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intoa.c revision 1.1.156.1 
      1 /*	$NetBSD: intoa.c,v 1.1.156.1 2009/05/13 17:22:15 jym Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1992 Regents of the University of California.
      5  * All rights reserved.
      6  *
      7  * This software was developed by the Computer Systems Engineering group
      8  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
      9  * contributed to Berkeley.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  * 3. All advertising materials mentioning features or use of this software
     20  *    must display the following acknowledgement:
     21  *	This product includes software developed by the University of
     22  *	California, Lawrence Berkeley Laboratory and its contributors.
     23  * 4. Neither the name of the University nor the names of its contributors
     24  *    may be used to endorse or promote products derived from this software
     25  *    without specific prior written permission.
     26  *
     27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     37  * SUCH DAMAGE.
     38  *
     39  * @(#) Header: net.c,v 1.9 93/08/06 19:32:15 leres Exp  (LBL)
     40  */
     41 
     42 #include <sys/types.h>
     43 
     44 #if defined(_KERNEL) || defined(_STANDALONE)
     45 #include <lib/libkern/libkern.h>
     46 #else
     47 char *intoa(u_int32_t); /* XXX */
     48 #endif
     49 
     50 /* Similar to inet_ntoa() */
     51 char *
     52 intoa(u_int32_t addr)
     53 {
     54 	char *cp;
     55 	u_int byte;
     56 	int n;
     57 	static char buf[17];	/* strlen(".255.255.255.255") + 1 */
     58 
     59 	addr = ntohl(addr);
     60 	cp = &buf[sizeof buf];
     61 	*--cp = '\0';
     62 
     63 	n = 4;
     64 	do {
     65 		byte = addr & 0xff;
     66 		*--cp = byte % 10 + '0';
     67 		byte /= 10;
     68 		if (byte > 0) {
     69 			*--cp = byte % 10 + '0';
     70 			byte /= 10;
     71 			if (byte > 0)
     72 				*--cp = byte + '0';
     73 		}
     74 		*--cp = '.';
     75 		addr >>= 8;
     76 	} while (--n > 0);
     77 
     78 	return (cp+1);
     79 }
     80