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 5.3 (Berkeley) 10/01/87"; 9 #endif LIBC_SCCS and not lint 10 11 #include <sys/types.h> 12 #include <netinet/in.h> 13 #include <ctype.h> 14 15 /* 16 * Internet network address interpretation routine. 17 * The library routines call this routine to interpret 18 * network numbers. 19 */ 20 u_long 21 inet_network(cp) 22 register char *cp; 23 { 24 register u_long val, base, n; 25 register char c; 26 u_long parts[4], *pp = parts; 27 register int i; 28 29 again: 30 val = 0; base = 10; 31 if (*cp == '0') 32 base = 8, cp++; 33 if (*cp == 'x' || *cp == 'X') 34 base = 16, cp++; 35 while (c = *cp) { 36 if (isdigit(c)) { 37 val = (val * base) + (c - '0'); 38 cp++; 39 continue; 40 } 41 if (base == 16 && isxdigit(c)) { 42 val = (val << 4) + (c + 10 - (islower(c) ? 'a' : 'A')); 43 cp++; 44 continue; 45 } 46 break; 47 } 48 if (*cp == '.') { 49 if (pp >= parts + 4) 50 return (INADDR_NONE); 51 *pp++ = val, cp++; 52 goto again; 53 } 54 if (*cp && !isspace(*cp)) 55 return (INADDR_NONE); 56 *pp++ = val; 57 n = pp - parts; 58 if (n > 4) 59 return (INADDR_NONE); 60 for (val = 0, i = 0; i < n; i++) { 61 val <<= 8; 62 val |= parts[i] & 0xff; 63 } 64 return (val); 65 } 66