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/* src/port/inet_aton.c
*
* This inet_aton() function was taken from the GNU C library and
* incorporated into Postgres for those systems which do not have this
* routine in their standard C libraries.
*
* The function was been extracted whole from the file inet_aton.c in
* Release 5.3.12 of the Linux C library, which is derived from the
* GNU C library, by Bryan Henderson in October 1996. The copyright
* notice from that file is below.
*/
/*
* Copyright (c) 1983, 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE. */
#include "c.h"
#include <netinet/in.h>
#include <ctype.h>
#include "port/pg_bswap.h"
/*
* 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(const char *cp, struct in_addr *addr)
{
unsigned int val;
int base,
n;
char c;
u_int parts[4];
u_int *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 (isdigit((unsigned char) c))
{
val = (val * base) + (c - '0');
cp++;
continue;
}
if (base == 16 && isxdigit((unsigned char) c))
{
val = (val << 4) +
(c + 10 - (islower((unsigned char) 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 junk.
*/
while (*cp)
if (!isspace((unsigned char) *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->s_addr = pg_hton32(val);
return 1;
}
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