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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | PORTABILITY | SEE ALSO | COLOPHON |
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curs_inch(3X) curs_inch(3X)
inch, winch, mvinch, mvwinch - get a character and attributes
from a curses window
#include <curses.h>
chtype inch(void);
chtype winch(WINDOW *win);
chtype mvinch(int y, int x);
chtype mvwinch(WINDOW *win, int y, int x);
These routines return the character, of type chtype, 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 <curses.h> can be used with the &
(logical AND) operator to extract the character or attributes
alone.
Attributes
The following bit-masks may be AND-ed with characters returned by
winch.
A_CHARTEXT Bit-mask to extract character
A_ATTRIBUTES Bit-mask to extract attributes
A_COLOR Bit-mask to extract color-pair field information
Functions with a “mv” prefix first perform a cursor movement
using wmove, and return an error if the position is outside the
window, or if the window pointer is null.
The winch 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 winch.
Note that all of these routines may be macros.
These functions are described in the XSI Curses standard, Issue
4.
Very old systems (before standardization) provide a different
function with the same name:
• The winch function was part of the original BSD curses
library, which stored a 7-bit character combined with the
standout attribute.
In BSD curses, winch returned only the character (as an
integer) with the standout attribute removed.
• 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
chtype value.
X/Open Curses does not specify the size and layout of attributes,
color and character values in chtype; 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 equivalents to these functions.
curses(3X)
gives an overview of the WINDOW and chtype data types.
curs_attr(3X)
goes into more detail, pointing out portability problems and
constraints on the use of chtype for returning window
information.
curs_in_wch(3X)
describes comparable functions for the wide-character
(ncursesw) library.
This page is part of the ncurses (new curses) project.
Information about the project can be found at
⟨https://www.gnu.org/software/ncurses/ncurses.html⟩. If you have
a bug report for this manual page, send it to
bug-ncurses-request@gnu.org. This page was obtained from the
project's upstream Git mirror of the CVS repository
⟨https://github.com/mirror/ncurses.git⟩ on 2024-06-14. (At that
time, the date of the most recent commit that was found in the
repository was 2023-03-12.) If you discover any rendering
problems in this HTML version of the page, or you believe there
is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
curs_inch(3X)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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