1 /* $NetBSD: lwinetaton.c,v 1.7 2014/12/10 04:38:02 christos Exp $ */
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60 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
61 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
62 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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69 /*! \file lwinetaton.c
71 #if defined(LIBC_SCCS) && !defined(lint)
72 static char sccsid
[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93";
73 static char rcsid
[] = "Id: lwinetaton.c,v 1.16 2007/06/19 23:47:22 tbox Exp ";
74 #endif /* LIBC_SCCS and not lint */
82 #include <lwres/int.h>
83 #include <lwres/net.h>
88 * Check whether "cp" is a valid ascii representation
89 * of an Internet address and convert to a binary address.
90 * Returns 1 if the address is valid, 0 if not.
91 * This replaces inet_addr, the return value from which
92 * cannot distinguish between failure and a local broadcast address.
95 lwres_net_aton(const char *cp
, struct in_addr
*addr
) {
100 lwres_uint8_t parts
[4];
101 lwres_uint8_t
*pp
= parts
;
109 * Collect number up to ``.''.
110 * Values are specified as for C:
111 * 0x=hex, 0=octal, isdigit=decimal.
113 if (!isdigit(c
& 0xff))
120 if (c
== 'x' || c
== 'X') {
130 * isascii() is valid for all integer values, and
131 * when it is true, c is known to be in scope
132 * for isdigit(). No cast necessary. Similar
133 * comment applies for later ctype uses.
135 if (isascii(c
) && isdigit(c
)) {
136 if (base
== 8 && (c
== '8' || c
== '9'))
138 val
= (val
* base
) + (c
- '0');
141 } else if (base
== 16 && isascii(c
) && isxdigit(c
)) {
143 (c
+ 10 - (islower(c
) ? 'a' : 'A'));
153 * a.b.c (with c treated as 16 bits)
154 * a.b (with b treated as 24 bits)
156 if (pp
>= parts
+ 3 || val
> 0xffU
)
158 *pp
++ = (lwres_uint8_t
)val
;
164 * Check for trailing characters.
166 if (c
!= '\0' && (!isascii(c
) || !isspace(c
)))
169 * Did we get a valid digit?
174 * Concoct the address according to
175 * the number of parts specified.
179 case 1: /* a -- 32 bits */
182 case 2: /* a.b -- 8.24 bits */
185 val
|= parts
[0] << 24;
188 case 3: /* a.b.c -- 8.8.16 bits */
191 val
|= (parts
[0] << 24) | (parts
[1] << 16);
194 case 4: /* a.b.c.d -- 8.8.8.8 bits */
197 val
|= (parts
[0] << 24) | (parts
[1] << 16) | (parts
[2] << 8);
201 addr
->s_addr
= htonl(val
);