1 /* 2 * Copyright (c) 1983 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #if defined(LIBC_SCCS) && !defined(lint) 9 static char sccsid[] = "@(#)inet_network.c 5.8 (Berkeley) 02/24/91"; 10 #endif /* LIBC_SCCS and not lint */ 11 12 #include <sys/types.h> 13 #include <netinet/in.h> 14 #include <arpa/inet.h> 15 #include <ctype.h> 16 17 /* 18 * Internet network address interpretation routine. 19 * The library routines call this routine to interpret 20 * network numbers. 21 */ 22 u_long 23 inet_network(cp) 24 register const char *cp; 25 { 26 register u_long val, base, n; 27 register char c; 28 u_long parts[4], *pp = parts; 29 register int i; 30 31 again: 32 val = 0; base = 10; 33 if (*cp == '0') 34 base = 8, cp++; 35 if (*cp == 'x' || *cp == 'X') 36 base = 16, cp++; 37 while (c = *cp) { 38 if (isdigit(c)) { 39 val = (val * base) + (c - '0'); 40 cp++; 41 continue; 42 } 43 if (base == 16 && isxdigit(c)) { 44 val = (val << 4) + (c + 10 - (islower(c) ? 'a' : 'A')); 45 cp++; 46 continue; 47 } 48 break; 49 } 50 if (*cp == '.') { 51 if (pp >= parts + 4) 52 return (INADDR_NONE); 53 *pp++ = val, cp++; 54 goto again; 55 } 56 if (*cp && !isspace(*cp)) 57 return (INADDR_NONE); 58 *pp++ = val; 59 n = pp - parts; 60 if (n > 4) 61 return (INADDR_NONE); 62 for (val = 0, i = 0; i < n; i++) { 63 val <<= 8; 64 val |= parts[i] & 0xff; 65 } 66 return (val); 67 } 68