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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/lib/libc/inet/inet_network.c
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/*-

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 * SPDX-License-Identifier: BSD-3-Clause

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 *

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 * Copyright (c) 1983, 1993

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 *	The Regents of the University of California.  All rights reserved.

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 *

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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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 * are met:

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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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 *

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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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 * SUCH DAMAGE.

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 */

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#include "port_before.h"

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#include <sys/types.h>

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#include <netinet/in.h>

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#include <arpa/inet.h>

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#include <ctype.h>

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#include "port_after.h"

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/*%

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 * Internet network address interpretation routine.

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 * The library routines call this routine to interpret

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 * network numbers.

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 */

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in_addr_t

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inet_network(const char *cp)

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{

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	in_addr_t val, base, n;

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	char c;

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	in_addr_t parts[4], *pp = parts;

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	int i, digit;

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again:

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	val = 0; base = 10; digit = 0;

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	if (*cp == '0')

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		digit = 1, base = 8, cp++;

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	if (*cp == 'x' || *cp == 'X')

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		base = 16, cp++;

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	while ((c = *cp) != 0) {

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		if (isdigit((unsigned char)c)) {

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			if (base == 8U && (c == '8' || c == '9'))

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				return (INADDR_NONE);

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			val = (val * base) + (c - '0');

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			cp++;

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			digit = 1;

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			continue;

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		}

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		if (base == 16U && isxdigit((unsigned char)c)) {

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			val = (val << 4) +

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			      (c + 10 - (islower((unsigned char)c) ? 'a' : 'A'));

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			cp++;

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			digit = 1;

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			continue;

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		}

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		break;

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	}

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	if (!digit)

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		return (INADDR_NONE);

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	if (pp >= parts + 4 || val > 0xffU)

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		return (INADDR_NONE);

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	if (*cp == '.') {

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		*pp++ = val, cp++;

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		goto again;

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	}

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	if (*cp && !isspace(*cp&0xff))

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		return (INADDR_NONE);

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	*pp++ = val;

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	n = pp - parts;

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	if (n > 4U)

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		return (INADDR_NONE);

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	for (val = 0, i = 0; i < n; i++) {

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		val <<= 8;

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		val |= parts[i] & 0xff;

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	}

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	return (val);

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}

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/*

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 * Weak aliases for applications that use certain private entry points,

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 * and fail to include <arpa/inet.h>.

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 */

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#undef inet_network

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__weak_reference(__inet_network, inet_network);

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/*! \file */

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