Home | History | Annotate | Line # | Download | only in net 
      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 }
    139