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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
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41 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
42 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
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46 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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.
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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
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>
89 * Ascii internet address interpretation routine.
90 * The value returned is in network order.
93 inet_addr(const char *cp) {
96 if (__inet_aton(cp, &val))
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.
109 __inet_aton(const char *cp, struct in_addr *addr)
111 static const in_addr_t max[4] = { 0xffffffff, 0xffffff, 0xffff, 0xff };
121 uint8_t *pp = res.bytes;
125 int saved_errno = errno;
134 * Collect number up to ``.''.
135 * Values are specified as for C:
136 * 0x=hex, 0=octal, isdigit=decimal.
143 unsigned long ul = strtoul (cp, (char **) &endp, 0);
144 if (ul == ULONG_MAX && errno == ERANGE)
146 if (ul > 0xfffffffful)
154 val = 0; base = 10; digit = 0;
157 if (c == 'x' || c == 'X')
158 base = 16, c = *++cp;
165 if (isascii(c) && isdigit(c)) {
166 if (base == 8 && (c == '8' || c == '9'))
168 val = (val * base) + (c - '0');
171 } else if (base == 16 && isascii(c) && isxdigit(c)) {
173 (c + 10 - (islower(c) ? 'a' : 'A'));
184 * a.b.c (with c treated as 16 bits)
185 * a.b (with b treated as 24 bits)
187 if (pp > res.bytes + 2 || val > 0xff)
195 * Check for trailing characters.
197 if (c != '\0' && (!isascii(c) || !isspace(c)))
200 * Did we get a valid digit?
205 /* Check whether the last part is in its limits depending on
206 the number of parts in total. */
207 if (val > max[pp - res.bytes])
211 addr->s_addr = res.word | htonl (val);
214 __set_errno (saved_errno);
220 __set_errno (saved_errno);
224 weak_alias (__inet_aton, inet_aton)
225 libc_hidden_def (__inet_aton)
226 libc_hidden_weak (inet_aton)