1curs_inch(3X)                                                    curs_inch(3X)
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3
4

NAME

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

10       #include <curses.h>
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12       chtype inch(void);
13       chtype winch(WINDOW *win);
14       chtype mvinch(int y, int x);
15       chtype mvwinch(WINDOW *win, int y, int x);
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DESCRIPTION

18       These routines return the character, of type  chtype,  at  the  current
19       position in the named window.  If any attributes are set for that posi‐
20       tion, their values  are  OR'ed  into  the  value  returned.   Constants
21       defined  in <curses.h> can be used with the & (logical AND) operator to
22       extract the character or attributes alone.
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24   Attributes
25       The following bit-masks may  be  AND-ed  with  characters  returned  by
26       winch.
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28       A_CHARTEXT     Bit-mask to extract character
29       A_ATTRIBUTES   Bit-mask to extract attributes
30       A_COLOR        Bit-mask to extract color-pair field information
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RETURN VALUE

33       Functions  with  a  “mv”  prefix  first perform a cursor movement using
34       wmove, and return an error if the position is outside the window, or if
35       the window pointer is null.
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37       The  winch  function  does  not  return an error if the window contains
38       characters larger than 8-bits (255).  Only the low-order 8 bits of  the
39       character are used by winch.
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NOTES

42       Note that all of these routines may be macros.
43

PORTABILITY

45       These functions are described in the XSI Curses standard, Issue 4.
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47       Very  old systems (before standardization) provide a different function
48       with the same name:
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50       ·   The winch function was part of the  original  BSD  curses  library,
51           which   stored   a  7-bit  character  combined  with  the  standout
52           attribute.
53
54           In BSD curses, winch returned only the character  (as  an  integer)
55           with the standout attribute removed.
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57       ·   System  V  curses  added support for several video attributes which
58           could be combined with characters in the window.
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60           Reflecting this improvement, the function was altered to return the
61           character combined with all video attributes in a chtype value.
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63       X/Open Curses does not specify the size and layout of attributes, color
64       and character values in chtype; it is  implementation-dependent.   This
65       implementation  uses 8 bits for character values.  An application using
66       more bits, e.g., a Unicode value, should use the wide-character equiva‐
67       lents to these functions.
68

SEE ALSO

70       curses(3X)
71            gives an overview of the WINDOW and chtype data types.
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73       curs_attr(3X)
74            goes  into more detail, pointing out portability problems and con‐
75            straints on the use of chtype for returning window information.
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77       curs_in_wch(3X)
78            describes comparable functions for the  wide-character  (ncursesw)
79            library.
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83                                                                 curs_inch(3X)
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