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Annotation of embedaddon/dhcp/omapip/inet_addr.c, revision 1.1

1.1     ! misho       1: /*     $NetBSD: inet_addr.c,v 1.6 1996/02/02 15:22:23 mrg Exp $        */
        !             2: 
        !             3: /*
        !             4:  * Copyright (c) 1983, 1990, 1993
        !             5:  *     The Regents of the University of California.  All rights reserved.
        !             6:  *
        !             7:  * Redistribution and use in source and binary forms, with or without
        !             8:  * modification, are permitted provided that the following conditions
        !             9:  * are met:
        !            10:  * 1. Redistributions of source code must retain the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer.
        !            12:  * 2. Redistributions in binary form must reproduce the above copyright
        !            13:  *    notice, this list of conditions and the following disclaimer in the
        !            14:  *    documentation and/or other materials provided with the distribution.
        !            15:  * 3. All advertising materials mentioning features or use of this software
        !            16:  *    must display the following acknowledgement:
        !            17:  *     This product includes software developed by the University of
        !            18:  *     California, Berkeley and its contributors.
        !            19:  * 4. Neither the name of the University nor the names of its contributors
        !            20:  *    may be used to endorse or promote products derived from this software
        !            21:  *    without specific prior written permission.
        !            22:  *
        !            23:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            24:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            25:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            26:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            27:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            28:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            29:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            33:  * SUCH DAMAGE.
        !            34:  */
        !            35: 
        !            36: #if defined(LIBC_SCCS) && !defined(lint)
        !            37: #if 0
        !            38: static char sccsid[] = "@(#)inet_addr.c        8.1 (Berkeley) 6/17/93";
        !            39: #else
        !            40: static char rcsid[] = "$NetBSD: inet_addr.c,v 1.6 1996/02/02 15:22:23 mrg Exp $";
        !            41: #endif
        !            42: #endif /* LIBC_SCCS and not lint */
        !            43: 
        !            44: #include "dhcpd.h"
        !            45: 
        !            46: #include "omapip/omapip_p.h"
        !            47: 
        !            48: #ifdef NEED_INET_ATON
        !            49: /* 
        !            50:  * Check whether "cp" is a valid ascii representation
        !            51:  * of an Internet address and convert to a binary address.
        !            52:  * Returns 1 if the address is valid, 0 if not.
        !            53:  * This replaces inet_addr, the return value from which
        !            54:  * cannot distinguish between failure and a local broadcast address.
        !            55:  */
        !            56: int
        !            57: inet_aton(cp, addr)
        !            58:        const char *cp;
        !            59:        struct in_addr *addr;
        !            60: {
        !            61:        register u_long val;
        !            62:        register int base, n;
        !            63:        register char c;
        !            64:        u_int parts[4];
        !            65:        register u_int *pp = parts;
        !            66: 
        !            67:        for (;;) {
        !            68:                /*
        !            69:                 * Collect number up to ``.''.
        !            70:                 * Values are specified as for C:
        !            71:                 * 0x=hex, 0=octal, other=decimal.
        !            72:                 */
        !            73:                val = 0; base = 10;
        !            74:                if (*cp == '0') {
        !            75:                        if (*++cp == 'x' || *cp == 'X')
        !            76:                                base = 16, cp++;
        !            77:                        else
        !            78:                                base = 8;
        !            79:                }
        !            80:                while ((c = *cp) != '\0') {
        !            81:                        if (isascii(c) && isdigit((int)c)) {
        !            82:                                val = (val * base) + (c - '0');
        !            83:                                cp++;
        !            84:                                continue;
        !            85:                        }
        !            86:                        if (base == 16 && isascii(c) && isxdigit((int)c)) {
        !            87:                                val = (val << 4) + 
        !            88:                                      (c + 10 - (islower((int)c) ? 'a' : 'A'));
        !            89:                                cp++;
        !            90:                                continue;
        !            91:                        }
        !            92:                        break;
        !            93:                }
        !            94:                if (*cp == '.') {
        !            95:                        /*
        !            96:                         * Internet format:
        !            97:                         *      a.b.c.d
        !            98:                         *      a.b.c   (with c treated as 16-bits)
        !            99:                         *      a.b     (with b treated as 24 bits)
        !           100:                         */
        !           101:                        if (pp >= parts + 3 || val > 0xff)
        !           102:                                return (0);
        !           103:                        *pp++ = val, cp++;
        !           104:                } else
        !           105:                        break;
        !           106:        }
        !           107:        /*
        !           108:         * Check for trailing characters.
        !           109:         */
        !           110:        if (*cp && (!isascii(*cp) || !isspace((int)*cp)))
        !           111:                return (0);
        !           112:        /*
        !           113:         * Concoct the address according to
        !           114:         * the number of parts specified.
        !           115:         */
        !           116:        n = pp - parts + 1;
        !           117:        switch (n) {
        !           118: 
        !           119:        case 0:
        !           120:                return (0);             /* initial nondigit */
        !           121: 
        !           122:        case 1:                         /* a -- 32 bits */
        !           123:                break;
        !           124: 
        !           125:        case 2:                         /* a.b -- 8.24 bits */
        !           126:                if (val > 0xffffff)
        !           127:                        return (0);
        !           128:                val |= parts[0] << 24;
        !           129:                break;
        !           130: 
        !           131:        case 3:                         /* a.b.c -- 8.8.16 bits */
        !           132:                if (val > 0xffff)
        !           133:                        return (0);
        !           134:                val |= (parts[0] << 24) | (parts[1] << 16);
        !           135:                break;
        !           136: 
        !           137:        case 4:                         /* a.b.c.d -- 8.8.8.8 bits */
        !           138:                if (val > 0xff)
        !           139:                        return (0);
        !           140:                val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
        !           141:                break;
        !           142:        }
        !           143:        if (addr)
        !           144:                addr->s_addr = htonl(val);
        !           145:        return (1);
        !           146: }
        !           147: #endif