1 /* $NetBSD: opendisk.c,v 1.13 2014/09/29 21:04:52 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 1.13 2014/09/29 21:04:52 christos Exp $");
39 #endif
40
41 #include <sys/param.h>
42
43 #include <assert.h>
44 #include <errno.h>
45 #include <fcntl.h>
46 #ifndef HAVE_NBTOOL_CONFIG_H
47 #include <util.h>
48 #include <paths.h>
49 #else
50 #include "opendisk.h"
51 #endif
52 #include <stdio.h>
53 #include <string.h>
54
55 static int
__opendisk(const char * path,int flags,char * buf,size_t buflen,int iscooked,int (* ofn)(const char *,int,...))56 __opendisk(const char *path, int flags, char *buf, size_t buflen, int iscooked,
57 int (*ofn)(const char *, int, ...))
58 {
59 #if !defined(__minix)
60 int f, rawpart;
61 #else
62 int f;
63 #endif /* !defined(__minix) */
64
65 #if defined(__minix)
66 /*
67 * MINIX does not have the cooked/raw distinction. Do not prepend 'r'
68 * to the device name when generating a full path.
69 */
70 iscooked = 1;
71 #endif /* defined(__minix) */
72
73 if (buf == NULL) {
74 errno = EFAULT;
75 return (-1);
76 }
77 snprintf(buf, buflen, "%s", path);
78
79 if ((flags & O_CREAT) != 0) {
80 errno = EINVAL;
81 return (-1);
82 }
83
84 #if !defined(__minix)
85 rawpart = getrawpartition();
86 if (rawpart < 0)
87 return (-1); /* sysctl(3) in getrawpartition sets errno */
88 #endif /* !defined(__minix) */
89
90 f = ofn(buf, flags, 0);
91 if (f != -1 || errno != ENOENT)
92 return (f);
93
94 #if !defined(__minix)
95 snprintf(buf, buflen, "%s%c", path, 'a' + rawpart);
96 f = ofn(buf, flags, 0);
97 if (f != -1 || errno != ENOENT)
98 return (f);
99 #endif /* !defined(__minix) */
100
101 if (strchr(path, '/') != NULL)
102 return (-1);
103
104 snprintf(buf, buflen, "%s%s%s", _PATH_DEV, iscooked ? "" : "r", path);
105 f = ofn(buf, flags, 0);
106 if (f != -1 || errno != ENOENT)
107 return (f);
108
109 #if !defined(__minix)
110 snprintf(buf, buflen, "%s%s%s%c", _PATH_DEV, iscooked ? "" : "r", path,
111 'a' + rawpart);
112 f = ofn(buf, flags, 0);
113 #endif /* !defined(__minix) */
114 return (f);
115 }
116
117 int
opendisk(const char * path,int flags,char * buf,size_t buflen,int iscooked)118 opendisk(const char *path, int flags, char *buf, size_t buflen, int iscooked)
119 {
120
121 return __opendisk(path, flags, buf, buflen, iscooked, open);
122 }
123
124 int
opendisk1(const char * path,int flags,char * buf,size_t buflen,int iscooked,int (* ofn)(const char *,int,...))125 opendisk1(const char *path, int flags, char *buf, size_t buflen, int iscooked,
126 int (*ofn)(const char *, int, ...))
127 {
128
129 return __opendisk(path, flags, buf, buflen, iscooked, ofn);
130 }
131