Merge from vendor branch BZIP:
[dragonfly.git] / lib / libc / gen / devname.c
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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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * $FreeBSD: src/lib/libc/gen/devname.c,v 1.2.2.2 2001/07/31 20:10:19 tmm Exp $
af47226a 34 * $DragonFly: src/lib/libc/gen/devname.c,v 1.6 2005/04/26 16:59:56 joerg Exp $
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35 *
36 * @(#)devname.c 8.2 (Berkeley) 4/29/95
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37 */
38
984263bc 39#include <sys/types.h>
af47226a 40#include <sys/stat.h>
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41
42#include <db.h>
43#include <err.h>
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44#include <fcntl.h>
45#include <paths.h>
46#include <stdio.h>
af47226a 47#include <stdlib.h>
984263bc 48#include <string.h>
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49
50static char *
d837ed52 51xdevname(dev_t dev, mode_t type)
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52{
53 struct {
54 mode_t type;
55 dev_t dev;
56 } bkey;
57 static DB *db;
58 static int failure;
59 DBT data, key;
60
61 if (!db && !failure &&
62 !(db = dbopen(_PATH_DEVDB, O_RDONLY, 0, DB_HASH, NULL))) {
63 warn("warning: %s", _PATH_DEVDB);
64 failure = 1;
65 }
66 if (failure)
67 return (NULL);
68
69 /*
70 * Keys are a mode_t followed by a dev_t. The former is the type of
71 * the file (mode & S_IFMT), the latter is the st_rdev field. Be
72 * sure to clear any padding that may be found in bkey.
73 */
74 memset(&bkey, 0, sizeof(bkey));
75 bkey.dev = dev;
76 bkey.type = type;
77 key.data = &bkey;
78 key.size = sizeof(bkey);
79 return ((db->get)(db, &key, &data, 0) ? NULL : (char *)data.data);
80}
81
82char *
3a27c382 83devname_r(dev_t dev, mode_t type, char *buf, size_t len)
984263bc 84{
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85 char *r;
86
87 /* First check the DB file. */
88 r = xdevname(dev, type);
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89 if (r != NULL) {
90 strlcpy(buf, r, len);
91 return (buf);
92 }
984263bc 93
984263bc 94 /* Finally just format it */
984263bc 95 if (minor(dev) > 255) {
3a27c382 96 snprintf(buf, len, "#%c%d:0x%x",
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97 (type & S_IFMT) == S_IFCHR ? 'C' : 'B',
98 major(dev), minor(dev));
99 } else {
3a27c382 100 snprintf(buf, len, "#%c%d:%d",
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101 (type & S_IFMT) == S_IFCHR ? 'C' : 'B',
102 major(dev), minor(dev));
103 }
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104 return (buf);
105}
106
107char *
108devname(dev_t dev, mode_t type)
109{
110 static char buf[30]; /* XXX: pick up from <sys/conf.h> */
111
af47226a 112 strlcpy(buf, devname_r(dev, type, buf, sizeof(buf)), sizeof(buf));
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113
114 return (buf);
984263bc 115}