projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 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 | ||
| 7 | #ifndef lint | |
| 8 | static char sccsid[] = "@(#)inet_network.c 5.1 (Berkeley) %G%"; | |
| 9 | #endif not lint | |
| a03c8308 SL |
10 | |
| 11 | #include <sys/types.h> | |
| 12 | #include <ctype.h> | |
| 13 | ||
| 14 | /* | |
| 15 | * Internet network address interpretation routine. | |
| 16 | * The library routines call this routine to interpret | |
| 17 | * network numbers. | |
| 18 | */ | |
| 19 | u_long | |
| 20 | inet_network(cp) | |
| 21 | register char *cp; | |
| 22 | { | |
| 23 | register u_long val, base, n; | |
| 24 | register char c; | |
| 25 | u_long parts[4], *pp = parts; | |
| 48a5c215 | 26 | register int i; |
| a03c8308 SL |
27 | |
| 28 | again: | |
| 29 | val = 0; base = 10; | |
| 30 | if (*cp == '0') | |
| 31 | base = 8, cp++; | |
| 32 | if (*cp == 'x' || *cp == 'X') | |
| 33 | base = 16, cp++; | |
| 34 | while (c = *cp) { | |
| 35 | if (isdigit(c)) { | |
| 36 | val = (val * base) + (c - '0'); | |
| 37 | cp++; | |
| 38 | continue; | |
| 39 | } | |
| 40 | if (base == 16 && isxdigit(c)) { | |
| 41 | val = (val << 4) + (c + 10 - (islower(c) ? 'a' : 'A')); | |
| 42 | cp++; | |
| 43 | continue; | |
| 44 | } | |
| 45 | break; | |
| 46 | } | |
| 47 | if (*cp == '.') { | |
| 48 | if (pp >= parts + 4) | |
| 49 | return (-1); | |
| 50 | *pp++ = val, cp++; | |
| 51 | goto again; | |
| 52 | } | |
| 53 | if (*cp && !isspace(*cp)) | |
| 54 | return (-1); | |
| 55 | *pp++ = val; | |
| 56 | n = pp - parts; | |
| 57 | if (n > 4) | |
| 58 | return (-1); | |
| 59 | for (val = 0, i = 0; i < n; i++) { | |
| 60 | val <<= 8; | |
| 61 | val |= parts[i] & 0xff; | |
| 62 | } | |
| 63 | return (val); | |
| 64 | } |