#include <kernwin.hpp> // For get_screen_ea() definition
#include <funcs.hpp>

// Get the address of the user's cursor
ea_t addr = get_screen_ea();
func_t *func = get_func(addr);

if (func != NULL)
    msg("Current function starts at %a\n", func->startEA);
else
    msg("Not inside a function!\n");