state_machine.h

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#ifndef STATE_MACHINE_H
#define STATE_MACHINE_H
 
typedef void (*StateCallback)(void);
 
typedef struct
{
    StateCallback on_init;
    StateCallback on_update;
    StateCallback on_exit;
} StateInfo;
 
typedef struct
{
    StateCallback active_update;
 
    StateInfo* state_infos;
 
    unsigned int num_infos;
 
    int state;
 
    bool registered;
} StateMachine;
 
void state_machine_register(StateMachine* state_machine);
 
void state_machine_remove(StateMachine* state_machine);
 
void state_machine_update(void);
 
void state_machine_change_state(StateMachine* state_machine, int new_state);
 
void noop(void);
 
// clang-format off
#define STATE_INFO_UPDATE_FN_ONLY(fn)                 {.on_init = noop,    .on_update = fn,        .on_exit = noop}
#define STATE_INFO_INIT_UPDATE_FN(init_fn, update_fn) {.on_init = init_fn, .on_update = update_fn, .on_exit = noop}
#define STATE_MACHINE_DEFINE(infos, num) \
{                                        \
    .state_infos = &infos[0],            \
    .num_infos = num,                    \
    .registered = false,                 \
};
// clang-format on
 
#endif // STATE_MACHINE_H