1/*	$NetBSD: devopen.c,v 1.8 2023/02/12 08:25:09 tsutsui Exp $	*/
2/*
3 * Copyright (c) 1994 Rolf Grossmann
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 *    must display the following acknowledgement:
16 *      This product includes software developed by Rolf Grossmann.
17 * 4. The name of the author may not be used to endorse or promote products
18 *    derived from this software without specific prior written permission
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <lib/libsa/stand.h>
33#include <lib/libkern/libkern.h>
34
35int devlookup(const char *, int);
36int devparse(const char *, int *, int *, int *, int *, char **);
37
38int
39devlookup(const char *d, int len)
40{
41    struct devsw *dp = devsw;
42    int i;
43
44    for (i = 0; i < ndevs; i++, dp++)
45	if (dp->dv_name && strncmp(dp->dv_name, d, len) == 0)
46	    return i;
47
48    for (i = 0; i < len; i++)
49	printf("%c", d[i]);
50    printf(": no such device - Configured devices are:\n");
51    for (dp = devsw, i = 0; i < ndevs; i++, dp++)
52	if (dp->dv_name && (void *)dp->dv_open != (void *)nodev)
53	    printf(" %s", dp->dv_name);
54    printf("\n");
55    errno = ENXIO;
56    return -1;
57}
58
59/*
60 * Parse a device spec.
61 *
62 * Format:
63 *   dev(count, lun, part)file
64 */
65int
66devparse(const char *fname, int *dev,
67	 int *count, int *lun, int *part, char **file)
68{
69    int i;
70    const char *s, *args[3];
71
72    /* get device name */
73    for (s = fname; *s && *s != '/' && *s != '('; s++)
74	;
75
76    if (*s == '(') {
77	/* lookup device and get index */
78	if ((*dev = devlookup(fname, s - fname)) < 0)
79	    goto baddev;
80
81	/* tokenize device ident */
82	args[0] = ++s;
83	for (i = 1; *s && *s != ')' && i<3; s++) {
84	    if (*s == ',')
85		args[i++] = ++s;
86	}
87	if (*s != ')')
88	    goto baddev;
89
90	switch(i) {
91	  case 3:
92	      *count  = atoi(args[0]);
93	      *lun  = atoi(args[1]);
94	      *part  = atoi(args[2]);
95	      break;
96	  case 2:
97	      *lun  = atoi(args[0]);
98	      *part  = atoi(args[1]);
99	      break;
100	  case 1:
101	      *part  = atoi(args[0]);
102	      break;
103	  case 0:
104	      break;
105	}
106	*file = (char *)++s;	/* XXX discard const */
107    }
108    /* no device present */
109    else
110	*file = (char *)fname;	/* XXX discard const */
111
112    return 0;
113
114baddev:
115    return ENXIO;
116}
117
118int
119devopen(struct open_file *f, const char *fname, char **file)
120{
121    int error;
122    int dev;
123    int count, lun, part;
124    struct devsw *dp;
125
126    dev   = 0;	/* default device is first in table (usually scsi disk) */
127    count = 0;
128    lun   = 0;
129    part  = 0;
130
131    if ((error = devparse(fname, &dev, &count, &lun, &part, file)) != 0)
132	return error;
133
134    dp = &devsw[dev];
135
136    if ((void *)dp->dv_open == (void *)nodev)
137	return ENXIO;
138
139    f->f_dev = dp;
140
141    if ((error = (*dp->dv_open)(f, count, lun, part)) != 0)
142	printf("%s(%d,%d,%d): %d = %s\n", devsw[dev].dv_name,
143	       count, lun, part, error, strerror(error));
144
145    return error;
146}
147