1 /* $OpenBSD: inet_network.c,v 1.10 2005/08/06 20:30:03 espie Exp $ */
2 /*
3 * Copyright (c) 1983, 1993
4 * The Regents of the University of California. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the University nor the names of its contributors
15 * may be used to endorse or promote products derived from this software
16 * without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 #include <sys/types.h>
32 #include <netinet/in.h>
33 #include <arpa/inet.h>
34 #include <ctype.h>
35
36 __RCSID("$MirOS: src/lib/libc/net/inet_network.c,v 1.2 2009/11/09 21:30:51 tg Exp $");
37
38 /*
39 * Internet network address interpretation routine.
40 * The library routines call this routine to interpret
41 * network numbers.
42 */
43 in_addr_t
inet_network(const char * cp)44 inet_network(const char *cp)
45 {
46 in_addr_t val, base, n;
47 char c;
48 in_addr_t parts[4], *pp = parts;
49 unsigned int i;
50
51 again:
52 val = 0; base = 10;
53 if (*cp == '0')
54 base = 8, cp++;
55 if (*cp == 'x' || *cp == 'X')
56 base = 16, cp++;
57 while ((c = *cp)) {
58 if (isdigit(c)) {
59 val = (val * base) + (c - '0');
60 cp++;
61 continue;
62 }
63 if (base == 16 && isxdigit(c)) {
64 val = (val << 4) + (c + 10 - (islower(c) ? 'a' : 'A'));
65 cp++;
66 continue;
67 }
68 break;
69 }
70 if (*cp == '.') {
71 if (pp >= parts + 3)
72 return (INADDR_NONE);
73 *pp++ = val, cp++;
74 goto again;
75 }
76 if (*cp && !isspace(*cp))
77 return (INADDR_NONE);
78 *pp++ = val;
79 n = pp - parts;
80 for (val = 0, i = 0; i < 4; i++) {
81 val <<= 8;
82 if (i < n)
83 val |= parts[i] & 0xff;
84 }
85 return (val);
86 }
87