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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