1 /* $OpenBSD: devopen.c,v 1.9 2023/01/16 07:29:35 deraadt Exp $ */
2 /* $NetBSD: devopen.c,v 1.1 1995/11/23 02:39:37 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 register int c, i;
54 int ctlr = 0, unit = 0, part = 0;
55 char namebuf[20];
56 int rc;
57
58 cp = (char *)fname;
59 ncp = namebuf;
60
61 /* look for a string like 'disk(0,0,0)bsd' */
62 if (strchr(cp, '(')) {
63 while ((c = *cp) != '\0') {
64 if (c == '(') {
65 cp++;
66 break;
67 }
68 if (ncp < namebuf + sizeof(namebuf) - 1)
69 *ncp++ = c;
70 cp++;
71 }
72
73 /* get controller number */
74 if ((c = *cp) >= '0' && c <= '9') {
75 ctlr = c - '0';
76 c = *++cp;
77 }
78
79 if (c == ',') {
80 /* get SCSI device number */
81 if ((c = *++cp) >= '0' && c <= '9') {
82 unit = c - '0';
83 c = *++cp;
84 }
85
86 if (c == ',') {
87 /* get partition number */
88 if ((c = *++cp) >= '0' && c <= '9') {
89 part = c - '0';
90 c = *++cp;
91 }
92 }
93 }
94 if (c != ')')
95 goto defdev;
96 cp++;
97 *ncp = '\0';
98 } else {
99 defdev:
100 /* No valid device specification */
101 cp = (char *)fname;
102 ncp = namebuf;
103 dp = devsw;
104 ctlr = unit = part = 0;
105 goto fnd;
106 }
107
108 for (dp = devsw, i = 0; i < ndevs; dp++, i++)
109 if (dp->dv_name && strcmp(namebuf, dp->dv_name) == 0)
110 goto fnd;
111 printf("Unknown device '%s'\nKnown devices are:", namebuf);
112 for (dp = devsw, i = 0; i < ndevs; dp++, i++)
113 if (dp->dv_name)
114 printf(" %s", dp->dv_name);
115 printf("\n");
116 return (ENXIO);
117
118 fnd:
119 rc = (dp->dv_open)(f, ctlr, unit, part);
120 if (rc)
121 return (rc);
122
123 f->f_dev = dp;
124 if (file && *cp != '\0')
125 *file = cp;
126 return (0);
127 }
128