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)
35 static const char sccsid[] = "@(#)inet_network.c 8.1 (Berkeley) 6/4/93";
36 #endif /* LIBC_SCCS and not lint */
37
38 #include "port_before.h"
39
40 #include <sys/types.h>
41 #include <netinet/in.h>
42 #include <arpa/inet.h>
43 #include <ctype.h>
44
45 #include "port_after.h"
46
47 /*%
48 * Internet network address interpretation routine.
49 * The library routines call this routine to interpret
50 * network numbers.
51 */
52 u_long
inet_network(cp)53 inet_network(cp)
54 register const char *cp;
55 {
56 register u_long val, base, n, i;
57 register char c;
58 u_long parts[4], *pp = parts;
59 int digit;
60
61 again:
62 val = 0; base = 10; digit = 0;
63 if (*cp == '0')
64 digit = 1, base = 8, cp++;
65 if (*cp == 'x' || *cp == 'X')
66 base = 16, cp++;
67 while ((c = *cp) != 0) {
68 if (isdigit((unsigned char)c)) {
69 if (base == 8U && (c == '8' || c == '9'))
70 return (INADDR_NONE);
71 val = (val * base) + (c - '0');
72 cp++;
73 digit = 1;
74 continue;
75 }
76 if (base == 16U && isxdigit((unsigned char)c)) {
77 val = (val << 4) +
78 (c + 10 - (islower((unsigned char)c) ? 'a' : 'A'));
79 cp++;
80 digit = 1;
81 continue;
82 }
83 break;
84 }
85 if (!digit)
86 return (INADDR_NONE);
87 if (pp >= parts + 4 || val > 0xffU)
88 return (INADDR_NONE);
89 if (*cp == '.') {
90 *pp++ = val, cp++;
91 goto again;
92 }
93 if (*cp && !isspace(*cp&0xff))
94 return (INADDR_NONE);
95 *pp++ = val;
96 n = pp - parts;
97 if (n > 4U)
98 return (INADDR_NONE);
99 for (val = 0, i = 0; i < n; i++) {
100 val <<= 8;
101 val |= parts[i] & 0xff;
102 }
103 return (val);
104 }
105
106 /*! \file */
107