1 /*
2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. All rights reserved.
4 * 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. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed by the University of
17 * California, Berkeley and its contributors.
18 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 #if defined(LIBC_SCCS) && !defined(lint)
36 static char sccsid[] = "@(#)inet_network.c 8.1 (Berkeley) 6/4/93";
37 #endif /* LIBC_SCCS and not lint */
38
39 #include "inetprivate.h"
40
41 /*
42 * Internet network address interpretation routine.
43 * The library routines call this routine to interpret
44 * network numbers.
45 */
46 u_int32_t
inet_network(const char * cp)47 inet_network(const char *cp)
48 {
49 register u_long val, base, n;
50 register char c;
51 u_long parts[4], *pp = parts;
52 register int i;
53
54 again:
55 /*
56 * Collect number up to ``.''.
57 * Values are specified as for C:
58 * 0x=hex, 0=octal, other=decimal.
59 */
60 val = 0; base = 10;
61 /*
62 * The 4.4BSD version of this file also accepts 'x__' as a hexa
63 * number. I don't think this is correct. -- Uli
64 */
65 if (*cp == '0') {
66 if (*++cp == 'x' || *cp == 'X')
67 base = 16, cp++;
68 else
69 base = 8;
70 }
71 while ((c = *cp)) {
72 if (isdigit(c)) {
73 val = (val * base) + (c - '0');
74 cp++;
75 continue;
76 }
77 if (base == 16 && isxdigit(c)) {
78 val = (val << 4) + (c + 10 - (islower(c) ? 'a' : 'A'));
79 cp++;
80 continue;
81 }
82 break;
83 }
84 if (*cp == '.') {
85 if (pp >= parts + 4)
86 return (INADDR_NONE);
87 *pp++ = val, cp++;
88 goto again;
89 }
90 if (*cp && !isspace(*cp))
91 return (INADDR_NONE);
92 *pp++ = val;
93 n = pp - parts;
94 if (n > 4)
95 return (INADDR_NONE);
96 for (val = 0, i = 0; i < (int)n; i++) {
97 val <<= 8;
98 val |= parts[i] & 0xff;
99 }
100 return (val);
101 }
102