key_defined(3X)key_defined(3X)NAMEkey_defined - check if a keycode is defined
int key_defined(const char *definition);
This is an extension to the curses library. It permits an application
to determine if a string is currently bound to any keycode.
If the string is bound to a keycode, its value (greater than zero) is
returned. If no keycode is bound, zero is returned. If the string
conflicts with longer strings which are bound to keys, -1 is returned.
These routines are specific to ncurses. They were not supported on
Version 7, BSD or System V implementations. It is recommended that any
code depending on them be conditioned using NCURSES_VERSION.