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 5.6 (Berkeley) 06/01/90"; 10 #endif /* LIBC_SCCS and not lint */ 11 12 #include <sys/types.h> 13 #include <netinet/in.h> 14 #include <ctype.h> 15 16 /* 17 * Internet network address interpretation routine. 18 * The library routines call this routine to interpret 19 * network numbers. 20 */ 21 u_long 22 inet_network(cp) 23 register char *cp; 24 { 25 register u_long val, base, n; 26 register char c; 27 u_long parts[4], *pp = parts; 28 register int i; 29 30 again: 31 val = 0; base = 10; 32 if (*cp == '0') 33 base = 8, cp++; 34 if (*cp == 'x' || *cp == 'X') 35 base = 16, cp++; 36 while (c = *cp) { 37 if (isdigit(c)) { 38 val = (val * base) + (c - '0'); 39 cp++; 40 continue; 41 } 42 if (base == 16 && isxdigit(c)) { 43 val = (val << 4) + (c + 10 - (islower(c) ? 'a' : 'A')); 44 cp++; 45 continue; 46 } 47 break; 48 } 49 if (*cp == '.') { 50 if (pp >= parts + 4) 51 return (INADDR_NONE); 52 *pp++ = val, cp++; 53 goto again; 54 } 55 if (*cp && !isspace(*cp)) 56 return (INADDR_NONE); 57 *pp++ = val; 58 n = pp - parts; 59 if (n > 4) 60 return (INADDR_NONE); 61 for (val = 0, i = 0; i < n; i++) { 62 val <<= 8; 63 val |= parts[i] & 0xff; 64 } 65 return (val); 66 } 67