Return to inet_addr.c CVS log

Up to [CSRG BSD Unix] / 43BSDTahoe / lib / libc / inet

Annotation of 43BSDTahoe/lib/libc/inet/inet_addr.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  */
        !            17: 
        !            18: #if defined(LIBC_SCCS) && !defined(lint)
        !            19: static char sccsid[] = "@(#)inet_addr.c        5.6 (Berkeley) 6/27/88";
        !            20: #endif /* LIBC_SCCS and not lint */
        !            21: 
        !            22: #include <sys/types.h>
        !            23: #include <ctype.h>
        !            24: #include <netinet/in.h>
        !            25: 
        !            26: /*
        !            27:  * Internet address interpretation routine.
        !            28:  * All the network library routines call this
        !            29:  * routine to interpret entries in the data bases
        !            30:  * which are expected to be an address.
        !            31:  * The value returned is in network order.
        !            32:  */
        !            33: u_long
        !            34: inet_addr(cp)
        !            35:        register char *cp;
        !            36: {
        !            37:        register u_long val, base, n;
        !            38:        register char c;
        !            39:        u_long parts[4], *pp = parts;
        !            40: 
        !            41: again:
        !            42:        /*
        !            43:         * Collect number up to ``.''.
        !            44:         * Values are specified as for C:
        !            45:         * 0x=hex, 0=octal, other=decimal.
        !            46:         */
        !            47:        val = 0; base = 10;
        !            48:        if (*cp == '0') {
        !            49:                if (*++cp == 'x' || *cp == 'X')
        !            50:                        base = 16, cp++;
        !            51:                else
        !            52:                        base = 8;
        !            53:        }
        !            54:        while (c = *cp) {
        !            55:                if (isdigit(c)) {
        !            56:                        val = (val * base) + (c - '0');
        !            57:                        cp++;
        !            58:                        continue;
        !            59:                }
        !            60:                if (base == 16 && isxdigit(c)) {
        !            61:                        val = (val << 4) + (c + 10 - (islower(c) ? 'a' : 'A'));
        !            62:                        cp++;
        !            63:                        continue;
        !            64:                }
        !            65:                break;
        !            66:        }
        !            67:        if (*cp == '.') {
        !            68:                /*
        !            69:                 * Internet format:
        !            70:                 *      a.b.c.d
        !            71:                 *      a.b.c   (with c treated as 16-bits)
        !            72:                 *      a.b     (with b treated as 24 bits)
        !            73:                 */
        !            74:                if (pp >= parts + 4)
        !            75:                        return (INADDR_NONE);
        !            76:                *pp++ = val, cp++;
        !            77:                goto again;
        !            78:        }
        !            79:        /*
        !            80:         * Check for trailing characters.
        !            81:         */
        !            82:        if (*cp && !isspace(*cp))
        !            83:                return (INADDR_NONE);
        !            84:        *pp++ = val;
        !            85:        /*
        !            86:         * Concoct the address according to
        !            87:         * the number of parts specified.
        !            88:         */
        !            89:        n = pp - parts;
        !            90:        switch (n) {
        !            91: 
        !            92:        case 1:                         /* a -- 32 bits */
        !            93:                val = parts[0];
        !            94:                break;
        !            95: 
        !            96:        case 2:                         /* a.b -- 8.24 bits */
        !            97:                val = (parts[0] << 24) | (parts[1] & 0xffffff);
        !            98:                break;
        !            99: 
        !           100:        case 3:                         /* a.b.c -- 8.8.16 bits */
        !           101:                val = (parts[0] << 24) | ((parts[1] & 0xff) << 16) |
        !           102:                        (parts[2] & 0xffff);
        !           103:                break;
        !           104: 
        !           105:        case 4:                         /* a.b.c.d -- 8.8.8.8 bits */
        !           106:                val = (parts[0] << 24) | ((parts[1] & 0xff) << 16) |
        !           107:                      ((parts[2] & 0xff) << 8) | (parts[3] & 0xff);
        !           108:                break;
        !           109: 
        !           110:        default:
        !           111:                return (INADDR_NONE);
        !           112:        }
        !           113:        val = htonl(val);
        !           114:        return (val);
        !           115: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.