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 <netinet/ether.h>
30
31 #include <stdio.h>
32
ether_aton_r(const char * asc,ether_addr * addr)33 ether_addr* ether_aton_r(const char* asc, ether_addr* addr) {
34 int bytes[ETHER_ADDR_LEN], end;
35 int n = sscanf(asc, "%x:%x:%x:%x:%x:%x%n",
36 &bytes[0], &bytes[1], &bytes[2],
37 &bytes[3], &bytes[4], &bytes[5], &end);
38 if (n != ETHER_ADDR_LEN || asc[end] != '\0') return NULL;
39 for (int i = 0; i < ETHER_ADDR_LEN; i++) {
40 if (bytes[i] > 0xff) return NULL;
41 addr->ether_addr_octet[i] = bytes[i];
42 }
43 return addr;
44 }
45
ether_aton(const char * asc)46 struct ether_addr* ether_aton(const char* asc) {
47 static ether_addr addr;
48 return ether_aton_r(asc, &addr);
49 }
50
ether_ntoa_r(const ether_addr * addr,char * buf)51 char* ether_ntoa_r(const ether_addr* addr, char* buf) {
52 snprintf(buf, 18, "%02x:%02x:%02x:%02x:%02x:%02x",
53 addr->ether_addr_octet[0], addr->ether_addr_octet[1],
54 addr->ether_addr_octet[2], addr->ether_addr_octet[3],
55 addr->ether_addr_octet[4], addr->ether_addr_octet[5]);
56 return buf;
57 }
58
ether_ntoa(const ether_addr * addr)59 char* ether_ntoa(const ether_addr* addr) {
60 static char buf[18];
61 return ether_ntoa_r(addr, buf);
62 }
63