projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| ff79189c SL |
1 | /* inet_addr.c 4.1 82/10/05 */ |
| 2 | /* | |
| 3 | * Internet address interpretation routine. | |
| 4 | * All the network library routines call this | |
| 5 | * routine to interpret entries in the data bases | |
| 6 | * which are expected to be an address. | |
| 7 | */ | |
| 8 | u_long | |
| 9 | inet_addr(cp) | |
| 10 | register char *cp; | |
| 11 | { | |
| 12 | register unsigned long val, base, n; | |
| 13 | register char c; | |
| 14 | unsigned long parts[4], *pp = parts; | |
| 15 | ||
| 16 | again: | |
| 17 | val = 0; base = 10; | |
| 18 | if (*cp == '0') | |
| 19 | base = 8, cp++; | |
| 20 | if (*cp == 'x' || *cp == 'X') | |
| 21 | base = 16, cp++; | |
| 22 | while (c = *cp) { | |
| 23 | if (isdigit(c)) { | |
| 24 | val = (val * base) + (c - '0'); | |
| 25 | cp++; | |
| 26 | continue; | |
| 27 | } | |
| 28 | if (base == 16 && isxdigit(c)) { | |
| 29 | val = (val << 4) + (c + 10 - (islower(c) ? 'a' : 'A')); | |
| 30 | cp++; | |
| 31 | continue; | |
| 32 | } | |
| 33 | break; | |
| 34 | } | |
| 35 | if (*cp == '.') { | |
| 36 | /* | |
| 37 | * Internet format: | |
| 38 | * a.b.c.d | |
| 39 | * a.b.c (with c treated as 16-bits) | |
| 40 | * a.b (with b treated as 24 bits) | |
| 41 | */ | |
| 42 | if (pp >= parts + 4) | |
| 43 | return (-1); | |
| 44 | *pp++ = val, cp++; | |
| 45 | goto again; | |
| 46 | } | |
| 47 | if (*cp && !isspace(*cp)) | |
| 48 | return (-1); | |
| 49 | n = pp - parts; | |
| 50 | if (n > 0) { | |
| 51 | if (n > 4) | |
| 52 | return (-1); | |
| 53 | *pp++ = val; n++; | |
| 54 | val = parts[0]; | |
| 55 | if (n > 1) | |
| 56 | val <<= 24; | |
| 57 | if (n > 2) | |
| 58 | val |= (parts[1] & 0xff) << 16; | |
| 59 | if (n > 3) | |
| 60 | val |= (parts[2] & 0xff) << 8; | |
| 61 | if (n > 1) | |
| 62 | val |= parts[n - 1]; | |
| 63 | #if vax || pdp11 | |
| 64 | val = htonl(val); | |
| 65 | #endif | |
| 66 | } | |
| 67 | return (val); | |
| 68 | } | |
| 69 |