* Copyright (c) 1983, 1990 Regents of the University of California.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid
[] = "@(#)inet_addr.c 5.10 (Berkeley) 2/24/91";
#endif /* LIBC_SCCS and not lint */
* Ascii internet address interpretation routine.
* The value returned is in network order.
* Check whether "cp" is a valid ascii representation
* of an Internet address and convert to a binary address.
* Returns 1 if the address is valid, 0 if not.
* This replaces inet_addr, the return value from which
* cannot distinguish between failure and a local broadcast address.
register u_long val
, base
, n
;
u_long parts
[4], *pp
= parts
;
* Collect number up to ``.''.
* Values are specified as for C:
* 0x=hex, 0=octal, other=decimal.
if (*++cp
== 'x' || *cp
== 'X')
while ((c
= *cp
) != '\0') {
if (isascii(c
) && isdigit(c
)) {
val
= (val
* base
) + (c
- '0');
if (base
== 16 && isascii(c
) && isxdigit(c
)) {
(c
+ 10 - (islower(c
) ? 'a' : 'A'));
* a.b.c (with c treated as 16-bits)
* a.b (with b treated as 24 bits)
if (pp
>= parts
+ 3 || val
> 0xff)
* Check for trailing characters.
if (*cp
&& (!isascii(*cp
) || !isspace(*cp
)))
* Concoct the address according to
* the number of parts specified.
case 1: /* a -- 32 bits */
case 2: /* a.b -- 8.24 bits */
case 3: /* a.b.c -- 8.8.16 bits */
val
|= (parts
[0] << 24) | (parts
[1] << 16);
case 4: /* a.b.c.d -- 8.8.8.8 bits */
val
|= (parts
[0] << 24) | (parts
[1] << 16) | (parts
[2] << 8);
addr
->s_addr
= htonl(val
);