1/*	$NetBSD: devopen.c,v 1.5 2011/04/11 14:00:02 tsutsui Exp $	*/
2
3/*
4 * Copyright (c) 2001 Minoura Makoto
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/param.h>
30#include <sys/disklabel.h>
31#include <lib/libkern/libkern.h>
32#include <lib/libsa/stand.h>
33#include "libx68k.h"
34
35extern struct devspec devspec[]; /* defined in conf.c */
36int devopen_open_dir = 0;
37
38/*
39 * Parse a device spec.
40 *
41 * sd<unit><part>:<file>
42 *  unit - 0-7
43 *  part - a-p
44 */
45int
46devparse(const char *fname, int *dev, int *unit, int *part, char **file)
47{
48	char const *s;
49	int i;
50
51	s = fname;
52	for (i = 0; devspec[i].ds_name != 0; i++) {
53		if (strncmp (devspec[i].ds_name, s,
54			     strlen(devspec[i].ds_name)) == 0)
55			break;
56	}
57
58	if (devspec[i].ds_name == 0)
59		return ENODEV;
60	s += strlen(devspec[i].ds_name);
61	*dev = devspec[i].ds_dev;
62
63	if (devspec[i].ds_net) {
64		*unit = 0;
65		*part = 0;
66	} else {
67		*unit = *s++ - '0';
68		if (*unit < 0 || *unit > devspec[i].ds_maxunit)
69			/* bad unit */
70			return ENODEV;
71		*part = *s++ - 'a';
72		if (*part < 0 || *part > MAXPARTITIONS)
73			/* bad partition */
74			return ENODEV;
75	}
76
77	if (*s++ != ':')
78		return ENODEV;
79
80	if (*s == '/') {
81		s++;
82		if (devopen_open_dir && *s == 0)
83			s--;
84	}
85	*file = __UNCONST(s);
86
87	return 0;
88}
89
90int
91devopen(struct open_file *f, const char *fname, char **file)
92{
93	int error;
94	int dev, unit, part;
95	struct devsw *dp = &devsw[0];
96
97	error = devparse(fname, &dev, &unit, &part, file);
98	if (error)
99		return error;
100
101	dp = &devsw[dev];
102
103	if (dp->dv_open == NULL)
104		return ENODEV;
105
106	f->f_dev = dp;
107
108	if ((error = (*dp->dv_open)(f, unit, part)) == 0)
109		return 0;
110
111	return error;
112}
113