1 /* $NetBSD: opendisk.c,v 1.14 2016/06/06 17:50:19 christos Exp $ */
2
3 /*-
4 * Copyright (c) 1997 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Luke Mewburn.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #if HAVE_NBTOOL_CONFIG_H
33 #include "nbtool_config.h"
34 #endif
35
36 #include <sys/cdefs.h>
37 #if defined(LIBC_SCCS) && !defined(lint)
38 __RCSID("$NetBSD: opendisk.c,v 1.14 2016/06/06 17:50:19 christos Exp $");
39 #endif
40
41 #include <sys/param.h>
42
43 #include <assert.h>
44 #include <errno.h>
45 #include <stdarg.h>
46 #include <fcntl.h>
47 #ifndef HAVE_NBTOOL_CONFIG_H
48 #include <util.h>
49 #include <paths.h>
50 #else
51 #include "opendisk.h"
52 #endif
53 #include <stdio.h>
54 #include <string.h>
55
56 static int __printflike(5, 6)
opd(char * buf,size_t len,int (* ofn)(const char *,int,...),int flags,const char * fmt,...)57 opd(char *buf, size_t len, int (*ofn)(const char *, int, ...),
58 int flags, const char *fmt, ...)
59 {
60 va_list ap;
61
62 va_start(ap, fmt);
63 vsnprintf(buf, len, fmt, ap);
64 va_end(ap);
65
66 return (*ofn)(buf, flags, 0);
67 }
68
69 static int
__opendisk(const char * path,int flags,char * buf,size_t buflen,int iscooked,int (* ofn)(const char *,int,...))70 __opendisk(const char *path, int flags, char *buf, size_t buflen, int iscooked,
71 int (*ofn)(const char *, int, ...))
72 {
73 int f, part;
74
75 if (buf == NULL) {
76 errno = EFAULT;
77 return -1;
78 }
79
80 if ((flags & O_CREAT) != 0) {
81 errno = EINVAL;
82 return -1;
83 }
84
85 part = getrawpartition();
86 if (part < 0)
87 return -1; /* sysctl(3) in getrawpartition sets errno */
88 part += 'a';
89
90 /*
91 * If we are passed a plain name, first try /dev to avoid accidents
92 * with files in the same directory that happen to match disk names.
93 */
94 if (strchr(path, '/') == NULL) {
95 const char *r = iscooked ? "" : "r";
96 const char *d = _PATH_DEV;
97
98 f = opd(buf, buflen, ofn, flags, "%s%s%s", d, r, path);
99 if (f != -1 || errno != ENOENT)
100 return f;
101
102 f = opd(buf, buflen, ofn, flags, "%s%s%s%c", d, r, path, part);
103 if (f != -1 || errno != ENOENT)
104 return f;
105 }
106
107 f = opd(buf, buflen, ofn, flags, "%s", path);
108 if (f != -1 || errno != ENOENT)
109 return f;
110
111 return opd(buf, buflen, ofn, flags, "%s%c", path, part);
112 }
113
114 int
opendisk(const char * path,int flags,char * buf,size_t buflen,int iscooked)115 opendisk(const char *path, int flags, char *buf, size_t buflen, int iscooked)
116 {
117
118 return __opendisk(path, flags, buf, buflen, iscooked, open);
119 }
120
121 int
opendisk1(const char * path,int flags,char * buf,size_t buflen,int iscooked,int (* ofn)(const char *,int,...))122 opendisk1(const char *path, int flags, char *buf, size_t buflen, int iscooked,
123 int (*ofn)(const char *, int, ...))
124 {
125
126 return __opendisk(path, flags, buf, buflen, iscooked, ofn);
127 }
128