Trace fdisk source in busybox 心得

When you use "fdisk /dev/sda", fdisk will set disk_device(this is an global) to "/dev/sda".
Then into the main loop.
If you enter "n" it will call new_partition().
The key point of new_partition() is add_partition(index, type);
The size is set in the read_int() of add_partition()