2 * Copyright (c) 1983, 1990, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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32 #if defined(LIBC_SCCS) && !defined(lint)
33 static char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93";
34 #endif /* LIBC_SCCS and not lint */
36 #ifdef HAVE_SYS_PARAM_H
37 #include <sys/param.h>
40 #ifdef HAVE_NETINET_IN_H
41 #include <netinet/in.h>
44 #ifdef HAVE_WINSOCK2_H
48 #ifdef HAVE_ARPA_INET_H
49 #include <arpa/inet.h>
52 #include "inet_aton.h"
55 * Check whether "cp" is a valid ascii representation
56 * of an Internet address and convert to a binary address.
57 * Returns 1 if the address is valid, 0 if not.
58 * This replaces inet_addr, the return value from which
59 * cannot distinguish between failure and a local broadcast address.
62 inet_aton(cp_arg, addr)
66 register const u_char *cp = cp_arg;
72 register u_int *pp = parts;
76 * Collect number up to ``.''.
77 * Values are specified as for C:
78 * 0x=hex, 0=octal, other=decimal.
82 if (*++cp == 'x' || *cp == 'X')
87 while ((c = *cp) != '\0') {
88 if (isascii(c) && isdigit(c)) {
89 val = (val * base) + (c - '0');
93 if (base == 16 && isascii(c) && isxdigit(c)) {
95 (c + 10 - (islower(c) ? 'a' : 'A'));
105 * a.b.c (with c treated as 16-bits)
106 * a.b (with b treated as 24 bits)
108 if (pp >= parts + 3 || val > 0xff)
115 * Check for trailing characters.
117 if (*cp && (!isascii(*cp) || !isspace(*cp)))
120 * Concoct the address according to
121 * the number of parts specified.
126 case 1: /* a -- 32 bits */
129 case 2: /* a.b -- 8.24 bits */
132 val |= parts[0] << 24;
135 case 3: /* a.b.c -- 8.8.16 bits */
138 val |= (parts[0] << 24) | (parts[1] << 16);
141 case 4: /* a.b.c.d -- 8.8.8.8 bits */
144 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
148 addr->s_addr = htonl(val);
153 * Editor modelines - http://www.wireshark.org/tools/modelines.html
158 * indent-tabs-mode: t
161 * vi: set shiftwidth=8 tabstop=8 noexpandtab:
162 * :indentSize=8:tabSize=8:noTabs=false: