1 /* $NetBSD: devopen.c,v 1.9 2013/11/03 00:59:03 christos 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
39 /*
40 * Decode the string 'fname', open the device and return the remaining
41 * file name if any.
42 */
43 int
devopen(struct open_file * f,const char * fname,char ** file)44 devopen(struct open_file *f, const char *fname, char **file)
45 /* file: out */
46 {
47 register char *cp;
48 register struct devsw *dp;
49 #if 0
50 register char *ncp;
51 register int c, i;
52 char namebuf[20];
53 #endif
54 int ctlr = 0, unit = 0, part = 0;
55 int rc;
56
57 cp = (char *)fname;
58
59 #if 0
60 ncp = namebuf;
61 /* look for a string like '5/rz0/vmunix' or '5/rz3f/vmunix */
62 if ((c = *cp) >= '0' && c <= '9') {
63 ctlr = c - '0';
64 /* skip the '/' */
65 if (*++cp != '/')
66 return (ENXIO);
67 cp++;
68 while ((c = *cp) != '\0') {
69 if (c == '/')
70 break;
71 if (c >= '0' && c <= '9') {
72 /* read unit number */
73 unit = c - '0';
74
75 /* look for a partition */
76 if ((c = *++cp) >= 'a' && c <= 'h') {
77 part = c - 'a';
78 c = *++cp;
79 }
80 if (c != '/')
81 return (ENXIO);
82 break;
83 }
84 if (ncp < namebuf + sizeof(namebuf) - 1)
85 *ncp++ = c;
86 cp++;
87 }
88 *ncp = '\0';
89 /*
90 * XXX
91 * pulling strchr from the C library, should pull from libkern.
92 */
93 } else if (strchr(cp, '(')) {
94 /* expect a string like 'rz(0,0,0)vmunix' */
95 while ((c = *cp) != '\0') {
96 if (c == '(') {
97 cp++;
98 break;
99 }
100 if (ncp < namebuf + sizeof(namebuf) - 1)
101 *ncp++ = c;
102 cp++;
103 }
104
105 /* get controller number */
106 if ((c = *cp) >= '0' && c <= '9') {
107 ctlr = c - '0';
108 c = *++cp;
109 }
110
111 if (c == ',') {
112 /* get SCSI device number */
113 if ((c = *++cp) >= '0' && c <= '9') {
114 unit = c - '0';
115 c = *++cp;
116 }
117
118 if (c == ',') {
119 /* get partition number */
120 if ((c = *++cp) >= '0' && c <= '9') {
121 part = c - '0';
122 c = *++cp;
123 }
124 }
125 }
126 if (c != ')')
127 return (ENXIO);
128 cp++;
129 *ncp = '\0';
130 } else {
131 #endif
132 dp = devsw;
133 ctlr = unit = part = 0;
134 goto fnd;
135 #if 0
136 }
137
138 for (dp = devsw, i = 0; i < ndevs; dp++, i++)
139 if (dp->dv_name && strcmp(namebuf, dp->dv_name) == 0)
140 goto fnd;
141 printf("Unknown device '%s'\nKnown devices are:", namebuf);
142 for (dp = devsw, i = 0; i < ndevs; dp++, i++)
143 if (dp->dv_name)
144 printf(" %s", dp->dv_name);
145 printf("\n");
146 return (ENXIO);
147 #endif
148
149 fnd:
150 rc = (dp->dv_open)(f, ctlr, unit, part);
151 if (rc)
152 return (rc);
153
154 f->f_dev = dp;
155 if (file && *cp != '\0')
156 *file = cp;
157 return (0);
158 }
159