inet_network.c revision 156956 
1/*
2 * Copyright (c) 1983, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
20 *
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
31 * SUCH DAMAGE.
32 */
33
34#if defined(LIBC_SCCS) && !defined(lint)
35static const char sccsid[] = "@(#)inet_network.c	8.1 (Berkeley) 6/4/93";
36#endif /* LIBC_SCCS and not lint */
37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD: head/lib/libc/inet/inet_network.c 156956 2006-03-21 15:37:16Z ume $");
39
40#include "port_before.h"
41
42#include <sys/types.h>
43#include <netinet/in.h>
44#include <arpa/inet.h>
45#include <ctype.h>
46
47#include "port_after.h"
48
49/*
50 * Internet network address interpretation routine.
51 * The library routines call this routine to interpret
52 * network numbers.
53 */
54in_addr_t
55inet_network(cp)
56	const char *cp;
57{
58	in_addr_t val, base, n;
59	char c;
60	in_addr_t parts[4], *pp = parts;
61	int i, digit;
62
63again:
64	val = 0; base = 10; digit = 0;
65	if (*cp == '0')
66		digit = 1, base = 8, cp++;
67	if (*cp == 'x' || *cp == 'X')
68		base = 16, cp++;
69	while ((c = *cp) != 0) {
70		if (isdigit((unsigned char)c)) {
71			if (base == 8U && (c == '8' || c == '9'))
72				return (INADDR_NONE);
73			val = (val * base) + (c - '0');
74			cp++;
75			digit = 1;
76			continue;
77		}
78		if (base == 16U && isxdigit((unsigned char)c)) {
79			val = (val << 4) +
80			      (c + 10 - (islower((unsigned char)c) ? 'a' : 'A'));
81			cp++;
82			digit = 1;
83			continue;
84		}
85		break;
86	}
87	if (!digit)
88		return (INADDR_NONE);
89	if (*cp == '.') {
90		if (pp >= parts + 4 || val > 0xffU)
91			return (INADDR_NONE);
92		*pp++ = val, cp++;
93		goto again;
94	}
95	if (*cp && !isspace(*cp&0xff))
96		return (INADDR_NONE);
97	*pp++ = val;
98	n = pp - parts;
99	if (n > 4U)
100		return (INADDR_NONE);
101	for (val = 0, i = 0; i < n; i++) {
102		val <<= 8;
103		val |= parts[i] & 0xff;
104	}
105	return (val);
106}
107
108/*
109 * Weak aliases for applications that use certain private entry points,
110 * and fail to include <arpa/inet.h>.
111 */
112#undef inet_network
113__weak_reference(__inet_network, inet_network);
114