width.i4.v = menu_bar_min_width_c(field_text.i1a.r)

	This routine will calculate the minimum width of a menu bar
	which contains the indicated text.

	field_text	null terminated string containing the menu bar
			field labels separated by back slashes

	This function returns status values as follows:

	CBS_INVARG		null pointer, null string, or blank string
	otherwise		minimum width if the specified menu bar

	This function requires the following include files:

	cbslib_h, acnet_errors_h

	Related functions:

	window_menu_bar_create_c, menu_bar_create, window_menu_bar_delete_c,
	window_menu_bar_update_c, window_read_menu_bar_info, menu_bar_enable_c,
	menu_bar_disable_c, menu_bar_field_coordinates_c,
	menu_bar_upcase_entry_c, menu_bar_dncase_entry_c,
	menu_bar_change_entry_c, window_has_menu_bar_c, build_menu_bar_text

	C/C++ usage:

	static const char	field_text[] = "field 1\\field 2";
	int	width;

	width = menu_bar_min_width_c(field_text);