I got some point from others.I already red and debug network.c . Now I now
the basic logic behind that. But still I'm confused by arithmetic. I find
some comments on that , I need some one's help.

 * int
 * bitncmp(l, r, n)
 * compare bit masks l and r, for n bits.
 * return:
 * -1, 1, or 0 in the libc tradition.
 * note:
 * network byte order assumed.  this means has
 * 0x11110000 in its fourth octet.
 * author:
 * Paul Vixie (ISC), June 1996

Why we finish it in this way. Can you help me?

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