source: trunk/minix/lib/ip/inet_addr.c@ 11

Last change on this file since 11 was 9, checked in by Mattia Monga, 14 years ago

Minix 3.1.2a
File size: 3.5 KB
Line 
1/*
2 * Copyright (c) 1983, 1990 Regents of the University of California.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms are permitted provided
6 * that: (1) source distributions retain this entire copyright notice and
7 * comment, and (2) distributions including binaries display the following
8 * acknowledgement: ``This product includes software developed by the
9 * University of California, Berkeley and its contributors'' in the
10 * documentation or other materials provided with the distribution and in
11 * all advertising materials mentioning features or use of this software.
12 * Neither the name of the University nor the names of its contributors may
13 * be used to endorse or promote products derived from this software without
14 * specific prior written permission.
15 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
16 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
17 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
18 */
19
20#if defined(LIBC_SCCS) && !defined(lint)
21static char sccsid[] = "@(#)inet_addr.c 5.8 (Berkeley) 6/23/90";
22#endif /* LIBC_SCCS and not lint */
23
24#if _MINIX
25#include <sys/types.h>
26#include <ctype.h>
27#include <errno.h>
28
29#include <net/hton.h>
30#include <net/gen/in.h>
31#include <net/gen/inet.h>
32#endif
33
34#ifdef __STDC__
35#define _CONST const
36#else
37#define _CONST
38#endif
39
40/*
41 * Ascii internet address interpretation routine.
42 * The value returned is in network order.
43 */
44ipaddr_t
45inet_addr(cp)
46 register _CONST char *cp;
47{
48 ipaddr_t val;
49
50 if (inet_aton(cp, &val))
51 return (val);
52 errno= EINVAL;
53 return (ipaddr_t)-1;
54}
55
56/*
57 * Check whether "cp" is a valid ascii representation
58 * of an Internet address and convert to a binary address.
59 * Returns 1 if the address is valid, 0 if not.
60 * This replaces inet_addr, the return value from which
61 * cannot distinguish between failure and a local broadcast address.
62 */
63
64int
65inet_aton(cp, addr)
66 register _CONST char *cp;
67 ipaddr_t *addr;
68{
69 register u32_t val, base, n;
70 register char c;
71 u32_t parts[4], *pp = parts;
72
73 for (;;) {
74 /*
75 * Collect number up to ``.''.
76 * Values are specified as for C:
77 * 0x=hex, 0=octal, other=decimal.
78 */
79 val = 0; base = 10;
80 if (*cp == '0') {
81 if (*++cp == 'x' || *cp == 'X')
82 base = 16, cp++;
83 else
84 base = 8;
85 }
86 while ((c = *cp) != '\0') {
87 if (isascii(c) && isdigit(c)) {
88 val = (val * base) + (c - '0');
89 cp++;
90 continue;
91 }
92 if (base == 16 && isascii(c) && isxdigit(c)) {
93 val = (val << 4) +
94 (c + 10 - (islower(c) ? 'a' : 'A'));
95 cp++;
96 continue;
97 }
98 break;
99 }
100 if (*cp == '.') {
101 /*
102 * Internet format:
103 * a.b.c.d
104 * a.b.c (with c treated as 16-bits)
105 * a.b (with b treated as 24 bits)
106 */
107 if (pp >= parts + 3 || val > 0xff)
108 return (0);
109 *pp++ = val, cp++;
110 } else
111 break;
112 }
113 /*
114 * Check for trailing characters.
115 */
116 if (*cp && (!isascii(*cp) || !isspace(*cp)))
117 return (0);
118 /*
119 * Concoct the address according to
120 * the number of parts specified.
121 */
122 n = pp - parts + 1;
123 switch (n) {
124
125 case 1: /* a -- 32 bits */
126 break;
127
128 case 2: /* a.b -- 8.24 bits */
129 if (val > 0xffffff)
130 return (0);
131 val |= parts[0] << 24;
132 break;
133
134 case 3: /* a.b.c -- 8.8.16 bits */
135 if (val > 0xffff)
136 return (0);
137 val |= (parts[0] << 24) | (parts[1] << 16);
138 break;
139
140 case 4: /* a.b.c.d -- 8.8.8.8 bits */
141 if (val > 0xff)
142 return (0);
143 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
144 break;
145 }
146 if (addr)
147 *addr = htonl(val);
148 return (1);
149}
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