1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1989, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__SCCSID("@(#)devname.c	8.2 (Berkeley) 4/29/95");
34__FBSDID("$FreeBSD$");
35
36#include <sys/param.h>
37#include <sys/sysctl.h>
38
39#include <stdio.h>
40#include <stdint.h>
41#include <stdlib.h>
42#include <string.h>
43#include <sys/stat.h>
44
45char *
46devname_r(dev_t dev, mode_t type, char *buf, int len)
47{
48	int i;
49	size_t j;
50
51	if (dev == NODEV || !(S_ISCHR(type) || S_ISBLK(dev))) {
52		strlcpy(buf, "#NODEV", len);
53		return (buf);
54	}
55
56	if (S_ISCHR(type)) {
57		j = len;
58		i = sysctlbyname("kern.devname", buf, &j, &dev, sizeof (dev));
59		if (i == 0)
60			return (buf);
61	}
62
63	/* Finally just format it */
64	snprintf(buf, len, "#%c:%#jx",
65	    S_ISCHR(type) ? 'C' : 'B', (uintmax_t)dev);
66	return (buf);
67}
68
69char *
70devname(dev_t dev, mode_t type)
71{
72	static char buf[SPECNAMELEN + 1];
73
74	return (devname_r(dev, type, buf, sizeof(buf)));
75}
76