Function inject_print_handler

src/fl/stl/cstdio.cpp.hpp:244–246

Inject function handlers for testing

// Inject function handlers for testing
void inject_print_handler(const print_handler_t& handler) {
    get_print_handler() = handler;
}

void inject_println_handler(const println_handler_t& handler) {
    get_println_handler() = handler;