Commit | Line | Data |
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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) |
95f51977 | 8 | static char sccsid[] = "@(#)inet_addr.c 5.2 (Berkeley) 3/9/86"; |
2ce81398 | 9 | #endif LIBC_SCCS and not lint |
5e649950 SL |
10 | |
11 | #include <sys/types.h> | |
12 | #include <ctype.h> | |
056d5bbd | 13 | #include <netinet/in.h> |
5e649950 | 14 | |
ff79189c SL |
15 | /* |
16 | * Internet address interpretation routine. | |
17 | * All the network library routines call this | |
18 | * routine to interpret entries in the data bases | |
19 | * which are expected to be an address. | |
d6c70669 | 20 | * The value returned is in network order. |
ff79189c | 21 | */ |
b2053919 | 22 | u_long |
ff79189c SL |
23 | inet_addr(cp) |
24 | register char *cp; | |
25 | { | |
d6c70669 | 26 | register u_long val, base, n; |
ff79189c | 27 | register char c; |
d6c70669 | 28 | u_long parts[4], *pp = parts; |
ff79189c SL |
29 | |
30 | again: | |
d6c70669 SL |
31 | /* |
32 | * Collect number up to ``.''. | |
33 | * Values are specified as for C: | |
34 | * 0x=hex, 0=octal, other=decimal. | |
35 | */ | |
ff79189c SL |
36 | val = 0; base = 10; |
37 | if (*cp == '0') | |
38 | base = 8, cp++; | |
39 | if (*cp == 'x' || *cp == 'X') | |
40 | base = 16, cp++; | |
41 | while (c = *cp) { | |
42 | if (isdigit(c)) { | |
43 | val = (val * base) + (c - '0'); | |
44 | cp++; | |
45 | continue; | |
46 | } | |
47 | if (base == 16 && isxdigit(c)) { | |
48 | val = (val << 4) + (c + 10 - (islower(c) ? 'a' : 'A')); | |
49 | cp++; | |
50 | continue; | |
51 | } | |
52 | break; | |
53 | } | |
54 | if (*cp == '.') { | |
55 | /* | |
56 | * Internet format: | |
57 | * a.b.c.d | |
58 | * a.b.c (with c treated as 16-bits) | |
59 | * a.b (with b treated as 24 bits) | |
60 | */ | |
61 | if (pp >= parts + 4) | |
62 | return (-1); | |
63 | *pp++ = val, cp++; | |
64 | goto again; | |
65 | } | |
d6c70669 SL |
66 | /* |
67 | * Check for trailing characters. | |
68 | */ | |
ff79189c SL |
69 | if (*cp && !isspace(*cp)) |
70 | return (-1); | |
d6c70669 SL |
71 | *pp++ = val; |
72 | /* | |
73 | * Concoct the address according to | |
74 | * the number of parts specified. | |
75 | */ | |
ff79189c | 76 | n = pp - parts; |
d6c70669 SL |
77 | switch (n) { |
78 | ||
79 | case 1: /* a -- 32 bits */ | |
ff79189c | 80 | val = parts[0]; |
d6c70669 SL |
81 | break; |
82 | ||
83 | case 2: /* a.b -- 8.24 bits */ | |
84 | val = (parts[0] << 24) | (parts[1] & 0xffffff); | |
85 | break; | |
86 | ||
87 | case 3: /* a.b.c -- 8.8.16 bits */ | |
88 | val = (parts[0] << 24) | ((parts[1] & 0xff) << 16) | | |
89 | (parts[2] & 0xffff); | |
90 | break; | |
91 | ||
92 | case 4: /* a.b.c.d -- 8.8.8.8 bits */ | |
93 | val = (parts[0] << 24) | ((parts[1] & 0xff) << 16) | | |
94 | ((parts[2] & 0xff) << 8) | (parts[3] & 0xff); | |
95 | break; | |
96 | ||
97 | default: | |
98 | return (-1); | |
ff79189c | 99 | } |
d6c70669 | 100 | val = htonl(val); |
ff79189c SL |
101 | return (val); |
102 | } |