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 #include <sys/param.h>
35 #include <sys/sysctl.h>
36
37 #include <stdio.h>
38 #include <stdint.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <sys/stat.h>
42
43 char *
devname_r(dev_t dev,mode_t type,char * buf,int len)44 devname_r(dev_t dev, mode_t type, char *buf, int len)
45 {
46 int i;
47 size_t j;
48
49 if (dev == NODEV || !(S_ISCHR(type) || S_ISBLK(type))) {
50 strlcpy(buf, "#NODEV", len);
51 return (buf);
52 }
53
54 if (S_ISCHR(type)) {
55 j = len;
56 i = sysctlbyname("kern.devname", buf, &j, &dev, sizeof (dev));
57 if (i == 0)
58 return (buf);
59 }
60
61 /* Finally just format it */
62 snprintf(buf, len, "#%c:%#jx",
63 S_ISCHR(type) ? 'C' : 'B', (uintmax_t)dev);
64 return (buf);
65 }
66
67 char *
devname(dev_t dev,mode_t type)68 devname(dev_t dev, mode_t type)
69 {
70 static char buf[SPECNAMELEN + 1];
71
72 return (devname_r(dev, type, buf, sizeof(buf)));
73 }
74