define_key - define a keycode
#include <ncurses/curses.h>
int define_key(const char *definition, int
keycode);
This is an extension to the curses library. It permits an application to define
keycodes with their corresponding control strings, so that the ncurses library
will interpret them just as it would the predefined codes in the terminfo
database.
If the given string is null, any existing definition for the
keycode is removed. Similarly, if the given keycode is negative or zero, any
existing string for the given definition is removed.
The keycode must be greater than zero, and the string non-null, otherwise
ERR is returned. ERR may also be returned if there is
insufficient memory to allocate the data to store the definition. If no error
is detected, OK 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.