1 /* $OpenBSD: opendisk.c,v 1.3 2004/05/28 07:03:47 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 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by the NetBSD
22 * Foundation, Inc. and its contributors.
23 * 4. Neither the name of The NetBSD Foundation nor the names of its
24 * contributors may be used to endorse or promote products derived
25 * from this software without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37 * POSSIBILITY OF SUCH DAMAGE.
38 */
39
40 #include <sys/cdefs.h>
41 #include <sys/param.h>
42
43 #include <errno.h>
44 #include <fcntl.h>
45 #include <paths.h>
46 #include <stdio.h>
47 #include <string.h>
48
49 #include "util.h"
50
51 int
opendisk(const char * path,int flags,char * buf,size_t buflen,int iscooked)52 opendisk(const char *path, int flags, char *buf, size_t buflen, int iscooked)
53 {
54 int f, rawpart;
55
56 if (buf == NULL) {
57 errno = EFAULT;
58 return (-1);
59 }
60 snprintf(buf, buflen, "%s", path);
61
62 if ((flags & O_CREAT) != 0) {
63 errno = EINVAL;
64 return (-1);
65 }
66
67 rawpart = getrawpartition();
68 if (rawpart < 0)
69 return (-1); /* sysctl(3) in getrawpartition sets errno */
70
71 f = open(buf, flags);
72 if (f != -1 || errno != ENOENT)
73 return (f);
74
75 snprintf(buf, buflen, "%s%c", path, 'a' + rawpart);
76 f = open(buf, flags);
77 if (f != -1 || errno != ENOENT)
78 return (f);
79
80 if (strchr(path, '/') != NULL)
81 return (-1);
82
83 snprintf(buf, buflen, "%s%s%s", _PATH_DEV, iscooked ? "" : "r", path);
84 f = open(buf, flags);
85 if (f != -1 || errno != ENOENT)
86 return (f);
87
88 snprintf(buf, buflen, "%s%s%s%c", _PATH_DEV, iscooked ? "" : "r", path,
89 'a' + rawpart);
90 f = open(buf, flags);
91 return (f);
92 }
93