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. 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.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 #if defined(LIBC_SCCS) && !defined(lint)
36 static char sccsid
[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93";
37 #endif /* LIBC_SCCS and not lint */
42 /* Include for MinGW only. Cygwin will have the latter. */
45 #include <sys/param.h>
46 #include <netinet/in.h>
47 #include <arpa/inet.h>
53 * Ascii internet address interpretation routine.
54 * The value returned is in network order.
57 inet_addr(const char *cp
)
61 if (inet_aton(cp
, &val
))
68 /* We provide this prototype to avoid compiler warnings. If this ever
69 conflicts with a declaration in a system header file, we'll find
70 out, because we should include that header file here. */
71 int inet_aton (const char *cp
, struct in_addr
*addr
);
74 * Check whether "cp" is a valid ascii representation
75 * of an Internet address and convert to a binary address.
76 * Returns 1 if the address is valid, 0 if not.
77 * This replaces inet_addr, the return value from which
78 * cannot distinguish between failure and a local broadcast address. */
80 inet_aton(const char *cp_arg
, struct in_addr
*addr
)
82 register unsigned long val
;
84 register unsigned char c
;
85 register unsigned const char *cp
= (unsigned const char *) cp_arg
;
86 unsigned int parts
[4];
87 register unsigned int *pp
= parts
;
91 * Collect number up to ``.''.
92 * Values are specified as for C:
93 * 0x=hex, 0=octal, other=decimal.
97 if (*++cp
== 'x' || *cp
== 'X')
102 while ((c
= *cp
) != '\0') {
103 if (isascii(c
) && isdigit(c
)) {
104 val
= (val
* base
) + (c
- '0');
108 if (base
== 16 && isascii(c
) && isxdigit(c
)) {
110 (c
+ 10 - (islower(c
) ? 'a' : 'A'));
120 * a.b.c (with c treated as 16-bits)
121 * a.b (with b treated as 24 bits)
123 if (pp
>= parts
+ 3 || val
> 0xff)
130 * Check for trailing characters.
132 if (*cp
&& (!isascii(*cp
) || !isspace(*cp
)))
135 * Concoct the address according to
136 * the number of parts specified.
141 case 1: /* a -- 32 bits */
144 case 2: /* a.b -- 8.24 bits */
147 val
|= parts
[0] << 24;
150 case 3: /* a.b.c -- 8.8.16 bits */
153 val
|= (parts
[0] << 24) | (parts
[1] << 16);
156 case 4: /* a.b.c.d -- 8.8.8.8 bits */
159 val
|= (parts
[0] << 24) | (parts
[1] << 16) | (parts
[2] << 8);
163 addr
->s_addr
= htonl(val
);