The getyx macro places the current cursor position of the given
window in the two integer variables y and x.
If win is a subwindow, the getparyx macro places the beginning
coordinates of the subwindow relative to the parent window into two
integer variables y and x. Otherwise, -1 is placed into y and x.
Like getyx, the getbegyx and getmaxyx macros store the current
beginning coordinates and size of the specified window.
The getyx, getparyx, getbegyx and getmaxyx macros are described in
the XSI Curses standard, Issue 4.
This implementation also provides functions getbegx, getbegy,
getcurx, getcury, getmaxx, getmaxy, getparx and getpary for
compatibility with older versions of curses.
Although X/Open Curses does not address this, many implementations
provide members of the WINDOW structure containing values
corresponding to these macros. For best portability, do not rely on
using the data in WINDOW, since some implementations make WINDOW
opaque (do not allow direct use of its members).
Besides the problem of opaque structures, the data stored in like-
named members may not have like-values in different implementations.
For example, the WINDOW._maxx and WINDOW._maxy values in ncurses have
(at least since release 1.8.1) differed by one from some other
implementations. The difference is hidden by means of the macro
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