Annotation of embedaddon/dhcp/omapip/inet_addr.c, revision 1.1.1.1
1.1 misho 1: /* $NetBSD: inet_addr.c,v 1.6 1996/02/02 15:22:23 mrg Exp $ */
2:
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.
22: *
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:
36: #if defined(LIBC_SCCS) && !defined(lint)
37: #if 0
38: static char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93";
39: #else
40: static char rcsid[] = "$NetBSD: inet_addr.c,v 1.6 1996/02/02 15:22:23 mrg Exp $";
41: #endif
42: #endif /* LIBC_SCCS and not lint */
43:
44: #include "dhcpd.h"
45:
46: #include "omapip/omapip_p.h"
47:
48: #ifdef NEED_INET_ATON
49: /*
50: * Check whether "cp" is a valid ascii representation
51: * of an Internet address and convert to a binary address.
52: * Returns 1 if the address is valid, 0 if not.
53: * This replaces inet_addr, the return value from which
54: * cannot distinguish between failure and a local broadcast address.
55: */
56: int
57: inet_aton(cp, addr)
58: const char *cp;
59: struct in_addr *addr;
60: {
61: register u_long val;
62: register int base, n;
63: register char c;
64: u_int parts[4];
65: register u_int *pp = parts;
66:
67: for (;;) {
68: /*
69: * Collect number up to ``.''.
70: * Values are specified as for C:
71: * 0x=hex, 0=octal, other=decimal.
72: */
73: val = 0; base = 10;
74: if (*cp == '0') {
75: if (*++cp == 'x' || *cp == 'X')
76: base = 16, cp++;
77: else
78: base = 8;
79: }
80: while ((c = *cp) != '\0') {
81: if (isascii(c) && isdigit((int)c)) {
82: val = (val * base) + (c - '0');
83: cp++;
84: continue;
85: }
86: if (base == 16 && isascii(c) && isxdigit((int)c)) {
87: val = (val << 4) +
88: (c + 10 - (islower((int)c) ? 'a' : 'A'));
89: cp++;
90: continue;
91: }
92: break;
93: }
94: if (*cp == '.') {
95: /*
96: * Internet format:
97: * a.b.c.d
98: * a.b.c (with c treated as 16-bits)
99: * a.b (with b treated as 24 bits)
100: */
101: if (pp >= parts + 3 || val > 0xff)
102: return (0);
103: *pp++ = val, cp++;
104: } else
105: break;
106: }
107: /*
108: * Check for trailing characters.
109: */
110: if (*cp && (!isascii(*cp) || !isspace((int)*cp)))
111: return (0);
112: /*
113: * Concoct the address according to
114: * the number of parts specified.
115: */
116: n = pp - parts + 1;
117: switch (n) {
118:
119: case 0:
120: return (0); /* initial nondigit */
121:
122: case 1: /* a -- 32 bits */
123: break;
124:
125: case 2: /* a.b -- 8.24 bits */
126: if (val > 0xffffff)
127: return (0);
128: val |= parts[0] << 24;
129: break;
130:
131: case 3: /* a.b.c -- 8.8.16 bits */
132: if (val > 0xffff)
133: return (0);
134: val |= (parts[0] << 24) | (parts[1] << 16);
135: break;
136:
137: case 4: /* a.b.c.d -- 8.8.8.8 bits */
138: if (val > 0xff)
139: return (0);
140: val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
141: break;
142: }
143: if (addr)
144: addr->s_addr = htonl(val);
145: return (1);
146: }
147: #endif
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