1/*	$NetBSD: devopen.c,v 1.2.42.2 2005/11/10 13:57:58 skrll 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 atoi(const char *);
36int devlookup(const char *, int);
37int devparse(const char *, int *, char *, char *, char *, char **);
38
39int
40atoi(const char *cp)
41{
42    int val = 0;
43
44    while(isdigit((unsigned char)*cp))
45	val = val * 10 + (*cp++ - '0');
46    return val;
47}
48
49int
50devlookup(const char *d, int len)
51{
52    struct devsw *dp = devsw;
53    int i;
54
55    for (i = 0; i < ndevs; i++, dp++)
56	if (dp->dv_name && strncmp(dp->dv_name, d, len) == 0)
57	    return i;
58
59    for (i = 0; i < len; i++)
60	printf("%c", d[i]);
61    printf(": no such device - Configured devices are:\n");
62    for (dp = devsw, i = 0; i < ndevs; i++, dp++)
63	if (dp->dv_name && (void *)dp->dv_open != (void *)nodev)
64	    printf(" %s", dp->dv_name);
65    printf("\n");
66    errno = ENXIO;
67    return -1;
68}
69
70/*
71 * Parse a device spec.
72 *
73 * Format:
74 *   dev(count, lun, part)file
75 */
76int
77devparse(const char *fname, int *dev,
78	 char *count, char *lun, char *part, char **file)
79{
80    int i;
81    const char *s, *args[3];
82
83    /* get device name */
84    for (s = fname; *s && *s != '/' && *s != '('; s++)
85	;
86
87    if (*s == '(') {
88	/* lookup device and get index */
89	if ((*dev = devlookup(fname, s - fname)) < 0)
90	    goto baddev;
91
92	/* tokenize device ident */
93	args[0] = ++s;
94	for (i = 1; *s && *s != ')' && i<3; s++) {
95	    if (*s == ',')
96		args[i++] = ++s;
97	}
98	if (*s != ')')
99	    goto baddev;
100
101	switch(i) {
102	  case 3:
103	      *count  = atoi(args[0]);
104	      *lun  = atoi(args[1]);
105	      *part  = atoi(args[2]);
106	      break;
107	  case 2:
108	      *lun  = atoi(args[0]);
109	      *part  = atoi(args[1]);
110	      break;
111	  case 1:
112	      *part  = atoi(args[0]);
113	      break;
114	  case 0:
115	      break;
116	}
117	*file = (char *)++s;	/* XXX discard const */
118    }
119    /* no device present */
120    else
121	*file = (char *)fname;	/* XXX discard const */
122
123    return 0;
124
125baddev:
126    return ENXIO;
127}
128
129int
130devopen(struct open_file *f, const char *fname, char **file)
131{
132    int error;
133    int dev;
134    char count, lun, part;
135    struct devsw *dp;
136
137    dev   = 0;	/* default device is first in table (usually scsi disk) */
138    count = 0;
139    lun   = 0;
140    part  = 0;
141
142    if ((error = devparse(fname, &dev, &count, &lun, &part, file)) != 0)
143	return error;
144
145    dp = &devsw[dev];
146
147    if ((void *)dp->dv_open == (void *)nodev)
148	return ENXIO;
149
150    f->f_dev = dp;
151
152    if ((error = (*dp->dv_open)(f, count, lun, part)) != 0)
153	printf("%s(%d,%d,%d): %d = %s\n", devsw[dev].dv_name,
154	       count, lun, part, error, strerror(error));
155
156    return error;
157}
158