Update.
[glibc.git] / resolv / inet_addr.c
blob83f2ec695e1ff19c51a33063d96799c0bf72c11e
1 /*
2 * Copyright (c) 1983, 1990, 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 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
31 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
33 * Permission to use, copy, modify, and distribute this software for any
34 * purpose with or without fee is hereby granted, provided that the above
35 * copyright notice and this permission notice appear in all copies, and that
36 * the name of Digital Equipment Corporation not be used in advertising or
37 * publicity pertaining to distribution of the document or software without
38 * specific, written prior permission.
40 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
41 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
42 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
43 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
44 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
45 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
46 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
47 * SOFTWARE.
51 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
53 * Permission to use, copy, modify, and distribute this software for any
54 * purpose with or without fee is hereby granted, provided that the above
55 * copyright notice and this permission notice appear in all copies.
57 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
58 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
59 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
60 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
61 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
62 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
63 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
64 * SOFTWARE.
67 #if defined(LIBC_SCCS) && !defined(lint)
68 static const char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93";
69 static const char rcsid[] = "$BINDId: inet_addr.c,v 8.11 1999/10/13 16:39:25 vixie Exp $";
70 #endif /* LIBC_SCCS and not lint */
72 #include <sys/types.h>
73 #include <sys/param.h>
75 #include <netinet/in.h>
76 #include <arpa/inet.h>
78 #include <ctype.h>
80 #ifdef _LIBC
81 # include <endian.h>
82 # include <stdint.h>
83 # include <stdlib.h>
84 # include <limits.h>
85 # include <errno.h>
86 #endif
89 * Ascii internet address interpretation routine.
90 * The value returned is in network order.
92 in_addr_t
93 inet_addr(const char *cp) {
94 struct in_addr val;
96 if (__inet_aton(cp, &val))
97 return (val.s_addr);
98 return (INADDR_NONE);
102 * Check whether "cp" is a valid ascii representation
103 * of an Internet address and convert to a binary address.
104 * Returns 1 if the address is valid, 0 if not.
105 * This replaces inet_addr, the return value from which
106 * cannot distinguish between failure and a local broadcast address.
108 in_addr_t
109 __inet_aton(const char *cp, struct in_addr *addr) {
110 static const in_addr_t max[4] = { 0xffffffff, 0xffffff, 0xffff, 0xff };
111 in_addr_t val;
112 #ifndef _LIBC
113 int base;
114 #endif
115 char c;
116 union iaddr {
117 uint8_t bytes[4];
118 uint32_t word;
119 } res;
120 uint8_t *pp = res.bytes;
121 int digit;
123 #ifdef _LIBC
124 int saved_errno = errno;
125 __set_errno (0);
126 #endif
128 res.word = 0;
130 c = *cp;
131 for (;;) {
133 * Collect number up to ``.''.
134 * Values are specified as for C:
135 * 0x=hex, 0=octal, isdigit=decimal.
137 if (!isdigit(c))
138 goto ret_0;
139 #ifdef _LIBC
141 char *endp;
142 unsigned long ul = strtoul (cp, (char **) &endp, 0);
143 if (ul == ULONG_MAX && errno == ERANGE)
144 goto ret_0;
145 if (ul > 0xfffffffful)
146 goto ret_0;
147 val = ul;
148 digit = cp != endp;
149 cp = endp;
151 c = *cp;
152 #else
153 val = 0; base = 10; digit = 0;
154 if (c == '0') {
155 c = *++cp;
156 if (c == 'x' || c == 'X')
157 base = 16, c = *++cp;
158 else {
159 base = 8;
160 digit = 1 ;
163 for (;;) {
164 if (isascii(c) && isdigit(c)) {
165 if (base == 8 && (c == '8' || c == '9'))
166 return (0);
167 val = (val * base) + (c - '0');
168 c = *++cp;
169 digit = 1;
170 } else if (base == 16 && isascii(c) && isxdigit(c)) {
171 val = (val << 4) |
172 (c + 10 - (islower(c) ? 'a' : 'A'));
173 c = *++cp;
174 digit = 1;
175 } else
176 break;
178 #endif
179 if (c == '.') {
181 * Internet format:
182 * a.b.c.d
183 * a.b.c (with c treated as 16 bits)
184 * a.b (with b treated as 24 bits)
186 if (pp > res.bytes + 2 || val > 0xff)
187 goto ret_0;
188 *pp++ = val;
189 c = *++cp;
190 } else
191 break;
194 * Check for trailing characters.
196 if (c != '\0' && (!isascii(c) || !isspace(c)))
197 goto ret_0;
199 * Did we get a valid digit?
201 if (!digit)
202 goto ret_0;
204 /* Check whether the last part is in its limits depending on
205 the number of parts in total. */
206 if (val > max[pp - res.bytes])
207 goto ret_0;
209 if (addr != NULL)
210 addr->s_addr = res.word | htonl (val);
212 #ifdef _LIBC
213 __set_errno (saved_errno);
214 #endif
215 return (1);
217 ret_0:
218 #ifdef _LIBC
219 __set_errno (saved_errno);
220 #endif
221 return (0);
223 weak_alias (__inet_aton, inet_aton)