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
56static int __printflike(5, 6)
57opd(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
69static 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
114int
115opendisk(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
121int
122opendisk1(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