curs_inch(3x) — Linux manual page


curs_inch(3X)                                              curs_inch(3X)

NAME         top

       inch, winch, mvinch, mvwinch - get a character and attributes
       from a curses window

SYNOPSIS         top

       #include <curses.h>

       chtype inch(void);
       chtype winch(WINDOW *win);

       chtype mvinch(int y, int x);
       chtype mvwinch(WINDOW *win, int y, int x);

DESCRIPTION         top

       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

       The following bit-masks may be AND-ed with characters returned by
       A_CHARTEXT     Bit-mask to extract character
       A_ATTRIBUTES   Bit-mask to extract attributes
       A_COLOR        Bit-mask to extract color-pair field information

RETURN VALUE         top

       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.

NOTES         top

       Note that all of these routines may be macros.

PORTABILITY         top

       These functions are described in the XSI Curses standard, Issue

       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.

SEE ALSO         top

            gives an overview of the WINDOW and chtype data types.

            goes into more detail, pointing out portability problems and
            constraints on the use of chtype for returning window

            describes comparable functions for the wide-character
            (ncursesw) library.

COLOPHON         top

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