lib/libc/net/iso_addr.c

   1 /*
   2  * Copyright (c) 1989, 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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)iso_addr.c       8.1 (Berkeley) 6/4/93
  30  * $DragonFly: src/lib/libc/net/iso_addr.c,v 1.4 2005/09/19 09:34:53 asmodai Exp $
  31  */
  32
  33 #include <sys/types.h>
  34 #include <netiso/iso.h>
  35 #include <string.h>
  36
  37 /* States*/
  38 #define VIRGIN  0
  39 #define GOTONE  1
  40 #define GOTTWO  2
  41 /* Inputs */
  42 #define DIGIT   (4*0)
  43 #define END     (4*1)
  44 #define DELIM   (4*2)
  45
  46 struct iso_addr *
  47 iso_addr(addr)
  48         const char *addr;
  49 {
  50         static struct iso_addr out_addr;
  51         char *cp = out_addr.isoa_genaddr;
  52         char *cplim = cp + sizeof(out_addr.isoa_genaddr);
  53         int byte = 0, state = VIRGIN, new;
  54
  55         bzero((char *)&out_addr, sizeof(out_addr));
  56         do {
  57                 if ((*addr >= '0') && (*addr <= '9')) {
  58                         new = *addr - '0';
  59                 } else if ((*addr >= 'a') && (*addr <= 'f')) {
  60                         new = *addr - 'a' + 10;
  61                 } else if ((*addr >= 'A') && (*addr <= 'F')) {
  62                         new = *addr - 'A' + 10;
  63                 } else if (*addr == 0)
  64                         state |= END;
  65                 else
  66                         state |= DELIM;
  67                 addr++;
  68                 switch (state /* | INPUT */) {
  69                 case GOTTWO | DIGIT:
  70                         *cp++ = byte; /*FALLTHROUGH*/
  71                 case VIRGIN | DIGIT:
  72                         state = GOTONE; byte = new; continue;
  73                 case GOTONE | DIGIT:
  74                         state = GOTTWO; byte = new + (byte << 4); continue;
  75                 default: /* | DELIM */
  76                         state = VIRGIN; *cp++ = byte; byte = 0; continue;
  77                 case GOTONE | END:
  78                 case GOTTWO | END:
  79                         *cp++ = byte; /* FALLTHROUGH */
  80                 case VIRGIN | END:
  81                         break;
  82                 }
  83                 break;
  84         } while (cp < cplim);
  85         out_addr.isoa_len = cp - out_addr.isoa_genaddr;
  86         return (&out_addr);
  87 }
  88
  89 static char hexlist[] = "0123456789abcdef";
  90
  91 char *
  92 iso_ntoa(isoa)
  93         const struct iso_addr *isoa;
  94 {
  95         static char tmpbuf[sizeof(isoa->isoa_genaddr)*3];
  96         const u_char *binary;
  97         char *cp;
  98         int i;
  99
 100         binary = isoa->isoa_genaddr;
 101         cp = tmpbuf;
 102
 103         for (i = 0; i < isoa->isoa_len; i++) {
 104                 *cp++ = hexlist[*binary >> 4];
 105                 *cp++ = hexlist[*binary++ & 0xf];
 106
 107                 if ((((i % 2) == 0) && ((i + 1) < isoa->isoa_len)))
 108                         *cp++ = '.';
 109         }
 110         *cp = '\0';
 111         return tmpbuf;
 112 }