StdLib/BsdSocketLib/ns_ntoa.c

   1 /*
   2  * Copyright (c) 1986, 1993
   3  *  The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *  This product includes software developed by the University of
  16  *  California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #if defined(LIBC_SCCS) && !defined(lint)
  35 static char sccsid[] = "@(#)ns_ntoa.c 8.1 (Berkeley) 6/4/93";
  36 #endif /* LIBC_SCCS and not lint */
  37
  38 #include <sys/param.h>
  39 #include <netns/ns.h>
  40 #include <stdio.h>
  41
  42 static char *spectHex(char *p0);
  43
  44 char *
  45 ns_ntoa(
  46   struct ns_addr addr
  47   )
  48 {
  49   static char obuf[40];
  50   union { union ns_net net_e; u_long long_e; } net;
  51   u_short port = htons(addr.x_port);
  52   register char *cp;
  53   char *cp2;
  54   register u_char *up = addr.x_host.c_host;
  55   u_char *uplim = up + 6;
  56
  57   net.net_e = addr.x_net;
  58   sprintf(obuf, "%x", (UINT32)ntohl(net.long_e));
  59   cp = spectHex(obuf);
  60   cp2 = cp + 1;
  61   while (*up==0 && up < uplim) up++;
  62   if (up == uplim) {
  63     if (port) {
  64       sprintf(cp, ".0");
  65       cp += 2;
  66     }
  67   } else {
  68     sprintf(cp, ".%x", *up++);
  69     while (up < uplim) {
  70       while (*cp) cp++;
  71       sprintf(cp, "%02x", *up++);
  72     }
  73     cp = spectHex(cp2);
  74   }
  75   if (port) {
  76     sprintf(cp, ".%x", port);
  77     spectHex(cp + 1);
  78   }
  79   return (obuf);
  80 }
  81
  82 static char *
  83 spectHex(
  84   char *p0
  85   )
  86 {
  87   int ok = 0;
  88   int nonzero = 0;
  89   register char *p = p0;
  90   for (; *p; p++) switch (*p) {
  91
  92   case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
  93     *p += ('A' - 'a');
  94     /* fall into . . . */
  95   case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
  96     ok = 1;
  97   case '1': case '2': case '3': case '4': case '5':
  98   case '6': case '7': case '8': case '9':
  99     nonzero = 1;
 100   }
 101   if (nonzero && !ok) { *p++ = 'H'; *p = 0; }
 102   return (p);
 103 }