decodenetnum.c revision 54359 
1/*
2 * decodenetnum - return a net number (this is crude, but careful)
3 */
4#include <sys/types.h>
5#include <ctype.h>
6#include <sys/socket.h>
7#include <netinet/in.h>
8
9#include "ntp_stdlib.h"
10
11int
12decodenetnum(
13	const char *num,
14	u_int32 *netnum
15	)
16{
17	register const char *cp;
18	register char *bp;
19	register int i;
20	register int temp;
21	register int eos;
22	char buf[80];		/* will core dump on really stupid stuff */
23
24	cp = num;
25	*netnum = 0;
26
27	if (*cp == '[') {
28		eos = ']';
29		cp++;
30	} else {
31		eos = '\0';
32	}
33
34	for (i = 0; i < 4; i++) {
35		bp = buf;
36		while (isdigit((int)*cp))
37		    *bp++ = *cp++;
38		if (bp == buf)
39		    break;
40
41		if (i < 3) {
42			if (*cp++ != '.')
43			    break;
44		} else if (*cp != eos)
45		    break;
46
47		*bp = '\0';
48		temp = atoi(buf);
49		if (temp > 255)
50		    break;
51		*netnum <<= 8;
52		*netnum += temp;
53	}
54
55	if (i < 4)
56	    return 0;
57	*netnum = htonl(*netnum);
58	return 1;
59}
60