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
35 int devlookup(const char *, int);
36 int devparse(const char *, int *, int *, int *, int *, char **);
37
38 int
devlookup(const char * d,int len)39 devlookup(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 */
65 int
devparse(const char * fname,int * dev,int * count,int * lun,int * part,char ** file)66 devparse(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
114 baddev:
115 return ENXIO;
116 }
117
118 int
devopen(struct open_file * f,const char * fname,char ** file)119 devopen(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