1 /* $OpenBSD: opendisk.c,v 1.7 2014/06/30 00:26:22 deraadt Exp $ */
2 /* $NetBSD: opendisk.c,v 1.4 1997/09/30 17:13:50 phil Exp $ */
3
4 /*-
5 * Copyright (c) 1997 The NetBSD Foundation, Inc.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to The NetBSD Foundation
9 * by Luke Mewburn.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #include <sys/types.h>
34
35 #include <errno.h>
36 #include <fcntl.h>
37 #include <paths.h>
38 #include <stdio.h>
39 #include <string.h>
40
41 #include "util.h"
42
43 int
opendisk(const char * path,int flags,char * buf,size_t buflen,int iscooked)44 opendisk(const char *path, int flags, char *buf, size_t buflen, int iscooked)
45 {
46 int f, rawpart;
47
48 snprintf(buf, buflen, "%s", path);
49
50 if ((flags & O_CREAT) != 0) {
51 errno = EINVAL;
52 return (-1);
53 }
54
55 rawpart = getrawpartition();
56 if (rawpart < 0)
57 return (-1); /* sysctl(3) in getrawpartition sets errno */
58
59 f = open(buf, flags);
60 if (f != -1 || errno != ENOENT)
61 return (f);
62
63 snprintf(buf, buflen, "%s%c", path, 'a' + rawpart);
64 f = open(buf, flags);
65 if (f != -1 || errno != ENOENT)
66 return (f);
67
68 if (strchr(path, '/') != NULL)
69 return (-1);
70
71 snprintf(buf, buflen, "%s%s%s", _PATH_DEV, iscooked ? "" : "r", path);
72 f = open(buf, flags);
73 if (f != -1 || errno != ENOENT)
74 return (f);
75
76 snprintf(buf, buflen, "%s%s%s%c", _PATH_DEV, iscooked ? "" : "r", path,
77 'a' + rawpart);
78 f = open(buf, flags);
79 return (f);
80 }
81