https://invisible-island.net/ncurses/man/
mitem_current(3x) Library calls mitem_current(3x)
mitem_current - set and get current_menu_item
#include <menu.h>
int set_current_item(MENU *menu, ITEM *item);
ITEM *current_item(const MENU *menu);
int set_top_row(MENU *menu, int row);
int top_row(const MENU *menu);
int item_index(const ITEM *item);
The function set_current_item sets the current item (the item on which
the menu cursor is positioned). current_item returns a pointer to the
current item in the given menu.
The function set_top_row sets the top row of the menu to show the given
row (the top row is initially 0, and is reset to this value whenever
the O_ROWMAJOR option is toggled). The item leftmost on the given row
becomes current. The function top_row returns the number of the top
menu row being displayed.
The function item_index returns the (zero-origin) index of item in the
menu's item pointer list.
current_item returns a pointer (which may be NULL). It does not set
errno.
top_row and item_index return ERR (the general curses error value) if
their menu parameter is NULL.
set_current_item and set_top_row return one of the following:
E_OK The routine succeeded.
E_BAD_ARGUMENT
Routine detected an incorrect or out-of-range argument.
E_BAD_STATE
Routine was called from an initialization or termination function.
E_NOT_CONNECTED
No items are connected to the menu.
E_SYSTEM_ERROR
System error occurred (see errno(3)).
These routines emulate the System V menu library. They were not
supported on Version 7 or BSD versions.
The SVr4 menu library documentation specifies the top_row and
index_item error value as -1 (which is the value of ERR).
Juergen Pfeifer. Manual pages and adaptation for new curses by Eric S.
Raymond.
curses(3x), menu(3x)
ncurses 6.5 2024-03-16 mitem_current(3x)