sys/lib/libkern/intoa.c

   1 /*      $NetBSD: intoa.c,v 1.2 2009/03/14 14:46:10 dsl 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 }