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SGI Freeware 1998 November
/
Freeware November 1998.img
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dist
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fw_UDELxntp.idb
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usr
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freeware
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src
/
xntp-3.4o-export
/
lib
/
numtohost.c.z
/
numtohost.c
Wrap
C/C++ Source or Header
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1998-01-21
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859b
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39 lines
/*
* numtohost - convert network number to host name.
*/
#include <netdb.h>
#include "ntp_fp.h"
#include "ntp_stdlib.h"
#include "lib_strbuf.h"
#define LOOPBACKNET 0x7f000000
#define LOOPBACKHOST 0x7f000001
#define LOOPBACKNETMASK 0xff000000
char *
numtohost(netnum)
u_int32 netnum;
{
char *bp;
struct hostent *hp;
/*
* This is really gross, but saves lots of hanging looking for
* hostnames for the radio clocks. Don't bother looking up
* addresses on the loopback network except for the loopback
* host itself.
*/
if ((((ntohl(netnum) & LOOPBACKNETMASK) == LOOPBACKNET)
&& (ntohl(netnum) != LOOPBACKHOST))
|| ((hp = gethostbyaddr((char *)&netnum, sizeof netnum, AF_INET))
== 0))
return numtoa(netnum);
LIB_GETBUF(bp);
bp[LIB_BUFLENGTH-1] = '\0';
(void) strncpy(bp, hp->h_name, LIB_BUFLENGTH-1);
return bp;
}