freebsd-dev/usr.sbin/xntpd/lib/decodenetnum.c

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/*
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* decodenetnum - return a net number (this is crude, but careful)
*/
#include <sys/types.h>
#include <ctype.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include "ntp_stdlib.h"
int
decodenetnum(num, netnum)
const char *num;
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u_long *netnum;
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{
register const char *cp;
register char *bp;
register int i;
register int temp;
register int eos;
char buf[80]; /* will core dump on really stupid stuff */
cp = num;
*netnum = 0;
if (*cp == '[') {
eos = ']';
cp++;
} else {
eos = '\0';
}
for (i = 0; i < 4; i++) {
bp = buf;
while (isdigit(*cp))
*bp++ = *cp++;
if (bp == buf)
break;
if (i < 3) {
if (*cp++ != '.')
break;
} else if (*cp != eos)
break;
*bp = '\0';
temp = atoi(buf);
if (temp > 255)
break;
*netnum <<= 8;
*netnum += temp;
}
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if (i < 4)
return 0;
*netnum = htonl(*netnum);
return 1;
}