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/* src/port/inet_aton.c
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* This inet_aton() function was taken from the GNU C library and
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* incorporated into Postgres for those systems which do not have this
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* routine in their standard C libraries.
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* The function was been extracted whole from the file inet_aton.c in
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* Release 5.3.12 of the Linux C library, which is derived from the
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* GNU C library, by Bryan Henderson in October 1996. The copyright
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* notice from that file is below.
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* Copyright (c) 1983, 1990, 1993
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* The Regents of the University of California. All rights reserved.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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#include <netinet/in.h>
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* Check whether "cp" is a valid ascii representation
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* of an Internet address and convert to a binary address.
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* Returns 1 if the address is valid, 0 if not.
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* This replaces inet_addr, the return value from which
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* cannot distinguish between failure and a local broadcast address.
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inet_aton(const char *cp, struct in_addr * addr)
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* Collect number up to ``.''. Values are specified as for C: 0x=hex,
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* 0=octal, other=decimal.
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if (*++cp == 'x' || *cp == 'X')
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while ((c = *cp) != '\0')
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if (isdigit((unsigned char) c))
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val = (val * base) + (c - '0');
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if (base == 16 && isxdigit((unsigned char) c))
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(c + 10 - (islower((unsigned char) c) ? 'a' : 'A'));
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* Internet format: a.b.c.d a.b.c (with c treated as 16-bits)
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* a.b (with b treated as 24 bits)
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if (pp >= parts + 3 || val > 0xff)
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* Check for trailing junk.
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if (!isspace((unsigned char) *cp++))
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* Concoct the address according to the number of parts specified.
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case 1: /* a -- 32 bits */
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case 2: /* a.b -- 8.24 bits */
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val |= parts[0] << 24;
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case 3: /* a.b.c -- 8.8.16 bits */
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val |= (parts[0] << 24) | (parts[1] << 16);
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case 4: /* a.b.c.d -- 8.8.8.8 bits */
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val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
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addr->s_addr = htonl(val);