关于atoi转换“”

int atoi_test(char argc,char **argv)
{
    rt_kprintf("argv[1] (%s) : %d\n", argv[1], atoi(argv[1]));
    return RT_EOK;
}
MSH_CMD_EXPORT(atoi_test,atoi test);

int atoi_test(char argc,char **argv)
{
    rt_kprintf("argv[1] : %s , atoi(argv[1]) = %d\n",argv[1],atoi(argv[1]));
    return RT_EOK;
}
MSH_CMD_EXPORT(atoi_test,atoi test);

msh />atoi_test 8
argv[1] : 8 , atoi(argv[1]) = 0
msh />atoi_test 1
argv[1] : 1 , atoi(argv[1]) = 1
msh />atoi_test 123
argv[1] : 123 , atoi(argv[1]) = 123
msh />atoi_test 658
argv[1] : 658 , atoi(argv[1]) = 0