/* inet_aton - convert string to numeric IP address *//* Snagged from GNU C library, version 2.0.3. *//* * ++Copyright++ 1983, 1990, 1993 * - * 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. All advertising materials mentioning features or use of this software *    must display the following acknowledgement: * 	This product includes software developed by the University of * 	California, Berkeley and its contributors. * 4. 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. * - * Portions Copyright (c) 1993 by Digital Equipment Corporation. * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies, and that * the name of Digital Equipment Corporation not be used in advertising or * publicity pertaining to distribution of the document or software without * specific, written prior permission. * * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS * SOFTWARE. * - * --Copyright-- */#if defined(LIBC_SCCS) && !defined(lint)static char sccsid[] = "@(#)inet_addr.c	8.1 (Berkeley) 6/17/93";static char rcsid[] = "$Id: inet_addr.c,v 1.5 1996/08/14 03:48:37 drepper Exp $";#endif /* LIBC_SCCS and not lint */#include <config.h>#if !defined (HAVE_INET_ATON) && defined (HAVE_NETWORK) && defined (HAVE_NETINET_IN_H) && defined (HAVE_ARPA_INET_H)#include <sys/types.h>#include <sys/param.h>#include <netinet/in.h>#include <arpa/inet.h>#ifdef HAVE_UNISTD_H#  include <unistd.h>#endif#include <bashansi.h>#include <ctype.h>#include <stdc.h>#ifndef INADDR_NONE#  define INADDR_NONE 0xffffffff#endif/* these are compatibility routines, not needed on recent BSD releases */#if 0/* Not used, not needed. *//* * Ascii internet address interpretation routine. * The value returned is in network order. */u_longinet_addr(cp)	register const char *cp;{	struct in_addr val;	if (inet_aton(cp, &val))		return (val.s_addr);	return (INADDR_NONE);}#endif/* * 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. */intinet_aton(cp, addr)	register const char *cp;	struct in_addr *addr;{	register u_bits32_t val;	register int base, n;	register unsigned char c;	u_int parts[4];	register u_int *pp = parts;	c = *cp;	for (;;) {		/*		 * Collect number up to ``.''.		 * Values are specified as for C:		 * 0x=hex, 0=octal, isdigit=decimal.		 */#if 0		if (!isdigit(c))#else		if (c != '0' && c != '1' && c != '2' && c != '3' && c != '4' &&		    c != '5' && c != '6' && c != '7' && c != '8' && c != '9')#endif			return (0);		val = 0; base = 10;		if (c == '0') {			c = *++cp;			if (c == 'x' || c == 'X')				base = 16, c = *++cp;			else				base = 8;		}		for (;;) {			if (isascii(c) && isdigit(c)) {				val = (val * base) + (c - '0');				c = *++cp;			} else if (base == 16 && isascii(c) && isxdigit(c)) {				val = (val << 4) |					(c + 10 - (islower(c) ? 'a' : 'A'));				c = *++cp;			} else				break;		}		if (c == '.') {			/*			 * 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)				return (0);			*pp++ = val;			c = *++cp;		} else			break;	}	/*	 * Check for trailing characters.	 */	if (c != '\0' && (!isascii(c) || !isspace(c)))		return (0);	/*	 * Concoct the address according to	 * the number of parts specified.	 */	n = pp - parts + 1;	switch (n) {	case 0:		return (0);		/* initial nondigit */	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 = htonl(val);	return (1);}#endif /* !HAVE_INET_ATON */