24 lines
565 B
C
24 lines
565 B
C
#if !defined(lint) && defined(SCCSIDS)
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static char sccsid[] = "@(#)inet_netof.c 1.1 92/07/30 SMI"; /* from UCB 4.3 82/11/14 */
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#endif
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#include <sys/types.h>
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#include <netinet/in.h>
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/*
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* Return the network number from an internet
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* address; handles class a/b/c network #'s.
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*/
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inet_netof(in)
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struct in_addr in;
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{
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register u_long i = ntohl(in.s_addr);
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if (IN_CLASSA(i))
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return (((i)&IN_CLASSA_NET) >> IN_CLASSA_NSHIFT);
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else if (IN_CLASSB(i))
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return (((i)&IN_CLASSB_NET) >> IN_CLASSB_NSHIFT);
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else
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return (((i)&IN_CLASSC_NET) >> IN_CLASSC_NSHIFT);
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}
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