text: /*-
   * SPDX-License-Identifier: BSD-3-Clause
   *
   * Copyright (c) 1983, 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.
   */
  
  #if defined(LIBC_SCCS) && !defined(lint)
  static const char sccsid[] = "@(#)inet_network.c	8.1 (Berkeley) 6/4/93";
  #endif /* LIBC_SCCS and not lint */
  #include <sys/cdefs.h>
  __FBSDID("$FreeBSD$");
  
  #include "port_before.h"
  
  #include <sys/types.h>
  #include <netinet/in.h>
  #include <arpa/inet.h>
  #include <ctype.h>
  
  #include "port_after.h"
  
  /*%
   * Internet network address interpretation routine.
   * The library routines call this routine to interpret
   * network numbers.
   */
  in_addr_t
  inet_network(const char *cp)
  {
  	in_addr_t val, base, n;
  	char c;
  	in_addr_t parts[4], *pp = parts;
  	int i, digit;
  
  again:
  	val = 0; base = 10; digit = 0;
  	if (*cp == '0')
  		digit = 1, base = 8, cp++;
  	if (*cp == 'x' || *cp == 'X')
  		base = 16, cp++;
  	while ((c = *cp) != 0) {
  		if (isdigit((unsigned char)c)) {
  			if (base == 8U && (c == '8' || c == '9'))
  				return (INADDR_NONE);
  			val = (val * base) + (c - '0');
  			cp++;
  			digit = 1;
  			continue;
  		}
  		if (base == 16U && isxdigit((unsigned char)c)) {
  			val = (val << 4) +
  			      (c + 10 - (islower((unsigned char)c) ? 'a' : 'A'));
  			cp++;
  			digit = 1;
  			continue;
  		}
  		break;
  	}
  	if (!digit)
  		return (INADDR_NONE);
  	if (pp >= parts + 4 || val > 0xffU)
  		return (INADDR_NONE);
  	if (*cp == '.') {
  		*pp++ = val, cp++;
  		goto again;
  	}
  	if (*cp && !isspace(*cp&0xff))
  		return (INADDR_NONE);
  	*pp++ = val;
  	n = pp - parts;
  	if (n > 4U)
  		return (INADDR_NONE);
  	for (val = 0, i = 0; i < n; i++) {
  		val <<= 8;
  		val |= parts[i] & 0xff;
  	}
  	return (val);
  }
  
  /*
   * Weak aliases for applications that use certain private entry points,
   * and fail to include <arpa/inet.h>.
   */
  #undef inet_network
  __weak_reference(__inet_network, inet_network);
  
  /*! \file */
  