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
35static inline int
36xdigit (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 */
52struct ether_addr *
53ether_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 */
84struct ether_addr *
85ether_aton (const char *asc)
86{
87    static struct ether_addr addr;
88    return ether_aton_r(asc, &addr);
89}
90