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/* posix */
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#include <sys/types.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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/* bsd extensions */
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#include <sys/uio.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#define CLASS(x)	(x[0]>>6)
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unsigned long
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inet_addr(char *from)
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{
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	int i;
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	char *p;
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	unsigned char to[4];
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	unsigned long x;
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	p = from;
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	memset(to, 0, 4);
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	for(i = 0; i < 4 && *p; i++){
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		to[i] = strtoul(p, &p, 0);
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		if(*p == '.')
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			p++;
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	}
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	switch(CLASS(to)){
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	case 0:	/* class A - 1 byte net */
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	case 1:
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		if(i == 3){
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			to[3] = to[2];
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			to[2] = to[1];
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			to[1] = 0;
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		} else if (i == 2){
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			to[3] = to[1];
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			to[1] = 0;
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		}
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		break;
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	case 2:	/* class B - 2 byte net */
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		if(i == 3){
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			to[3] = to[2];
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			to[2] = 0;
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		}
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		break;
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	}
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	x = nptohl(to);
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	x = htonl(x);
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	return x;
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}