1 /* $NetBSD: devopen.c,v 1.6 2009/03/14 21:04:12 dsl Exp $ */
2
3 /*-
4 * Copyright (c) 1992, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Ralph Campbell.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * @(#)devopen.c 8.1 (Berkeley) 6/10/93
35 */
36
37 #include <lib/libsa/stand.h>
38 #include <lib/libkern/libkern.h>
39
40 /*
41 * Decode the string 'fname', open the device and return the remaining
42 * file name if any.
43 */
44 int
devopen(struct open_file * f,const char * fname,char ** file)45 devopen(struct open_file *f, const char *fname, char **file)
46 /* file: out */
47 {
48 int ctlr = 0, unit = 0, part = 0;
49 int c, rc;
50 char namebuf[20];
51 const char *cp;
52 char *ncp;
53 #if !defined(LIBSA_SINGLE_DEVICE)
54 int i;
55 struct devsw *dp;
56 #endif
57
58 cp = fname;
59 ncp = namebuf;
60
61 /* expect a string like 'dksd(0,0,0)netbsd' */
62 while ((c = *cp) != '\0') {
63 if (c == '(') {
64 cp++;
65 break;
66 }
67 if (ncp < namebuf + sizeof(namebuf) - 1)
68 *ncp++ = c;
69 cp++;
70 }
71
72 /* get controller number */
73 if ((c = *cp) >= '0' && c <= '9') {
74 ctlr = c - '0';
75 c = *++cp;
76 }
77
78 if (c == ',') {
79 /* get SCSI device number */
80 if ((c = *++cp) >= '0' && c <= '9') {
81 unit = c - '0';
82 c = *++cp;
83 }
84
85 if (c == ',') {
86 /* get partition number */
87 if ((c = *++cp) >= '0' && c <= '9') {
88 part = c - '0';
89 /* dksd(,,8)boot -> dksd(,,) */
90 if (part >= 8)
91 part = 0;
92 c = *++cp;
93 }
94 }
95 }
96 if (c != ')')
97 return (ENXIO);
98 cp++;
99
100 *ncp = '\0';
101
102 #ifdef LIBSA_SINGLE_DEVICE
103 rc = DEV_OPEN(dp)(f, ctlr, unit, part);
104 #else /* !LIBSA_SINGLE_DEVICE */
105 for (dp = devsw, i = 0; i < ndevs; dp++, i++)
106 if (dp->dv_name && strcmp(namebuf, dp->dv_name) == 0)
107 goto fnd;
108 printf("Unknown device '%s'\nKnown devices are:", namebuf);
109 for (dp = devsw, i = 0; i < ndevs; dp++, i++)
110 if (dp->dv_name)
111 printf(" %s", dp->dv_name);
112 printf("\n");
113 return (ENXIO);
114
115 fnd:
116 #ifdef BOOTNET
117 if (strcmp(namebuf, "tftp") == 0)
118 rc = (dp->dv_open)(f, namebuf);
119 else
120 #endif /* BOOTNET */
121 rc = (dp->dv_open)(f, ctlr, unit, part);
122 #endif /* !LIBSA_SINGLE_DEVICE */
123 if (rc)
124 return (rc);
125
126 #ifndef LIBSA_SINGLE_DEVICE
127 f->f_dev = dp;
128 #endif
129 if (file && *cp != '\0')
130 *file = (char *)cp; /* XXX */
131 return (0);
132 }
133