1 /*
2 * Copyright (c) 2018 The strace developers.
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 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include "defs.h"
29
30 #include "error_prints.h"
31 #include "xstring.h"
32
33 #ifndef MAX_ADDR_LEN
34 # define MAX_ADDR_LEN 32
35 #endif
36
37 const char *
sprint_mac_addr(const uint8_t addr[],size_t size)38 sprint_mac_addr(const uint8_t addr[], size_t size)
39 {
40 static char res[MAX_ADDR_LEN * 3];
41
42 if (size > MAX_ADDR_LEN) {
43 error_func_msg("Address size (%zu) is more than maximum "
44 "supported (%u)", size, MAX_ADDR_LEN);
45
46 return NULL;
47 }
48
49 char *ptr = res;
50
51 for (size_t i = 0; i < size; i++)
52 ptr = xappendstr(res, ptr, "%s%02x", i ? ":" : "", addr[i]);
53
54 return res;
55 }
56