1 /*
2 * Copyright (C) 2010 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <sys/types.h>
32 #include <net/if_ether.h>
33 #include <ctype.h>
34
35 static inline int
xdigit(char c)36 xdigit (char c) {
37 unsigned d;
38 d = (unsigned)(c-'0');
39 if (d < 10) return (int)d;
40 d = (unsigned)(c-'a');
41 if (d < 6) return (int)(10+d);
42 d = (unsigned)(c-'A');
43 if (d < 6) return (int)(10+d);
44 return -1;
45 }
46
47 /*
48 * Convert Ethernet address in the standard hex-digits-and-colons to binary
49 * representation.
50 * Re-entrant version (GNU extensions)
51 */
52 struct ether_addr *
ether_aton_r(const char * asc,struct ether_addr * addr)53 ether_aton_r (const char *asc, struct ether_addr * addr)
54 {
55 int i, val0, val1;
56 for (i = 0; i < ETHER_ADDR_LEN; ++i) {
57 val0 = xdigit(*asc);
58 asc++;
59 if (val0 < 0)
60 return NULL;
61
62 val1 = xdigit(*asc);
63 asc++;
64 if (val1 < 0)
65 return NULL;
66
67 addr->ether_addr_octet[i] = (u_int8_t)((val0 << 4) + val1);
68
69 if (i < ETHER_ADDR_LEN - 1) {
70 if (*asc != ':')
71 return NULL;
72 asc++;
73 }
74 }
75 if (*asc != '\0')
76 return NULL;
77 return addr;
78 }
79
80 /*
81 * Convert Ethernet address in the standard hex-digits-and-colons to binary
82 * representation.
83 */
84 struct ether_addr *
ether_aton(const char * asc)85 ether_aton (const char *asc)
86 {
87 static struct ether_addr addr;
88 return ether_aton_r(asc, &addr);
89 }
90