1 /*
2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. 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 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #if defined(LIBC_SCCS) && !defined(lint)
31 static char sccsid[] = "@(#)devname.c 8.2 (Berkeley) 4/29/95";
32 #endif /* LIBC_SCCS and not lint */
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
35
36 #include <sys/types.h>
37 #include <sys/sysctl.h>
38
39 #include <stdio.h>
40 #include <stdint.h>
41 #include <string.h>
42 #include <sys/param.h>
43 #include <sys/stat.h>
44
45 char *
devname_r(dev_t dev,mode_t type,char * buf,int len)46 devname_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
69 char *
devname(dev_t dev,mode_t type)70 devname(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