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 #if defined(LIBC_SCCS) && !defined(lint) 8 static char sccsid[] = "@(#)inet_network.c 5.2 (Berkeley) 03/09/86"; 9 #endif LIBC_SCCS and not lint 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; 26 register int i; 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 } 65