kernel - Fix issue w/ buffer ortation when doing non-blocking read from bpf
[dragonfly.git] / contrib / ipfilter / inet_addr.c
blobe940280a280af668a4216fa07a2334d369a90a5d
1 /*
2 * ++Copyright++ 1983, 1990, 1993
3 * -
4 * Copyright (c) 1983, 1990, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by the University of
18 * California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 * -
35 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
37 * Permission to use, copy, modify, and distribute this software for any
38 * purpose with or without fee is hereby granted, provided that the above
39 * copyright notice and this permission notice appear in all copies, and that
40 * the name of Digital Equipment Corporation not be used in advertising or
41 * publicity pertaining to distribution of the document or software without
42 * specific, written prior permission.
44 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
45 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
46 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
47 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
48 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
49 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
50 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
51 * SOFTWARE.
52 * -
53 * --Copyright--
55 #ifdef __STDC__
56 # ifndef __P
57 # define __P(x) x
58 # endif
59 #else
60 # undef __P
61 # define __P(x) ()
62 # undef const
63 # define const
64 #endif
66 #if !defined(lint)
67 static const char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93";
68 static const char rcsid[] = "@(#)$Id: inet_addr.c,v 2.1.4.2 2002/02/22 15:32:46 darrenr Exp $";
69 #endif /* LIBC_SCCS and not lint */
71 #include <sys/param.h>
72 #include <netinet/in.h>
73 #include <arpa/inet.h>
74 #include <ctype.h>
76 int inet_aton __P((const char *, struct in_addr *));
78 /*
79 * Check whether "cp" is a valid ascii representation
80 * of an Internet address and convert to a binary address.
81 * Returns 1 if the address is valid, 0 if not.
82 * This replaces inet_addr, the return value from which
83 * cannot distinguish between failure and a local broadcast address.
85 int
86 inet_aton(cp, addr)
87 register const char *cp;
88 struct in_addr *addr;
90 register u_long val;
91 register int base, n;
92 register char c;
93 u_int parts[4];
94 register u_int *pp = parts;
96 c = *cp;
97 for (;;) {
99 * Collect number up to ``.''.
100 * Values are specified as for C:
101 * 0x=hex, 0=octal, isdigit=decimal.
103 if (!isdigit(c))
104 return (0);
105 val = 0; base = 10;
106 if (c == '0') {
107 c = *++cp;
108 if (c == 'x' || c == 'X')
109 base = 16, c = *++cp;
110 else
111 base = 8;
113 for (;;) {
114 if (isascii(c) && isdigit(c)) {
115 val = (val * base) + (c - '0');
116 c = *++cp;
117 } else if (base == 16 && isascii(c) && isxdigit(c)) {
118 val = (val << 4) |
119 (c + 10 - (islower(c) ? 'a' : 'A'));
120 c = *++cp;
121 } else
122 break;
124 if (c == '.') {
126 * Internet format:
127 * a.b.c.d
128 * a.b.c (with c treated as 16 bits)
129 * a.b (with b treated as 24 bits)
131 if (pp >= parts + 3)
132 return (0);
133 *pp++ = val;
134 c = *++cp;
135 } else
136 break;
139 * Check for trailing characters.
141 if (c != '\0' && (!isascii(c) || !isspace(c)))
142 return (0);
144 * Concoct the address according to
145 * the number of parts specified.
147 n = pp - parts + 1;
148 switch (n) {
150 case 0:
151 return (0); /* initial nondigit */
153 case 1: /* a -- 32 bits */
154 break;
156 case 2: /* a.b -- 8.24 bits */
157 if (val > 0xffffff)
158 return (0);
159 val |= parts[0] << 24;
160 break;
162 case 3: /* a.b.c -- 8.8.16 bits */
163 if (val > 0xffff)
164 return (0);
165 val |= (parts[0] << 24) | (parts[1] << 16);
166 break;
168 case 4: /* a.b.c.d -- 8.8.8.8 bits */
169 if (val > 0xff)
170 return (0);
171 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
172 break;
174 if (addr)
175 addr->s_addr = htonl(val);
176 return (1);
179 /* these are compatibility routines, not needed on recent BSD releases */
182 * Ascii internet address interpretation routine.
183 * The value returned is in network order.
185 #if (defined(SOLARIS2) && (SOLARIS2 > 5)) || \
186 (defined(IRIX) && (IRIX >= 605))
187 in_addr_t
188 #else
189 u_long
190 #endif
191 inet_addr(cp)
192 register const char *cp;
194 struct in_addr val;
196 if (inet_aton(cp, &val))
197 return (val.s_addr);
198 return (0xffffffff);