/* ARPA.C

  * 

  * Portions Copyright (c) 1997-1999 Nokia Corporation and/or its subsidiary(-ies).

  * All rights reserved.

  */

 /*

  * Implementation of the ARPA/INET.H functions, based on FreeBSD.

  */

 /*

  * 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. 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--

  */

 #include <stdio_r.h>

 #include <netdb_r.h>

 #include <ctype.h>

 #include <sys/types.h>

 #include <libc/netinet/in.h>

 #include <libc/arpa/inet.h>

 /**

 Ascii internet address interpretation routine.

 @return The value returned is in network order.

 @param cp ascii representation of an Internet address

 */

 EXPORT_C unsigned long inet_addr(const char *cp)

 {

         struct in_addr val;

         if (inet_aton(cp, &val))

                 return (val.s_addr);

         return (INADDR_NONE);

 }

 /**

 Check whether "cp" is a valid ascii representation

 of an Internet address and convert to a binary address.

 This replaces inet_addr, the return value from which

 cannot distinguish between failure and a local broadcast address.

 @return 1 if the address is valid, 0 if not.

 @param cp ascii representation of an Internet address

 @param addr internet address

 */

 EXPORT_C int inet_aton(const char* cp, struct in_addr* addr)

 {

         unsigned long val;

         int base, n;

         char c;

         unsigned int parts[4];

         unsigned int *pp = parts;

         c = *cp;

         for (;;) {

                 /*

                  * Collect number up to ``.''.

                  * Values are specified as for C:

                  * 0x=hex, 0=octal, isdigit=decimal.

                  */

                 if (!isdigit(c))

                         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);

 		                if (val > 0xff) /* Check 8-bit a, b, c */

 		                        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);

 }

 /*

  * Convert network-format internet address

  * to base 256 d.d.d.d representation.

  */

 EXPORT_C char* _inet_ntoa_r(struct _reent* rp, struct in_addr in)

 {

         unsigned char* p = (unsigned char *)∈

         _sprintf_r(rp, rp->_tmpnam, "%d.%d.%d.%d", p[0], p[1], p[2], p[3]);

         return rp->_tmpnam;

 }

 #ifndef _REENT_ONLY

 EXPORT_C char* inet_ntoa(struct in_addr in)

 {

 	return _inet_ntoa_r(_REENT,in);

 }

 #endif /* _REENT_ONLY */

 /**

 Return the local network address portion of an

 internet address; handles class a/b/c network

 number formats.

 @return the local network address portion of an

 internet address

 @param in 

 */ 

 EXPORT_C unsigned long inet_lnaof(struct in_addr in)

 {

         register unsigned long i = ntohl(in.s_addr);

         if (IN_CLASSA(i))

                 return ((i)&IN_CLASSA_HOST);

         else if (IN_CLASSB(i))

                 return ((i)&IN_CLASSB_HOST);

         else

                 return ((i)&IN_CLASSC_HOST);

 }

 /**

 @return the network number from an internet

 address; handles class a/b/c network #'s.

 @param in

 */

 EXPORT_C unsigned long inet_netof(struct in_addr in)

 {

         unsigned long i = ntohl(in.s_addr);

         if (IN_CLASSA(i))

                 return (((i)&IN_CLASSA_NET) >> IN_CLASSA_NSHIFT);

         else if (IN_CLASSB(i))

                 return (((i)&IN_CLASSB_NET) >> IN_CLASSB_NSHIFT);

         else

                 return (((i)&IN_CLASSC_NET) >> IN_CLASSC_NSHIFT);

 }

 /** Formulate an Internet address from network + host.

 */

 EXPORT_C struct in_addr inet_makeaddr(unsigned long net, unsigned long host)

 {

         unsigned long addr;

         if (net < IN_CLASSA_MAX)

                 addr = (net << IN_CLASSA_NSHIFT) | (host & IN_CLASSA_HOST);

         else if (net < IN_CLASSB_MAX)

                 addr = (net << IN_CLASSB_NSHIFT) | (host & IN_CLASSB_HOST);

         else if (net < IN_CLASSC_MAX)

                 addr = (net << IN_CLASSC_NSHIFT) | (host & IN_CLASSC_HOST);

         else

                 addr = net | host;

         addr = htonl(addr);

         return (*(struct in_addr *)&addr);

 }