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 *
iso_addr(const char * 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 *
iso_ntoa(const struct iso_addr * isoa)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