/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ /* posix */#include <sys/types.h>#include <unistd.h>#include <stdlib.h>#include <string.h> /* bsd extensions */#include <sys/uio.h>#include <sys/socket.h>#include <netinet/in.h> #define CLASS(x)	(x[0]>>6) unsigned longinet_addr(char *from){	int i;	char *p;	unsigned char to[4];	unsigned long x; 	p = from;	memset(to, 0, 4);	for(i = 0; i < 4 && *p; i++){		to[i] = strtoul(p, &p, 0);		if(*p == '.')			p++;	} 	switch(CLASS(to)){	case 0:	/* class A - 1 byte net */	case 1:		if(i == 3){			to[3] = to[2];			to[2] = to[1];			to[1] = 0;		} else if (i == 2){			to[3] = to[1];			to[1] = 0;		}		break;	case 2:	/* class B - 2 byte net */		if(i == 3){			to[3] = to[2];			to[2] = 0;		}		break;	}	x = nptohl(to);	x = htonl(x);	return x;}