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bb0cfa24 DF |
1 | /* |
2 | * Copyright (c) 1983 Regents of the University of California. | |
3 | * All rights reserved. The Berkeley software License Agreement | |
4 | * specifies the terms and conditions for redistribution. | |
5 | */ | |
6 | ||
2ce81398 | 7 | #if defined(LIBC_SCCS) && !defined(lint) |
a02e9915 | 8 | static char sccsid[] = "@(#)inet_network.c 5.3 (Berkeley) %G%"; |
2ce81398 | 9 | #endif LIBC_SCCS and not lint |
a03c8308 SL |
10 | |
11 | #include <sys/types.h> | |
a02e9915 | 12 | #include <netinet/in.h> |
a03c8308 SL |
13 | #include <ctype.h> |
14 | ||
15 | /* | |
16 | * Internet network address interpretation routine. | |
17 | * The library routines call this routine to interpret | |
18 | * network numbers. | |
19 | */ | |
20 | u_long | |
21 | inet_network(cp) | |
22 | register char *cp; | |
23 | { | |
24 | register u_long val, base, n; | |
25 | register char c; | |
26 | u_long parts[4], *pp = parts; | |
48a5c215 | 27 | register int i; |
a03c8308 SL |
28 | |
29 | again: | |
30 | val = 0; base = 10; | |
31 | if (*cp == '0') | |
32 | base = 8, cp++; | |
33 | if (*cp == 'x' || *cp == 'X') | |
34 | base = 16, cp++; | |
35 | while (c = *cp) { | |
36 | if (isdigit(c)) { | |
37 | val = (val * base) + (c - '0'); | |
38 | cp++; | |
39 | continue; | |
40 | } | |
41 | if (base == 16 && isxdigit(c)) { | |
42 | val = (val << 4) + (c + 10 - (islower(c) ? 'a' : 'A')); | |
43 | cp++; | |
44 | continue; | |
45 | } | |
46 | break; | |
47 | } | |
48 | if (*cp == '.') { | |
49 | if (pp >= parts + 4) | |
a02e9915 | 50 | return (INADDR_NONE); |
a03c8308 SL |
51 | *pp++ = val, cp++; |
52 | goto again; | |
53 | } | |
54 | if (*cp && !isspace(*cp)) | |
a02e9915 | 55 | return (INADDR_NONE); |
a03c8308 SL |
56 | *pp++ = val; |
57 | n = pp - parts; | |
58 | if (n > 4) | |
a02e9915 | 59 | return (INADDR_NONE); |
a03c8308 SL |
60 | for (val = 0, i = 0; i < n; i++) { |
61 | val <<= 8; | |
62 | val |= parts[i] & 0xff; | |
63 | } | |
64 | return (val); | |
65 | } |