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