blob: 9d96d2521fc61b66806c9a201f17a4ceb04d38ed (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
/* Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
*/
#include "ctype.h"
#include "types.h"
#include "in.h"
/* TCP_INETADDR -- Internet address interpretation routine. Decode a network
* address from the host name table. The value returned is in network order.
*/
u_long
tcp_inetaddr (cp)
register char *cp;
{
register u_long val, base, n;
register char c;
u_long parts[4], *pp = parts;
again:
/* Collect number up to ``.''.
* Values are specified as for C:
* 0x=hex, 0=octal, other=decimal.
*/
val = 0; base = 10;
if (*cp == '0')
base = 8, cp++;
if (*cp == 'x' || *cp == 'X')
base = 16, cp++;
while (c = *cp) {
if (isdigit(c)) {
val = (val * base) + (c - '0');
cp++;
continue;
}
if (base == 16 && isxdigit(c)) {
val = (val << 4) + (c + 10 - (islower(c) ? 'a' : 'A'));
cp++;
continue;
}
break;
}
if (*cp == '.') {
/* Internet format:
* a.b.c.d
* a.b.c (with c treated as 16-bits)
* a.b (with b treated as 24 bits)
*/
if (pp >= parts + 4)
return (-1);
*pp++ = val, cp++;
goto again;
}
/* Check for trailing characters.
*/
if (*cp && !isspace(*cp))
return (-1);
*pp++ = val;
/* Concoct the address according to
* the number of parts specified.
*/
n = pp - parts;
switch (n) {
case 1: /* a -- 32 bits */
val = parts[0];
break;
case 2: /* a.b -- 8.24 bits */
val = (parts[0] << 24) | (parts[1] & 0xffffff);
break;
case 3: /* a.b.c -- 8.8.16 bits */
val = (parts[0] << 24) | ((parts[1] & 0xff) << 16) |
(parts[2] & 0xffff);
break;
case 4: /* a.b.c.d -- 8.8.8.8 bits */
val = (parts[0] << 24) | ((parts[1] & 0xff) << 16) |
((parts[2] & 0xff) << 8) | (parts[3] & 0xff);
break;
default:
return (-1);
}
val = htonl(val);
return (val);
}
|
