtype</STRONG> <STRONG>mvwinch(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>int</STRONG> <STRONG>y,</STRONG> <STRONG>int</STRONG> <STRONG>x);</STRONG>
63 </PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
64 These routines return the character, of type <STRONG>chtype</STRONG>, at the current
65 position in the named window. If any attributes are set for that posi-
66 tion, their values are OR'ed into the value returned. Constants
67 defined in <STRONG><curses.h></STRONG> can be used with the <STRONG>&</STRONG> (logical AND) operator to
68 extract the character or attributes alone.
71 </PRE><H3><a name="h3-Attributes">Attributes</a></H3><PRE>
72 The following bit-masks may be AND-ed with characters returned by
73 <STRONG>winch</STRONG>.
75 <STRONG>A_CHARTEXT</STRONG> Bit-mask to extract character
76 <STRONG>A_ATTRIBUTES</STRONG> Bit-mask to extract attributes
77 <STRONG>A_COLOR</STRONG> Bit-mask to extract color-pair field information
80 </PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
81 Functions with a "mv" prefix first perform a cursor movement using
82 <STRONG>wmove</STRONG>, and return an error if the position is outside the window, or if
83 the window pointer is null.
85 The <STRONG>winch</STRONG> function does not return an error if the window contains
86 characters larger than 8-bits (255). Only the low-order 8 bits of the
87 character are used by <STRONG>winch</STRONG>.
90 </PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
91 Note that all of these routines may be macros.
94 </PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
95 These functions are described in the XSI Curses standard, Issue 4.
97 Very old systems (before standardization) provide a different function
100 <STRONG>o</STRONG> The <STRONG>winch</STRONG> function was part of the original BSD curses library,
101 which stored a 7-bit character combined with the <EM>standout</EM>
104 In BSD curses, <STRONG>winch</STRONG> returned only the character (as an integer)
105 with the <EM>standout</EM> attribute removed.
107 <STRONG>o</STRONG> System V curses added support for several video attributes which
108 could be combined with characters in the window.
110 Reflecting this improvement, the function was altered to return the
111 character combined with all video attributes in a <STRONG>chtype</STRONG> value.
113 X/Open Curses does not specify the size and layout of attributes, color
114 and character values in <STRONG>chtype</STRONG>; it is implementation-dependent. This
115 implementation uses 8 bits for character values. An application using
116 more bits, e.g., a Unicode value, should use the wide-character equiva-
117 lents to these functions.
120 </PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
121 <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>
122 gives an overview of the WINDOW and <STRONG>chtype</STRONG> data types.
124 <STRONG><A HREF="curs_attr.3x.html">curs_attr(3x)</A></STRONG>
125 goes into more detail, pointing out portability problems and con-
126 straints on the use of <STRONG>chtype</STRONG> for returning window information.
128 <STRONG><A HREF="curs_in_wch.3x.html">curs_in_wch(3x)</A></STRONG>
129 describes comparable functions for the wide-character (ncursesw)
134 <STRONG><A HREF="curs_inch.3x.html">curs_inch(3x)</A></STRONG>
138 <li><a href="#h2-NAME">NAME</a></li>
139 <li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
140 <li><a href="#h2-DESCRIPTION">DESCRIPTION</a>
142 <li><a href="#h3-Attributes">Attributes</a></li>
145 <li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
146 <li><a href="#h2-NOTES">NOTES</a></li>
147 <li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
148 <li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>