lib/libc/compat/net/compat_ns_ntoa.c

   1 /*      $NetBSD: compat_ns_ntoa.c,v 1.2 2012/03/20 17:05:59 matt Exp $  */
   2
   3 /*
   4  * Copyright (c) 1986, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #if defined(LIBC_SCCS) && !defined(lint)
  34 #if 0
  35 static char sccsid[] = "@(#)ns_ntoa.c   8.1 (Berkeley) 6/4/93";
  36 #else
  37 __RCSID("$NetBSD: compat_ns_ntoa.c,v 1.2 2012/03/20 17:05:59 matt Exp $");
  38 #endif
  39 #endif /* LIBC_SCCS and not lint */
  40
  41 #include <sys/param.h>
  42 #include <compat/include/ns.h>
  43
  44 #include <assert.h>
  45 #include <stdio.h>
  46
  47 static char *spectHex(char *);
  48
  49 char *
  50 ns_ntoa(struct ns_addr addr)
  51 {
  52         static char obuf[40];
  53         union { union ns_net net_e; uint32_t long_e; } net;
  54         uint16_t port = htons(addr.x_port);
  55         char *cp;
  56         char *cp2;
  57         uint8_t *up = addr.x_host.c_host;
  58         uint8_t *uplim = up + 6;
  59
  60         net.net_e = addr.x_net;
  61         sprintf(obuf, "%x", ntohl(net.long_e));
  62         cp = spectHex(obuf);
  63         cp2 = cp + 1;
  64         while (up < uplim && *up==0)
  65                 up++;
  66         if (up == uplim) {
  67                 if (port) {
  68                         sprintf(cp, ".0");
  69                         cp += 2;
  70                 }
  71         } else {
  72                 sprintf(cp, ".%x", *up++);
  73                 while (up < uplim) {
  74                         while (*cp) cp++;
  75                         sprintf(cp, "%02x", *up++);
  76                 }
  77                 cp = spectHex(cp2);
  78         }
  79         if (port) {
  80                 sprintf(cp, ".%x", port);
  81                 spectHex(cp + 1);
  82         }
  83         return (obuf);
  84 }
  85
  86 static char *
  87 spectHex(char *p0)
  88 {
  89         int ok = 0;
  90         int nonzero = 0;
  91         char *p = p0;
  92
  93         _DIAGASSERT(p0 != NULL);
  94
  95         for (; *p; p++)
  96                 switch (*p) {
  97                 case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
  98                         *p += ('A' - 'a');
  99                         /* FALLTHROUGH */
 100                 case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
 101                         ok = 1;
 102                         /* FALLTHROUGH */
 103                 case '1': case '2': case '3': case '4': case '5':
 104                 case '6': case '7': case '8': case '9':
 105                         nonzero = 1;
 106                 }
 107         if (nonzero && !ok) { *p++ = 'H'; *p = 0; }
 108         return (p);
 109 }