150 lines
3.5 KiB
C
150 lines
3.5 KiB
C
/*
|
|
* Copyright (c) 1983, 1990 Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms are permitted provided
|
|
* that: (1) source distributions retain this entire copyright notice and
|
|
* comment, and (2) distributions including binaries display the following
|
|
* acknowledgement: ``This product includes software developed by the
|
|
* University of California, Berkeley and its contributors'' in the
|
|
* documentation or other materials provided with the distribution and in
|
|
* all advertising materials mentioning features or use of this software.
|
|
* Neither the name of the University nor the names of its contributors may
|
|
* be used to endorse or promote products derived from this software without
|
|
* specific prior written permission.
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
|
|
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
|
*/
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
static char sccsid[] = "@(#)inet_addr.c 5.8 (Berkeley) 6/23/90";
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
#if _MINIX
|
|
#include <sys/types.h>
|
|
#include <ctype.h>
|
|
#include <errno.h>
|
|
|
|
#include <net/hton.h>
|
|
#include <net/gen/in.h>
|
|
#include <net/gen/inet.h>
|
|
#endif
|
|
|
|
#ifdef __STDC__
|
|
#define _CONST const
|
|
#else
|
|
#define _CONST
|
|
#endif
|
|
|
|
/*
|
|
* Ascii internet address interpretation routine.
|
|
* The value returned is in network order.
|
|
*/
|
|
ipaddr_t
|
|
inet_addr(cp)
|
|
register _CONST char *cp;
|
|
{
|
|
ipaddr_t val;
|
|
|
|
if (inet_aton(cp, &val))
|
|
return (val);
|
|
errno= EINVAL;
|
|
return (ipaddr_t)-1;
|
|
}
|
|
|
|
/*
|
|
* Check whether "cp" is a valid ascii representation
|
|
* of an Internet address and convert to a binary address.
|
|
* Returns 1 if the address is valid, 0 if not.
|
|
* This replaces inet_addr, the return value from which
|
|
* cannot distinguish between failure and a local broadcast address.
|
|
*/
|
|
|
|
int
|
|
inet_aton(cp, addr)
|
|
register _CONST char *cp;
|
|
ipaddr_t *addr;
|
|
{
|
|
register u32_t val, base, n;
|
|
register char c;
|
|
u32_t parts[4], *pp = parts;
|
|
|
|
for (;;) {
|
|
/*
|
|
* Collect number up to ``.''.
|
|
* Values are specified as for C:
|
|
* 0x=hex, 0=octal, other=decimal.
|
|
*/
|
|
val = 0; base = 10;
|
|
if (*cp == '0') {
|
|
if (*++cp == 'x' || *cp == 'X')
|
|
base = 16, cp++;
|
|
else
|
|
base = 8;
|
|
}
|
|
while ((c = *cp) != '\0') {
|
|
if (isascii(c) && isdigit(c)) {
|
|
val = (val * base) + (c - '0');
|
|
cp++;
|
|
continue;
|
|
}
|
|
if (base == 16 && isascii(c) && isxdigit(c)) {
|
|
val = (val << 4) +
|
|
(c + 10 - (islower(c) ? 'a' : 'A'));
|
|
cp++;
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
if (*cp == '.') {
|
|
/*
|
|
* Internet format:
|
|
* a.b.c.d
|
|
* a.b.c (with c treated as 16-bits)
|
|
* a.b (with b treated as 24 bits)
|
|
*/
|
|
if (pp >= parts + 3 || val > 0xff)
|
|
return (0);
|
|
*pp++ = val, cp++;
|
|
} else
|
|
break;
|
|
}
|
|
/*
|
|
* Check for trailing characters.
|
|
*/
|
|
if (*cp && (!isascii(*cp) || !isspace(*cp)))
|
|
return (0);
|
|
/*
|
|
* Concoct the address according to
|
|
* the number of parts specified.
|
|
*/
|
|
n = pp - parts + 1;
|
|
switch (n) {
|
|
|
|
case 1: /* a -- 32 bits */
|
|
break;
|
|
|
|
case 2: /* a.b -- 8.24 bits */
|
|
if (val > 0xffffff)
|
|
return (0);
|
|
val |= parts[0] << 24;
|
|
break;
|
|
|
|
case 3: /* a.b.c -- 8.8.16 bits */
|
|
if (val > 0xffff)
|
|
return (0);
|
|
val |= (parts[0] << 24) | (parts[1] << 16);
|
|
break;
|
|
|
|
case 4: /* a.b.c.d -- 8.8.8.8 bits */
|
|
if (val > 0xff)
|
|
return (0);
|
|
val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
|
|
break;
|
|
}
|
|
if (addr)
|
|
*addr = htonl(val);
|
|
return (1);
|
|
}
|