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 * 4. 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.
16 *
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
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#if defined(LIBC_SCCS) && !defined(lint)
31static const char sccsid[] = "@(#)inet_network.c	8.1 (Berkeley) 6/4/93";
32#endif /* LIBC_SCCS and not lint */
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD$");
35
36#include "port_before.h"
37
38#include <sys/types.h>
39#include <netinet/in.h>
40#include <arpa/inet.h>
41#include <ctype.h>
42
43#include "port_after.h"
44
45/*%
46 * Internet network address interpretation routine.
47 * The library routines call this routine to interpret
48 * network numbers.
49 */
50in_addr_t
51inet_network(const char *cp)
52{
53	in_addr_t val, base, n;
54	char c;
55	in_addr_t parts[4], *pp = parts;
56	int i, digit;
57
58again:
59	val = 0; base = 10; digit = 0;
60	if (*cp == '0')
61		digit = 1, base = 8, cp++;
62	if (*cp == 'x' || *cp == 'X')
63		base = 16, cp++;
64	while ((c = *cp) != 0) {
65		if (isdigit((unsigned char)c)) {
66			if (base == 8U && (c == '8' || c == '9'))
67				return (INADDR_NONE);
68			val = (val * base) + (c - '0');
69			cp++;
70			digit = 1;
71			continue;
72		}
73		if (base == 16U && isxdigit((unsigned char)c)) {
74			val = (val << 4) +
75			      (c + 10 - (islower((unsigned char)c) ? 'a' : 'A'));
76			cp++;
77			digit = 1;
78			continue;
79		}
80		break;
81	}
82	if (!digit)
83		return (INADDR_NONE);
84	if (pp >= parts + 4 || val > 0xffU)
85		return (INADDR_NONE);
86	if (*cp == '.') {
87		*pp++ = val, cp++;
88		goto again;
89	}
90	if (*cp && !isspace(*cp&0xff))
91		return (INADDR_NONE);
92	*pp++ = val;
93	n = pp - parts;
94	if (n > 4U)
95		return (INADDR_NONE);
96	for (val = 0, i = 0; i < n; i++) {
97		val <<= 8;
98		val |= parts[i] & 0xff;
99	}
100	return (val);
101}
102
103/*
104 * Weak aliases for applications that use certain private entry points,
105 * and fail to include <arpa/inet.h>.
106 */
107#undef inet_network
108__weak_reference(__inet_network, inet_network);
109
110/*! \file */
111