1 /* $OpenBSD: devopen.c,v 1.5 2011/06/05 21:49:36 miod Exp $ */
2 /* $NetBSD: devopen.c,v 1.3 1997/04/06 08:41:25 cgd Exp $ */
3
4 /*-
5 * Copyright (c) 1992, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Ralph Campbell.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * @(#)devopen.c 8.1 (Berkeley) 6/10/93
36 */
37
38 #include <lib/libsa/stand.h>
39
40 /*
41 * Decode the string 'fname', open the device and return the remaining
42 * file name if any.
43 */
44 int
devopen(f,fname,file)45 devopen(f, fname, file)
46 struct open_file *f;
47 const char *fname;
48 char **file; /* out */
49 {
50 register char *cp;
51 register char *ncp;
52 register struct devsw *dp;
53 #if 0
54 register int c, i;
55 #endif
56 int ctlr = 0, unit = 0, part = 0;
57 char namebuf[20];
58 int rc;
59
60 cp = (char *)fname;
61 ncp = namebuf;
62
63 #if 0
64 /* look for a string like '5/rz0/vmunix' or '5/rz3f/vmunix */
65 if ((c = *cp) >= '0' && c <= '9') {
66 ctlr = c - '0';
67 /* skip the '/' */
68 if (*++cp != '/')
69 return (ENXIO);
70 cp++;
71 while ((c = *cp) != '\0') {
72 if (c == '/')
73 break;
74 if (c >= '0' && c <= '9') {
75 /* read unit number */
76 unit = c - '0';
77
78 /* look for a partition */
79 if ((c = *++cp) >= 'a' && c <= 'h') {
80 part = c - 'a';
81 c = *++cp;
82 }
83 if (c != '/')
84 return (ENXIO);
85 break;
86 }
87 if (ncp < namebuf + sizeof(namebuf) - 1)
88 *ncp++ = c;
89 cp++;
90 }
91 *ncp = '\0';
92 } else if (strchr(cp, '(')) {
93 /* expect a string like 'rz(0,0,0)vmunix' */
94 while ((c = *cp) != '\0') {
95 if (c == '(') {
96 cp++;
97 break;
98 }
99 if (ncp < namebuf + sizeof(namebuf) - 1)
100 *ncp++ = c;
101 cp++;
102 }
103
104 /* get controller number */
105 if ((c = *cp) >= '0' && c <= '9') {
106 ctlr = c - '0';
107 c = *++cp;
108 }
109
110 if (c == ',') {
111 /* get SCSI device number */
112 if ((c = *++cp) >= '0' && c <= '9') {
113 unit = c - '0';
114 c = *++cp;
115 }
116
117 if (c == ',') {
118 /* get partition number */
119 if ((c = *++cp) >= '0' && c <= '9') {
120 part = c - '0';
121 c = *++cp;
122 }
123 }
124 }
125 if (c != ')')
126 return (ENXIO);
127 cp++;
128 *ncp = '\0';
129 } else {
130 #endif
131 dp = devsw;
132 ctlr = unit = part = 0;
133 goto fnd;
134 #if 0
135 }
136
137 for (dp = devsw, i = 0; i < ndevs; dp++, i++)
138 if (dp->dv_name && strcmp(namebuf, dp->dv_name) == 0)
139 goto fnd;
140 printf("Unknown device '%s'\nKnown devices are:", namebuf);
141 for (dp = devsw, i = 0; i < ndevs; dp++, i++)
142 if (dp->dv_name)
143 printf(" %s", dp->dv_name);
144 printf("\n");
145 return (ENXIO);
146 #endif
147
148 fnd:
149 rc = (dp->dv_open)(f, ctlr, unit, part);
150 if (rc)
151 return (rc);
152
153 f->f_dev = dp;
154 if (file && *cp != '\0')
155 *file = cp;
156 return (0);
157 }
158