lib/libc/net/iso_addr.c

   1 /*      $NetBSD: iso_addr.c,v 1.15 2013/03/01 18:25:16 joerg 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 1.15 2013/03/01 18:25:16 joerg Exp $");
  38 #endif
  39 #endif /* LIBC_SCCS and not lint */
  40
  41 #include <sys/types.h>
  42
  43 #include <assert.h>
  44 #include <string.h>
  45
  46 struct iso_addr {
  47         uint8_t         isoa_len;       /* length (in bytes) */
  48         char            isoa_genaddr[20];       /* general opaque address */
  49 };
  50
  51 __BEGIN_DECLS
  52 struct iso_addr *iso_addr(const char *);
  53 char *iso_ntoa(const struct iso_addr *);
  54 __END_DECLS
  55
  56 /* States*/
  57 #define VIRGIN  0
  58 #define GOTONE  1
  59 #define GOTTWO  2
  60 /* Inputs */
  61 #define DIGIT   (4*0)
  62 #define END     (4*1)
  63 #define DELIM   (4*2)
  64
  65 struct iso_addr *
  66 iso_addr(const char *addr)
  67 {
  68         static struct iso_addr out_addr;
  69         register char *cp = out_addr.isoa_genaddr;
  70         char *cplim = cp + sizeof(out_addr.isoa_genaddr);
  71         register int byte = 0, state = VIRGIN;
  72         register int newaddr = 0;       /* pacify gcc */
  73
  74         _DIAGASSERT(addr != NULL);
  75
  76         (void)memset(&out_addr, 0, sizeof (out_addr));
  77         do {
  78                 if ((*addr >= '0') && (*addr <= '9')) {
  79                         newaddr = *addr - '0';
  80                 } else if ((*addr >= 'a') && (*addr <= 'f')) {
  81                         newaddr = *addr - 'a' + 10;
  82                 } else if ((*addr >= 'A') && (*addr <= 'F')) {
  83                         newaddr = *addr - 'A' + 10;
  84                 } else if (*addr == 0)
  85                         state |= END;
  86                 else
  87                         state |= DELIM;
  88                 addr++;
  89                 switch (state /* | INPUT */) {
  90                 case GOTTWO | DIGIT:
  91                         *cp++ = byte; /*FALLTHROUGH*/
  92                 case VIRGIN | DIGIT:
  93                         state = GOTONE; byte = newaddr; continue;
  94                 case GOTONE | DIGIT:
  95                         state = GOTTWO; byte = newaddr + (byte << 4); continue;
  96                 default: /* | DELIM */
  97                         state = VIRGIN; *cp++ = byte; byte = 0; continue;
  98                 case GOTONE | END:
  99                 case GOTTWO | END:
 100                         *cp++ = byte; /* FALLTHROUGH */
 101                 case VIRGIN | END:
 102                         break;
 103                 }
 104                 break;
 105         } while (cp < cplim);
 106         _DIAGASSERT(__type_fit(uint8_t, cp - out_addr.isoa_genaddr));
 107         out_addr.isoa_len = (uint8_t)(cp - out_addr.isoa_genaddr);
 108         return (&out_addr);
 109 }
 110
 111 static const char hexlist[16] = "0123456789abcdef";
 112
 113 char *
 114 iso_ntoa(const struct iso_addr *isoa)
 115 {
 116         static char obuf[64];
 117         char *out = obuf;
 118         size_t i;
 119         const u_char *in = (const u_char *)isoa->isoa_genaddr;
 120         const u_char *inlim = in + isoa->isoa_len;
 121
 122         _DIAGASSERT(isoa != NULL);
 123
 124         out[1] = 0;
 125         while (in < inlim) {
 126                 i = *in++;
 127                 *out++ = '.';
 128                 if (i > 0xf) {
 129                         out[1] = hexlist[i & 0xf];
 130                         i >>= 4;
 131                         out[0] = hexlist[i];
 132                         out += 2;
 133                 } else
 134                         *out++ = hexlist[i];
 135         }
 136         *out = 0;
 137         return(obuf + 1);
 138 }