Update.
[glibc.git] / resolv / inet_addr.c
blob0d3ba068d59f67c86f39b02963910453f69b9cbd
1 /*
2 * ++Copyright++ 1983, 1990, 1993
3 * -
4 * Copyright (c) 1983, 1990, 1993
5 * The Regents of the University of California. All rights reserved.
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--
56 #if defined(LIBC_SCCS) && !defined(lint)
57 static char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93";
58 static char rcsid[] = "$Id$";
59 #endif /* LIBC_SCCS and not lint */
61 #include <sys/types.h>
62 #include <sys/param.h>
63 #include <netinet/in.h>
64 #include <arpa/inet.h>
65 #include <ctype.h>
66 #ifdef _LIBC
67 # include <stdlib.h>
68 # include <limits.h>
69 # include <errno.h>
70 #endif
71 #include "../conf/portability.h"
73 /* these are compatibility routines, not needed on recent BSD releases */
76 * Ascii internet address interpretation routine.
77 * The value returned is in network order.
79 u_int32_t
80 inet_addr(cp)
81 register const char *cp;
83 struct in_addr val;
85 if (inet_aton(cp, &val))
86 return (val.s_addr);
87 return (INADDR_NONE);
91 * Check whether "cp" is a valid ascii representation
92 * of an Internet address and convert to a binary address.
93 * Returns 1 if the address is valid, 0 if not.
94 * This replaces inet_addr, the return value from which
95 * cannot distinguish between failure and a local broadcast address.
97 int
98 inet_aton(cp, addr)
99 const char *cp;
100 struct in_addr *addr;
102 register u_int32_t val; /* changed from u_long --david */
103 #ifndef _LIBC
104 register int base;
105 #endif
106 register int n;
107 register char c;
108 u_int32_t parts[4];
109 register u_int32_t *pp = parts;
111 #ifdef _LIBC
112 int saved_errno = errno;
113 __set_errno (0);
114 #endif
116 c = *cp;
117 for (;;) {
119 * Collect number up to ``.''.
120 * Values are specified as for C:
121 * 0x=hex, 0=octal, isdigit=decimal.
123 if (!isdigit(c))
124 goto ret_0;
125 #ifdef _LIBC
127 unsigned long ul = strtoul (cp, (char **) &cp, 0);
128 if (ul == ULONG_MAX && errno == ERANGE)
129 goto ret_0;
130 if (ul > 0xfffffffful)
131 goto ret_0;
132 val = ul;
134 c = *cp;
135 #else
136 base = 10;
137 if (c == '0') {
138 c = *++cp;
139 if (c == 'x' || c == 'X')
140 base = 16, c = *++cp;
141 else
142 base = 8;
144 val = 0;
145 for (;;) {
146 if (isascii(c) && isdigit(c)) {
147 val = (val * base) + (c - '0');
148 c = *++cp;
149 } else if (base == 16 && isascii(c) && isxdigit(c)) {
150 val = (val << 4) |
151 (c + 10 - (islower(c) ? 'a' : 'A'));
152 c = *++cp;
153 } else
154 break;
156 #endif
157 if (c == '.') {
159 * Internet format:
160 * a.b.c.d
161 * a.b.c (with c treated as 16 bits)
162 * a.b (with b treated as 24 bits)
164 if (pp >= parts + 3)
165 goto ret_0;
166 *pp++ = val;
167 c = *++cp;
168 } else
169 break;
172 * Check for trailing characters.
174 if (c != '\0' && (!isascii(c) || !isspace(c)))
175 goto ret_0;
177 * Concoct the address according to
178 * the number of parts specified.
180 n = pp - parts + 1;
181 switch (n) {
183 case 0:
184 goto ret_0; /* initial nondigit */
186 case 1: /* a -- 32 bits */
187 break;
189 case 2: /* a.b -- 8.24 bits */
190 if (val > 0xffffff)
191 goto ret_0;
192 val |= parts[0] << 24;
193 break;
195 case 3: /* a.b.c -- 8.8.16 bits */
196 if (val > 0xffff)
197 goto ret_0;
198 val |= (parts[0] << 24) | (parts[1] << 16);
199 break;
201 case 4: /* a.b.c.d -- 8.8.8.8 bits */
202 if (val > 0xff)
203 goto ret_0;
204 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
205 break;
207 if (addr)
208 addr->s_addr = htonl(val);
210 #ifdef _LIBC
211 __set_errno (saved_errno);
212 #endif
213 return (1);
215 ret_0:
216 #ifdef _LIBC
217 __set_errno (saved_errno);
218 #endif
219 return (0);