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31 * @Id: curs_inch.3x,v 1.52 2024/05/11 20:39:53 tom Exp @
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38 <TITLE>curs_inch 3x 2024-05-11 ncurses 6.5 Library calls</TITLE>
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43 <H1 class="no-header">curs_inch 3x 2024-05-11 ncurses 6.5 Library calls</H1>
45 <STRONG><A HREF="curs_inch.3x.html">curs_inch(3x)</A></STRONG> Library calls <STRONG><A HREF="curs_inch.3x.html">curs_inch(3x)</A></STRONG>
50 </PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
51 <STRONG>inch</STRONG>, <STRONG>winch</STRONG>, <STRONG>mvinch</STRONG>, <STRONG>mvwinch</STRONG> - get a <EM>curses</EM> character from a 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>*</STRONG><EM>win</EM><STRONG>);</STRONG>
59 <STRONG>chtype</STRONG> <STRONG>mvinch(int</STRONG> <EM>y</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>x</EM><STRONG>);</STRONG>
60 <STRONG>chtype</STRONG> <STRONG>mvwinch(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>y</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>x</EM><STRONG>);</STRONG>
63 </PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
64 <STRONG>winch</STRONG> returns the <EM>curses</EM> character, including rendering attributes and
65 color pair identifier, at the cursor position in the window <EM>win</EM>.
66 Subsection "Video Attributes" of <STRONG><A HREF="curs_attr.3x.html">attron(3x)</A></STRONG> explains how to extract
67 these data from a <EM>chtype</EM>. <STRONG><A HREF="ncurses.3x.html">ncurses(3x)</A></STRONG> describes the variants of this
71 </PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
72 Functions prefixed with "mv" first perform cursor movement and fail if
73 the position (<EM>y</EM>, <EM>x</EM>) is outside the window boundaries.
75 These functions do not return an error if the window comprises cells of
76 <EM>curses</EM> complex characters (that is, they contain characters with codes
77 wider than eight bits, or greater than 255 as an unsigned decimal
78 integer). They instead extract only the low-order eight bits of
79 character data in the cell.
82 </PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
83 <STRONG>inch</STRONG>, <STRONG>mvinch</STRONG>, and <STRONG>mvwinch</STRONG> may be implemented as macros.
86 </PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
87 X/Open Curses, Issue 4 describes these functions. It specifies no
88 error conditions for them.
91 </PRE><H2><a name="h2-HISTORY">HISTORY</a></H2><PRE>
92 <STRONG>winch</STRONG> was implemented in the original 4BSD <EM>curses</EM> library (November
93 1980). It returned only the character code (as an integer) with the
94 "standout" attribute bit (the only one it supported) cleared. Because
95 7-bit ASCII was the only character encoding supported, 4BSD's <STRONG>winch</STRONG>
96 returned a <EM>char</EM> type.
98 System V <EM>curses</EM> (1983) permitted several rendering attributes to be
99 combined with a character in a window. Reflecting this improvement,
100 <STRONG>winch</STRONG> returned an <EM>int</EM> in SVr3.2 (1988) and switched to <EM>chtype</EM> in SVr4
103 X/Open Curses does not specify the sizes of the character code or color
104 pair identifier, nor the quantity of rendering attribute bits, in
105 <EM>chtype</EM>; these are implementation-dependent. <EM>ncurses</EM> uses eight bits
106 for the character code. An application requiring a wider character
107 type, for instance to handle Unicode, should use the wide-character
108 counterparts of these functions.
111 </PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
112 <STRONG><A HREF="curs_in_wch.3x.html">curs_in_wch(3x)</A></STRONG> describes comparable functions of the <EM>ncurses</EM> library
113 in its wide-character configuration (<EM>ncursesw</EM>).
115 <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="curs_instr.3x.html">curs_instr(3x)</A></STRONG>
119 ncurses 6.5 2024-05-11 <STRONG><A HREF="curs_inch.3x.html">curs_inch(3x)</A></STRONG>
123 <li><a href="#h2-NAME">NAME</a></li>
124 <li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
125 <li><a href="#h2-DESCRIPTION">DESCRIPTION</a></li>
126 <li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
127 <li><a href="#h2-NOTES">NOTES</a></li>
128 <li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
129 <li><a href="#h2-HISTORY">HISTORY</a></li>
130 <li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>