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
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9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
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12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
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38 #if defined(LIBC_SCCS) && !defined(lint)
39 static char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93";
40 #endif /* LIBC_SCCS and not lint */
42 #ifdef HAVE_SYS_PARAM_H
43 #include <sys/param.h>
46 #ifdef HAVE_NETINET_IN_H
47 #include <netinet/in.h>
54 #ifdef HAVE_ARPA_INET_H
55 #include <arpa/inet.h>
61 * Check whether "cp" is a valid ascii representation
62 * of an Internet address and convert to a binary address.
63 * Returns 1 if the address is valid, 0 if not.
64 * This replaces inet_addr, the return value from which
65 * cannot distinguish between failure and a local broadcast address.
68 inet_aton(cp_arg, addr)
72 register const u_char *cp = cp_arg;
77 register u_int *pp = parts;
81 * Collect number up to ``.''.
82 * Values are specified as for C:
83 * 0x=hex, 0=octal, other=decimal.
87 if (*++cp == 'x' || *cp == 'X')
92 while ((c = *cp) != '\0') {
93 if (isascii(c) && isdigit(c)) {
94 val = (val * base) + (c - '0');
98 if (base == 16 && isascii(c) && isxdigit(c)) {
100 (c + 10 - (islower(c) ? 'a' : 'A'));
110 * a.b.c (with c treated as 16-bits)
111 * a.b (with b treated as 24 bits)
113 if (pp >= parts + 3 || val > 0xff)
120 * Check for trailing characters.
122 if (*cp && (!isascii(*cp) || !isspace(*cp)))
125 * Concoct the address according to
126 * the number of parts specified.
131 case 1: /* a -- 32 bits */
134 case 2: /* a.b -- 8.24 bits */
137 val |= parts[0] << 24;
140 case 3: /* a.b.c -- 8.8.16 bits */
143 val |= (parts[0] << 24) | (parts[1] << 16);
146 case 4: /* a.b.c.d -- 8.8.8.8 bits */
149 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
153 addr->s_addr = htonl(val);