/*
 * =====================================================================================
 *
 *       Filename:  state.c
 *
 *    Description:
 *
 *        Version:  1.0
 *        Created:  2017年08月08日 08时48分35秒
 *  Last Modified:  2021-02-07 14:10:13
 *       Revision:  none
 *       Compiler:  gcc
 *
 *         Author:  zt (),
 *   Organization:
 *
 * =====================================================================================
 */

#include <stdio.h>

typedef unsigned char State;
typedef State ( *Procedure ) ( void* );

enum states
{
    s_init,
    s_count,
    s_done,
    s_default,
};

typedef struct
{
    int cnt;
} SM_VAR;

State step_init ( void* arg )
{
    SM_VAR* p = ( SM_VAR* ) arg;
    p->cnt = 0;
    printf ( "CS:init; cnt=%d; NS:count\n", p->cnt );
    return s_count;
}

State step_count ( void* arg )
{
    SM_VAR* p = ( SM_VAR* ) arg;

    if ( p->cnt < 3 )
    {
        p->cnt += 1;
        printf ( "CS:count; cnt=%d; NS:count\n", p->cnt );
        return s_count;
    }
    else
    {
        printf ( "CS:count; cnt=%d; NS:done\n", p->cnt );
        return s_done;
    }
}

State step_done ( void* arg )
{
    SM_VAR* p = ( SM_VAR* ) arg;
    printf ( "CS:init; cnt=%d; NS:init\n", p->cnt );
    return s_init;
}

State step_default ( void* arg )
{
    ( void ) arg;
    //SM_VAR* p = ( SM_VAR* ) arg;
    printf ( "Wrong State\n" );
    return s_init;
}

Procedure Steps[] =
{
    step_init,
    step_count,
    step_done,
    step_default,
};

void BestStateMachine ( void* invar )
{
    static State NS = s_init;
    NS = Steps[NS] ( invar );
}

int main ( int argc, char* argv[] )
{
    ( void ) argc;
    ( void ) argv;

    SM_VAR var;

    int i;

    for ( i = 0 ; i < 8; ++i )
    {
        BestStateMachine ( &var );
    }

    return 0;
}