lib/libc/net/iso_addr.c

   1 /*      $NetBSD: iso_addr.c,v 1.14 2012/03/20 17:44:18 matt Exp $       */
   2
   3 /*
   4  * Copyright (c) 1989, 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[] = "@(#)iso_addr.c  8.1 (Berkeley) 6/4/93";
  36 #else
  37 __RCSID("$NetBSD: iso_addr.c,v 1.14 2012/03/20 17:44:18 matt Exp $");
  38 #endif
  39 #endif /* LIBC_SCCS and not lint */
  40
  41 #include <sys/types.h>
  42 #include <netiso/iso.h>
  43
  44 #include <assert.h>
  45 #include <string.h>
  46
  47 /* States*/
  48 #define VIRGIN  0
  49 #define GOTONE  1
  50 #define GOTTWO  2
  51 /* Inputs */
  52 #define DIGIT   (4*0)
  53 #define END     (4*1)
  54 #define DELIM   (4*2)
  55
  56 struct iso_addr *
  57 iso_addr(const char *addr)
  58 {
  59         static struct iso_addr out_addr;
  60         register char *cp = out_addr.isoa_genaddr;
  61         char *cplim = cp + sizeof(out_addr.isoa_genaddr);
  62         register int byte = 0, state = VIRGIN;
  63         register int newaddr = 0;       /* pacify gcc */
  64
  65         _DIAGASSERT(addr != NULL);
  66
  67         (void)memset(&out_addr, 0, sizeof (out_addr));
  68         do {
  69                 if ((*addr >= '0') && (*addr <= '9')) {
  70                         newaddr = *addr - '0';
  71                 } else if ((*addr >= 'a') && (*addr <= 'f')) {
  72                         newaddr = *addr - 'a' + 10;
  73                 } else if ((*addr >= 'A') && (*addr <= 'F')) {
  74                         newaddr = *addr - 'A' + 10;
  75                 } else if (*addr == 0)
  76                         state |= END;
  77                 else
  78                         state |= DELIM;
  79                 addr++;
  80                 switch (state /* | INPUT */) {
  81                 case GOTTWO | DIGIT:
  82                         *cp++ = byte; /*FALLTHROUGH*/
  83                 case VIRGIN | DIGIT:
  84                         state = GOTONE; byte = newaddr; continue;
  85                 case GOTONE | DIGIT:
  86                         state = GOTTWO; byte = newaddr + (byte << 4); continue;
  87                 default: /* | DELIM */
  88                         state = VIRGIN; *cp++ = byte; byte = 0; continue;
  89                 case GOTONE | END:
  90                 case GOTTWO | END:
  91                         *cp++ = byte; /* FALLTHROUGH */
  92                 case VIRGIN | END:
  93                         break;
  94                 }
  95                 break;
  96         } while (cp < cplim);
  97         _DIAGASSERT(__type_fit(uint8_t, cp - out_addr.isoa_genaddr));
  98         out_addr.isoa_len = (uint8_t)(cp - out_addr.isoa_genaddr);
  99         return (&out_addr);
 100 }
 101
 102 static const char hexlist[16] = "0123456789abcdef";
 103
 104 char *
 105 iso_ntoa(const struct iso_addr *isoa)
 106 {
 107         static char obuf[64];
 108         char *out = obuf;
 109         size_t i;
 110         const u_char *in = (const u_char *)isoa->isoa_genaddr;
 111         const u_char *inlim = in + isoa->isoa_len;
 112
 113         _DIAGASSERT(isoa != NULL);
 114
 115         out[1] = 0;
 116         while (in < inlim) {
 117                 i = *in++;
 118                 *out++ = '.';
 119                 if (i > 0xf) {
 120                         out[1] = hexlist[i & 0xf];
 121                         i >>= 4;
 122                         out[0] = hexlist[i];
 123                         out += 2;
 124                 } else
 125                         *out++ = hexlist[i];
 126         }
 127         *out = 0;
 128         return(obuf + 1);
 129 }