Commit | Line | Data |
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48a5c215 | 1 | /* @(#)inet_network.c 4.2 %G% */ |
a03c8308 SL |
2 | |
3 | #include <sys/types.h> | |
4 | #include <ctype.h> | |
5 | ||
6 | /* | |
7 | * Internet network address interpretation routine. | |
8 | * The library routines call this routine to interpret | |
9 | * network numbers. | |
10 | */ | |
11 | u_long | |
12 | inet_network(cp) | |
13 | register char *cp; | |
14 | { | |
15 | register u_long val, base, n; | |
16 | register char c; | |
17 | u_long parts[4], *pp = parts; | |
48a5c215 | 18 | register int i; |
a03c8308 SL |
19 | |
20 | again: | |
21 | val = 0; base = 10; | |
22 | if (*cp == '0') | |
23 | base = 8, cp++; | |
24 | if (*cp == 'x' || *cp == 'X') | |
25 | base = 16, cp++; | |
26 | while (c = *cp) { | |
27 | if (isdigit(c)) { | |
28 | val = (val * base) + (c - '0'); | |
29 | cp++; | |
30 | continue; | |
31 | } | |
32 | if (base == 16 && isxdigit(c)) { | |
33 | val = (val << 4) + (c + 10 - (islower(c) ? 'a' : 'A')); | |
34 | cp++; | |
35 | continue; | |
36 | } | |
37 | break; | |
38 | } | |
39 | if (*cp == '.') { | |
40 | if (pp >= parts + 4) | |
41 | return (-1); | |
42 | *pp++ = val, cp++; | |
43 | goto again; | |
44 | } | |
45 | if (*cp && !isspace(*cp)) | |
46 | return (-1); | |
47 | *pp++ = val; | |
48 | n = pp - parts; | |
49 | if (n > 4) | |
50 | return (-1); | |
51 | for (val = 0, i = 0; i < n; i++) { | |
52 | val <<= 8; | |
53 | val |= parts[i] & 0xff; | |
54 | } | |
55 | return (val); | |
56 | } |