表驱动状态机！

#include "stdio.h"
typedef enum { idel, running, stopped } state_t;
typedef enum { start, stop, reset } event_t;

state_t current_state = idel;

void start_running(event_t  event)
{
    (void)event;
    printf("Start running\n");
}

void stop_running(event_t  event)
{
    (void)event;
    printf("Stop running\n");
}

void reset_stopped(event_t  event)
{
    (void)event;
    printf("Reset stopped\n");
}


typedef struct {
    state_t state;
    event_t event;
    state_t next_state;
    void (*func)(event_t  event);
} state_machine_t;

state_machine_t state_machine[] = {
    {idel, start, running, start_running},
    {running, stop, stopped, stop_running},
    {stopped, reset, idel, reset_stopped}
};

void process_event(event_t event)
{
    for (long long unsigned int i = 0; i < sizeof(state_machine) / sizeof(state_machine_t); i++) {
        if (state_machine[i].state == current_state && state_machine[i].event == event) {
            current_state = state_machine[i].next_state;
            if (state_machine[i].func) {
                state_machine[i].func(event);
                return;
            }
        }
    }
    printf("Invalid event\n");
}



int main(void)
{
    process_event(start);
    getchar();
    process_event(stop);
    getchar();
    process_event(reset);
    getchar();
    return 0;
}

表驱动状态机，要点：

1，回调函数！

2，查表！

-----看过网上其它文章生成的状态机。