[HACKERS] arithmetic about inet
in [PgSql]
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From: fanng yuan on 7 Mar 2010 20:47 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 192.5.5.240/28 has * 0x11110000 in its fourth octet. * author: * Paul Vixie (ISC), June 1996 */ Why we finish it in this way. Can you help me? |