source: trunk/minix/lib/ip/inet_network.c@ 10

Last change on this file since 10 was 9, checked in by Mattia Monga, 13 years ago

Minix 3.1.2a

File size: 3.0 KB
Line 
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 char sccsid[] = "@(#)inet_network.c 8.1 (Berkeley) 6/4/93";
36#endif /* LIBC_SCCS and not lint */
37
38#include <sys/types.h>
39#include <ctype.h>
40#include <net/gen/in.h>
41#include <net/gen/inet.h>
42
43#define INADDR_NONE ((ipaddr_t) -1)
44
45/*
46 * Internet network address interpretation routine.
47 * The library routines call this routine to interpret
48 * network numbers.
49 */
50ipaddr_t
51inet_network(cp)
52 register const char *cp;
53{
54 register ipaddr_t val, base, n;
55 register char c;
56 ipaddr_t parts[4], *pp = parts;
57 register int i;
58
59again:
60 val = 0; base = 10;
61 if (*cp == '0')
62 base = 8, cp++;
63 if (*cp == 'x' || *cp == 'X')
64 base = 16, cp++;
65 while (c = *cp) {
66 if (isdigit(c)) {
67 val = (val * base) + (c - '0');
68 cp++;
69 continue;
70 }
71 if (base == 16 && isxdigit(c)) {
72 val = (val << 4) + (c + 10 - (islower(c) ? 'a' : 'A'));
73 cp++;
74 continue;
75 }
76 break;
77 }
78 if (*cp == '.') {
79 if (pp >= parts + 4)
80 return (INADDR_NONE);
81 *pp++ = val, cp++;
82 goto again;
83 }
84 if (*cp && !isspace(*cp))
85 return (INADDR_NONE);
86 *pp++ = val;
87 n = pp - parts;
88 if (n > 4)
89 return (INADDR_NONE);
90 for (val = 0, i = 0; i < n; i++) {
91 val <<= 8;
92 val |= parts[i] & 0xff;
93 }
94 return (val);
95}
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