121367Sdist /* 221367Sdist * Copyright (c) 1983 Regents of the University of California. 321367Sdist * All rights reserved. The Berkeley software License Agreement 421367Sdist * specifies the terms and conditions for redistribution. 521367Sdist */ 68324Ssam 7*26612Sdonn #if defined(LIBC_SCCS) && !defined(lint) 8*26612Sdonn static char sccsid[] = "@(#)inet_addr.c 5.2 (Berkeley) 03/09/86"; 9*26612Sdonn #endif LIBC_SCCS and not lint 1021367Sdist 118324Ssam #include <sys/types.h> 128324Ssam #include <ctype.h> 139192Ssam #include <netinet/in.h> 148324Ssam 158309Ssam /* 168309Ssam * Internet address interpretation routine. 178309Ssam * All the network library routines call this 188309Ssam * routine to interpret entries in the data bases 198309Ssam * which are expected to be an address. 208357Ssam * The value returned is in network order. 218309Ssam */ 228361Ssam u_long 238309Ssam inet_addr(cp) 248309Ssam register char *cp; 258309Ssam { 268357Ssam register u_long val, base, n; 278309Ssam register char c; 288357Ssam u_long parts[4], *pp = parts; 298309Ssam 308309Ssam again: 318357Ssam /* 328357Ssam * Collect number up to ``.''. 338357Ssam * Values are specified as for C: 348357Ssam * 0x=hex, 0=octal, other=decimal. 358357Ssam */ 368309Ssam val = 0; base = 10; 378309Ssam if (*cp == '0') 388309Ssam base = 8, cp++; 398309Ssam if (*cp == 'x' || *cp == 'X') 408309Ssam base = 16, cp++; 418309Ssam while (c = *cp) { 428309Ssam if (isdigit(c)) { 438309Ssam val = (val * base) + (c - '0'); 448309Ssam cp++; 458309Ssam continue; 468309Ssam } 478309Ssam if (base == 16 && isxdigit(c)) { 488309Ssam val = (val << 4) + (c + 10 - (islower(c) ? 'a' : 'A')); 498309Ssam cp++; 508309Ssam continue; 518309Ssam } 528309Ssam break; 538309Ssam } 548309Ssam if (*cp == '.') { 558309Ssam /* 568309Ssam * Internet format: 578309Ssam * a.b.c.d 588309Ssam * a.b.c (with c treated as 16-bits) 598309Ssam * a.b (with b treated as 24 bits) 608309Ssam */ 618309Ssam if (pp >= parts + 4) 628309Ssam return (-1); 638309Ssam *pp++ = val, cp++; 648309Ssam goto again; 658309Ssam } 668357Ssam /* 678357Ssam * Check for trailing characters. 688357Ssam */ 698309Ssam if (*cp && !isspace(*cp)) 708309Ssam return (-1); 718357Ssam *pp++ = val; 728357Ssam /* 738357Ssam * Concoct the address according to 748357Ssam * the number of parts specified. 758357Ssam */ 768309Ssam n = pp - parts; 778357Ssam switch (n) { 788357Ssam 798357Ssam case 1: /* a -- 32 bits */ 808309Ssam val = parts[0]; 818357Ssam break; 828357Ssam 838357Ssam case 2: /* a.b -- 8.24 bits */ 848357Ssam val = (parts[0] << 24) | (parts[1] & 0xffffff); 858357Ssam break; 868357Ssam 878357Ssam case 3: /* a.b.c -- 8.8.16 bits */ 888357Ssam val = (parts[0] << 24) | ((parts[1] & 0xff) << 16) | 898357Ssam (parts[2] & 0xffff); 908357Ssam break; 918357Ssam 928357Ssam case 4: /* a.b.c.d -- 8.8.8.8 bits */ 938357Ssam val = (parts[0] << 24) | ((parts[1] & 0xff) << 16) | 948357Ssam ((parts[2] & 0xff) << 8) | (parts[3] & 0xff); 958357Ssam break; 968357Ssam 978357Ssam default: 988357Ssam return (-1); 998309Ssam } 1008357Ssam val = htonl(val); 1018309Ssam return (val); 1028309Ssam } 103