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[glibc.git] / resolv / inet_addr.c
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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 #include "../conf/portability.h"
68 /* these are compatibility routines, not needed on recent BSD releases */
71 * Ascii internet address interpretation routine.
72 * The value returned is in network order.
74 u_int32_t
75 inet_addr(cp)
76 register const char *cp;
78 struct in_addr val;
80 if (inet_aton(cp, &val))
81 return (val.s_addr);
82 return (INADDR_NONE);
86 * Check whether "cp" is a valid ascii representation
87 * of an Internet address and convert to a binary address.
88 * Returns 1 if the address is valid, 0 if not.
89 * This replaces inet_addr, the return value from which
90 * cannot distinguish between failure and a local broadcast address.
92 int
93 inet_aton(cp, addr)
94 register const char *cp;
95 struct in_addr *addr;
97 register u_int32_t val; /* changed from u_long --david */
98 register int base, n;
99 register char c;
100 u_int parts[4];
101 register u_int *pp = parts;
103 c = *cp;
104 for (;;) {
106 * Collect number up to ``.''.
107 * Values are specified as for C:
108 * 0x=hex, 0=octal, isdigit=decimal.
110 if (!isdigit(c))
111 return (0);
112 val = 0; base = 10;
113 if (c == '0') {
114 c = *++cp;
115 if (c == 'x' || c == 'X')
116 base = 16, c = *++cp;
117 else
118 base = 8;
120 for (;;) {
121 if (isascii(c) && isdigit(c)) {
122 val = (val * base) + (c - '0');
123 c = *++cp;
124 } else if (base == 16 && isascii(c) && isxdigit(c)) {
125 val = (val << 4) |
126 (c + 10 - (islower(c) ? 'a' : 'A'));
127 c = *++cp;
128 } else
129 break;
131 if (c == '.') {
133 * Internet format:
134 * a.b.c.d
135 * a.b.c (with c treated as 16 bits)
136 * a.b (with b treated as 24 bits)
138 if (pp >= parts + 3)
139 return (0);
140 *pp++ = val;
141 c = *++cp;
142 } else
143 break;
146 * Check for trailing characters.
148 if (c != '\0' && (!isascii(c) || !isspace(c)))
149 return (0);
151 * Concoct the address according to
152 * the number of parts specified.
154 n = pp - parts + 1;
155 switch (n) {
157 case 0:
158 return (0); /* initial nondigit */
160 case 1: /* a -- 32 bits */
161 break;
163 case 2: /* a.b -- 8.24 bits */
164 if (val > 0xffffff)
165 return (0);
166 val |= parts[0] << 24;
167 break;
169 case 3: /* a.b.c -- 8.8.16 bits */
170 if (val > 0xffff)
171 return (0);
172 val |= (parts[0] << 24) | (parts[1] << 16);
173 break;
175 case 4: /* a.b.c.d -- 8.8.8.8 bits */
176 if (val > 0xff)
177 return (0);
178 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
179 break;
181 if (addr)
182 addr->s_addr = htonl(val);
183 return (1);