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iso_addr.c revision 1.9 
      1 /*	$NetBSD: iso_addr.c,v 1.9 1999/09/16 11:45:15 lukem 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. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #if defined(LIBC_SCCS) && !defined(lint)
     38 #if 0
     39 static char sccsid[] = "@(#)iso_addr.c	8.1 (Berkeley) 6/4/93";
     40 #else
     41 __RCSID("$NetBSD: iso_addr.c,v 1.9 1999/09/16 11:45:15 lukem Exp $");
     42 #endif
     43 #endif /* LIBC_SCCS and not lint */
     44 
     45 #include <sys/types.h>
     46 #include <netiso/iso.h>
     47 
     48 #include <assert.h>
     49 #include <string.h>
     50 
     51 /* States*/
     52 #define VIRGIN	0
     53 #define GOTONE	1
     54 #define GOTTWO	2
     55 /* Inputs */
     56 #define	DIGIT	(4*0)
     57 #define	END	(4*1)
     58 #define DELIM	(4*2)
     59 
     60 struct iso_addr *
     61 iso_addr(addr)
     62 	register const char *addr;
     63 {
     64 	static struct iso_addr out_addr;
     65 	register char *cp = out_addr.isoa_genaddr;
     66 	char *cplim = cp + sizeof(out_addr.isoa_genaddr);
     67 	register int byte = 0, state = VIRGIN;
     68 	register int newaddr = 0;	/* pacify gcc */
     69 
     70 	_DIAGASSERT(addr != NULL);
     71 #ifdef _DIAGNOSTIC
     72 	if (addr == NULL)
     73 		return (NULL);
     74 #endif
     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 	out_addr.isoa_len = cp - out_addr.isoa_genaddr;
    107 	return (&out_addr);
    108 }
    109 
    110 static const char hexlist[16] = "0123456789abcdef";
    111 
    112 char *
    113 iso_ntoa(isoa)
    114 	const struct iso_addr *isoa;
    115 {
    116 	static char obuf[64];
    117 	register char *out = obuf;
    118 	register size_t i;
    119 	register u_char *in = (u_char *)isoa->isoa_genaddr;
    120 	u_char *inlim = in + isoa->isoa_len;
    121 
    122 	_DIAGASSERT(isoa != NULL);
    123 #ifdef _DIAGNOSTIC
    124 	if (isoa == NULL)
    125 		return (NULL);
    126 #endif
    127 
    128 	out[1] = 0;
    129 	while (in < inlim) {
    130 		i = *in++;
    131 		*out++ = '.';
    132 		if (i > 0xf) {
    133 			out[1] = hexlist[i & 0xf];
    134 			i >>= 4;
    135 			out[0] = hexlist[i];
    136 			out += 2;
    137 		} else
    138 			*out++ = hexlist[i];
    139 	}
    140 	*out = 0;
    141 	return(obuf + 1);
    142 }
    143